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An operation optimization method of a fully mechanized coal mining face based on semi-physical virtual simulation 被引量:8
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作者 Hengbo Shi Jiacheng Xie +2 位作者 Xuewen Wang Juanli Li Xing Ge 《International Journal of Coal Science & Technology》 EI 2020年第1期147-163,共17页
A mathematical hydraulic support self-tracking model for three-machine cooperative mining is proposed to address low efficiency and difficulties in strategy evaluation of a fully mechanized coal face.The proposed mode... A mathematical hydraulic support self-tracking model for three-machine cooperative mining is proposed to address low efficiency and difficulties in strategy evaluation of a fully mechanized coal face.The proposed model uses the coordinates and traction speed of the shearer to calculate the frequency of the circular hydraulic support and realize the coordinated operation of the three-machine mining technology.A unity3d hardware-in-the-loop simulation experimental hearer and hydraulic support platform was used to validate the model of autonomous follow-up.The results indicate that collaborative control of coal mining allowed for an efficiency 3.76%higher than under automatic operation mode and 46.03%higher than under manual control;thus,The mathematical model provided an improved production efficiency of the fully mechanized mining face.The mathematical model also provides a more intelligent and reliable security support,and improves the intelligent level of hydraulic support follow-up control. 展开更多
关键词 semi-physical simulation Virtual reality UNITY3D Human-computer interaction Shearer traction speed
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Improved S Surface Controller and Semi-physical Simulation for AUV 被引量:2
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作者 吕翀 庞永杰 +1 位作者 李晔 张磊 《Journal of Marine Science and Application》 2010年第3期301-306,共6页
S surface controllers have been proven to provide effective motion control for an autonomous underwater vehicle (AUV).However, it is difficult to adjust their control parameters manually.Choosing the optimum parameter... S surface controllers have been proven to provide effective motion control for an autonomous underwater vehicle (AUV).However, it is difficult to adjust their control parameters manually.Choosing the optimum parameters for the controller of a particular AUV is a significant challenge.To automate the process, a modified particle swarm optimization (MPSO) algorithm was proposed.It was based on immune theory, and used a nonlinear regression strategy for inertia weight to optimize AUV control parameters.A semi-physical simulation system for the AUV was developed as a platform to verify the proposed control method, and its structure was considered.The simulation results indicated that the semi-physical simulation platform was helpful, the optimization algorithm has good local and global searching abilities, and the method can be reliably used for an AUV. 展开更多
关键词 S surface controller AUV MPSO semi-physical simulation
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Semi-physical simulation of AUV pipeline tracking 被引量:1
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作者 李晔 庞永杰 +1 位作者 张磊 张鸿皓 《Journal of Central South University》 SCIE EI CAS 2012年第9期2468-2476,共9页
Before the task of autonomous underwater vehicle(AUV) was implemented actually,its semi-physical simulation system of pipeline tracking had been designed.This semi-physical simulation system was used to test the softw... Before the task of autonomous underwater vehicle(AUV) was implemented actually,its semi-physical simulation system of pipeline tracking had been designed.This semi-physical simulation system was used to test the software logic,hardware architecture,data interface and reliability of the control system.To implement this system,the whole system plan,including interface computer and the methods of pipeline tracking,was described.Compared to numerical simulation,the semi-physical simulation was used to test the real software and hardware more veritably.In the semi-physical simulation system,tracking experiments of both straight lines and polygonal lines were carried out,considering the influence of ocean current and the situation of buried pipeline.The experimental results indicate that the AUV can do pipeline tracking task,when angles of pipeline are 15°,30°,45° and 60°.In the ocean current of 2 knots,AUV could track buried pipeline. 展开更多
关键词 autonomous underwater vehicle semi-physical simulation underwater pipeline tracking underwater sensor simulation underwater optical vision
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Studies on aeroservoelasticity semi-physical simulation test for missiles 被引量:15
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作者 WU ZhiGang CHU LongFei +2 位作者 YUAN RuiZhi YANG Chao TANG ChangHong 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第9期2482-2488,共7页
Missiles may be damaged when aeroservoelastic problem occurs,which is caused by the interaction of structure flexibility and flight control system.Because of the limit of wind tunnel test condition,numerical methods a... Missiles may be damaged when aeroservoelastic problem occurs,which is caused by the interaction of structure flexibility and flight control system.Because of the limit of wind tunnel test condition,numerical methods are mostly used in previous aeroservoelastic studies.However,series of assumptions and simplification on structures,aerodynamics and flight control systems are unavoidably introduced,and various nonlinear factors are also ignored,therefore,they result in considerable errors.A novel method called aeroservoelasticity semi-physical simulation test is proposed in this paper,which takes the flexible missile with control system as the test object.Vibration signals at several locations of the missile are measured by accelerometers,then corresponding unsteady aerodynamics is computed based on the fact that airflow at high Mach is nearly quasi-steady,and finally unsteady aerodynamics is exerted simultaneously by shakers at certain locations of the missile.The aeroservoelasticity semi-physical simulation test system can be constructed after the control system is closed.Open loop transfer function test and closed loop stability test are carried out in sequence.The test principle and method proposed in this paper are verified by the concordance between the results of numerical simulation and experiment. 展开更多
关键词 aeroservoelasticity semi-physical simulation unsteady aerodynamic aerodynamic derivative method SHAKER MISSILE
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Evaluation on safety performance of a millimetre wave radar-based autonomous vehicle 被引量:4
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作者 CHEN Ding NI Jin-ping +1 位作者 BAI Lang CHEN Da-chuan 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2020年第1期1-10,共10页
