bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental and Theoretical Analysis of the Factors Influencing the Flow-out Rate from a Bottle
Authors: Jiang Yuxin 
Published: April 2021

Abstract
While looking for parameters that may affect the experiment results, one of the basic experimental principles can be adopted: the principle of controlling a single variable. This experiment is centered on the flow rate of the liquid in the plastic bottle, and the fixed value that remains unchanged is the physical properties of the bottle itself and the liquid. The density of the liquid and the angle of the bottle are two factors that could affect the flow-out rate. The ten different angles from 0° to 90° are chosen to be observed. And five different densities of alcohol are chosen to be tested as well. Under reasonable error control, the angle of the bottle body can be obtained when the liquid flow rate is the maximum. Based on the experimental derivation process recorded in this article, the basic knowledge of statistics is used, combining with as much precision measuring equipment as possible. Then, the Bernoulli equation is also used to calculate the ideal value, which is also compared with the actual value, to get the impact factors. The experimental results are scientifically analysed and deduced, and finally, substantial results are obtained.
Research on flexible sensor based on 3D printing manufacturing by fused deposition molding
Authors: Song Dongping , Xu Xinghua , Zhang Yongkang 
Published: April 2021

Abstract
a flexible capacitance and resistance sensor is studied, which is manufactured by single step using 3D printing technology of fused deposition molding. Compared with the existing manufacturing technology of flexible sensor, the 3D printing technology has the advantages of low manufacturing cost and simple manufacturing process. The capacitive force sensor and the resistance temperature sensor are fabricated by melting deposition and forming 3D printing respectively using the wires of conductive and dielectric materials. The capacitive force sensor adopts parallel plate structure, and its relative sensitivity can reach 0.088% / N. the relative sensitivity of the resistance temperature sensor can reach 2.2% / °C. The resistance and capacitance sensors can be used as touch sensors, which have great potential in the fields of electronic skin, intelligent wearable devices and soft robots.
Research on the Vibration Response of Cylindrical Vessel under Explosion Shock Wave in Confined Space
Authors: Liu Yalei , Gu Xiaohui 
Published: April 2021

Abstract
The experimental research is carried out on the shock wave vibration response of the cylindrical explosive container under the explosion at the center point. First, a horizontal flat-head cylindrical explosion vessel was designed and the shock wave vibration test placement was carried out; secondly, the explosion shock wave vibration test in a confined space was carried out under different charges; then the vibration conditions at several typical locations were carried out Comparative measurement and analysis of its vibration frequency characteristics. The test results show that the shell vibration acceleration value at the measuring point is related to the charge amount and the distance from the explosion center; the shell vibration frequency close to the middle ring is dominated by the natural fundamental frequency, and as the shell moves away from the center to the ends, The low-frequency vibration gradually increases, and the vibration frequency component of the container head is single, and its main frequency is determined by the natural frequency of the head.
GIS vibration principal analysis and modeling
Authors: Qu Bin , Zhang Li , Fang Qiong , Chen Rong , Han Bin , Wang Xiaopeng , Wang YanHua 
Published: April 2021

Abstract
Based on the most basic electromagnetic theorem, this paper analyses the most basic principle of GIS vibration formation. The characteristic formulas of magnetostriction and Ampere force vibration are deduced, and the characteristic frequencies of them are both 100Hz. Combined with the structural characteristics of GIS, this paper analyzes the two common vibration models of induced eddy current and induced circulation, and calculates their analytical formulas, which can easily calculate the induced current, and provides a reference for GIS vibration research.
GIS vibration test method and characteristic signal recognition
Authors: Qu Bin , Wang Yongning , Zhou Liangsheng , Wang Kun , Wang Ziyue , Wang Jian , Chen Haowei 
Published: April 2021

Abstract
Based on the characteristics of GIS insulation and mechanical fault types and practical measurement experience, two typical vibration measurement methods, direct measurement method and natural frequency measurement method, are proposed in this paper. Then, based on the real data of experiment and field measurement, the vibration signals of typical insulation fault and mechanical fault such as spike discharge and end cover looseness are compared, analyzed and summarized, and their respective data characteristics are extracted, which can provide the basis for the determination of GIS vibration fault types.
A Method Based on Initial-phase-point Analysis for Determining the Fault Mode of the Unbalanced Vibration of Turbine Rotor
Authors: Wen Xiankui , Liu Shi , Qing Shaowei , Li Xiang , Deng Tongtian , Zhang Shihai 
Published: April 2021

Abstract
Rotor imbalance is one of the common faults of turbines, but traditional analysis methods are difficult to distinguish different fault modes, e.g. the original imbalance of rotor and the thermal bending of rotor. By introducing the concept of initial phase point, a rotor imbalance model is established and corresponding identification method for original imbalance and thermal bending is developed. Through the analysis and processing of practical cases, it is proved that this method is effective and can carry out the fault diagnosis of rotor unbalance accurately.
Collision Simulation and Optimization Analysis of Vehicle Thin-Walled Components Based on Trolley Test
Authors: Hu Yi , Liu Li , Chen Mengwei 
Published: April 2021

Abstract
Based on the response data of the frontal impact test of the trolley, the frontal impact simulation and analysis of the double-tube model of the trolley were carried out using finite element software. Starting from the thin-wall deformation mode, acceleration and energy curve changes as response indicators, the error between simulation and experiment is studied. With the goal of improving the simulation accuracy of the model, the influence of strain rate effect on the collision response is studied, and the deformation mode and acceleration curve are compared with those without strain rate and actual vehicle test. The final result shows that considering the strain rate effect is obviously better than not considering the strain rate in terms of the acceleration peak and the number of thin-wall deformation folding.
Numerical simulation on the noise reduction of underwater pile-driving using a bubble curtain
Authors: Gao Yuning , Ma Jun , Ding Yue 
Published: April 2021

Abstract
Aiming at the problem of heavy noise pollution caused by underwater piling operation and, to protect the marine ecosystem near the construction site, this paper discusses the attenuation effect of bubble curtain system on underwater noise generated by piling operations, basing on the previous research on underwater bubble sound attenuation and the attenuation characteristics of sound propagation of different media. Using COMSOL Multiphysics finite element analysis software, the noise field of underwater piling and the model of underwater bubble curtain are established to study the influence of the bubble curtain on the pressure peak values at different depths generated by the same noise source, and the attenuation effect of the bubble curtain on underwater noise is discussed. The results show that the peak sound pressure level of underwater noise can be attenuated by about 8 dB using the bubble curtain.
Design of a new type of F-COFT controlled BUCK-BOOST converter
Authors: Chen Guanghui , Huang Gege , Zhang Ke 
Published: April 2021

Abstract
As an important method of pulse frequency modulation (PFM), constangt off-time (COFT) is widely used in switching power. However, the switching frequency changes with the input and output voltage, which increases the power consumption of the switching power and is prone to high electromagnetic interference (EMI). Therefore, a new fixed frequency COFT control method (F-COFT) is designed. By designing a charging timing circuit that carries input and output voltage information, the input and output voltage information is fed back to the timing module to realize dynamic adjustment of the constant-off time to ensure the stability of the frequency and eliminate the influence of frequency changes on the circuit. Through LTSPICE simulation, the feasibility of the scheme is verified.
Intelligent recognition-based unloading device design for university container logs
Authors: Yi Jiale 
Published: April 2021

Abstract
Timber resources are strategic resources for China’s national economic development, and the traditional container transport log unloading method is inefficient and requires manual handling, but due to the increase in residents, infrastructure efficiency and other issues, the log handling efficiency also needs to be greatly enhanced, so a high-efficiency, energy-saving and environmentally friendly log loading and unloading device that can work autonomously has become the urgent need of the moment in ports, wood yards and other places.
Research of Integrated Impeller Modeling and Five-axis Machining Technology based on Reverse Engineering
Authors: Zhao Xi , Pan Junbing , Li Lin 
Published: April 2021

Abstract
Five-axis NC technology and reverse engineering provides critical support for industrial development and has been an important subject for scholars to study. This paper focused on aviation impeller and discussed the integrated application of NC machining technology and reverse engineering. It collected the shape point cloud data of the impeller through 3D scanner and Geomagic Wrap software and completed the reverse parametric modeling using Geomagic Design X software. The impeller model is complicated in structure which is hard to machine on three-axis and four-axis machine tools, hence developed a five-axis machining program by using the NC programming software of Hypermill and carried out actual machining test. The results showed that the error between the machined sample and the research model is less than 0.05 mm, which can satisfy engineering requirements. It also indicated that the NC program developed by Hypermill software has high machining accuracy and safety, and the integration of reverse engineering and five-axis technology presents positive significance to the innovative design and machining for complicated engineering surfaces.
Research of An Automatic Mopping Assistant Robot
Authors: Zhao Xiaoyang , Lu Ming 
Published: April 2021

Abstract
This paper proposes an automatic mopping assistant robot, it has functions of auto-following, providing clean water, storing up sewage and washing mops. Firstly, to get the goal of auto-following, the robot has 1 ultrasonic module and 2 infrared modulesthat are connected with 1 Arduino motor driver that on 1 Arduino UNO board, the former for distance, the latter for direction, they cooperate to give robot ability of following people and keeping a safe distance fromusers. Secondly, interms of the mechanical structure, the robot is designed with 3 water sinksthat areinterconnected, which can provide water for cleaning mops at any time;finally, There is a cross-shaped brush on bottomof the cleaning sink, so when anelectric mop is put on it and turned on,the mop will be cleaned. The experimental results show that the robot achieves the expected function and runs well.
Simulation Analysis of Vortex Tube Parameters for Desalination Device Using Ship Exhaust Heat
Authors: He Shiji , Zhou Changqing , Zhang Wenbo , Liu Bingjin , Cui Yue 
Published: April 2021

Abstract
The waste heat energy of diesel exhaust of current small and medium-sized ships is a big waste, while the distillation method in marine desalination is energy-intensive and its equipment is large, as well as the reverse osmosis method is seriously polluting. In order to solve the above problems, a waste heat desalination device for small and medium-sized ships is designed based on the cold-heat separation effect of vortex tube. In this paper, based on the study of the vortex tube working principle, the parameters of the vortex tube are designed and calculated, and the optimum inlet temperature at a certain pressure is calculated to further determine the design parameters of the whole device. According to the basic laws of thermodynamics, a mathematical model is established to describe the changes in the state of diesel exhaust.
An innovative design of mechanical auxiliary device for assisting flexor and wears
Authors: Zhang Jiankang , Yan Zhen , Chen Yijing 
Published: April 2021

Abstract
Today, the aging of the population is becoming more and more prominent, and the aging of the population brought about by the social, health and other problems on the family and society for the elderly function also has a higher and higher requirement. Through research and literature review, most of the elderly have the symptoms of leg and foot inconvenience or nape and lower back pain, which brings great obstacles for them to wear pants and socks with bending body. However, it is difficult for the accessory products of flexor wearers sold on the market to truly complete the function of non-flexor movement. For this reason, this project designed a device that can help the elderly to complete the movement of wearing pants and socks without bending down. Moreover, through multi-stiffness adjustment, linkage drive structure is designed to realize the integrated wearable process. According to ergonomics, relevant design is made for the device size, and the combination of multiple adaptive modules can realize the adaptive matching for the elderly with different heights and body shapes.
Research on auxiliary bed - lifting device for the elderly
Authors: Yang Yuanhang , Qi Lei , Jing Haonan 
Published: April 2021

Abstract
Although there are devices to assist the elderly to get out of bed in China, most of them are aimed at the disabled elderly or still need artificial assistance. For some old people with certain activity ability, there is no appropriate auxiliary equipment at present. Based on this background, the electric push rod and gear system are used to realize the back lifting, leg bending and auxiliary standing functions of the elderly when they get up and lie down. The matching design of connecting rod mechanism and gear mechanism is adopted to meet all the needs of the elderly when they get up and lie down with a simple mechanism.
AGV of Mechanical Auxiliary Parking Based on Self Driving
Authors: Sun Haotian , Zhang Wenbo , Xie Anbo 
Published: April 2021

Abstract
In order to solve the problem of parking difficulties in urban residential areas, a small auxiliary parking device is proposed. Starting from solving the social pain points such as unreasonable parking space planning, residents’ random parking, and reducing parking difficulty, it achieves the effect of assisting parking space planning and reducing parking difficulty. The device mainly provides power through the motor, and drives the drum to realize binary control by controlling the steering wheel of the vehicle owner, that is, controlling the switching of the whole movement, and the switching of the front back and left right of the control device. By pressing the spring switch on the wheel, the front control motor drives the gear clutch device to complete the bidirectional switching from left and right movement to back and forth movement. Through the shear fork supporting mechanism and separate self-locking slide rail, the car is lifted and the parking device is driven away.
Snow removal device on top surface of inclined roof building
Authors: Chen Weijie , Wu Yingxin 
Published: April 2021

Abstract
In view of the difficulty of snow removal in existing sloped-roof buildings in my country, a new type of snow removal device on the top surface of sloped-roof buildings is designed. The mechanical structure realizes snow removal at heights of sloped-roof buildings, reducing manpower and material resources, and solving the problem of existing devices Shortcomings in this area. Compared with the traditional building snow removal device, the device can be applied to a variety of building heights, with efficient snow removal, light weight, simple operation and easy to carry
“Weaver” — multi DOF flexible gripper device
Authors: Qiao Lingfeng , Wang Chengzhi , Lu Minxi 
Published: April 2021

Abstract
In the process of automatic processing, production and assembly, flexible manipulator has the characteristics of high flexibility, multiple degrees of freedom, etc. It can transfer payload to some narrow spaces, and can carry any object, which is widely used. Therefore, a mechanical gripper based on flexible track is designed. In terms of structure, a servo drive system is built by adopting line drive. The gripper is composed of a bunch of links, which are connected with each other under passive joints. At the same time, in terms of function, the free configuration function of the flexible track can achieve the function of grabbing objects of any shape by wrapping.
Research on index system of evaluation of Prefabricated Building Industrialization based on BIM Technology
Authors: Yang Jiarui 
Published: April 2021

Abstract
Firstly, this paper analyzes the functions of the BIM platform, comprehensiv ely considers and extracts the required evaluation index of industrial efficiency of pref abricated buildings, and calculates the weight value. Then, the actual case data extracti on of BIM platform was applied, and the fuzzy comprehensive evaluation method was used to evaluate the efficiency of the case. Finally the structure was calculated and ana lyzed, so as to obtain the impact results of the prefabricated building industrialization e fficiency after the application of BIM platform.
Dynamic Bayesian Network-based Surface Roughness Accuracy Grade Prediction in Turning
Authors: He Kang , Yang Quan , Wu Bo , Li Xiaobiao , Zhang Xiuxiang 
Published: April 2021

