bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Comfort Design for Civil Aircraft Cabin Using Ergonomics Theory
Authors: Yang Wu , Tengfei Mu , Haiqiang Wang 
Published: February 2020

Abstract
In order to improve the comfort of civil aircraft cabin, the cabin comfort system is built in this research based on the ergonomics theory and considering the influence of cabin environment, facilities, configuration, etc. In this process, filtrating and classification for the indexes which mainly influence the comfort are conducted, weight value setting is completed according to the analytic hierarchy process method and the quantify score for all the indexes is pushed. Finally, the results of cabin comfort evaluation are obtained. The case analysis results verify the effectiveness of the method. To sum up, based on this method proposal in this research, the main factors that can influence the comfort of the cabin are obtained, the comfort factors of the cabin are quantized and analysed, and last, these research results could direct the cabin comfort design.
The Application of Overset Grid in the Analysis of Impact Loads of Amphibious Aircraft during Landing on the Water
Authors: Hu Qi , Wang Ming-Zhen , Wu Bin , Zhang Jia-Xu , Xiao ZhiJian 
Published: February 2020

Abstract
In view of the complex three-phase coupling problem of gas, liquid and solid when amphibious aircraft landed on the water surface, based on the finite volume method, the overset grid technology was used to simulate the landing load characteristics of amphibious aircraft; firstly, the overset grid technology was used to establish the landing model of amphibious aircraft, and the load characteristics under different landing conditions were obtained, and compared with the model test results. The results show that, firstly, the larger the sinking speed is, the larger the load is, and the more obvious bounce phenomenon occurs; secondly, the transverse distribution of the bottom pressure gradually increases along the keel to bilge; thirdly, the load characteristics obtained by numerical simulation are basically consistent with the model test. Therefore, the overset grid technology can simulate the landing load characteristics of amphibious aircraft and provide an effective method for the landing load design of amphibious aircraft.
The Influence of Angle Parameters on Pulsation Characteristics of Elastomer Rotor Pump
Authors: Lian Jiadi , Bai Yan , Zhu Zefei , Xu Jing , Ma Jingxuan 
Published: February 2020

Abstract
In view of the poor sealing performance of elastomer rotor profile and the defect of particle sticking in the tip of rotor, the pulsation characteristics of rotor cavity under 5°, 8°, 11°, 15° and 18° conditions are studied by transient calculation of the whole flow field of rotor pump based on CFX immersion solid technology and RNG k − ξ turbulence model. When the wrap angle increases, the instantaneous mass pulsation rate decreases. When the wrap angle increases, the cavitation possibility at the inlet meshing point increases, and the pressure at the outlet meshing point increases. In order to improve the periodic impact of liquid on the elastomer and prevent the adhesion surface from falling off, the elastomer rotor should adopt the structure of small wrap angle under the condition of ensuring the width of sealing at the top of rotor.
Model-based Balancing Method of Rotors using Differential Evolution Algorithm
Authors: Zhang Yun , Li Meng , Hu Yang 
Published: February 2020

Abstract
As a major source of undesired vibration, unbalance is a ubiquitous phenomenon for many types of rotor system. To suppress the unbalance vibration and avoid the complicated and dangerous process of taking trial weights during the balancing process, a model-based balancing method of rotors is proposed in this paper. The rotor model is built to analyse the dynamic characteristics of the unbalance rotor, an unbalance identification method is presented and the optimization objective function of the unbalance vectors is given, then the differential evolution algorithm is employed to acquire the optimization solution. Finally, the accuracy of the rotor model is verified by modal tests, and the performance of the proposed method is evaluated in balancing experiment, results reflect its effectiveness.
Vibration signal Processing of Cutting Gearbox Based on Haar-Wavelet Denoise
Authors: Zhang X F , Ma F W , Wang N N , Guo Z F 
Published: February 2020

Abstract
Cutting gearbox with complex structure is difficult to obtain mechanical parameters and conduct fault diagnosis, aiming at this problem, a novel handling method is proposed after studying vibration theory of gearbox. Firstly, traditional calculation method and modal analysis are combined to acquire mechanical parameters of gearbox, especially inherent frequencies of decelerator housing and gear transmissions which are difficult to calculate. Based on Haar-Wavelet, vibration test signal of cutting gearbox is de-noised. And Fast Fourier Transform (FFT) is conducted for de-noised signal, thus operation status of gearbox can be analyzed in time domain and frequency domain. Taking a mine cutting gearbox as an example, the method proposed is used to detect parts damage in maintenance process. It is found that the tooth surface of second-stage gear transmission arise even wear, and this is consistent with actual situation. Therefore the practicability and effectiveness of this method are verified, and a new solution is provided for other gearboxes with complex structure.
Aircraft Inflight Icing Detection Based on Statistical Decision Theory
Authors: Ding D , Qian W Q , Wang Q 
Published: February 2020

Abstract
Aircraft inflight icing detection is very important for aviation flight safety. The ice alarm signal given by detectors can help the pilot to actuate the ice protection system. The application of a Neyman Pearson (NP) based statistical decision approach in icing detection is discussed in this paper. First, the flight dynamics for icing aircraft is modelled, the dynamic behaviour of an airbus influenced by ice accreting on the leading edge of wings is analysed. Then the residuals which are directly affected by the aerodynamic parameters are presented and their generation way is given. The Generalized Likelihood Ratio Test (GLRT) method is utilized in detecting the changes of residuals inflight, its performance is assessed by a flight scenario with wing ice. The results show that the fault of wing icing can be detected by every residual under different window sizes. By comparing the results of the residuals, it can be concluded that the small window size will degrade the detection performance with the longer alarming time delay and the lower probability of detection; appropriately increasing the window size can reduce the alarming time delay; diagnosing by residual of normal overload is more reliable than by the other two residuals.
Feasibility and Uncertainty Analysis of Constitutive Parameters Identification for Composite Materials Using Displacement Field Data
Authors: Liu Zhaoyan , Liu Liu , He Tiren 
Published: February 2020

Abstract
Due to the normalized average strain error is remarkably higher than the displacement error, a new cost-effective method based on the Levenberg-Marquardt method, which is a gradient-based optimization method, was presented in this paper. The unknown constitutive properties are determined through minimization of the square difference between the reconstructed DIC-measured and the FEM-calculated displacements. The feasibility analysis of this method is presented by synthetic displacement data. The covariance matrix of the extracted material constitutive parameters has been given explicitly. It has been proved that this method can significantly reduce the uncertainty of the extracted material constitutive parameter induced by the approximation error due to reconstruction algorithm and the measurement noise. The material constants show strong robustness to the measurement noise. And the optimization procedure is not sensitive to the formulation and parameters in the initial approximation of the constitutive model. A sensitive matrix was derivation and evaluation iterative in this method to improve the convergence of the optimization procedure.
Stress Analysis and Strength Test of 2500 Fracturing Truck Frame
Authors: Li Lei , Zhang Bin , Fan Chunming 
Published: February 2020

Abstract
For the fracturing trucks, which is an important member of oil and gas fracturing, the stress and strength of fracturing truck’s frame have a very significant influence on the continuous fracturing operation. This paper takes the frame of 2500 fracturing truck as the research object, analyses its stress condition, and conducts the static strength test and dynamic strength test of the whole frame of fracturing truck, respectively tests the strain of 15 measuring points of the frame under the fully loaded static condition and the right front wheel lifting condition, and finds out the distribution rule of the stress and strain of the frame. The results show that the maximum stress position of the frame under migration condition is at the root of the rear support of the tank, the total stress is 146.76 MPa, the minimum safety factor reaches 2.35, and the strength of measuring point meets the requirements.
Copula-based Estimation Method of the Expected Value Function for Robust Design Optimization
Authors: Li Xinyao , Zhang Weihong , He Liangli 
Published: February 2020

Abstract
The expected value function (EVF), which defined as function of mean value with respect to the design parameters, can simplify the solving process of the RDO with nested-double loop. The traditional method for estimating the expected value function requires a nested procedure and the computational cost depends on the product of the optimal steps and the numbers of the random variable samples. In this paper, a novel method based on copula is proposed to estimate the EVF. In the proposed method, the EVF is derived as the copula function related to the design parameters and the model output, which can be estimated with a single loop samples and the computational cost of the copula-based method does not depend on the total number of design parameters or the number of the optimal steps. Additionally, a vine-copula is introduced to the EVF so that the estimation for the EVF by two-dimensional kernel density estimation (KDE) method can be extended to the multi-dimensional design parameters problems. The present example with two cases demonstrate the effectiveness of the proposed copula-based method.
Analysis of Geometric Characteristics of Cycloidal Transmissio
Authors: Huang Xiangmao , Zhang Jing 
Published: February 2020

Abstract
In order to improve the transmission performance of RV reducer, the equation of cycloid tooth profile is deduced according to the transmission principle of cycloid.The relationship between the curvature radius of cycloid tooth profile and the rotation angle is deduced. The rotation angle corresponding to the maximum curvature radius is solved and the value of the radius of needle tooth under the circumstance of avoiding top cutting is given. Pressure angle is an index to evaluate transmission performance. This paper deduces the relationship between pressure angle and rotation angle, simulates the influence of eccentricity, radius of pin teeth and radius of distribution circle of pin teeth on pressure angle. The simulation show that the position with pressure angle of 90 degrees appears at the top and root of cycloidal gear, which is not conducive to the transmission performance of cycloidal gear, the position with the best transmission performance appears in the middle of cycloidal gear.The change speed of pressure angle near the root of tooth is faster than that near the top of tooth. The results show that increasing the eccentricity properly or reducing the radius of the center circle of the pin teeth can make the minimum curvature close to the root of tooth, which is beneficial to improving the load-carrying capacity of cycloidal gear.
Static and Dynamic Analysis of a 2T3R Five-degree-of-freedom Parallel Mechanism
Authors: Lu Bofan , Cui Guohua , Guo Qiang 
Published: February 2020

Abstract
taking a 2T3R five-degree-of-freedom 4-SPRR-SPR parallel mechanism as the research object, a three-dimensional model and a finite element model of the parallel mechanism are established. Through the static analysis of the mechanism, the weak link of the whole mechanism is analyzed. It is then modally analyzed to analyze the natural frequency and mode shape of the mechanism. On the basis of the harmonic response analysis, the vibration resistance performance and the maximum influence frequency of the mechanism under external force are obtained.
Numerical Simulation of Liquid-vapor Phase Transition Induced by a Heated Surface in a Shear Flow
Authors: Shan Xiaopeng , Nie Deming 
Published: February 2020

Abstract
The influence of the external flow on the liquid-vapor phase transition is numerically studied in this work. The bubble growth and departure from a heated surface in a shear flow is realized through a pseudo-potential based lattice Boltzmann method. The benchmark test of the pool boiling induced by a single heated plate is adopted to validate the present method. The averaged heat flux, the bubble releasing frequency and flow features are presented, along with the effects of the flow intensity on them. It is shown that the external flow significantly enhances the heat transfer of the system in two respects: increasing the averaged heat flux and the bubble releasing frequency.
Analysis of Failure Effect of Cage Thickness on Spherical Roller Bearings
Authors: Li Fang , Biao Qiu Wang , Bin Cai Jia , Wang Kai , Pan Zheng 
Published: February 2020

Abstract
Spherical roller bearings are important parts of high-frequency crushers. Using the finite element analysis software to carry on the transient dynamics analysis to the bearing obtains the bearing deformation, the pressure and so on characteristis. Then, by contrasting and analysising, it is found that under pure radial load, radial load and axial load mixed force, influence of cage thickness on bearing performance. The results show that the thickness of the cage has little effect on the deformation of the bearing under pure radial load. Under the combined action of the radial load and the axial load, the radial deformation of the bearing decreases compared with the pure radial load. The deformation of the cage under the mixed load is increased than that under the radial load.
Design of Swinging Somatosensory Game Rehabilitation System
Authors: Kou Lili , Xia Chaoyu , Hu Zhihua , Jiang Xiaojun 
Published: February 2020

