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Articles 3841 - 3870 of 4163

Full-Text Articles in Numerical Analysis and Scientific Computing

Simulation Of Blade Erosion Of Variable-Pitch Axial Flow Fan, Chunxi Li, Zhang Dan, Xuemin Ye Jan 2019

Simulation Of Blade Erosion Of Variable-Pitch Axial Flow Fan, Chunxi Li, Zhang Dan, Xuemin Ye

Journal of System Simulation

Abstract: Affected by the performance of dust precipitators, significant differences of blade erosion regimes and erosion rates in induced draft fans are exhibited due to various particle diameters and concentrations. A 3D numerical simulation on a single-stage axial fan is carried out using Fluent to investigate the blade erosion regimes. The important features including particle trajectories under different particle diameters, erosion pattern and particle mass concentration distribution on the pressure and suction surfaces are examined, and the effect of particle mass concentration on erosion rate is analyzed. The results show that the erosion regimes are mainly affected by particle diameter. …

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Research On Numerical Simulation Of Continuous Roll Forming Process Of Four-Roll Plate Bending Machines, Wang Yan, Xinqing Zhu, Jiefei Hu, Ximin Cui Jan 2019

Research On Numerical Simulation Of Continuous Roll Forming Process Of Four-Roll Plate Bending Machines, Wang Yan, Xinqing Zhu, Jiefei Hu, Ximin Cui

Journal of System Simulation

Abstract: In order to improve the production process quality of four-roll plate bending machines, a four-roll bending mathematical model is established and a finite element simulation is used to verify its accuracy. The influence of side roller displacement, sheet thickness, and rotational speed on the radius and quality of the final shaped plate are analyzed. The simulation results show that as the displacement of side roll increases, the downtrend of the sheet forming radius gradually slows down and the quality of the formed sheet also decreases. Plastic strain fluctuation on plate surface decreases as the thickness increases, quality of thick …

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Network Mode And Economy Analysis Of Photovoltaic-Battery System In Microgrid, Weiqing Sun, Liu Tong, Liu Bo, Youjia Wang Jan 2019

Network Mode And Economy Analysis Of Photovoltaic-Battery System In Microgrid, Weiqing Sun, Liu Tong, Liu Bo, Youjia Wang

Journal of System Simulation

Abstract: Due to its various power sources, flexible operation modes and ability of making full use of distributed energy resources, microgrid has received broad attention. Focusing on the two different network modes of photovoltaic-battery system (PVBS), the power flow distribution of photovoltaic-battery hybrid system (PVBHS) and photovoltaic-battery integrated system (PVBIS) under different operation conditions are analyzed separately and the corresponding operational economy calculation model is proposed. Using the life cycle cost (LCC) analysis method, the economy of PVBHS and PVBIS is compared. A 6-bus microgrid lab system and the IEEE 33-bus test system are taken as the study case. Results …

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Research On Fault Detection And Isolation Method For Typical Hydraulic System, Lixia Zhang, Fuzhou Feng, Xiangbo Liu, Wang Min Jan 2019

Research On Fault Detection And Isolation Method For Typical Hydraulic System, Lixia Zhang, Fuzhou Feng, Xiangbo Liu, Wang Min

Journal of System Simulation

Abstract: The integrated transmission device possesses some inherent characteristics of the multiple working modes, discontinuity, multi-coupling, which lead to problems such as the fault detection difficulty and fault isolation inaccuracy. Analyzed in detail the structure and working principle of torque converter compensation circuit, the bond graph modeling and diagnosis methods were studied. Then the relationship between global analytical redundancy and fault characteristic matrix is established, which accurately accomplishes the fault detection and isolation. Finally, the rules between the analytical redundancy relations and different faults are verified by simulation experiments, which indicate that the design and application of FDI based on …

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Orm-Dcsk: A Novel Dcsk Communication Scheme, Zhang Gang, Chuangang Wang, Guoquan Li, Jinzhao Lin Jan 2019

Orm-Dcsk: A Novel Dcsk Communication Scheme, Zhang Gang, Chuangang Wang, Guoquan Li, Jinzhao Lin

Journal of System Simulation

Abstract: To overcome the intra-signal interference components and the large average bit energy existing in decision variables, an improved RM-DCSK algorithm, named ORM-DCSK, is proposed. An orthogonal chaotic generator is designed to eliminate the intra-signal interference components. Besides, the signal frame format is expanded to reduce the average bit energy. The BER is derived and simulated in AWGN channel. The simulation results show that ORM-DCSK performs greatly better in BER performance than RM-DCSK algorithm without sacrificing transmission rate.

