Papers by Keyword: Simulation

Abstract: In this paper we use elastic-plastic mechanics and air dynamic to establish the mathematical model of badminton flight trajectory and deformation, and use the ANSYS software to do simulation on badminton flight process, and obtain the flight path and deformation of badminton. In order to analyze the badminton four-dimensional space-time data, we establish the one-dimensional time measurement, and use one-dimensional time transient stress to establish flight trajectory and deformation, and design the four-dimensional space-time steady-state simulation process. Through calculation we eventually get the force of badminton flight process and deformation nephogram. Comparing four times results of numerical simulation results, the mathematical model of this design model meets the design requirements. It provides technical reference for badminton athlete's training and teaching.

Abstract: As one of the most important examples of human-orientated system, the exoskeleton can improve the strength and endurance of the wearer. The exoskeleton has multi-degrees of freedom. As a result, a stable controller for the exoskeleton is difficult to design. The adoption of a purely positional control strategy may lead to large contact forces. Hence, an admittance control strategy is devised aimed at limiting both internal and contact forces. To verify the rationality and feasibility of the control strategy, we introduce a method utilizing virtual prototype and collaborative simulation.

Abstract: A new optimum design process is established by mathematical model in this paper based on the theory of material mechanics and electricity. According to optimization,the conductive ring device is designed. Based on virtual modeling under abaqus, the simulation validation of experimental design is carried out.contact resistance is calculated under contact states. A series of data measured in simulation shows that this final optimum design of conductive ring has a better performance than the experimental design in physical properties.

Abstract: As an electric coupling sensor, the D-dot voltage sensor can achieve non contact measurement of voltage. With the advantages of simple structure, a high dynamic range and measurement bandwidth, it can meet the needs of accurate measurement^[1][2]. Thus it has great application prospects in voltage on-line monitoring, relay protection or other fields in the power system. This paper considered the operation of the three-phase lines, and established the D-dot voltage sensor simulation model in the simulation platform of Ansoft Maxwell 3D. With the simulation of the sensor working conditions, we can get the distributed parameters of the system under three-phase lines in operation, construct an equivalent circuit of measurement and analyze the simulation results to get a voltage signal of input and output. The simulation results show that, with the equivalent circuit simulation of the three-phase D-dot voltage sensor, if we improve electrode capacitance parameter, there will be a good linear relationship between the input and output.

Abstract: It is becoming a development direction to study green forming process in mechanical. The processing technology of machining deep hole in relative thin sheet is a kind of green mechanical processing technology in this paper. The process uses the friction between driller and workpiece and plasticity of workpiece to form hole. The new technological process not only saves material, but also saves man-hours, and the workpiece has a good piece of assembly. In this paper, the forming process of deep hole on thin sheet was simulated, and some effect factors of forming hole were studied, such as the stress, temperature and shape of forming area, etc. The forming simulation is proved to be feasible by the test in this paper. The study results are useful to improve the machining parameters, and laid a foundation for further research on forming deep holes process on thin sheet metal by friction heat.

Abstract: For any second-order system, so long as it can be proved that it can be controlled and observed, it can be arbitrary pole configuration. The article selects a typical second-order system, and the first the paper writes the block diagram of transfer function, and proves its controllability, and then carries pole assignment with it. The paper writes the transfer function based on pole assignment of equation, and then writes its hardware simulation diagram, finally validates by computer simulation software and hardware platform. The experimental results show that the dynamic characteristic of the system is obviously better than before pole assignment.

Abstract: For the PWM mode of BLDCM speeding, the paper presents a detailed analysis on five PWM modulations, and presents the six switches’ working waveforms, the motor armature voltage and current waveforms on different PWM modulations. The simulation results show that HPWM-LON mode can significantly reduce motor armature voltage harmonic component, and can create good condition for the motor running. So we choose the right speeding way of BLDCM which has very important practical significance for industrial and agricultural production.

Abstract: The diode uncontrolled rectifier or the phase controlled rectifier is widely used in conventional rectifier link, thus the conventional rectifier link on the grid inject a large number of harmonics and reactive power, and they cause a severe grid “pollution”. This paper starts from the basic principles of the PWM rectifier, then the paper discusses the topological classification of three-phase PWM rectifier in detail. Based on topological structure, the paper builds the mathematical model of three-phase stationary coordinate system and two-phase rotating coordinate system. Based on space voltage vector, the paper studies PWM control method in-depth and simulates in Matlab/Simulink. The correctness of the theoretical study of three-phase voltage source PWM rectifier system is verified by the simulation results.

Abstract: This study considers the problem of optimal allocation of a common resource in systems with parallel structure. The distinguishing feature of suggested approach is its applicability to models complicated by randomness and possible, but not essential near singularity of the constraint matrix, which commonly arises in systems with parallel processes. The essence of the method is that it finds solution by first solving a simpler problem with an “expanded” constraint set, and then implements a directed transition to the solution of the original problem. In completing these steps the method takes account of the stochastic nature of the allocated flows.

Abstract: Principles and applications of electricity are involved in an important professional foundation courses. MCU development capabilities, including hardware design and software programming skills are basic capacity. This paper introduces an application of Proteus simulation on SCM teaching. Proteus breaks the space limitations of traditional training room with time and space constraints. The use of spare time, as long as there is a computer in a place, it can be single-chip hardware design and software programming exercises for students to improve SCM integrated development capability, practical spirit, the spirit of innovation culture to build a convenient and flexible platform.