Abstract
This study designed an arm-swinging somatosensory game for physically uncoordinated personnel, which realized the movement attitude acquisition, data transmission, and motion-driven game character movement. The measurement results show that in the range of 0.3g to 0.5g, the probability distribution of the ordinary person is twice or more the accuracy of the limb dissonance in the face of the same action, which proves that the game has the ability to detect and measure the reaction speed of the person. It can be used as a standard for rehabilitation levels. In addition, the game calculates relative data of the acceleration and uses which to stimulate the movement of the game character, which relaxed the threshold. Therefore, it can stimulate participation interest and promote rehabilitation.
Intelligent Sequencing of Working Steps Using Genetic Algorithm
Authors: Zhu Y P , Zhou H G , Liu J F , Tian G Z 
Published: February 2020

Abstract
There are many factors that need to be considered in the operation sequencing, and there are mutual relations among them, so it has become a hot topic worthy of study. In this paper, based on the parallel consideration of process constraint and minimum manufacturing cost, the concepts of workingsteps sequence matrix and process constraint matrix are proposed. The process constraint matrix is used to ensure that the workingsteps sequences conform to the precedence relation constraint, and the genetic algorithm is used to ensure the minimum manufacturing cost. Finally, the optimal solution of the workingsteps sequence is obtained. The connecting rod of marine diesel engine is taken as an example to verify.
Availability Assessment of Avionics Display System based on MBSA using Fault Dependent Matrix
Authors: Dong Haiyong , Cao Zhiyuan , Zhai Zhengjun , Gu Qingfan , Lu Yanhong , Wang Guoqing , Wang Miao 
Published: February 2020

Abstract
The availability of avionics display systems plays an important role in flight safety and requires a safety analysis during the design phase. The current safety analysis process is not carried out based on the system design model, so there may be inconsistencies. This paper proposes a model-based safety analysis method using a fault dependent matrix, which can be applied to commonly used system modelling tools such as Enterprise Architect. This article illustrates the utilization of the method by providing the elapsed flight time function, using MATLAB to generate the fault dependent matrix, and then obtaining the availability of the function. This method can be used to aid system safety design and improve system design efficiency.
Performance Simulation Analysis of Composite Thermal Management System for Hypersonic Vehicle
Authors: Changbao Yang , Hui Zhou , Jingyang Zhang 
Published: February 2020

Abstract
A hybrid thermal management system model of hypersonic vehicle with liquid hydrogen as heat sink and thermoelectric conversion of Brayton cycle was established. The cooling effect, fuel flow demand and thermoelectric conversion characteristics of the thermal management system in flight envelope were studied by numerical simulation. The results show that the cooling fuel demand of refrigerant loop is about 0.22g/kW.s~0.24g/kW·s, that of aerothermal cooling fuel is about 0.11g/kW·s, and that of engine wall cooling fuel is about 0.08g/kW·s. The flow rate of engine wall cooling fuel can be saved by 25%∼40% during thermoelectric conversion. Thermoelectric conversion cycle efficiency and generation efficiency can reach up to 38% and 30%. When Mach number is 3.7∼4.2 under the condition of large aerodynamic heat load, the flow rate required for engine combustion is not enough to meet the cooling flow rate, and the maximum difference is 10%.
Research on Post-processing Microstructure and Property of Titanium Components with Selective Laser Melting (SLM)
Authors: Qiang Chu Ming , Yan Zhang Shu , Qiao Su Guan , Gen Ding Ren , Wang Lei , Padde Sanjooram 
Published: February 2020