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Adaptive Real-Time Tracking Control System For Ammonia Desulphurization, Lixin Ma, Mengyuan Lü Jan 2019

Adaptive Real-Time Tracking Control System For Ammonia Desulphurization, Lixin Ma, Mengyuan Lü

Journal of System Simulation

Abstract: In the ammonia desulphurization system, we can use forecast devices to compensate the delay time of sensor in the process of detection. But the error of the parameters in the mathematical model of the method has a great influence on the performance of the control system. So it is unable to realize the real-time tracking of the load. Concerning this problem, we put forward a kind of real-time tracking control system based on model reference adaptive technology which could be able to track the load—model reference adaptive technology is used in the ammonia desulphurization technology. It breaks the normal …

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Prediction Of Alumina Density Based On Lssvm, Guimei Cui, Haijin Yang, Piliang Liu, Yu Kai Jan 2019

Prediction Of Alumina Density Based On Lssvm, Guimei Cui, Haijin Yang, Piliang Liu, Yu Kai

Journal of System Simulation

Abstract: The prediction model of alumina density based on the PSO algorithm with swarm activity to optimize LSSVM method is built. According to the production process characteristics of aluminum electrolysis and historical data, the input variables of the model is determined. It can solve these problems that Particle Swarm Optimization (PSO) algorithm is with the risk of premature convergence and least square support vector machine is time consuming with parameter selection. The method uses swarm activity as diversity index. When swarm activity is quickened to descend, evolution operation is added to modify the positions or velocities of particles to …

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Complete Coverage Belief Function Path Planning Algorithm Of Autonomous Underwater Vehiclebased On Behavior Strategy, Wenyang Gan, Daqi Zhu Jan 2019

Complete Coverage Belief Function Path Planning Algorithm Of Autonomous Underwater Vehiclebased On Behavior Strategy, Wenyang Gan, Daqi Zhu

Journal of System Simulation

Abstract: For the complete coverage path planning of autonomous underwater vehicle (AUV), a complete coverage belief function path planning algorithm based on behavior strategy is proposed by introducing the behavior strategy and using the concept of map belief function, which can make AUV accomplish the complete coverage and avoid obstacles automatically. The grid belief function is constructed based on environmental information, using different function values to distinguish between the obstacle, the covered and the uncovered grid. AUV selects the next navigation position by path planning strategy. Next navigation position is selected by behavior strategy if AUV navigates to the …

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Gradient Descent Self-Tuning Control Of Flexible Space Manipulator After Capturing Operation, Cheng Jing, Chen Li Jan 2019

Gradient Descent Self-Tuning Control Of Flexible Space Manipulator After Capturing Operation, Cheng Jing, Chen Li

Journal of System Simulation

Abstract: The flexible vibration is generated after all-flexible space manipulator capturing a satellite, and the collision leads to unsteadiness of system. For the unstable composite system, the self-turning control algorithm based on hybrid trajectory is designed in this paper. The theory of gradient descent is used for parameter adaptive rate design to realize the real time adjustment of the PID control parameters. A supervised controller is designed through Lyapunov function to generate the stability and H∞ tracking characteristic of the system. The hybrid trajectory is generated based on the concept of virtual force, which is used to accomplish …

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Design And Implementation Of Human-Computer Interactive System For Public Information Service In Smart City, Han Feng, Xiaoling Li, Xiuwen Sun, Lingyu Ji Jan 2019

Design And Implementation Of Human-Computer Interactive System For Public Information Service In Smart City, Han Feng, Xiaoling Li, Xiuwen Sun, Lingyu Ji

Journal of System Simulation

Abstract: In view of the singleness on the interactive contents and forms of public information services in Smart City, we design and implement a human-computer interactive system. We analyze both user behavior characteristics as self-portrait effect, landing effect, honeypot effect and Smart City application design characteristics as socialization, intellectualization and humanization. Regarding these characteristics, we specify the interactive contents and the corresponding interactive forms and design the UI features for improving user experience. We research on the technologies involved in the implementation of the system, including gesture recognition based on segments, face recognition and resource integration using WPF, besides, holographic …

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Bound Analysis Of Signal Processing Method On Laser Doppler Velocity & Vibration Measurement, Peng Xiang, Liu Bo Jan 2019

