bluuebunny/crossref_metadata_2025 huggingface dataset:
MT Literacy—A cognitive view
Authors: O’Brien Sharon , Ehrensberger-Dow Maureen
Published: August 2020

MT literacy means knowing how MT works, how the technology can be useful in a particular context, and what the implications are of using it for various purposes. As MT usage grows, the necessity for MT literacy also grows. This knowledge forms part of the greater need for digital literacies. In this contribution, we relate MT literacy to the concept of cognitive load in professional translation production and in translator training scenarios. We then move beyond the sphere of translation studies to examine other use-case settings—crisis communication, academic writing and patent publishing—to consider how MT can offer solutions and how MT literacy can impact cognitively in those settings. We discuss how training in MT literacy can empower language professionals and present two proposals for course content designed for MT users in other sectors.
Cognitive load in relation to non-standard language input
Authors: Albl-Mikasa Michaela , Ehrensberger-Dow Maureen , Hunziker Heeb Andrea , Lehr Caroline , Boos Michael , Kobi Matthias , Jäncke Lutz , Elmer Stefan
Published: August 2020

The linguistic, psycholinguistic, and neural processes underlying simultaneous interpreting and translation have attracted
widespread interest in the research community. However, an understanding of the cognitive load associated with these bilingual activities is
just starting to emerge, and the underlying behavioral and physiological mechanisms are still poorly understood. In this article, we
describe a promising interdisciplinary approach to assess the behavioral and physiological indices of cognitive load during interpreting
and translation in laboratory and simulated workplace settings. In this context, we emphasize the importance of ecological validity and
explain how comparisons between authentic non-standard input and edited English versions of the same stimuli can be used to evaluate
cognitive load while controlling for the general cognitive demands associated with interpreting and translation. The perspective we present
in this article might pave the way for a clearer understanding of the multifaceted dimensions of cognitive load during simultaneous
interpreting and translation as well as during the processing of English as Lingua Franca.
The interpreter’s aging
Authors: Liu Minhua , Kurz Ingrid , Moser-Mercer Barbara , Shlesinger Miriam
Published: August 2020

This article reports part of the first phase of the AIIC Lifespan Study, for which ten conference interpreters
over 70 years old were interviewed to learn how interpreters’ professional language experiences interact with their cognitive
functions and, specifically, if they demonstrate different patterns of cognitive decline regarding language use. The interview
transcripts were coded to identify examples that matched the items in the research-informed interview guide or any emerging
patterns that informed the theme of cognitive changes. The interview­ees experienced some aging-induced cognitive challenges, such
as comprehension difficulties in less than optimal environments, concentration and memory issues, and slowness in lexical
retrieval. Some of these challenges had an impact on some interview­ees’ decision to quit interpreting.
Broadening the social psychological approach to acculturation: cultural, personality and social-network approaches (Ampliación del enfoque socio-psicológico de la aculturación: perspectivas cultural, de la personalidad y de las redes sociales)
Authors: Benet-Martínez Verónica , Repke Lydia
Published: August 2020

The field of acculturation spans a rich and broad spectrum of relevant topics, types of populations and geographic areas. It has, however, been slow in incorporating theoretical insights beyond the intergroup relations perspective, neglecting contributions from other social psychology areas, such as the socio-cognitive approach, and from disciplines such as cultural and personality psychology, and the social-network perspective. The main aim of this article is to inform and broaden the understanding of micro- and meso-level acculturation mechanisms (e.g., cultural frame switching, multicultural identity structure and dynamics, intra- and inter-personal interculturality). We argue that it is time for acculturation research to apply other methodologies, rely on new theoretical paradigms and move from predicting acculturation outcomes (e.g., psychological well-being) to modelling acculturation processes. The article closes with a discussion on potential future challenges and needed directions in the social psychological study of acculturation, interculturalism and migration.
Effect of electropulsing on the precipitation of NbCxN1−x from austenite phase
Authors: Zhu Zhenghai , Dong Hongbiao , Zhou Li , Zhang Ke , Wang Haijun , Chang Lizhong , He Fei , Jia Tao
Published: August 2020

The precipitation of NbC xN1− x significantly affects the high-temperature mechanical properties of Nb microalloyed steel. The control of the precipitation behaviour of NbC xN1− x is the key, especially the nucleation and precipitation from Nb solid solution. We explore to use electropulsing to promote the precipitation of NbC xN1− x through thermodynamic model, chemical phase analysis, XRD and TEM. The modelling research show that electropulsing intensity significantly promotes the nucleation of NbC xN1− x in austenite phase. The higher the electropulsing temperature is, the better the promotion effect is. The chemical phase analysis and XRD investigation results show that electropulsing can increase the amount of precipitation of NbC xN1− x by 50% at 950°C compared to the precipitation without electropulsing.
The association between smoking and dizziness in U.S. adults
Authors: Formeister Eric J. , Sharon Jeffrey D.
Published: August 2020

Objective

Smoking is a risk factor for several conditions associated with dizziness, such as cardiovascular disease and emphysema. However, little is known about the specific association between smoking and dizziness. The purpose of this study was to examine the relationship between smoking and dizziness in the U.S. adult population.

Methods

Responses from the 2008 National Health Interview Survey of U.S. adults (n = 21,781) were used to identify risk factors for dizziness and smoking.

Results

Of the 21,781 adults in the survey, 41.8% smoked more than 100 cigarettes in their lifetime. Of the 2,490 adults who had a self-diagnosed problem with dizziness, 54.1% had smoked more than 100 cigarettes in their lifetime. This corresponded to an odds ratio of 1.72 (95% CI, 1.56–1.89; p < .001) for experiencing dizziness with a history of smoking. In a multivariate analysis that included prior lung disease, cardiovascular disease, diabetes, hypertension, prior stroke, head trauma, age, sex, anxiety, depression, and history of migraines, smoking remained a significant risk factor for dizziness (OR 1.30; 95% CI, 1.17–1.46; p < .001).

Conclusion

In a representative nationwide survey of U.S. adults, smoking is independently associated with dizziness, even after controlling for demographic variables, known risk factors for dizziness, and smoking related diseases.
Value of saccadic latency as a diagnostic tool for multiple sclerosis
Authors: Hamdy M. , Sherif H. , Ibrahim I.
Published: August 2020

Background

Multiple sclerosis (MS) is a chronic and progressive autoimmune disorder that affects the Central Nervous System (CNS). MS is a clinical diagnosis that is confirmed by MRI, visual evoked potentials, and CSF examination.

The objective of the current review and meta-analysis is to evaluate the value of saccadic eye movement abnormalities – particularly saccadic latency – as a diagnostic tool for Multiple Sclerosis.

Methods

We searched the literature in MEDLINE, PubMed, Web of Science and Cochrane Library from 1st January 1998, through 1st September 2018. Published studies of adult patients who are diagnosed with MS and had VOR testing including saccadic eye movement test, and reporting saccadic latency. We calculated pooled mean differences (MD) and 95% confidence intervals (CI) using a random-effects model for latencies in milliseconds (ms) between MS patients and normal controls. The considerable heterogeneity decided the effect model.

Results

Five studies met all inclusion criteria. MS patients had a significantly longer saccadic latency compared to the control group, with 135 MS cases and 126 controls, were included in this meta-analysis. The results indicated that there is a significant increase in saccadic latency in the MS group (MD = 31.99, 95% CI = 14.08, 49.90, p = .0005).

Conclusion

Based on current evidence from published studies, Saccadic latency can serve as a diagnostic tool to support the clinical diagnosis of MS.
Squeeze excitation densely connected residual convolutional networks for specific emitter identification based on measured signals
Authors: Wan Zining , Zeng Deguo , Wang Wenhai , Chen Xinwei , Zhang Zeyin , Xu Fuyuan , Mao Xuanyu , Liu Xinggao
Published: August 2020

Specific emitter identification (SEI) refers to the process of distinguishing emitter individuals, which is important for electric support measure systems. Traditional SEI methods are based on hand-crafted features and have the problem of low accuracy. A novel convolutional neural network (CNN) approach, named squeeze excitation densely connected residual convolutional network (SEDCRN) approach, is therefore proposed. SEDCRN can directly recognize signals without complex preprocessing. It obtains the beneficial advantage of rediscovering new, more useful new features from low-level information and reducing feature redundancy by embedding the squeeze excitation module and residual connections into the densely connected convolutional structure. BesideIn addition, SEDCRN adopts center loss as an auxiliary loss function, which can further enhance the ability of feature learning and expression, especially for SEI tasks. The proposed approach is evaluated using a real automatic, dependent surveillance-broadcast signal dataset. Experiments show that SEDCRN outperforms traditional methods and other CNN-based methods in terms of accuracy and parameter efficiency.
Photoresponse of CdSe-PVA nanocomposite films at low magnetic fields
Authors: Pokhriyal S , Biswas S
Published: August 2020

A set of nanocomposite films of poly-vinyl alcohol (PVA) and 0.1–0.4 wt% CdSe nanoparticles (NPs) were developed by spin coating and their surface resistance (R) was measured as a function of light illumination intensity (IL
) and applied magnetic field (H). The ferromagnetic CdSe NPs were synthesized by a facile chemical method which ensured in situ surface stabilization with a skinny layer of graphitic carbon. The CdSe NPs were uniformly dispersed in an aqueous solution of 2.0 wt% PVA and spin-coated on fluorine-doped tin oxide coated glass substrates. The photoresponse of the nanocomposite films at low H exhibits their efficacy for pertinent applications in optoelectronics.
Fractal structure of Yang-mills fields
Authors: Deppman Airton , Megías Eugenio , Menezes Débora P
Published: August 2020

The origin of non-extensive thermodynamics in physical systems has been under intense debate for the last decades. Recent results indicate a connection between non-extensive statistics and thermofractals. After reviewing this connection, we analyze how scaling properties of Yang-Mills theory allow the appearance of self-similar structures in gauge fields. The presence of such structures, which actually behave as fractals, allows for recurrent non-perturbative calculations of vertices. It is argued that when a statistical approach is used, the non-extensive statistics is obtained, and the Tsallis entropic index, q, is deduced in terms of the field theory parameters. The results are applied to QCD in the one-loop approximation, resulting in a good agreement with the value of q obtained experimentally.
Tetraquark candidates in LHCb's di-J/ψ mass spectrum *
Authors: Wang Zhi-Gang
Published: August 2020

In this article, we study the first radial excited states of the scalar, axialvector, vector, and tensor diquark-antidiquark-type

tetraquark states with the QCD sum rules and obtain the masses and pole residues; then, we use the Regge trajectories to obtain the masses of the second radial excited states. The predicted masses support assigning the broad structure from 6.2 to 6.8 GeV in the di-

mass spectrum to be the first radial excited state of the scalar, axialvector, vector, or tensor

tetraquark state, as well as assigning the narrow structure at about 6.9 GeV in the di-

mass spectrum to be the second radial excited state of the scalar or axialvector

tetraquark state.
Features Method for Selecting VMD Parameters based on Spectrum without Modal Overlap
Authors: Yun Xing , Jian Rong
Published: August 2020

Variation Mode Decomposition (VMD) can decompose a complex set of signals into the form of a sum of multiple amplitude modulated FM eigenmode functions (IMFs). Compared with EMD decomposition, the VMD method has a strict mathematical model foundation, which further avoids modal overlap and has higher computational efficiency. Therefore, VMD has been widely used in engineering. Different from the adaptive decomposition of the signal by EMD, the VMD method needs to preset mode parameter K and the second penalty factor α in the VMD decomposition before decomposing the signals. In the case of reasonable parameter setting, VMD method shows better robustness, otherwise it will greatly affect the accuracy of decomposition results. In this paper, the influence of the two parameters on the decomposition effect is discussed by combining the correlation coefficient, kurtosis index and spectrum graph. Based on the problem that these two important parameters are difficult to select, a constraint rule and screening strategy without modal overlap is proposed. According to the parameter selection strategy, mode parameter K and the second penalty factor α are automatically selected to ensure that modal overlap does not occur, Signal decomposition shall be as detailed and accurate as possible. By decomposing the bearing data, the rationality of the parameter selection strategy is proved. A new idea is put forward for the research of VMD.
Design of Saddle-Type Seam Welding Gun Posture Adaptive Actuating Mechanism
Authors: Yong Wang , An-gen Bian , Lei Wang
Published: August 2020

The two pipes are connected orthogonally to form a saddle-shaped intersecting line. The welding device uses a double-cam compound motion mechanism to achieve automatic welding of saddle-shaped curved seams. The small cam is used to control the up and down movement of the welding torch to track the seam trajectory, and the large cam is used to control the welding torch head and the welding point. A reasonable welding angle is maintained by the normal plane. For the cams of the key components of the above device, this article uses a three-dimensional CAD modeling design of the tube and tube orthogonal to obtain a saddle-shaped intersection line, obtain a certain number of discrete point coordinates on this space curve, and inversely obtain its contour by applying the principle of inversion.
Evaluation of crack growth stage of sapphire under scratching based on AE signals
Authors: Gu Xingshi , Zhao Qingliang , Guo Bing
Published: August 2020

For hard-brittle materials, crack initiation and growth is an important factor to determine the surface quality of components during machining process. In this paper, the crack growth stage of sapphire was investigated based on acoustic emission (AE) signals through single-grit scratch experiments. The AE waveform indexes, i.e. fractal and frequency characteristics, were fully analyzed and correlated with groove microstructure of specimen after tests. The research shows that the specimen undergo four stages of crack growth successively as scratch depth increasing. It is found that the fractal dimension (FD) and frequency characteristics of AE signals are distinctive to various damage behaviors and be used to evaluate crack growth stage induced in machining process effectively. Especially, the FD distribution is sensitive to the occurrences of the critical damages and removal modes resulting from crack growth in scratch procedure. This paper can shed light on the control of surface integrity and subsurface damage of hard-brittle materials in ultra-precision manufacturing.
3D Simulation of acoustic waves propagating through porous domain using PUFEM tetrahedral elements
Authors: Yang Mingming , Breard Cyrille , Cen Yipeng , Chazot Jean-Daniel
Published: August 2020

Partition of Unity Finite Element Method is one of the new deterministic prediction techniques developed for tackling medium and high frequency wave problems, because it has the overwhelming advantage over traditional Finite Element Method due to its high efficiency and low computational cost properties. In this paper, PUFEM is further developed to simulate the 3D sound pressure field where porous material is included and modeled as an equivalent homogeneous fluid. Lagrange multipliers are applied at the air and porous material interface. The performance and efficiency of the established numerical model using 3D PUFEM elements are analyzed, it is shown that PUFEM technique can effectively reduce the computational burden while still maintaining the sufficient accuracy for the simulation results of 3D acoustic problems.
A Fault Diagnosis Model Based On Full Vector Spectrum And Feature Engineering
Authors: Cui Huanting , Chen Hong , Xiao Sa
Published: August 2020

