Computational Investigation Into Thermal-Mechanical Coupling Characteristics Of Disc Brake Under Anti-Lock Braking Condition,
2020
School of Automotive Engineering, Tongji University, Shanghai 201804, China;
Computational Investigation Into Thermal-Mechanical Coupling Characteristics Of Disc Brake Under Anti-Lock Braking Condition, Lijun Zhang, He Zhen, Dejian Meng
Journal of System Simulation
Abstract: The braking condition has great influence on the thermal-mechanical coupling characteristics of disc brake. A three-degree-of-freedom dynamic model of braking vehicle was built. The braking force was determined by an anti-lock braking system (ABS) which adopted the threshold-logical control strategy of wheel slip rate. With the model, anti-lock braking processes on dry and wet were simulated. In the meantime, for the sake of comparison, non-anti-lock braking processes were simulated on corresponding road. A thermal-mechanical coupling finite element model of a ventilated disc brake was established. Thermal-mechanical coupling characteristics of brake disc and brake lining were calculated under different braking …
Study On Aircraft Scheduling Optimization Based On Improved Genetic Algorithm,
2020
Aeronautic Engineering College, Civil Aviation University of China, Tianjin 300300, China;
Study On Aircraft Scheduling Optimization Based On Improved Genetic Algorithm, Yaohua Li, Wang Lei
Journal of System Simulation
Abstract: Aircraft scheduling was studied, and an optimization model of aircraft assignment based on the objective function of maximize total profit was suggested. It considered its cost and benefits by combining fleet and aircraft. In the view of the feature of this model, the innovation of genetic algorithm chromosome was carried on, and these chromosomes formatted chromosome groups. The groups interior could cross over and mutate, and the probability of crossover and mutation could dynamically adjust in accordance with adaptive values to accelerate the convergence speed, the model was resolved fast in this way. In the process of simulation with …
Control Allocation Method For Split-Drag-Rudders With Asymmetrical Deflection,
2020
School of Automation, Northwestern Polytechnical University, Xi'an 710072, China;
Control Allocation Method For Split-Drag-Rudders With Asymmetrical Deflection, Xiaobo Qu, Weiguo Zhang, Jingping Shi
Journal of System Simulation
Abstract: The split drag rudders (SDRs) were usually used for the yaw control of tailless flying wing aircraft with the symmetric deflection mode. This approach was simple and effective, but the upper and lower deflectors of the SDRs were constrained to deflect symmetrically, limiting the distribution and control mode of the deflectors, reducing the maximum available moment in pitch axis and roll axis, affecting the handling performance of the aircraft flying at low speed. A certain flying wing UAV was used as the study model. The CFD method was adopt to investigate the aerodynamic characteristic of SDRs operating in either …
Simulation And Research On Surface Subsidence Caused By Abandoned Goaf Under Earthquake,
2020
1. College of Safety Science and Engineering, Liaoning Technical University, Fuxin 123000, China;;2. Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education, Liaoning Technical University, Fuxin 123000, China;;3. Tunnel & Underground Structure Engineering Center of Liaoning, Dalian Jiaotong University, Dalian 116028, China;;
Simulation And Research On Surface Subsidence Caused By Abandoned Goaf Under Earthquake, Tiejun Cui, Yundong Ma, Laigui Wang
Journal of System Simulation
Abstract: To understand the overlying rock strata caused by filling and abandoned goaf under earthquake, ensuring that the upper surface of subgrade is not due to the earthquake generating additional settlement which affects normal use, the goaf and the overlying rock strata were simulated with filling rate(0.85, 0.9, 0.95) and earthquake acceleration(0.2 g, 0.3 g, 0.4 g). Simulation using PFC3D as platform, modeling of complex strata, and the introduction of filling and the simulation method of earthquake, the overlying rock strata migration, stress, and the surface of the subgrade settlement characteristics were obtained. The additional earthquake surface subsidence law was …
Redundancy Allocation Optimization Design For Complex System Based On Simulation,
2020
1. Department of Technical Support Projects of Academy of Armored Forces Engineering, Beijing 100072, China;;
Redundancy Allocation Optimization Design For Complex System Based On Simulation, Haidong Du, Junhai Cao, Wu Wei, Xu Dan
Journal of System Simulation
Abstract: For the redundancy question of complex system reliability design, from the angle of product design, on the basis of sensitivity analysis of different design program, it has be proved to add redundancy design for subsystem with lower reliability and less redundancy will enhance the probability of reliability more for complex system. On the foundation of above research, the program screening simulation experiment was designed according the related restraint and optimization algorithm for redundancy design was proposed. An example of series-parallel connection system was given, obtaining the optimization design program based on Anylogic software to prove the rationality and effectiveness …