Abstract
Additive manufacturing of titanium component holds promise to deliver benefit such as reduced cost, weight and carbon emissions during both manufacture and use. To capitalize on the benefits, it must be shown that the mechanical performance of parts produced by additive manufacturing can meet design requirement that are typically based on wrought material performance properties. Of particular concern for safety critical structures is the fatigue property of parts produced by additive manufacturing. Microstructure evolution, and its influence on mechanical properties of the alloy in the as-fabricated condition, has been documented by various researchers. However, fatigue crack propagation and the effects of the directional structure have not been sufficiently studied, imposing a barrier for this technology’s potential extension to high-integrity applications. In this study, fatigue life (S-N) and fatigue crack growth (FCG) both parallel and perpendicular to the build directions was studied. The interaction between the directional as-fabricated SLM microstructure and FCG was investigated and compared to that of the hot isostatic pressing (HIP) specimens with and without the stress relief after fabricating with SLM.
Method of luminescent analysis of the state of photosynthetic apparatus of plants
Authors: Bylkov D V , Turanov S B , Korepanov V I 
Published: February 2020

Abstract
Photosynthetic apparatus and its reaction to changes in external conditions carry information about the state of the plant. Thus, under different lighting conditions, as well as with changes in nutrition and microclimate conditions, the amount and composition of chlorophyll in plant cells changes, which will lead to changes in the optical parameters of plant chlorophyll. You can track the state of the plant by changing the parameters of chlorophyll fluorescence. To monitor the state of the photosynthetic apparatus, the method of analysis of induction curves of variable fluorescence is used. The purpose of this article is to design a research facility for testing the technique of fluorescent analysis and further accumulation of statistical data on the dependence of fluorescence characteristics on lighting parameters.
The influence of diverse optical wavelengths on growth rate of Chlorella Vulgaris microalgae
Authors: Trofimchuk O A , Yakovlev A N , Turanov S B , Trigub M V , Romanenko S A 
Published: February 2020

Abstract
The effect of different optical wavelengths on growth and development of microalgae had been examined repeatedly. Many articles had been published over the subject, although the results of these investigations were frequently controversial. Depending on the number of days spent on cultivation process, yield gain could be both significant and barely noticeable. Also, irradiation intensity plays vital part in microalgae functioning.
Hydrochemical Research and Geochemical Classification of Salt Lakes in the Pavlodar Region
Authors: Ubaskin A , Kassanova A , Lunkov A , Ahmetov K , Almagambetova K , Erzhanov N , Abylkhassanov T 
Published: February 2020

Abstract
This paper presents the results of a study of the macrocomponent composition of 15 salt lakes of the Pavlodar region. For the first time, based on the data of the chemical composition and pH of the waters, the geochemical classification of the lakes of this region has been proposed. The study shows that the majority of the analyzed objects are lakes of chloride type with sodium cationic composition.
Luminescence spectra of YAG:Ce phosphors synthesized in a field of radiation
Authors: Alpyssova G , Mussakhanov D , Karipbayev Zh , Grechkina T , Zheng Shiming , Kukenova A 
Published: February 2020

Abstract
The paper presents the measurement results of the luminescence band shape for YAG phosphors upon photoexcitation. It is shown that the position and FWHM does not depend on the excitation technique, but it depends on the phosphor prehistory. The observed difference is assumed to be due to the difference in the structure of nanodefects in phosphors synthesized under different conditions.
Effect of electronic irradiation on the properties of polyethyleneterephthalate films of various producers
Authors: Kupchishin A I , Taipova B G , Gerasimenko N N , Voronova N A , Abdukhairova AT 
Published: February 2020

Abstract
Studies on the effect of electron irradiation on the properties of polyethylene terephthalate films of various brands have been carried out. An analysis of the results shows that the relative elongation of the Mylar-type film is ~ 70%, for PET ε it is 48%. According to the strength properties, Russian-made PET is more resistant to electronic effects and is destroyed at doses of 109 Gy, while the Mylar ones at 105 Gy. The calculation made according to the proposed models (exponential and generalized) is in satisfactory agreement with experimental data.