Aiming at the problem of how to quickly and accurately diagnose different types of rotating machinery faults, this paper starts with the combination of full-vector spectrum theory and feature engineering. A model of rotor imbalance faults diagnosis and identifying is constructed in the process of dealing with the data sets of multiple rotor imbalance fault. The result shows that this fault diagnosis model combined with the full vector spectrum theory and feature engineering can be used to correctly distinguish the faults of the equipment and accurately identify the types of the unbalanced faults.
Research on New Automotive Electronic Hydraulic Brake System
Authors: Chen Liang , Chi Hua , Feng Yue , Zhang ChuanMin
Published: August 2020

The new structure of EHB replaces part of the mechanical transmission by electronic control, brake pedal is not connected with brake wheel cylinder directly. While braking, ECU collect the sensor signal of brake pedal as the driver’s intention. It solves the problems caused by traditional hydraulic braking system, and also makes up for deficiencies caused by the traditional braking system design and principle. The EHB system can make brake control gets the maximum control margin, which can improve the efficiency and braking safety.
Target Detection and Correction of Micro-motor Rotor Based on HALCON
Authors: jian Wang , lai Wei , xiao-ning Chen
Published: August 2020

In order to realize the high-speed and accurate inspection and correction of the micro-motor rotor during its soldering process, an identification and measurement system based on HALCON was designed. It realizes such functions as collecting, identifying and filtering images, analyzing target deviations and correcting them. Firstly, the industrial camera is used to obtain the target image. Then the image is preprocessed, after NCC template matching, ROI extraction and feature segmentation, the accurate target features are obtained. Finally, the center coordinates of the feature area are obtained to calculate the feature position deviation, and then the upper computer controls device to correct the deviation. The results show that the system can replace the manual detection to complete features recognition and correction of the target rotor and it also improves its efficiency and accuracy of the recognition and correction, providing a new method for the recognition and correction of motors in actual production.
Control Method Based On Long Time-delay System
Authors: Huang Ling , Tang Rui , Xia Pei , Tan Cheng
Published: August 2020

In today’s industrial control field, the control system often has long time-delay property, which makes the sensor unable to acquire real-time information and the control system difficult to control. A control method is proposed here, on the one hand, which uses Fuzzy-PID control to adjust control parameters in real time, improves control accuracy and strengthen the robustness of the control system; On the other hand, this method uses particle swarm algorithm to calculate the optimal fuzzy control parameters to make the system in the optimal control state, and at the same time, uses Smith algorithm to overcome the system delay. Finally, through the simulation, This control strategy has higher precision than traditional PID control, and has a shorter reflection time, which achieves precise control of systems for long time-delay system.
Research on Error Analysis and Online Recognition Method of Contour in 3D Printing
Authors: Lianghua Zeng
Published: August 2020

The accuracy of 3D printing is related to the software and hardware structure, such as modeling software, slicing software and the kinematic characteristics of nozzle components. In order to explore methods to improve printing accuracy, this paper conducts research based on fused deposition modeling (FDM). On the basis of the experiments, the constituent elements of the cross-sectional profile and the mechanism of its error are analyzed, and the insight software is used to verify. Finally, based on the idea of digital twins, this paper initially explores the online recognition method of contour.
The remote control research based on the Android platform
Authors: Meihui Xu , Yaqi Wang , Xiye Feng , Ling Zhang , Longxi Xu , Guixian Shi
Published: August 2020

With the rapid development of mobile terminals and wireless networks, the relationships between computers and mobile phones are more and more closely. Now, the mobile phones and computer become indispensable to modern society in the daily life. The information transmission and exchange between them has become increasingly frequent. The purpose of this research is to find a safe way of connection with low cost, low power consumption, convenient and flexible, so that we can finish the information exchange quickly and accurately between mobile phone and computer. Because of using a socket connection mode, the physical line media is not needed.
A Monitoring and Reseeding Device for Potato Sower
Authors: Shufeng Liu , Zhaoqin Lv , Guangling Zhang , Hanxiang Wang
Published: August 2020

To solve the problem of artificial detection and replanting in a potato planter, we provide laser sensor-based seeding detection method. In addition, this paper adopts a method for the detection of seeding by designing a monitoring and reseeding device for a potato sower. We also test the performance of the seeding detection and the automatic filling performance of the device. The device adopts the two pairs of laser correlation sensor and contact-travel switch sensor to detect the leak air scoop seeding location. To achieve precise seeding, the proposed device relies on the step motor to drive the seeding device. The experimental result shows that when the working speed is 2–5 km/h, the original average seeding rate of the seeding machine is 91.35%, the average successful replanting rate of the replanting device is 82.17%, and the comprehensive seeding rate is less than 1.5%. In addition, the total seeding rate is 98.5%. The seeding rate and the seepage rate obviously decreased when the line speed is less than 0.5 m/s. The method for seeding detection proved to be accurate, and the effect of the automatic seeding device is highly apparent. The method not only adapts to different sowing speeds and potato sizes, but also provides a theoretical basis for the intelligent design of a potato planter.
Application of Fuzzy Analytic Hierarchy Process in Intelligent Manufacturing Resources Allocation Evaluation System of Alliance Enterprises
Authors: Wang Yunxia , Li Guangrong , Chen Jian , Zhang Zihao
Published: August 2020

