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Research On Simulation System Of 3d Orchid Flower Blossoming Process, Yanhuang Xu, Junfeng Yao, Baorong Yang, Qidi Wang, Yuzhen Sun
Research On Simulation System Of 3d Orchid Flower Blossoming Process, Yanhuang Xu, Junfeng Yao, Baorong Yang, Qidi Wang, Yuzhen Sun
Journal of System Simulation
Abstract: As the national flower of China, orchid has various kinds of types and shapes, and its bloom process has never been simulated before. A model library of orchid organs was established and a transformation algorithm with random-valued parameters was proposed based on the model library of orchid organs by studying botanical knowledge of orchids and taking orchids with different morphological characteristics as research subjects for virtual modeling. Different segmental transformations were respectively performed on each organ of orchids to simulate growth of the organs according to the growth law of orchids. Different examples for simulating different type of orchids …
Development Of A Virtual Reality System For Space Planning Simulation, Wenbo Yang, Yinhao Song, Zhao Xin
Development Of A Virtual Reality System For Space Planning Simulation, Wenbo Yang, Yinhao Song, Zhao Xin
Journal of System Simulation
Abstract: A virtual reality platform for space simulation was developed to simplify the implementation of weapon and based design. First, the architecture of the simulation system was described briefly; Second, based on the characteristics of space simulation platform, several key modules were introduced, including terrain real-time generation, analysis of space layout, and closest distance calculation. The terrain generation for space simulation platform was based on database management. The closest distance calculation was based on nearest neighbor k-d tree searching. In addition, a three-dimensional (3-D) model library, containing vehicles, test equipment, plant facilities, and other tools, was established for dynamic loading …
Motion Tracking System By Direct Fusion Of Rgb-D Camera And Micro-Imu Sensors, Zhang Yang, Xu Lin, Guangyi Sun
Motion Tracking System By Direct Fusion Of Rgb-D Camera And Micro-Imu Sensors, Zhang Yang, Xu Lin, Guangyi Sun
Journal of System Simulation
Abstract: Recently, low cost full Body Motion Tracking attracted tremendous attentions in the fields of Computer Vision and Automation. Single depth camera-and inertial-based motion tracking systems rapidly have become two primary options for small-business and individual consuming markets, due to their relatively inexpensive price and comparable performance. However, both depth camera-and inertial-based motion tracking systems have inherent disadvantages which cannot be eliminated theoretically and experimentally. For example, depth camera tracking mostly failed in the presence of occlusion while inertial sensor tracking usually suffered from drift errors. Therefore, a novel multiple-sensor fusion approach which seamlessly combined the data measured from a …
Soft Shadow Map Method For Exploration Scene Simulation Of Lunar Rover, Yang Cheng, Jianliang Zhou, Geshi Tang, Li Xie, Guangming Chen, Shushi Liu
Soft Shadow Map Method For Exploration Scene Simulation Of Lunar Rover, Yang Cheng, Jianliang Zhou, Geshi Tang, Li Xie, Guangming Chen, Shushi Liu
Journal of System Simulation
Abstract: Scene simulation technology has gained a vast range of application in many different fields, such as aerospace measurement and controlling, by displaying the mission process and flight status in 3D real-time graphics interactively, which provided a comprehensive and intuitive controlling platform. The lunar exploration has been implemented with unmanned lunar rovers to detect the environments of the moon. Tele-operation was adopted to control the whole process by making and sending detecting plan and programming to the rover, in which the position of the sun was the key constraint condition. An effective real-time soft shadow map algorithm was presented to …
3d Model Retrieval Based On Hand-Drawn Sketches, Dianhui Mao, Huanpu Yin, Haisheng Li, Cai Qiang
3d Model Retrieval Based On Hand-Drawn Sketches, Dianhui Mao, Huanpu Yin, Haisheng Li, Cai Qiang
Journal of System Simulation
Abstract: Currently, retrieve 3d models use hand-drawn sketch as query has become an active research field. In the Bag of Feature (BoF) framework, the granularity of the distinction and expression brought by the "hard clustering" is insufficient. To solve this problem, a new method was proposed: GALIF feature was extracted from each sketch and the set of view images of models. BOF was replaced by a feature coding based on “soft clustering”--Gaussian mixture model. A fast and effective manifold ranking algorithm was used to calculate the manifold similarity between images, giving the final retrieve results. The previous methods …
Discussion Of Integrating Biological-Chemical Hazard Simulation And Artificial Society Computational Experimental Platform, Sihang Qiu, Xiaogang Qiu, Bin Chen
Discussion Of Integrating Biological-Chemical Hazard Simulation And Artificial Society Computational Experimental Platform, Sihang Qiu, Xiaogang Qiu, Bin Chen
Journal of System Simulation
Abstract: Biological-chemical hazard once brought great loss to human beings, which encouraged people to develop a number of biological-chemical simulation models and corresponding simulation tools. However, influences of hazards to society were rarely considered in the past. By integrating biological-chemical simulation and artificial society computational experimental platform, it was feasible to assess hazard and analyze its social effects meanwhile, which efficiently assisted manager to estimate hazard risk and make decisions. Two methodologies of integration and a corresponding example were given.