Bound Analysis Of Signal Processing Method On Laser Doppler Velocity & Vibration Measurement, Peng Xiang, Liu Bo

Journal of System Simulation

Abstract: Laser Doppler measurement technology has attracted more and more attention and application in the field of high precision measurement. For different signal characteristics and processing methods, there are different constraints of the measurement, which would determine the measurement precision and accuracy. Based on the principle of laser Doppler velocity & vibration measurement and from the perspective of digital signal processing, the constrains related to the sampling rate, data length and time interval are analyzed. The time-interval homogenization processing method of the second sampling data, and the effect on the measurement range of aliasing about reference light frequency and signal …

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A Study Of Adaptive Simulated Annealing Particle Swarm Optimization (Asapso) Algorithm For Building Pipe Routing Design, Changtao Wang, Xiaotong Sun, Zhonghua Han, Zhu Yi Jan 2019

A Study Of Adaptive Simulated Annealing Particle Swarm Optimization (Asapso) Algorithm For Building Pipe Routing Design, Changtao Wang, Xiaotong Sun, Zhonghua Han, Zhu Yi

Journal of System Simulation

Abstract: To solve the building pipe routing design problem, a mathematical model was formulated. The length of pipe, the number of bends and the laying area were taken as the comprehensive evaluation indexes. Adaptive Simulated Annealing Particle Swarm Optimization (ASAPSO) algorithm was proposed for optimization. In the ASAPSO algorithm, a self-adaptive parameter adjusting strategy and simulated annealing algorithm adjusting the optimal particle location were introduced to enhance the capacity in escaping from the local optimal. A new population initialization method based on the cost of selection probability was designed at the initial population. The simulation showed that compared with the …

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Robust Fuzzy Adaptive Compensation Control Of Reconfigurable Manipulator, Weimin Ge, Keke Yan, Xiaofeng Wang, Zengchang Liu Jan 2019

Robust Fuzzy Adaptive Compensation Control Of Reconfigurable Manipulator, Weimin Ge, Keke Yan, Xiaofeng Wang, Zengchang Liu

Journal of System Simulation

Abstract: Aiming at the uncertainty of the dynamics system of reconfigurable manipulator, a control law based on the fuzzy adaptive algorithm is proposed to adaptively approach the friction and external disturbance in the system, achieving the compensation control of the reconfigurable robot arm. At the same time, the robust items are added in the control law in order to improve the compensation precision and anti-interference performance of the control law, and reduce the approximation error of the algorithm. By Lyapunov stability theory, it is proved that the proposed fuzzy adaptive control law and the robust fuzzy adaptive control law can …

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Evasive Maneuvers Against Missiles For Unmanned Combat Aerial Vehicle In Autonomous Air Combat, Xizhong Yang, Jianliang Ai Jan 2019

Evasive Maneuvers Against Missiles For Unmanned Combat Aerial Vehicle In Autonomous Air Combat, Xizhong Yang, Jianliang Ai

Journal of System Simulation

Abstract: For UCAV having the capability to deal with autonomous air combat, the flight dynamics model with the overload input and the 3-dimensional proportional navigation guidance model were established. Based on artificial neural network, an evasive maneuver decision was presented for avoiding incoming missiles. The degrees of freedom for UCAV-missile system were reduced by coordinate transformation, which simplified the complicated model as a non-linear model with relatively small amount of input and a single output. After the neural network samples were generated and trained, evasive results could be directly predicted from the relationship of positions between UCAV and missile …

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Evaluation On Pilot Performance Of Detecting Runway Incursion Based On Visual Simulation, Kun Yang, Xiangyu Ge, Pengfei Ju, Bai Jie Jan 2019

Evaluation On Pilot Performance Of Detecting Runway Incursion Based On Visual Simulation, Kun Yang, Xiangyu Ge, Pengfei Ju, Bai Jie

Journal of System Simulation

Abstract: In order to evaluate the performance of pilots using HUD and PFD to detect runway incursion under approach and landing circumstances, a visual simulation system for transport category airplanes is designed by visual simulation technology. The system includes models of head up display (HUD), primary flight display (PFD), cockpit of transport category airplanes, 3-D terrain of airport. And a program is written to read flight joystick data to control flight. On this visual simulation system, performance experiment of pilots using HUD and PFD to detect runway incursion is carried out. Analysis results show that the response time of …