With the increasing global competition, more and more enterprises form the industrial alliance. In order to solve the problem of resource allocation and scheduling optimization of industrial alliance enterprises in intelligent manufacturing environment, an efficient resource allocation method and evaluation index of industrial alliance service platform are established. A set of systematic intelligent manufacturing resources evaluation scheme is established by using FAHP, which can be used to evaluate and analyze several manufacturing resources conveniently. According to different needs of customers, the weight assignment is also changing, and the most suitable manufacturing resources can be obtained.
Research on Evaluation System of Alliance Enterprises in Intelligent Manufacturing Environment Based on BP Neural Network
Authors: Xiao Guiping , Wang Yunxia , Ni Ping , Chen Di , Zhang Zihao
Published: August 2020

In an intelligent manufacturing environment, fierce global market competition has made more and more companies form industrial alliances to gain an advantage. The basic goal of enterprise alliance is achieving high efficiency and a win-win situation. This paper mainly studies the necessity of partner selection, determines the principle of partner selection, and establishes an evaluation index system for dynamic alliance enterprise cooperation. At the same time, multi-attribute decision analysis and BP neural network are used to identify the ultimate partner. Finally, an example is analyzed with MATLAB to verify its feasibility.
Serial and parallel reliability models for robot arm reliability analysis
Authors: Li Songhao , Xu Chen , Wang Yawen , Xie Liyang
Published: August 2020

For reliability evaluation of a robot arm designed for tunnel boring machine, a serial system reliability model for arm strength and a summation (cumulative deformation) system reliability model for the fingers of the robot arm are developed. To reflect the effect of load uncertainty, total probability theorem is applied to develop mult-layer, multi-variate reliability models. With the total probability theorem and the multi-layer configuration of the reliability models, such models reflect the effect of load intensity uncertainty, load action number uncertainty, load peak distribution uncertainty, and component strength uncertainty hierarchically.
Design of AGV Automatic Navigation System Based on Baidu Static Map
Authors: Jiang Ling-yun
Published: August 2020

In order to solve the problem of “the last kilometer” of heavy load logistics, an AGV automatic navigation system based on Baidu static map for path planning was developed. The upper computer program was designed to collect Baidu static map images as the base map of the electronic map. Path planning was conducted on the base map to generate trajectory data in byte form, which was sent to the data register area of PLC through Modbus RTU protocol. According to the data transmitted by the upper computer and sensor fusion technology, the PLC program realizes AGV positioning and automatic cruise. Replacing hardware with software to expand AGV functions is a low-cost and highly reliable alternative to current unmanned driving technology, which has certain innovation and practicability.
Research on jet impingement cooling based on serial wedge-shaped wettability patterned surface
Authors: Zhang Heng , Liu Ziai , Song Jinlong
Published: August 2020

Jet impingement cooling technology has been widely used in many engineering fields. However, the flow direction of the water jet on uniform surface at high temperature is uncertain, thus the cooling efficiency using this technology is limited. Here, a serial wedge-shaped wettability patterned surface is fabricated on the aluminum sample to guide the water flow direction. During the water transportation on the patterned surface, the Laplace force is the main driving force. In this study, the cooling characteristics of water jet with different flow rates and initial temperatures are studied by the temperature data obtained according to thermocouples and multiplex temperature meter. Results show that both the center and edge positions of the sample possess excellent cooling efficiency. Additionally, we find that a better cooling effect can be observed when a larger flow rate of water jet was injected on the surface with a higher initial temperature.
Experimental study on cutting speed and surface roughness of pure copper in WEDM
Authors: Li W M
Published: August 2020

Wire electrical discharge machining (WEDM) is an important way to manufacture copper electrode. In order to quickly manufacture copper electrode with good surface quality, the influence of electrical parameters on cutting speed and surface roughness of pure copper in wire electrical discharge machining was investigated. An analytical method was proposed to analyze the influence law from the aspects including discharge energy, the formation of adhesive substance on cutting surface and the discharge of electric erosion products. The results show that the pulse width has the greatest influence on the surface roughness and the peak current has the greatest influence on the cutting speed. Using the proposed analytical method, the influence relationship between the electrical parameters and the process objectives could be accurately analyzed, and then the actual production could be guided to select the appropriate electrical parameters according to the optimal process objectives pursued.
Study on testing vehicle’s driving wheel output power
Authors: Wang Fan
Published: August 2020

