Advanced Materials Research Vols. 562-564

Abstract: To meet control requirements of different vibrating frequency output, a new kind of motor speed control method which is the RS485 communication control mode of inverter and PLC has been developed in the seismic simulation platform, the design methods of hardware and software are presented.

Abstract: The tunnel excavation and support process were simulated by using ANYSY. Firstly, support effects were studied on different modes of support. Secondly, numerical simulation was realized by using the function of APDL parametric design language in ANSYS. By discussing the different support effects which were arrived through changing support parameters and geometric parameters, conclusions and recommendations were put forward. At last, it could be clearly seen that the simulation results were in good agreement with the monitoring records.

Abstract: With the development of electronic technology, computer and networked communication technology, control system is speeding up from close and centralized architecture to being open and distributed, to satisfy the continuous developing requirement of control quality and management. Networked control system is gradually formed in the process, and soon become one of the most important domains of control technique. One of the research of networked control systems is the effect of network upon control systems .A simulation platform of networked control systems is designed for this purpose. Matlab is used to build models of real systems. The simulation platform gives good environment for the analysis and design of networked control systems.

Abstract: In this article, the Pro/Engineer virtual prototyping technology is used for three dimensional entity modeling, assembly, and simulation analysis of 1000KN·m large backstop in four design plans to confirm the integrity and assembling of backstop. By using the ANSYS/LS-DYNA software, it makes numerical simulation analysis of the backstop in non-return process, and through the analysis comparison to the simulation result, it obtains the optimization design plan of the 1000KN·m backstop.

Abstract: This paper deals with the autonomous soft landing of unmanned helicopter aiming to enhance its application. Soft landing means to reduce the shock force upon ground during the helicopters land. