bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the Side Effects of Hall Effect Based on Phase Change Method
Authors: Zheng Wenying , Lai Jiatong , Xie Feng 
Published: May 2022

Abstract
The basic principle of some side effects in measuring electromagnetic induction intensity of Hall element is briefly introduced, and the effect of these side effects on the measurement results is discussed. It is preliminary that the effects of Nernst effect and Righi-Leduc effect on the experimental results are not significant and can be ignored, and the unequal potential difference contributes the most to the experimental results. In other experiments with Hall element as measuring instrument, it can also provide a reference for reducing system error.
Distortion model of star tracker on-orbit calibration algorithms based on interstar angles
Authors: Chen Zhanglei , Zheng Yong , Zhan Yinhu , Li Chonghui , Chen Bing , Zhang Houtian 
Published: May 2022

Abstract
On-orbit calibration techniques for star trackers are critical for precise attitude determination in artificial satellites. As calibration algorithms based on interstar angles do not require a priori information about the satellite attitude, they are a focal point for studies in this area. In these algorithms, the distance between each ideal star point and the principal point on the focal plane is required to model lens distortions. These distances are typically approximated using the distances between observed star points and the principal point, named the simplified approximation method. We propose an embedded iteration method and perform numerical simulations and ground-based night-sky experiments to compare the results of star tracker calibrations based on the two proposed methods. The results indicate that the simplified approximation calibration model has systematic model errors, which are predominantly manifested in the principal point estimates. Nevertheless, the simplified approximation converges more rapidly and easily than embedded iteration. Therefore, embedded iteration should only be used if the calibration accuracy is critical, large lens distortions are present, and ample computational resources are available. Otherwise, simplified approximation should be used to model lens distortions.
Autonomous positioning and navigation method of individual soldier combining multi-source data based on stellar vector
Authors: jie Shen , Jian Xing , Yuan Gao , Zhilong Ye , Chiyu Zhang 
Published: May 2022

Abstract
This article introduces a fully autonomous navigation method for individual soldiers performing missions in the field, which can be used in conjunction with the existing satellite navigation such as GPS and Beidou and inertial integrated navigation methods to make up for the deficiencies of traditional navigation methods. The existing satellite navigation methods such as GPS/Beidou are susceptible to electromagnetic interference, and may fail due to enemy interference during war. Inertial navigation cannot get rid of its own "zero drift" shortcomings. The navigation method based on stellar vector calculation is one This is a purely passive navigation method that does not receive external interference and can navigate autonomously under extreme conditions. This article introduces the principle of the navigation method based on stellar vector calculation, and conducts simulation and field experiments. The accuracy of the navigation method is up to 300m after verification.
CanSat payload with Autogyro for descent in experimental rocket flights: Development, CFD analysis, and preliminary test on free-fall
Authors: Ventura Alejandro , Nuñez-Quispe Johan , Sanchez Godo , Santivañez Jafet 
Published: May 2022

AbstractThis research work develops the design of a CanSat payload assisted with an Autogyro system for a controlled descent in experimental rocket flights. The design, development, Computational fluid dynamics (CFD) analysis, and a preliminary test on free-fall had been carried out. The data obtained from this study and test allowed us to determine the relationship between the drag coefficient and the projected geometry of the CanSat by using CFD simulation and data such as speed and acceleration from the free-fall test. The results allowed us to propose an estimation for the drag coefficient behavior on the speed range studied.
Topological design and kinematic analysis of a novel hybrid space control mechanism
Authors: Qi Yang , Wang Yu , Liu Jie , Wang Hong , Wu Wenxuan , Lu Enli 
Published: May 2022