Active-Combine-Passive Homing Trajectory Simulation And Accuracy Analysis For Anti-Torpedo Torpedo, Congshan Xiao, Huizhen Yang
Active-Combine-Passive Homing Trajectory Simulation And Accuracy Analysis For Anti-Torpedo Torpedo, Congshan Xiao, Huizhen Yang
Journal of System Simulation
Abstract: An active-combine-passive homing model was established based on mathematics model of relative motion and automatically-adjust-lead-angle method. A simulation method of working process was designed about the active-combine-passive homing and simulates the trajectory. The influence on the guidance accuracy caused by homing range, sector angle and active-homing cycle was analyzed by using Monte Carlo method. Simulation result indicates that active-combine-passive homing owns a high level effect of interception, the guidance accuracy can be effectively improved by increasing homing range and homing sector angle and decreasing the active-homing cycle.
Group Decision Making Model For Weapon Selection Using Extended Vikor Method Under Intuitionistic Fuzzy Environment, Shanliang Yang, Wang Peng, Li Ge, Kedi Huang
Group Decision Making Model For Weapon Selection Using Extended Vikor Method Under Intuitionistic Fuzzy Environment, Shanliang Yang, Wang Peng, Li Ge, Kedi Huang
Journal of System Simulation
Abstract: With respect to weapon system selection problem, in which attribute weights are completely unknown and attribute values are expressed with linguistic information, a multi-attribute group decision-making method based on extended VIKOR was proposed. The intuitionistic fuzzy weighted averaging (IFWA) operator was introduced to aggregate all the individual decision-making information in order to obtain the intuitionistic fuzzy decision matrix. The intuitionistic fuzzy entropy method was utilized to obtain the objective weights of evaluation criteria. The alternative weapon systems were ranked according to the basic concept of extended VIKOR method. A case study of air-to-ground guided missile selection problem for UCAV …
Research On Attitude Controller Based On Modified Adaptive Robust Sliding Mode In Low-Flying, Yunjie Wu, Chuang Song, Jingxing Zuo
Research On Attitude Controller Based On Modified Adaptive Robust Sliding Mode In Low-Flying, Yunjie Wu, Chuang Song, Jingxing Zuo
Journal of System Simulation
Abstract: Regarding inertia uncertainties, external disturbances and severe nonlinear coupling factors among the three channels including pitching, yawing and rolling at low-flying, controller design of wide adaptability could quickly and precisely realize the spacecraft attitude tracking control in a limited time. Based on the nonlinear model of the aircraft attitude, a kind of modified controllers was designed based on a robust adaptive sliding mode controller in the finite time convergence among three channels, the controller is continuous and differentiable. The adaptive controller was improved to stop a large controller output. Simulation results show that the designed attitude controller can …
Control System Design Based On Integral Sliding Mode Of Quadrotor, Zengqiang Chen, Chenlu Wang, Li Yi, Zhang Qing, Mingwei Sun
Control System Design Based On Integral Sliding Mode Of Quadrotor, Zengqiang Chen, Chenlu Wang, Li Yi, Zhang Qing, Mingwei Sun
Journal of System Simulation
Abstract: A double closed-loop control system based on integral sliding mode was proposed to solve the problems of position and attitude control of an under-actuated, nonlinear coupling quadrotor model. An integral sliding mode control method was applied in the inner loop attitude control and a PID controller was designed in the outer loop position control. Due to the under-actuated property of the quadrotor model, desired pitch and roll angles were given by outer loop controller. The stability of the designed control system was proved by Lyapunov stability theorem. Simulation results on Matlab show the effectiveness of the proposed control system …
Process Model Of Complex R & D Project Based On Design Structure Matrix, Baosen Yang, Kejun Zheng, Lai Ling
Process Model Of Complex R & D Project Based On Design Structure Matrix, Baosen Yang, Kejun Zheng, Lai Ling
Journal of System Simulation
Abstract: Since complex product R&D project is characteristic with more stochastic factors, a process model was established for complex product R&D project. The model made a comprehensive description of complex information dependencies between activities, timing between the upstream and downstream, feedback iterative relationship, parallel overlapping relationship, constraints and process parameters (time parameters, cost parameters, rework probability, rework impact, learning curve, etc.) by multi-view approach. Some case studies were proposed in detail to illustrate the modeling process. This provides new ways and means of the simulation for the complex product R&D project risk analysis.