This paper describes the principle, test methods and test procedures of vehicle wheel power based on the chassis dynamometer, as well as analyzes the test methods and factors that affected the test results of the driving wheel rolling resistance. At the same time, through the analysis of the test data of several groups of real vehicles, some attempts have been made to explore practical and feasible methods for automobile power performance test under the current conditions in our country. The relevant conclusions can provide a reference for improving the level of automobile power performance test.
Mechanical scribing test analysis of lateral ridges law on aluminum
Authors: Ji Lu , Wang Xin , Shan Yan , Bai Xiaotao
Published: August 2020

In order to study the rule of lateral uplift of pure aluminum (purity is 99.999%) during mechanical scribing, based on the mechanical scribing test device, the tool tip angles are 80 °, 85 °, 90 °, 95 °, 100 ° The diamond cone cutter is used to perform mechanical scoring test on pure aluminum with a depth range of 5μm-25μm. Through the bump height detection analysis, lateral ridge height and groove depth - mathematical statistical relationship knife sharp corners, through the known parameters such as groove depth, groove on the bump height is pre-sentence, thereby pre-Groove play an important role in the control.
A local-optimizing surface reconstruction method based on point cloud data
Authors: Ma Jianwei , Liu Zhao , Li Jiawei , Du Wenhao , Qu Ziwen , Li Guanlin
Published: August 2020

Surface reconstruction based on discrete point cloud data is a frequently encountered problem in the field of CAD/CAGD and computer graphics. In this paper, a local-optimizing surface reconstruction method based on discrete point cloud data is proposed. Firstly, the moving least square method is used to fit the discrete point cloud data to generate a gridded point clouds. Then the global interpolation method is used to generate the initial NURBS surface based on the gridded point clouds. Additionally, the knots are inserted into the regions with excessive errors. Ultimately, a multi-objective optimization function is established to optimize the regions with excessive errors and their neighbourhoods simultaneously. Compared with the existing methods, the proposed method can improve the fitting accuracy of the reconstructed surface locally and has higher efficiency.
Analysis of Vibration Fatigue of A Subway Shunting Train
Authors: Fan Weipeng , Li Ronghua , Zhang Xiujuan , Tian Maopeng , Zhao Deyu
Published: August 2020

In order to research the fatigue life of a subway shunting train, the power spectrum density (PSD) is used to calculate the vibration fatigue based on frequency domain analysis. Through pre-stressed modal analysis in finite element simulation, the natural frequency and vibration mode are obtained. Then harmonic response is used to get the frequency response function (FRF) based on the modal superposition method. Then the solution is imported into Ncode Designlife. After using the Lalanne method to process PSD curve and the Goodman method to correct the mean stress of the estimated S-N curve, the vibration fatigue damage of the shunting train is obtained, so as to evaluate its vibration fatigue. The result will provide a certain theoretical basis for the fatigue study of shunting train.
Optimization analysis of parallel reed damper for optical sight
Authors: Guobiao Fei , Xingmei Cheng , Fenggang Liu
Published: August 2020

The parallel reed damper is very important for the optical sight to bear high-intensity impact, and its damping effect directly affects the firing accuracy of the weapon system. In this paper, based on the response surface methodology, the parametric modeling and finite element analysis of the parallel reed damper of the optical sight are carried out in the ANSYS Workbench. The response surface curve of the maximum displacement response to the structural parameters is obtained, and the influence rule of the structural parameters on the maximum displacement response is analyzed. The results show that the sensitive parameters of the parallel reed damper are the width of the reed, the height of the reed hollow layer, the thickness of the reed and the symmetrical distance of the reed. The results of the optimization analysis can be used to guide the structural design of the parallel reed damper of the optical sight and provide a favorable guarantee for improving the shooting accuracy of light weapons.
Effect of Connecting Link Deformation on Stability of Balance Hoist Based on Multi-body Dynamic
Authors: Hao Jie , Zhang Xuewei , Liu Yu , Sha Zhihua , Zhang Shengfang
Published: August 2020

Aiming at the instability problem of balance hoist in the loading process, this paper is to establish a dynamic simulation model of balance hoist by using ADAMS. Based on rigid-flexible coupling dynamics, flexible connecting link was modeled as Euler–Bernoulli beams. The stability and dynamic characteristics of two extreme working states were analyzed. The results showed that the vibration and elastic deformation of connecting link after loading have a great influence on the constraint force of each hinge and out-of-balance force, and caused slippage and instability of balance hoist, especially when the lifting weight of the balance hoist moved to the region around workspace. It can reduce the out-of-balance force and improve the stability of balance hoist to increase the stiffness of the connecting link properly, which will provide a better reference for the structure optimization and operational performance of balance hoist.
Development and Experiment Research on Multi-function Wire Rope for Manned Rescue Lifting Equipment
Authors: Qingxiu Liu
Published: August 2020