Abstract
A hybrid DBN model - Discrete and gaussian mixture hidden markov model with the weighted evidence fusion strategy (DGMWEFS), based on Discrete hidden Markov model (DHMM), Mixture of Gaussians hidden Markov model (MoGHMM), and DS evidence theory, is developed for surface roughness accuracy grade prediction. By analyzing the influence of tool vibration on the surface topography, the singular spectrum with wavelet analysis is proposed to extract the fusion feature (Ec). The ρ comparison is developed to overcome defect of the traditional probability comparison. For the multiple outputs of DHMM and MoGHMM, the weighted evidence fusion strategy based on the DS evidence theory is proposed for final decisions. Experiment of turning the workpiece with multi-material and hardness scale shows that, compared with the DHMM (prediction accuracy 85%) and MoGHMM(prediction accuracy 78%), the DGMWEFS proposed estimates the surface roughness with higher accuracy (prediction accuracy 93%).Therefore, the monitoring strategy proposed can be better used for supervising accuracy grade, which can be readily integrated into a computer integrated manufacturing environment.
Debonding Failure Analysis of Honeycomb Sandwich Composite Radome
Authors: Miao Hongbo , Fan Jinjuan 
Published: April 2021

Abstract
The radome made of C sandwich structure failed after different service time. The failure causes were analyzed by ultrasonic C-scan inspection, fracture surface inspection, section metallographic inspection, bonding strength test, manufacturing process analysis and viscidity testing of film. The results show that: The debonding position of honeycomb composite radome is between honeycomb and outer skin. That is caused by the weak adhesive strength between honeycomb and skin. The main cause of weak adhesion is that the film loses fluidity and viscidity due to the overlong holding time. Weak adhesion is not related to the heating temperature, compressive stress and local honeycomb contamination. The holding time should be controlled to be less than 6h in later manufacture of the radome to keep fluidity and viscidity of film.
Analysis of Paper Children’s Furniture Design Based on 4R Principle
Authors: Yuan Zeng , Yi Shi 
Published: April 2021

Abstract
At present, green environmental protection has become a common topic of concern all over the world, and the principle of “low carbonization” is also the focus of designers in the design of paper children’s furniture in the future. How to implement the 4R principle into children’s furniture has become the most important issue for designers at present. This paper summarizes the design principles of children’s furniture, puts forward the design scheme of children’s furniture based on 4R principle, and forecasts the future children’s furniture market.
An Efficient Broken Glass Sorting Device Based on Color Detection and Human-Machine Interactive
Authors: Liao Lingyu , Wu Yifan 
Published: April 2021

Abstract
With the increasing production of wasted glass in China, the recycling of glass is becoming more and more significant. Recycled broken glass must be color-recycled, and the key issues for color separation of glass are color recognition and sorting of glass in different color. Utilizing the TCS3200D color sensor to distinguish the color of broken glass and setting the algorithm according to its optical characteristics, as well as using a mechanical module with vibration separation, to export broken glass to the conveyor belt in order, and then by the ordering of MCU, pneumatic solenoid valve control the high-pressure jet device to sort the broken glass. At the same time, the human-computer interactive image processing technology based developed by LabVIEW is used to set up the human-computer interactive interface, so as to maximize recycling.
Cooling adsorption type desert air water extractor based on STM32
Authors: Yang Yiqiao , Li Jinshuai , Chen Guangyu 
Published: April 2021

Abstract
With dry climate and scarce rainfall, the annual precipitation of desert areas is below 250 mm. The daily temperature difference of desert climate is very significant, the near surface temperature can reach 60 °C to 80 °C in summer and autumn noon, but it can be reduced to below 10 °C at night. If the climate characteristics of the desert can be reasonably used for low-cost water intake, it will provide great convenience to the aborigines and migrants in the desert. Some existing air water intake devices cannot produce good water intake effect due to the low air humidity in the desert. The device uses semiconductor refrigeration to improve the relative humidity of air, so that the adsorption efficiency is significantly improved. Using the low specific heat characteristics of sand to optimize the convection and condensation device, greatly reducing the energy consumption and mechanical failure rate. By using the P, N type semiconductor’s Palp effect, STM32 controls the switching circuit and then controls the voltage direction of the two ends of the semiconductor to realize the switching of refrigeration and heating modes. In this way, low-cost and high-efficiency water intake can be realized in the desert.