Simulation Research For Highway Maintenance Management System Based On System Dynamics,
2020
College of Architecture Engineering, Zhejiang University, Hangzhou 310058, China;
Simulation Research For Highway Maintenance Management System Based On System Dynamics, Zhang Hong, Fangmin Ren, Rongbei Zheng
Journal of System Simulation
Abstract: It is necessary to study the long-term and dynamic relationships between highway maintenance efficiency and stakeholders, thus helping decision-making on the policies and maintenance plans around the highway maintenance issue. Based on analyzing dynamics and complexities of highway maintenance system, the system dynamics model for the highway maintenance simulation system was established. This study was aimed at simulating and evaluating the long-term dynamic relationships of the interactions among the highway pavement performance, operator's maintenance plans, users' satisfaction and administration department's budget allocation scheme for a long time period. The effectiveness and application of the proposed model were demonstrated …
Research On Face Recognition Method Under Uncontrolled Illumination Variation,
2020
College of Electrical and Information, Jinan University, Zhuhai 519070, China;
Research On Face Recognition Method Under Uncontrolled Illumination Variation, Kong Rui, Zhang Bing
Journal of System Simulation
Abstract: A new face recognition algorithm is proposed with high recognition rate under uncontrolled illumination conditions. The new algorithm process face images in advance using Weber local descriptor, which means that the processed image is insensitive to illumination changing. An improved linear discriminant analysis algorithm is adopt for feature extracting, finally, nearest neighbor classifier based on Euclidean distance is applied to classify. The new algorithm is tested on Yale and The Extended Yale Database B face database respectively, in comparison with classic face recognition algorithms, the performance of the proposed method is superior to other's under uncontrolled illumination variation …
Spam Filtering Based On Variable Precision Rough Set Decision Tree,
2020
1. College of Computer Science and Engineering, Northeastern University, Shenyang 110819, China;;
Spam Filtering Based On Variable Precision Rough Set Decision Tree, Wang Jing, Xingwei Wang, Zhao Yue
Journal of System Simulation
Abstract: Email is favored by people and has become one of the most universal information communication methods, inspired by its convenience and low cost. However, E-mail has also been abused by malicious people. As a result, Internet has been polluted by spam. Spam not only wastes bandwidth resource, disrupting people's normal life and work, but also influences routine application of mail servers and poses a serious threat to Internet security. Decision tree algorithm was utilized to train extracted mail head feature information to construct a decision tree, which could be further used to filter spam. Variable precision rough set model …
Adaptive Harmony Pso Based Trusted Qos Routing Scheme,
2020
1. School of Computer Science and Engineering, Northeastern University, Shenyang 110819, China;;
Adaptive Harmony Pso Based Trusted Qos Routing Scheme, Xinxin Sun, Xingwei Wang, Huang Min
Journal of System Simulation
Abstract: With the continuous expansion of the network scale and the growing number of new applications, the Internet is faced with the challenges of security, dynamicity, heterogeneity and other problems. The emergence of new businesses brings higher demands on network quality of service (QoS) than before. At the same time, a huge amount of network security problems lead to people not being trusted on network. The trustworthiness of the networks and the QoS routing were investigated. A trusted QoS routing scheme based on adaptive harmony PSO search algorithm was proposed with QoS satisfaction degree and trustworthiness value satisfaction degree considered …
Recent Advances In Finite Element Simulation Of Machining Processes,
2020
Harbin University of Science and Technology, Harbin 150080, China;
Recent Advances In Finite Element Simulation Of Machining Processes, Caixu Yu, Chunbin Cai, Huang Cui, Erliang Liu
Journal of System Simulation
Abstract: Recently, the finite element simulation technology has been widely applied in machining simulation and has played an irreplaceable role in the investigations of machining mechanism of metal and composite materials, optimization of cutting parameters,etc. The importance of finite element simulation, commonly used software and material constitutive model were introduced. The latest research progress of the finite element simulation of cutting at home and abroad was summarized, including the simulation of chip morphology, the simulation of cutting force and cutting temperature, tool wear simulation, the machined surface integrity, simulation of the effect of multi-steps cutting on cutting process and finite …
Study Of Modified Particle Swarm Optimization Algorithm Based On Adaptive Mutation Probability,
2020
1. School of Internet of Things Engineering, Jiangnan University, Wuxi 214122, China;;
Study Of Modified Particle Swarm Optimization Algorithm Based On Adaptive Mutation Probability, Huang Song, Tian Na, Zhicheng Ji
Journal of System Simulation
Abstract: Mutation operator is an effective method to solve the premature of particle swarm optimization. According to the characteristic of population diversity, a modified particle swarm optimization based on adaptive mutation probability and hybrid mutation strategy was proposed. Aggregation degree was introduced to adjust the mutation probability of each generation, and a hybrid Gaussian and Cauchy mutation based on the global-best position and an adaptive wavelet mutation based on the worst personal-best position were carried out. The simulation of the comparisons with other particle swarm optimizations with mutation operator on matlab was proposed. The results demonstrate that the proposed algorithm …
Bernstein Neural Network Chaotic Sequence Prediction Based On Phase Space Reconstruction,
2020
1. Department of Electrical Engineering, Xinjiang University, Urumqi 830047, China;;
Bernstein Neural Network Chaotic Sequence Prediction Based On Phase Space Reconstruction, Hongli Zhang, Ruiguo Li, Wenhui Fan
Journal of System Simulation
Abstract: In view of the low prediction accuracy and the complex structure of traditional BP neural network, RBF neural network and AR model, a new prediction method with the combination of phase space reconstruction and Bernstein neural network was proposed, and PSO algorithm was used for parameters optimization of combination forecast model. Taking Sprott-J chaotic system and traffic flow system as models respectively, the combination of autocorrelation and Cao method was used to reconstruct phase space of chaotic time sequence, the refactoring phasor of time delay and Bernstein neural network were used to establish the prediction model, and do comparative …
Application Research On Children's Indoor Fire Escape Education System Based On Virtual Reality Technology,
2020
School of Cisco Informatics Guangdong University of Foreign Studies, Guangzhou 510006, China;
Application Research On Children's Indoor Fire Escape Education System Based On Virtual Reality Technology, Chunhua Hu, Xiaomei Chun, Shihong Chen
Journal of System Simulation
Abstract: It is significant to study children’s fire escape education in the virtual reality. The existing fire escape educations for children mostly adopt the ways of watching books and videos, lacking vitality and interactivity. According to the psychological characteristics of children, the models for virtual fire scene and the virtual character were built using the 3Ds Max. Based on Virtools platform, a game style of children's indoor fire escape education system was designed, with the integration of human-computer interaction, voice, smoke, and animation demo. Users experience the fire escape by auditory, visual and virtual behavior, with controlling virtual character to …
Study On Diffraction Effects Of Planar Underwater Shock Interaction With Rigid Quadrilateral Structure,
2020
College of Field Engineering, PLAUST, Nanjing 210007, China;
Study On Diffraction Effects Of Planar Underwater Shock Interaction With Rigid Quadrilateral Structure, Yuchun Li, Zhenru Gao, Bin Feng, Liu Qiang, Shen Wei
Journal of System Simulation
Abstract: Finite element simulation using LS-DYNA was performed to investigate the interaction of underwater planar shock wave and rigid quadrilateral structure. The characteristics of diffraction waves on both front and back surface of the rigid structure were analyzed and trace lines were gained. Vortex was formed near the corner of the structure diffracted by underwater shock with a void part of zero pressure existing in the local fluid region. Bulk cavitation near fluid-structure interface leads fluid pressure to drop to negative value, which is an important damage factor to merged structures. A derived pressure formulas of diffraction wave to rigid …
Online Product Quality Prediction For Multi-Phase Based On Local Model,
2020
1. College of Information Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China;;
Online Product Quality Prediction For Multi-Phase Based On Local Model, Li Yuan, Yayun Yan, Xiaochu Tang
Journal of System Simulation
Abstract: For offline quality prediction accuracy for batch process, an online prediction method for multi-phase product quality was proposed based on the local model. According to the repetitive cycle of batch process, batch process could be divided into stable phase and transitional phase using the repeatability factor. The least squares support vector machine (LSSVM) model was established in stable phase using the time slice of same phase position, and the LSSVM model was established in transitional phase using optimal subset based on diffusion distance, which made the natural properties of current stable phase and transitional phase be similar to …