Abstract
In order to meet the demand of space mechanism for Chinese space station, a novel hybrid space control mechanism is designed. The hybrid space control mechanism is made up of a serial mechanism and a parallel mechanism. The serial mechanism realizes large workspace and the parallel mechanism provides excellent position accuracy. The physical prototype of the novel hybrid space control mechanism is built up, and the mobility and foldability of the serial mechanism are exhibited. Its kinematic and workspace analysis are carried out, which correctness is verified through comparison with simulation results. The aforementioned research laid a solid foundation for future study about the hybrid space control mechanism.
Response analysis of solid missile grain in UAV-borne environment
Authors: Peng Li , Hong-wei Xu , Xuan Wang , Jie Zhang 
Published: May 2022

Abstract
Solid rocket motor of UAV-borne missile experiences the effect of cyclic temperature. For the single chamber double thrust rocket motor, the finite element model of the solid motor grain is established. Temperature field and stress-strain field under a mounted flight cycle are studied. The research results can provide reference for the structural integrity evaluation of the single chamber double thrust rocket motor and UAV flight system.
Numerical investigation on fluid characteristics of supersonic mixing layers with splitter plate in a confined space
Authors: Li Chunlei , Li Yingkun , Li Weixuan , Zhu Liang , Chen Xiong , Yang Shuifeng , Wu Yan 
Published: May 2022

Abstract
High-speed airbreathing engines has been going on for more than a century, since French engineer Reina Lauren first developed the concept of the ramjet. Kelvin-Helmholtz (K-H) instability and compressibility effects on the evolution of supersonic mixing layer growing rate have been widely investigated in experimental and computational ways. The present study proposed a quasi-DNS solver which is written in Fortran 90, the mixing process of the supersonic planar mixing layers is analyzed in detail, especially, the process of the vortex rolling up, stretching, pairing and merging are also reported in present study. It is noteworthy that the mechanisms of K-H instability are analysed in detail, and the baroclinic term has a great influence on the growth of the supersonic mixing layer in confined space.
Flow Mechanism and Feasibility Investigation of Hypersonic Jet Control Surface
Authors: Ji Yi-min , Yang Hua , Li Zheng , Gao Zheng-hong , Chen Shu-sheng 
Published: May 2022

Abstract
Hypersonic vehicle is a kind of vehicle that can fly at more than Mach 5 in the atmosphere. To solve the control problem of hypersonic vehicle, this work investigates the feasibility of hypersonic jet control surface. The numerical simulation method based on compressible Reynolds averaged Navier-Stokes equations with SST turbulence model is adopted. Firstly, the mechanism of hypersonic flow around airfoil with different deflection angles of aerodynamic control surface, which is arranged at the rear 30% of the airfoil behand a 2% chord gap, is analyzed and studied in detail. Then, a jet nozzle is set on the trailing edge of the airfoil to calculate and analyse the jet control effect of different total pressure ratio with 1.5mm gap (Mach 5, total pressure ratio from 1 to 300, altitude 40km). Thus, the flow mechanism, aerodynamic characteristics and control efficiency of the jet control surface is obtained. The results demonstrate that the aerodynamic control surface is effective in the hypersonic flow, and the control effect is proportional to the deflection angle of the control surface. Besides, the jet control surface also has control efficiency, which changes linearly with the total pressure ratio of the jet. And with the increase of jet total pressure ratio, the jet control surface can achieve the same control ability as the aerodynamic control surface. It reveals that the jet control surface is potentially a good control technique for hypersonic vehicle.
Study on the influence of baffles on the aerodynamic coefficients of long-span flexible bridge section
Authors: Chi Xiaoling , Chen Changping , Qian Changzhao 
Published: May 2022

Abstract
In the study of wind resistance performance of Bridges, the study of aerodynamic coefficients directly affects the accuracy of wind resistance performance of bridges. In this paper, the aerodynamic coefficients of main girder section of single-tower single-side suspension curve suspension cable footpath bridge are studied by numerical simulation and wind tunnel test. In order to improve the wind resistance performance of the bridge, the aerodynamic performance of the bridge section was improved by optimizing the bridge section and adding baffles, and the aerodynamic coefficient was obtained by wind tunnel test. The first section in your paper
Estimation of vehicle dynamics by fusion image and radar based on subtraction convolutional neural network
Authors: Kao I-Hsi , Chan Ching-Yao 
Published: May 2022

Abstract
The main goal of this paper is to estimate the vehicle dynamic by image and radar fusion through a deep learning model. In the designed deep learning model, multiple convolutional neural networks are used. In addition, tensor subtraction is added in the model to express the time-series features. In addition to the fusion of images and radar, the accuracy of using a single sensor to estimate vehicle dynamics is also tested. The result shows that the performance of using the fusion of radar and image is better than using a single sensor. Finally, by using both signals in the deep learning structure, the mean square errors of estimation angular x, angular y, angular z, and linear velocity obtained from our model have values of 2.86e-6, 4.72e-6, 6.19e-5, and 2.41e-2, respectively.
Dynamic simulation of complex multi-hinge space flap mechanism
Authors: Feng Yunwen , He Zhiyu , Xue Xiaofeng , Dong Meng 
Published: May 2022

Abstract
Dynamics simulation of large civil aircraft complex multi-hinge space flap mechanism was studied, and a set of dynamics simulation modeling method of complex multi-hinge space flap mechanism based on Motionview was proposed. Firstly, a moving digital prototype of the complex multi-hinge space mechanism was constructed. The multi-point constraint RBE3 element was used to associate the intersection points of the rigid multi-hinge mechanism to the body of the flap surface considering flexibility, and the rigid-flexible coupling dynamic model of the flap mechanism was formed. The dynamics simulation of the mechanism was carried out under the aerodynamic load conditions of cruise, take-off and landing, the driving torque and hinge point load dynamics indexes of the complex multi-hinge space flap mechanism were obtained. The simulation results show that the driving arm of the inner mechanism bears most of the lateral load from the flap wing surface, the radial direction of the joints bearing at each hinge bears the aerodynamic pulling force from the flap wing surface. And the inner mechanism of the flap is the main bearing part, the load capacity of the inner rocker arm is almost four times that of the outer rocker arm. The dynamic simulation research can provide a certain reference for the design and improvement of the complex multi-hinge space flap mechanism.
Model order reduction for structural nonlinear dynamic analysis based on Isogeometric analysis
Authors: Li Wei , Chen Zhaolin , Guo Yujie 
Published: May 2022

Abstract
Model order reduction approach generates lower dimensional approximations to the original system while preserving model’s essential information and computational accuracy. For nonlinear structural dynamic problems, where the stiffness matrix is configuration dependent, an iterative solution procedure is inevitable and a revisit to all the elements is essential for updating the stiffness matrix. In this paper, the nonlinear dynamics of the planar curved beams and 3D cylindrical shells are studied based on the isogeometric analysis and their model order reductions are investigated based on the proper orthogonal decomposition and discrete empirical interpolation method (POD-DEIM). Numerical results show that IGA-based POD-DEIM method significantly improves the computational efficiency of the nonlinear dynamic analysis of the beam and shell structures.
A New Normalization Form Based on a General Unified Normalization Computing for the Gravitational Potential Tensor of Arbitrary Orders
Authors: Han Chao , Dong Tianshan , Cheng Ming , Wang Yu , Liu Shenggang 
Published: May 2022

Abstract
Taking a general unified recursive algorithm for computing the normalized gravitational potential based on Cunningham's formula into account, the numerical stability of both the recursion for spherical harmonic series and the pre-processing for the spherical harmonic coefficients are discussed. Then a new method of normalizing the associated Legendre polynomial is proposed.
Design of opposed piston 2-stroke internal combustion engine test platform
Authors: Pei Tianyou , Qiu Shuheng , Chen Feixue , Gao Weiwei , Li Zheng , Zhang Chi 
Published: May 2022

Abstract
Opposed piston two-stroke engine, due to its characteristics of fast expansion, high power density and indicate efficiency, and dynamic balancing, attracts many researchers’ attention. In order to explore its combustion performance, a novel test platform consisting of a drive system and combustion control system is proposed in this paper. The drive system mainly contains a 75-kW induction motor, a synchronous gearbox, and two crankshaft mechanisms. The displacement of the piston and chamber pressure is acquired and used to control combustion parameters. Using this mechanical device, the rotary motion can be converted to the opposite movement of the two pistons precisely. All the designed functions of the platform are verified by the combustion experiments of an opposed-piston two-stroke prototype. Furthermore, the experimental data is used to verify a one-dimension simulation model to evaluate the combustion characteristics of the prototype.
Scenario demand-based design of new energy vehicles from the inside out and its practices
Authors: Li Yong , Liu Fuyong , Hao Ruimin 
Published: May 2022

Abstract
Based on the related theories of scenario study and pure electric vehicle interior design, this paper constructs scenario demand-based interior design process framework and method for pure electric vehicles. After completing construction of the design process framework and method, corresponding design practice is carried out to complete theoretical verification. The demands are sorted through KANO model. Then, a design framework is built according to the demand sorting result. Finally, specific program is designed based on the design framework. This paper perfects the theoretical system for interior design of pure electric vehicles. The interior design program for future pure electric vehicles will provide design references for interior designers.
Steering Trapezoid Optimized Design of the Off-road Racing Car
Authors: Chen Jing , Shen Xinyi , Wang Aoqi 
Published: May 2022

Abstract
The parametric analysis model of the suspension and steering system of racing car has been established. Two design principle for Splitting Point of steering trapezium has been expounded. Taking minimum deviation between actual wheel turning angle from the angle and theoretical turning angle, the minimum variation of the toe angle as the optimal object, Optimization Design of Splitting Point has been studied. The results indicated that, the wheeled vehicle steering characteristics and the correspond between steering system and suspension has been improved by Optimization Design of Splitting Point. A set of AWD racing steering system design steps and optimization methods are summarized, which provides a clear idea for solving related problems.
Lightweight Design of Gearbox Housing of Baja Racing Car Based on Topology Optimization
Authors: Zeng Zhiyuan , Zhang Yijun , Tang Dingyong 
Published: May 2022

Abstract
In view of the National Undergraduate Baja Contest, an initial model is established for the reducer. According to the calculated force of the transmission part, the reinforcing ribs of the bearing hole are optimized and the initial model is optimized and checked several times using the topology optimization module of ANSYS. The safe and reliable housing model with a weight reduction of 35.82% makes full use of the material properties, thus contributing to lightweight of the whole vehicle under the premise of sufficient strength.
Forming simulation and process optimization of inflatable strut reinforcement plate for automobile back door
Authors: Zhang Haibo , Wang Tianwu 
Published: May 2022

Abstract
Taking a new energy SUV back door inflatable strut reinforcement plate as an example, three key process areas are set on the surface of the plate, and the structural characteristics and forming characteristics of each area are analyzed. On this basis, a finite element model is established. Preliminarily select the process parameters that meet the actual production requirements, use AutoForm to perform numerical simulation analysis of stamping forming, compare the forming quality of the product under the forming process and the drawing process, to achieve the purpose of process optimization, and then determine the final stamping process plan. Taking the maximum springback as the evaluation index, an orthogonal test with 4 factors and 3 levels is designed, and the parameter scheme with the best forming quality through the range analysis method provides a reference for the subsequent actual production of the part.
Optimal Design of Suspension System of Four-wheel Drive Baja Racing
Authors: Wang Aoqi , Chen Jing , Shen Xinyi 
Published: May 2022