Soft Sensor Of Concentration Of Sodium Aluminate Solution Based On Reduction Robust Lssvm, Rongling Sun, Xiaoshan Qian
Soft Sensor Of Concentration Of Sodium Aluminate Solution Based On Reduction Robust Lssvm, Rongling Sun, Xiaoshan Qian
Journal of System Simulation
Abstract: Taking into account of poor stability, radioactive, higher maintenance costs and lack of manual detection of serious lag issues for online testing instrument of sodium aluminate concentration, combined with the mechanism analysis of the evaporation process, selecting parameters that affect the concentration of sodium aluminate solution as the auxiliary variables, using weighted loss function of the least squares support vector machine (Least Squares Support Vector Machine, LSSVM), a robust soft measuring for the concentration of sodium aluminate solution was achieved. Schmidt method was used to simplify the matrix and reduce the computational complexity. Industrial process data simulation results show …
Modeling And Simulation Of Mooring System In Anchor Handling Simulator, Zhongxian Zhu, Yin Yong, Helong Shen
Modeling And Simulation Of Mooring System In Anchor Handling Simulator, Zhongxian Zhu, Yin Yong, Helong Shen
Journal of System Simulation
Abstract: Dynamics modeling and simulation of the mooring system are the key technologies in Anchor Handling Simulator (AHS), the model's quality and the visualization have great impact on the real-time, fidelity and immersed feeling in the scene simulation, and hence affect the quality of training on the anchor handling operation by using AHS. Based on the Lumped Mass Method the dynamics model of the mooring line was built up, and 4-order Runge-Kutta method was used to solve the model, and the computing speed could meet the demand on real-time; A model for the mooring line embedded in seabed soil was …
Vector Field Topology Analysis And Application In Visualization, Li Chao, Lingda Wu, Bin Zhao
Vector Field Topology Analysis And Application In Visualization, Li Chao, Lingda Wu, Bin Zhao
Journal of System Simulation
Abstract: Vector field topology analysis is an important tool of feature-based visualization of vector fields. As a frontier research of flow field visualization, topology analysis extracts the topological structures as vector fields' features, helps uses filter important data, and reduce the occlusion and visual cluster. Based on mathematical definitions related to vector field topology analysis, different methods were introduced along with their advantages and shortcomings, and a knowledge system of vector field topology analysis was well-established. The applications and significance of topology analysis were explored to play a greater role, and the combination with other visualization techniques was discussed …
Color Transfer Based On K-Means Clustering Algorithm And Region Matching, Ziying Zhang, Mingquan Zhou, Wuyang Shui, Zhongke Wu, Zheng Xia
Color Transfer Based On K-Means Clustering Algorithm And Region Matching, Ziying Zhang, Mingquan Zhou, Wuyang Shui, Zhongke Wu, Zheng Xia
Journal of System Simulation
Abstract: For color transfer between colorful images, we used K-means clustering to classify image pixels and we also proposed nearest region matching algorithm. This algorithm can avoid the problem that multiple regions matched to the same region, and it can get the best match results between the two images. Translate the color space from RGB to for the two images. Divide color image and luminance mapped shape image using K-means models into the same number of classes. Determine the relationship between regions of the two images using Euclidean distance and the nearest region matching algorithm. Complete color transfer from color …
Application Of Mutil-Level Fuzzy Algorithm In Ir Countermeasure Performance Integrated Evaluation, Li Fan, Geng Xu, Xiaojie Dong, Zehua Hong
Application Of Mutil-Level Fuzzy Algorithm In Ir Countermeasure Performance Integrated Evaluation, Li Fan, Geng Xu, Xiaojie Dong, Zehua Hong
Journal of System Simulation
Abstract: In order to improve the evaluation precision of countermeasure of IR guidance systems, a new method was proposed. The principle of multi-level fuzzy comprehension evaluation was analyzed, and a four level fuzzy comprehension evaluation was established. The result of the example under different simulation conditions shows its effectiveness.