This paper presents a method using range deception jamming to evaluate the safety performance of the autonomous vehicle with millimetre wave(MMW)radar.The working principle of this method is described.Combined with a ... This paper presents a method using range deception jamming to evaluate the safety performance of the autonomous vehicle with millimetre wave(MMW)radar.The working principle of this method is described.Combined with a waveform edition software,an experimental platform is developed to generate a deceptive signal that contains false distance information.According to related theories and its principle,the configuration parameters of the experimental setup are calculated and configured.The MMW radar of evaluated vehicle should identify an objective when it receives the deceptive signal from the experimental setup.Even if no obstacle,the evaluated vehicle can immediately brake in order that its braking distance is measured.The experimental results show that the proposed method can meet the requirements of the safety performance evaluation for the autonomous vehicle with MMW radar,and it also overcomes some deficiencies of previous methods. 展开更多
关键词 vehicle safety evaluation braking distance measurement semi-physical simulation range deception jamming spurious echo generation
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Adaptive PID control system for an autonomous underwater vehicle 被引量:5
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作者 王波 Su Yumin Wan Lei Sun Yushan 《High Technology Letters》 EI CAS 2011年第1期7-12,共6页
The control system of an autonomous underwater vehicle (AUV) is introduced. According to control requirements of the AUV, a simple but practical adaptive PID control method is designed The semi-physical simulation ... The control system of an autonomous underwater vehicle (AUV) is introduced. According to control requirements of the AUV, a simple but practical adaptive PID control method is designed The semi-physical simulation is done to test the feasibility of the control system. The neural network idea and the structure of PID controller are referred to design the adaptive PID controller. An intelligent integral is introduced to improve control precision. Compaed with traditional PID con- trollers, the adaptive PID controller has simple structure, good online adjusting ability, fast convergence and good robustness. The simulation experiments also show that the adaptive PID control system has high precision and fine antijamming ability. 展开更多
关键词 autonomous underwater vehicle AUV) control system adaptive PID control semi-physical simulation
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THEORETICAL AND EXPERIMENTAL STUDY ON THE PRESSURE AND VACUUM CONTINUOUS CONTROL SYSTEM BASED ON HYBRID PUMP 被引量:3
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作者 LI Jinyun DU Jingmin FU Xiaoyun LI Baoren 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第6期74-78,共5页
A novel pressure and vacuum continuous control system, which adopts a hybrid pump as pressure and vacuum source, is presented. The mathematical model of the system is developed. The theoretical simulation and analysis... A novel pressure and vacuum continuous control system, which adopts a hybrid pump as pressure and vacuum source, is presented. The mathematical model of the system is developed. The theoretical simulation and analysis on the system are implemented in order to study the relationships among the characteristics, parameters and working points of the system. The experimental investigations on the system characteristics are presented with the adoption ofa fuzzy-PID controller. The simulation and experimental results indicate that the pressure and vacuum continuous control system based on hybrid pump has good dynamic and static performance, strong robustness and satisfactory adaptability to various system parameters. According to the results, system can successfully gain high accuracy and fast response signal. Also, the mathematical model of system is also testified by the experimental results. 展开更多
关键词 Hybrid pump Pressure and vacuum continuous control Fuzzy-PID control semi-physical flight height simulation
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Fault tolerant attitude control of under-actuated spacecraft:Theory and experiment 被引量:3
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作者 Zejun ZHANG Hao YANG Bin JIANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第5期465-474,共10页
This paper investigates fault tolerant attitude control theory and experiment for underactuated spacecraft with one reaction wheel completely broken and two others suffering actuator faults of partial loss of effectiv... This paper investigates fault tolerant attitude control theory and experiment for underactuated spacecraft with one reaction wheel completely broken and two others suffering actuator faults of partial loss of effectiveness or bias.A non-smooth robust adaptive fault tolerant control law is proposed under the zero-momentum and input saturation conditions.It shows that the available reaction wheels need to produce sufficient control torque for the fault tolerance.Such a new control method is implemented in a semi-physical simulation system of an air-bearing platform.Experimental results show the effectiveness of the proposed method in spacecraft practical engineering. 展开更多
关键词 Actuator fault Air-bearing platform Fault tolerant control semi-physical experiment Under-actuated spacecraft
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Phenomenological Based Soft Sensor for Online Estimation of Slurry Rheological Properties 被引量:1
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作者 Jenny L.Diaz C. Diego A.Munoz Hernan Alvarez 《International Journal of Automation and computing》 EI CSCD 2019年第5期696-706,共11页
This work proposes a soft sensor based on a phenomenological model for online estimation of the density and viscosity of a slurry flowing through a pipe-and-fittings assembly(PFA). The model is developed considering t... This work proposes a soft sensor based on a phenomenological model for online estimation of the density and viscosity of a slurry flowing through a pipe-and-fittings assembly(PFA). The model is developed considering the conservation principle applied to mass and momentum transfer and considering frictional energy losses to include the variables directly affecting slurry properties. A reported proposal for state observers with unknown inputs is used to develop the first block of the observer structure. The second block is constructed with two options for evaluating slurry viscosity, generating two possible estimator structures, which are tested using real data. A comparison between them indicates different uses and capabilities according to available process information. 展开更多
关键词 Soft sensor phenomenological based semi-physical model non-Newtonian fluids unknown input observer slurry flow
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