Starting from the introduction of the method of manned rescue lifting for deep hole with large diameter, a multi-function requirement was proposed for loading and communication transmission to develop a special wire rope for ZMK5200QJY40 rescue and lifting vehicle, and a built-in four-strand 4V × 39S non-rotating wire rope structure was established with the coal mines safety requirements. Through the combination of numerical calculation and experimental research, the specific parameters of the wire rope were calculated, the wire and the central cable material, the workshop production process were optimized, and a multi-function wire rope was trial-produced. Based on the failure tensile test, the wedge-shaped ring combination was preferred as the connection method between the wire rope and the lifting cabin, after a series of fatigue and insulation tests, actual working condition simulation tests, etc., a kind of wire rope with functions of manned lifting and communication has been successfully developed, the structure was reliable enough to ensure the safety of the manned rescue process, and it has a reference significance for the series of multi-functional wire ropes development.
The kinematic and dynamic characteristics and system optimization design of optical cable based on backtracking method
Authors: Lin Yongchi , Li Jie , Zheng Shouqiang , Shen Zhenzhu , Huang Weicheng , Song Jinling , Liang Fengshun , Gu Lizhi
Published: August 2020

Optical cable in modern communications is an important facility, and the laying of the optical cable is the key link in the installation. On the basis of analyzing the technological process and ensuring the requirements of optical cable laying, the kinematic parameters the tractor was first optimized and determined by the simplex method. analyzing the motion state and stress state of optical cable laying. E exponential function was selected as the movement mode of the cable to start and stop the cable. The kinematic characteristics of optical cable were programmed with the simplex method, and the optimal acceleration, uniform speed and deceleration distance were obtained corresponding to the three stages. Then the ideal parameters of cable cable’s velocity and acceleration were determined. According to this, the angular acceleration as well as other kinematic and dynamic characteristics of the roller slip roller was obtained ensuring these parameters being in coalescence with those of the tractor. The application study has shown that the system works well and meets the design expectation.
Structural Design and CFD Analysis of Engine Plastic Intake Manifold
Authors: Li Zhixiang , Li Xiaoyan
Published: August 2020

The quality of the intake manifold has a direct impact on the performance of the engine. Based on the characteristics of the cavity structure of the intake manifold, this paper designs a new three-dimensional cavity model of the intake manifolds. Then the author analyses the flow field of intake manifold, the flow velocity and pressure distribution and local pressure loss in the airway by using CFD fluid analysis software. The results show that the flow field inside the intake manifold is stable without obvious pressure loss area and no airflow wall separation phenomenon. Hence the resulting design could meet initial design requirements with improvement of power and economy of the engine.
An experiment of lubricating oil gas concentration in the standardized driving cycles
Authors: Lin J , Liu Y Q
Published: August 2020

There always is cavitation in the positive displacement pump, and the bubbles in the lubricating oil have a great influence on the lubricating performance. This paper aims to measure the lubricating oil gas concentration of a passenger car gasoline engine in the standardized driving cycles. We use a passenger car engine lubricating system in the lubricating experiment, simulating the lubricating oil pump working state in the standardized driving cycles. The lubricating oil density and flow rate are measured to calculate the gas concentration in the lubricating oil, according to the engine work state in the standardized driving cycles, including NEDC Urban, NEDC Ultra Urban, WLTC High Speed. The test results show that under the steady-state conditions, the gas volume ratio decreases linearly with the increase of the outlet pressure, the air mass ratio increases with the increase of the pump speed. In the driving cycles, the air mass ratio also increases with the increase of outlet pressure, and it has a high positive correlation with lubricating oil flow and pump speed. With the increase of oil temperature from 25 to 100°C, the air volume ratio decreases by 72.6%, and the air mass ratio decreases by 84.3%. In the engine accelerating state, the rate of lubricating oil flow gain lags behind the pump speed, which makes the lubricating oil gas mass ratio in the accelerating state is significantly higher than that in the decelerating state.
A Nozzle Structure of Wire Drawing Prevention for 3D Printing Fused Deposition Manufacturing
Authors: Jieqiong Fu , Leping Bu , wenping Zeng , yong Zhang
Published: August 2020

The working principle of 3D printing fused deposition Manufacturing is introduced. The reasons for the problems of nozzle material flow and product wire drawing in the process of product printing are pointed out. The structure of traditional nozzle is analyzed, and a new structure of nozzle is proposed. The main feature of the new nozzle structure is that it can generate negative pressure in the closed space when the wire is withdrawn, thus it can effectively prevent the nozzle flow and product drawing. At the same time, by optimizing the heat dissipation system of the new nozzle structure, the stability of the nozzle printing process can be improved. The practical application shows that this new nozzle structure is effective and worth popularizing.
Hydraulic Control Research of Working Device of Grab Arm Cleaning Machine for Heavy Load and Large Depth
Authors: Yuanlong Chen , Ziquan Wang , Rongna Chen
Published: August 2020

In this paper, a kind of heavy-duty and deep cleaning machine working device is studied. The closed-loop vector method is used to establish the kinematics model of the hydraulic cylinder rod mechanism, and the Lagrange dynamics is used to establish the dynamic model of working device. MATLAB, AMESim and ADAMS are used to provide excitation signal for the servo valve, build the hydraulic simulation model, and carry out kinematics and dynamics simulation. Using different signal excitation, the displacement tracking of the working device and the change of hydraulic pressure are observed. The results show that the closed-loop vector method and Lagrange dynamics are used to establish the kinematics and dynamics model of the working device, which facilitates the study of the working device of the cleaning machine; the simulation interface is stable, and the co-simulation of control arithmetic is achieved, hydraulic system and structural dynamics; the hydraulic pressure is obtained through the co-simulation analysis. The effect of cylinder displacement tracking and the change of hydraulic pressure provided the basis for working device design and optimization.
A design method of acoustic metamaterials with buckling vibrators
Authors: Qin Shenghui , Wang Xiaoming , Mei Yulin
Published: August 2020