Research On Modeling Of Pump Model Based On Rbf Neural Network,
2020
College of Engineering, Bohai University, Jinzhou 121013, China;
Research On Modeling Of Pump Model Based On Rbf Neural Network, Qinghui Wu, Qinghuan Shen, Xinjun Wang
Journal of System Simulation
Abstract: On the basis of research on pump characteristics and pump model, a modeling method based on RBF neural network with K-means clustering algorithm was proposed. With k-means clustering algorithm the center vector and base width parameters, in which lie in the hidden layer, were optimized by input data sample. The weights between the hidden layer and the output layer were optimized by input-output data sample with least squares method. The neural network models of the pump characteristic and pump comprehensive model were separately trained and checked using the detected data. Its results suggest that reasonably choosing the number of …
Framework And Methodology For Logistics Simulation Based On Fidelity Theory,
2020
1. School of Automation, Beijing University of Posts and Telecommunications, Beijing 100876, China;;
Framework And Methodology For Logistics Simulation Based On Fidelity Theory, Yukun Liu, Fu Yu, Mengrui Shan
Journal of System Simulation
Abstract: The quality issue of simulation was studied from the perspective of fidelity. The basic concepts and dimension structures of simulation fidelity and simulation utility were defined according to the features of discrete event logistics system (DELS) simulation after a relationship analysis between fidelity and problems in DELS simulation. A fidelity-based four-stage lifecycle framework with prescriptive contents for each stage was constructed to improve the quality of simulation implementation. A simulation fidelity management process model (FMPM) was built to ensure three processes: pre-control of fidelity design, in-process fidelity management, and afterward fidelity evaluation. Operable methods and tools such …
Fast Generating Algorithm Of Interest Roaming Path Based On Freehand Sketch,
2020
Shanghai Film Academy, Shanghai University, Shanghai 200072, China;
Fast Generating Algorithm Of Interest Roaming Path Based On Freehand Sketch, Dongjin Huang, Pengbin Tang, Youdong Ding
Journal of System Simulation
Abstract: Considering properties of touch interaction of intelligent terminals, a fast generating algorithm of interest roaming path based on freehand sketch was proposed and applied in the 3D mobile interactive system of virtual display. The self-adapting reduce method was adopted to optimize the feature points of sketch curve for addressing too much feature points in local. The piecewise curve fitting method was used to quickly generate smooth obstacle avoidance path for handling the case of sketch line over the obstacle, and the final roaming path was adjusted to approximate the freehand sketch as much as possible by error control. Experimental …
Integrated Dynamic Equivalent Model Of Super Capacitor Energy Storage System,
2020
College of Electrical and Information Engineering, Hunan University, Changsha 410082, China;
Integrated Dynamic Equivalent Model Of Super Capacitor Energy Storage System, Xinran Li, Tingting Xu, Shaojie Tan, Xingting Cheng, Xiaojun Zeng
Journal of System Simulation
Abstract: As a high-power energy storage device, super capacitor (SC) is applied in micro-grid energy storage, secondary frequency regulation and peak load shifting in power system, and the research of which has become a hotspot. A second-order model of SC monomer suitable for the grid simulation was established, and the parameter identification using the charge and discharge experiment data under constant current and constant power modes was conducted based on genetic algorithm. A SC energy storage system has been set up in Simulink/Matlab based on the established second-order model of SC. The integrated dynamic equivalent model of SC energy storage …
Novel Access Control And Interference Alignment Based Mimo Link Scheduling Algorithm,
2020
Electronic Engineering Institute, Hefei 230037, China;
Novel Access Control And Interference Alignment Based Mimo Link Scheduling Algorithm, Zui Xiong, Keren Wang, Jin Hu, Xu Yun
Journal of System Simulation
Abstract: Interference alignment (IA) attracts global attention for its capability of improving the throughput of MIMO systems. To ensure the system stability, researchers proposed access control and IA combined in link scheduling. In order to compensate for the deficiency of minimum interference leakage IA (MinL-IA) algorithm in terms of the expected signal gain, an alternative IA algorithm named MaxSINR-IA combined with access control was applied, and a novel semi-distributed scheduling algorithm（SDSIA-MaxSINR） algorithm was proposed. The theoretical analysis and simulation results demonstrate that SDSIA-MaxSINR algorithm is evidently superior to SDSIA-MinL algorithm in a higher SINR requirement, although MaxSINR-IA is inferior to …