Communication Model Modeling Method In Warfare Modeling And Simulation, Yuanfeng Li, Jianping Liu, Chengying Shi
Communication Model Modeling Method In Warfare Modeling And Simulation, Yuanfeng Li, Jianping Liu, Chengying Shi
Journal of System Simulation
Abstract: The limitation of the traditional communication model modeling methods was analyzed. On the basis of detailed analysis the requirements of communication modeling and simulation, the method of communication model modeling method was designed based on the communication effects. It shows how to represent communication asset and combines the input and output of the model with the simulation verification scenario to illustrate the validity and applicability of the communication model. This method can effectively solve the impact analysis of communication problem for operational effectiveness, saves development costs and supplies the reference method of C4ISR model in warfare modeling …
3-Dimensional Kinematics Simulation Of Gear Hobbing, Rongchuang Zhang, Wang Jun, Wang Bo, Wanshan Wang
3-Dimensional Kinematics Simulation Of Gear Hobbing, Rongchuang Zhang, Wang Jun, Wang Bo, Wanshan Wang
Journal of System Simulation
Abstract: To save inevitable modeling insufficiencies owing to the simplified modeling strategie, 3-dimensional kinematics simulation of gear hobbing based on solid modeling was developed. On the basis of the kinematic relationship and positional relationships between the hob cutter and work piece, the vector model of the gear hobbing motion based time-driven was put forward. Based on UG Secondary Development, geometrical model of hob tooth rake face and curvilinear model of hob tooth path were developed, and the swept geometric entity of the hob tooth was developed through the use of the combination of these two models. The intersection of …
Dynamic Simulation Of Single Abrasive Grain Cutting Tc4 Based On Sph Method, Wang Yan, Wang Shuai, Jianguo Liu, Xiong Wei
Dynamic Simulation Of Single Abrasive Grain Cutting Tc4 Based On Sph Method, Wang Yan, Wang Shuai, Jianguo Liu, Xiong Wei
Journal of System Simulation
Abstract: Considering the negative effects of mesh distortion on calculation accuracy in FEM simulation, a novel mesh free method named Smoothed Particle Hydrodynamics (SPH) method was employed to simulate the process of single CBN abrasive grain cutting TC4. Establishing a SPH model of TC4 workpiece and a FEM model of single abrasive grain with cutting edges similar to the real abrasive grain, the influences of cutting depth on grinding forces and chip formative process were studied systematically. The simulation results state that grinding forces enlarge with the increase of cutting depth, while grinding force ratio decreases. And TC4 chip formative …
Radar Countermeasures Simulation Factor Analysis Method Of Fidelity-Oriented, Guoliang Wang, Huanyao Dai, Xujian Shen, Zhou Bo
Radar Countermeasures Simulation Factor Analysis Method Of Fidelity-Oriented, Guoliang Wang, Huanyao Dai, Xujian Shen, Zhou Bo
Journal of System Simulation
Abstract: It is crucial to assess the fidelity of operational objectives simulation and complex electromagnetic environment building for designing a military simulation system. Traditional confidence, credibility, similarity are difficult to fully evaluate the entire system, and hard to focus. To solve the problem of fidelity analysis and evaluation of operational objectives and battlefield simulation environment building, the concept and content of simulation fidelity were analyzed to explore the factor analysis principle and hierarchical classification method, etc., taking radar group network confrontation as an example, and its level division structure was given. General principles and methods of radar countermeasure high-fidelity simulation …
Model Granularity Control Oriented Multi-Resolution Modeling, Huachao Mao, Gongzhuang Peng, Heming Zhang, Jiaxin Zhao, Minghui Li
Model Granularity Control Oriented Multi-Resolution Modeling, Huachao Mao, Gongzhuang Peng, Heming Zhang, Jiaxin Zhao, Minghui Li
Journal of System Simulation