This paper proposes a periodic acoustic metamaterial with buckling vibrators, and investigates the design method for the band-gap characteristics of the acoustic metamaterial. The unit cell of the acoustic metamaterial is constructed by a continuous bar, curved beams embedded into the bar and the mass supported by the curved beams. The band structure of infinite period and the transmission characteristics of finite period are researched to analyze the effect of the structural and material parameters of the curved beam on the band-gap characteristics of the unit cell. And the effect of pre-strains applied to the curved beam on the band-gap characteristics is also discussed. The research illustrates that the acoustic metamaterial with buckling vibrators has a low frequency band-gap of 100-125Hz; in the frequency range of 0-200Hz, the central frequency of the band-gap increases with the increase of the beam width; the curvature radius of the beam has little influence on the central frequency of the band-gap, and a big bandwidth of the first band-gap can be obtained when the curvature radius is 20 mm; by applying pre-strain to the curved beam in a certain extent, the central frequency of the band-gap can be effectively reduced, and the attenuation more than 100 dB can be guaranteed.
A Design Method for Labyrinth Sound Absorption Structure with Micro-perforated Plates
Authors: Yu Dequn , Wang Xiaoming , Mei Yulin
Published: August 2020

A kind of labyrinth sound absorption structure is constructed by embedding multi-layer micro-perforated plates into a pipeline, and a design method is proposed to optimize its parameters to ensure a good sound absorption performance. First, the effects of parameters of the labyrinth structure on the sound absorption performance are investigated. Second, a parameter optimization method is constructed based on the acoustic impedance transfer analysis and particle swarm optimization algorithm. Then, a simulation experiment is implemented by means of COMSOL to verify the optimization results. Finally, the labyrinth structures with straight pipeline, spiral pipeline and parallel pipeline are designed and their sound absorption performances are evaluated and compared. The research shows that, the effects of the perforation diameter, the plate thickness, and the perforation rate on the sound absorption performance are non-independent while the effect of the depth of cavity is independent; the weighting coefficient in the parameter optimization method could be adjusted to ensure a big absorption bandwidth in a low frequency range; in the frequency range of 30-4000 Hz, the labyrinth structure with straight pipeline and the labyrinth structure with spiral pipeline have the same sound absorption performance; for the labyrinth structure with parallel pipeline, the inner corner radius of pipeline has a great influence on the sound absorption performance, and the radius should be greater than 20mm.
Experimental Research and Mechanical Analysis of Levelling Parametric Characterization of 3D Printer
Authors: Lianghua Zeng
Published: August 2020

Based on the Delta 3D printer this paper carries out levelling experimental research and explores the changes of position parameter of the moving parts when the hot bed is in the horizontal and inclined states. It also conducts a comparative analysis to find a method for parametrically characterizing the levelling states of the 3D printer, and grasps the attitude characteristics of the nozzle in different levelling states. At the same time, the paper also carries out a mechanical analysis to explore the effect of the blowing direction of the fan and the inclination of the hot bed on print quality under different levelling states.
Research about a Kind of Gantry Type Single-side Drive Straight Line Motion Mechanism
Authors: Jieqiong Fu , Leping Bu , Hailin Li , Yong Zhang
Published: August 2020

The article mainly has conducted comparison to three kinds of frequently-used long-span gantry type mechanism that do straight line motion, which thereby has obtained that the gantry type single-side drive mechanism hads possessed relatively prominent advantage in the smoothness, assembly debugging, reliability and maintenance aspects of the motion and it has conducted reason analysis and structural improvement to problems existed in occasions of its application in large scale equipment, long span or heavy load with impact, which therefore haves guaranteed the need for high precision and high stability in practical application.
Research on Pure Mechanical Lifting Pedal Applied to Rail Transit Vehicles
Authors: Zhang Yingyong , Hou Zhaozhan , Lin Xiangli , Xia Changkai , Yang Dongjun , Song Jianwei
Published: August 2020

With the continuous development of rail transit industry, the comfort level of drivers and the flexibility requirements of customers for the different vehicle of console are continuously improved. At present, the lifting pedal has been widely used in the industry, which are hydraulic and electric type. Pure mechanical lifting pedal has not been applied in the rail transit vehicles. Considering the service life and reliability of the products, many customers, especially foreign customers, require the pure mechanical structure to meet the requirements of different vehicle models and meet the requirements of different drivers for the console. This paper proposes a kind of pure mechanical lifting pedal applied to rail transit vehicles, which can meet the adaptability of the console to different vehicle bodies and drivers, and greatly improve the universality and reliability of the application.