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Simulation Research Of General Cargo Terminal Operation Based On Plant Simulation, Zhixiong Liu, Xiong Yang, Xingxu Deng, Yuting Chen Jan 2019

Simulation Research Of General Cargo Terminal Operation Based On Plant Simulation, Zhixiong Liu, Xiong Yang, Xingxu Deng, Yuting Chen

Journal of System Simulation

Abstract: Combined with the key link of the general cargo loading and unloading operations, the system simulation method is employed to analyze the production efficiency for the general cargo handling operation. The Plant Simulation software is used to design the main modules of the production process such as collection operation, vessel arrival, yard operation, horizontal transportation, ship-loading operation. The simulation model of general cargo handling operation is established based on the whole operation process. The simulation model is running based on the practical production data, and the efficiency of the crane, transitions time and the average storage period are analyzed. …

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Synthesized Capability-Effectiveness Evaluation Method Of Contribution Ratio To System-Of-Systems, Xiaobo Li, Lin Mu, Zhe Shu, Guibai Liu, Wang Tao, Weiping Wang Jan 2019

Synthesized Capability-Effectiveness Evaluation Method Of Contribution Ratio To System-Of-Systems, Xiaobo Li, Lin Mu, Zhe Shu, Guibai Liu, Wang Tao, Weiping Wang

Journal of System Simulation

Abstract: Since modern combats represent the development trend of systematization and network, it has become an essential requirement to build and use the equipment through a system-of-systems approach. The evaluation of contribution ratio to system-of-systems (CRSOS) is an important means to advance the development of weapon equipment systematization, and it is also urgently needed to carry out in-depth research on the theoretical concepts and methods. This paper establishes the research framework of CRSOS from the classification of contribution type and the equipment management life cycle. It proposes a CRSOS definition from the perspective of capability-efficiency dimension based on current …

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Research On The Conceptual Modeling Of Coa For Analysis Of Wargaming, Zhaopeng Liu, Shaojun Liu, Guangya Si, Zhou Wen Jan 2019

Research On The Conceptual Modeling Of Coa For Analysis Of Wargaming, Zhaopeng Liu, Shaojun Liu, Guangya Si, Zhou Wen

Journal of System Simulation

Abstract: On the background of the Campaign COA analysis with simulation system wargaming, aiming at the information sharing problem in the course of wargaming, the composition and difference of the domestic and foreign COA are deeply analyzed, and the development trend of the COA modeling methods are also analyzed. The COA models are divided into the conceptual models and the solution models for the first time, and the limitation of the current COA conceptual models is analyzed with this viewpoint. For the characteristics of across the campaign level and tactical level during the process of the COA wargaming, utilizing …

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Research And Realization Of 3d Scene Modeling In Chemical Industry Park, Hongyue Zhu, Bin Chen, Xiaodong Wang, Rongxiao Wang, Zhengqiu Zhu, Xiaogang Qiu Jan 2019

Research And Realization Of 3d Scene Modeling In Chemical Industry Park, Hongyue Zhu, Bin Chen, Xiaodong Wang, Rongxiao Wang, Zhengqiu Zhu, Xiaogang Qiu

Journal of System Simulation

Abstract: Aiming at the visualization of atmospheric pollution monitoring data in chemical parks, the method of 3D modeling in chemical industry parks is studied, and a remote-web-login and realistic three-dimensional visual information management system based on GIS remote sensing data and sensors’ monitoring data is realized. For simple objects such as buildings, rapid modeling based on GIS data is used; for complex objects such as chemical devices, 3ds Max and UAV tilt photography are combined to model; in terms of visualization, Cesium-based web front-end development technology is adopted. By adopting the above modeling methods in combination, not only the repetitive …

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Online Modeling With Semi-Supervised Locally Weighted Partial Least Squares Based On Expectation Maximization Algorithm, Weili Xiong, Mingchen Xue, Yanjun Li Jan 2019

Online Modeling With Semi-Supervised Locally Weighted Partial Least Squares Based On Expectation Maximization Algorithm, Weili Xiong, Mingchen Xue, Yanjun Li

Journal of System Simulation

Abstract: As only small proportion of labeled data can be obtained from chemical processes, an online soft sensing modeling method based on semi-supervised locally weighted partial least squares is proposed . The labeled and unlabeled historical data are accumulated to construct training database. The similarity between the newly measured data and the sample points in the database are calculated and used as the weight of each data point. The semi-supervised locally weighted partial least squares model is constructed, and the Expectation Maximization (EM) algorithm is employed to estimate the parameters of the model. Online prediction achieves simulation results of debutanizer …