Abstract: Multi-resolution modeling and simulation has been widely applied in various fields, but the current multi-resolution modeling and simulation methods cannot effectively, systematically and comprehensively address four key issues: resolution control, model consistency, information loss and cross resolution interaction. Addressing these four issues, Model Granularity Control Oriented Multi-Resolution Modeling was proposed. This modeling approach has two core modeling components: resolution state chart and resolution connecting bridge, the former is to use UML state diagram to control granularity changes triggered by cross-resolution interaction, human-computer interaction and resource optimization model, and the latter is to model the relationship between different resolution …
Motion Planning Algorithm Based On Overall Trajectory For Locomotion Of 6-Legged Robot, Zuhua Guo, Shenjiang Wang, Shijie Zhao
Motion Planning Algorithm Based On Overall Trajectory For Locomotion Of 6-Legged Robot, Zuhua Guo, Shenjiang Wang, Shijie Zhao
Journal of System Simulation
Abstract: A traditional motion planning method based on gaits is difficult to adopt to complicate nature terrain. In order to solve the problem, a planning algorithm based on overall trajectory was proposed. The basic unit of robot maneuver was a walking step. The proposed method was to estimate position of robot in the next moment along a given overall trajectory, and then to plan the joints’ trajectory of robot. In this algorithm, the motion of a single step was decomposed into two parts, the motion of moving robot body with support of legs and the motion of swinging legs forward, …
Spherical Qtm-Based Submerged Simulation System Of Sea Level Rise, Huaqiao Xing, Miaole Hou, Wang Lei, Xiaoyi Jiang
Spherical Qtm-Based Submerged Simulation System Of Sea Level Rise, Huaqiao Xing, Miaole Hou, Wang Lei, Xiaoyi Jiang
Journal of System Simulation
Abstract: Focused on the dynamic simulation of submerged area after the rise of sea level, key technical issues were discussed, such as data organization and scheduling in large-scale 3D scene, submerged area dynamic simulation based on the adjacent relations of QTM (Quaternary Triangular Mesh) grids. A submerged simulation system based on QTM was designed and developed using Visual C#3.0 programing language and Microsoft DirectX 9 graphic interface, and the overall structure and main function of the system were introduced in detail. Tianjin Binhai New Area was selected as study area for submerged area dynamic simulation under different sea levels …
Study Of Setting Up Simulation Platform Of Self-Adaptive Flight Control System With Self-Repair Function, Long Hao, Shujie Song
Study Of Setting Up Simulation Platform Of Self-Adaptive Flight Control System With Self-Repair Function, Long Hao, Shujie Song
Journal of System Simulation
Abstract: The frame and characteristic of self-adaptive flight control system with self-repair function for aircraft with thrust vector were studied. RHO optimal algorithm was used to realize online controller design. MSLS algorithm was used to realize online flight identify parameters. Global parity space method, sensor data fusion and probability theory were used to realize FDI algorithm. The simulation platform used to simulate self-repair function with aircraft control surface failure was developed using OOP language VC++6.0 and three-dimensional graphics language OpenGL. Simulations show that the control surface and flight aerodynamic parameter change with flying states in the flight movement …
Uav Takeoff Decision Based On Neural Network Model Of Takeoff Capability, Yongtao Peng, Yueping Wang, Xiaoting Wang
Uav Takeoff Decision Based On Neural Network Model Of Takeoff Capability, Yongtao Peng, Yueping Wang, Xiaoting Wang
Journal of System Simulation
Abstract: To enhance the safety in case of engine flameout failure, a new type of UAV takeoff decision based on neural network capacity model was proposed. Two capacity parameters of takeoff safety in case of engine flameout failure were defined, one is the maximum velocity for a safe takeoff and the other is the minimum velocity for a safe shut down. A calculation method based on iterative simulations for those parameters under multiple flight conditions was introduced. Double layer neural networks were used to model the relationship between flight conditions and the capacity parameters, to realize the compressive storage and …
Transient Analysis Of Metro Vehicle Auxiliary Inverter During Pantograph And Catenary Off-Line, Xiaobo Li, Wu Hao, Jiechen Xu
Transient Analysis Of Metro Vehicle Auxiliary Inverter During Pantograph And Catenary Off-Line, Xiaobo Li, Wu Hao, Jiechen Xu
Journal of System Simulation