Abstract
In order to match the four-wheel drive system of Baja racing, improve the handling stability and driving comfort of the car, and optimize the parameter design of the suspension. Establish a suspension system model in ADAMS, conduct motion simulation, analyze important suspension parameters, modify the suspension hard points according to the analysis results, and optimize the suspension parameters. Finally, a set of excellent suspension parameters is obtained, and the performance of the suspension system can be improved. The suspension parameters of the simulated racing car have been determined, and other performance parameters have also been improved through hard-point modification. Using ADAMS to perform motion simulation of the suspension system saves time and can efficiently realize the optimal design of the suspension system.
Hyperelastic Model with Energy Limiter for EPDM and Its Numerical Application
Authors: Xing-gui Fan , Jin-sheng Xu , Xiong Chen , Hui Li , Bing-dong Tan 
Published: May 2022

Abstract
To simulate the working process of EPDM PSD of dual-pulse solid rocket motor from beginning to failure, we use a hyperelastic model with erergy limiter to model this working process. In traditional practice, the consistent tangent moduli of mechanical model is derived by analytic method, however, the analytic method is tedious and fallible. To solve this problem, we introduce numerical approximate method (complex-step derivative, which is proved to be of second-order for suitably small perturbation and does not suffer from inherent subtractive cancellations ) to derive the consistent tangent moduli, which is simple, robust, and efficient, and can be easily implemented into commercial finite element software. Finally, we simulate a case of unixial tension of a dumbbell-shape and compare the simulation results with the analytic results, a good agreement between the two kinds of results is observed.
Improvement of the model by preprocessing big data of tapping temperature prediction industry
Authors: Dong Huwei 
Published: May 2022

Abstract
The quality of steel is highly related to the tapping temperature. At present, many models can predict the tapping temperature to a certain extent. However, after in-depth exploration of the model, it was found that most of the models have a better performance for the tapping temperature prediction of common steel, while the special steel was ignored. It is because that most models are rough in the data processing. The neglect of incomplete data, uneven distribution problems have caused models to over-emphasize some types of steel, while it does not agree with the production demand of steel mills. This paper proposes Bayes neural network model with the improved filling method based on K-Means algorithm and data homogenization method based on K-Means algorithm. The statistical results show that the model has a better performance at error within ±5°C ratio, mean absolute error, root means square error, etc. than the traditional ones.
Multi-objective flexible job-shop scheduling problem researching based on improved adaptive NSGA-II
Authors: Zhang Lei 
Published: May 2022

Abstract
To solve the scheduling problem of products manufacturing in the military electronic equipment enterprises, a multi-objective flexible job-shop scheduling model was established with the objective of minimum the make span, production costs and equipment load. According to the characteristics of flexible job-shop scheduling problem, an adaptive NSGA-II algorithm was proposed in this paper, which could change the probabilities of crossover and mutation operation at different stages of genetic processes. To improve the diversity of population, the algorithm performed independent crossover and mutation operations on the working processes and equipment. Besides, a population independent elite retention strategy was adopted to avoid the loss of optimum solutions. At last, the feasibility and validity of the improved adaptive NSGA-II are verified by a flexible job-shop example.
Design rationale representation approach based on intent-driven ontology and MBD model in design change
Authors: Huang Zhengxiong , Chen Yazhou , Xu Songqing 
Published: May 2022

Abstract
Aiming at the problem that the design rationale (DR) in design change has a wide range of sources and various forms, which makes designers difficult to reuse them, this paper proposes a DR representation approach for design change. Firstly, the overall three-layer structure of the approach is introduced; Use OWL to express the concepts related to the designer and product model in design change, and use SWRL and SQWRL to mine and extract useful DR information; A DR representation tool is developed based on CAD software to export the low semantic level information to the ontology as well as import the high semantic level information back to the Model Based Definition (MBD) model. The approach combines the expressing ability of ontology and visuality of 3D annotation to capture, represent and reuse DR information, which promotes the design change under the MBD environment. Finally, a stamping part is taken as an example, and designers can refer to the experience of the predecessors related to the changed parameter through using the tool.