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Historical Data Modeling Based On State Observation, Dong Ze, Erxin Yin Jan 2019

Historical Data Modeling Based On State Observation, Dong Ze, Erxin Yin

Journal of System Simulation

Abstract: Aiming at the problem that the conventional historical data modeling method can not overcome the influence of disturbance on modeling accuracy, a historical data modeling method based on state observation is proposed. In this method, the data with the characteristic from dynamic to steady state are selected from the historical data as the modeling data, which is subjected to zero initialization processing based on the final steady state value. The processed data is then divided into two segments. The first segment is used to track the state of the prediction model, and the final observed state is used as …

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Facial Expression Recognition Based On Improved Dictionary Learning And Sparse Representation, Li Ming, Xiujiao Peng, Wang Yan Jan 2019

Facial Expression Recognition Based On Improved Dictionary Learning And Sparse Representation, Li Ming, Xiujiao Peng, Wang Yan

Journal of System Simulation

Abstract: In order to overcome the problems induced by illumination andocclude in facial expression recognition and reduce the time required by sparse representation classification, the facial expression recognition algorithm withfusion of HOG feature and improved KC-FDDL dictionary learning sparserepresentation is put forward. Improved K-means cluster and Fisher discriminationdictionary learningis implemented on thetraining setgenerated by extracting HOG features of normalized expression image.Facial expression classification is conducted by thesparse representation with weighted residuals. Experimental results on the Cohn-Kanade databaseshow that this method is lower time-consumingand more accurate for similar facial expression classification than other facial expression classification methods.

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Modeling And Simulation Of Difg Unit With Stator Inter-Turn Fault, Boqiang Xu, Liling Sun, Wenjuan Du Jan 2019

Modeling And Simulation Of Difg Unit With Stator Inter-Turn Fault, Boqiang Xu, Liling Sun, Wenjuan Du

Journal of System Simulation

Abstract: The mathematical model of doubly fed induction generator (DFIG) with stator inter-turn fault, which presents itself as standard form state space equation, is deduced and established, for the first time. The corresponding simulation model, i.e. Matlab S-function block is developed and embedded in a Matlab built-in routine simulating DFIG unit comprising wind turbine, converter, related mechanical/electrical control and DFIG. The simulation model of DFIG unit with stator inter-turn fault is established, which is a beneficial extension of Matlab simulation. The stability of DFIG unit under the healthy and faulty conditions is analyzed by using simulation. The results show …

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Research And Application Of Damage Development Of Rock Mass With Complex Structure Under Horizontal Offset, Tiejun Cui, Shasha Li, Yundong Ma, Laigui Wang Jan 2019

Research And Application Of Damage Development Of Rock Mass With Complex Structure Under Horizontal Offset, Tiejun Cui, Shasha Li, Yundong Ma, Laigui Wang

Journal of System Simulation

Abstract: In order to understand the stress and strain of the complex overlying strata with horizontal offset in service time of mining, the model of the overburden mining regions is created by PFM with the simulation platform of PFC3D. The overlying strata contains five layers including intrusive igneous rock, of which the bottom rock has anticline and syncline structure due to tectonic stress. The stress and strain characteristics of the five layers of rock mass are analyzed. Studies show that it takes the compressive stress 379 years to penetrate the overlying strata. The strongest penetrate path of the compressive stress …

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Method Of Power System Energy Storage Configuration Based On Flexibility Promotion, Weiqing Sun, Li Zhen, Yiming Tan, Fenglei Lü, Wenping Qiu, Hongzhong Li Jan 2019

Method Of Power System Energy Storage Configuration Based On Flexibility Promotion, Weiqing Sun, Li Zhen, Yiming Tan, Fenglei Lü, Wenping Qiu, Hongzhong Li

Journal of System Simulation

Abstract: To solve the problem of renewable energy access and aiming at system’s response capability to short-term uncertainty, power system flexibility and its evaluation index are defined. A method of energy storage configuration based on flexibility evaluation is proposed. The uncertainty from power supply is analyzed. Aiming at the uncertainty of renewable energy, a source flexibility evaluation index is defined. The principle and method of energy storage configuration are presented from the aspect of siting and sizing. The energy storage configuration model is created and solved considering both the system flexibility requirements and energy storage costs based on the …