Abstract: Pantograph and catenary off-line brings great harm to the safe and reliable operation of subway vehicles. The equivalent process during off-line and the off-line equivalent circuit of subway vehicles was proposed. Taking a metro vehicles powered auxiliary inverter system as an example, the off-line transient analysis was carried out, and a simulation test was conducted. As shown in the results, the useful signal during off-line greatly reduced in vehicle system and the harmonics of Insulated Gate Bipolar Transistor (IGBT) voltage was greatly increased. The questions about heat-resistant and insulation arose, which caused the inverter module to damage and greatly …
Simulation And Test Of Mold Transport Mechanism Of Multi Mold Cycle Production Line, Yanjun Xiao, Liu Rui, Haiping Song, Jing Ran, Lihu He
Simulation And Test Of Mold Transport Mechanism Of Multi Mold Cycle Production Line, Yanjun Xiao, Liu Rui, Haiping Song, Jing Ran, Lihu He
Journal of System Simulation
Abstract: A new mold transport mechanism was put forward. In order to verify its strength and stability, a three-dimensional model of the institution was established making structural static analysis. The model was simplified according to the results of static analysis and the critical load of the mould delivery mechanism was calculated. Then the buckling analysis of the simplified model and the original model was conducted. According to the simulation analysis of the total deformation nephogram, the stress nephogram, critical load and buckling mode, the strength and stability of the mold transport mechanism were verified. The stress concentration area and the …
Modeling Method Of Airborne Display And Control System Based On Meta-Model Features, Zhile Wang, Jungan Wei, Yu Hui
Modeling Method Of Airborne Display And Control System Based On Meta-Model Features, Zhile Wang, Jungan Wei, Yu Hui
Journal of System Simulation
Abstract: Analysed of the current integrated avionics display and control system simulation problems, discussed the system’s function, composition and the simulation design method detailedly. Proposed a reconfigurable modeling method of meta-model features according to the requirements of the simulator develop. Make full used of the feature extraction method meta-model theory, the various elements that make up the system and their relationship was classified and feature abstract and description reasonably, built the meta-model of display and control system. Created the display and control system’s graphic elements, characters and Human-computer interactive interface by GL Studio. Using object-oriented techniques to make reusable class …
Simulation Modeling And Analysis Of Strong Wind-Shear Detected By Airborne Radar In X-Band, Wang Lei, Wei Ming, Yang Tao, Liu Ping
Simulation Modeling And Analysis Of Strong Wind-Shear Detected By Airborne Radar In X-Band, Wang Lei, Wei Ming, Yang Tao, Liu Ping
Journal of System Simulation
Abstract: The fluid mechanics principle and the triangle harmonic function were used to establish a simple and high real-time typical strong wind-shear field model. The simulation data of wind field velocity in horizontal fan-shaped scanning mode and vertical scanning mode based on the parameter and detecting mode of airborne phase array weather radar was proposed. The different characteristics of strong wind shear detected by airborne weather radar on the different altitude were proposed through simulation data analysis. The simulation data credibility of strong wind shear field was analized based on weather radar velocity of a strong squall line process …
Comparison Of Microscopic On-Road Fuel Consumption Model Based On Vsp And Ln (Tad), Zhao Qi, Yu Lei, Guohua Song
Comparison Of Microscopic On-Road Fuel Consumption Model Based On Vsp And Ln (Tad), Zhao Qi, Yu Lei, Guohua Song
Journal of System Simulation
Abstract: In microscopic on-road fuel consumption models, the power demand-based parameter was commonly used to characterize the vehicle activities because of its strong correlation with fuel consumption. Both VSP and the natural logarithm of Ln(TAD) were commonly used power demand-based parameters. It is necessary to compare the accuracy and characteristic of two fuel consumption models that are developed based on the VSP with Ln(TAD). By collecting and processing field vehicle activities and fuel consumption data, two fuel consumption models for LDVs, one based on the VSP and another one based on Ln(TAD) were developed. Then, the distribution model between …