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Optimization Design Of Fuzzy Energy Management For Plug-In Hybrid Electric Vehicles, Xiaolan Wu, Zhifeng Bai, Xiaohui Shi, Binggang Cao Jan 2019

Optimization Design Of Fuzzy Energy Management For Plug-In Hybrid Electric Vehicles, Xiaolan Wu, Zhifeng Bai, Xiaohui Shi, Binggang Cao

Journal of System Simulation

Abstract: Because of complex system configuration, it is difficult to find precise mathematics model of PHEV drivetrain. The fuzzy controller design depends mainly on expert’s experience and has much subjectivity. A fuzzy energy management strategy (EMS) based on particle swarm optimization (PSO) is presented. In this EMS, the fuzzy rules obtained from expert knowledge are unaltered and the PSO is used to optimize the parameters of membership functions of the fuzzy controller. The provided EMS model is built by Matlab/simulink and embedded in the Advisor software for simulation and comparative analysis. The result shows that, compared with the conventional …

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Apriori-Based Association Rule Algorithm And Its Application In Power Plant, Wencheng Huang, Jia Li, Daogang Peng, Li Wang Jan 2019

Apriori-Based Association Rule Algorithm And Its Application In Power Plant, Wencheng Huang, Jia Li, Daogang Peng, Li Wang

Journal of System Simulation

Abstract: The data mining technology for historical data of power plant has the problem of low efficiency as the data dimension is high and data size is large. Some parameters are set without theoretical guidance and the objective parameter value is not reasonably determined in the corresponding algorithm of data mining. A mining algorithm with improved quantitative association rule based on Apriori is proposed. Aiming at the economical operation of power plant, target guidance is used to constrain the dimension and compress the quantity in sample space, which improves the mining efficiency and determines the parameter’s target value reasonably. …

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Application Of Pwa-Based Safety Diagnosis Method In Cstr System, Yuhong Wang, Yang Pu Jan 2019

Application Of Pwa-Based Safety Diagnosis Method In Cstr System, Yuhong Wang, Yang Pu

Journal of System Simulation

Abstract: A safety diagnosis method based on piecewise affine (PWA) model is proposed for ensuring the safety of the petrochemical process. In the method, the petrochemical system is modeled in PWA form which can well describe the nonlinear and hybrid characteristic of the system. Then a formal verification algorithm based on reachable analysis is used to get reachable sets of system states according to the established model. It can predict whether the system is in danger or not in advance so as to take the corresponding measures to ensure the reliability and safety of the system. The proposed method is …

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Unsteady State Diffusion Of Pollutants During Cargo Compartment Fire, Yang Dong, Liu Zhen, Shibin Yang, Xiaozhe Sun Jan 2019

Unsteady State Diffusion Of Pollutants During Cargo Compartment Fire, Yang Dong, Liu Zhen, Shibin Yang, Xiaozhe Sun

Journal of System Simulation

Abstract: The transport of the pollutant gas and smoke in aircraft cargo compartment is investigated numerically on the occurrence of fire disaster. The analysis model based on the volume fire source is established. The 3D unsteady Navier-Stokes equations and transport equations are solved using finite-volume method. The distribution of the temperature is achieved and the unsteady transport principle of pollutant gases and the smoke is analyzed. Numerical results match well with the experiments results, which verifies the correctness of the numerical method. Results show that the ceiling spray behavior is observed when the thermal air is driven by the buoyancy …

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Nonlinear Characteristics Of Transmission System Of Shearer Cutting Unit, Dongsheng Zhang, Haiyang Yu, Jianbo Xu, Li Yan Jan 2019

Nonlinear Characteristics Of Transmission System Of Shearer Cutting Unit, Dongsheng Zhang, Haiyang Yu, Jianbo Xu, Li Yan

Journal of System Simulation

Abstract: The nonlinear dynamics model of gear transmissionsystem of shearer cutting unit is established. The nonlinear dynamics theory of gear is applied to the transmission system of shearer cutting unit, and the effect of damping ratio and vibration frequency on the nonlinear dynamics of the system is considered. Fourth order Runge-Kutta method with variable step is employed to solve the nonlinear systems differential equations. The phase plan and Poincare section of the system response are obtained with different parameters. The results show that the nonlinear influence of the displacement response of the solar wheel is stronger when the damping ratio …

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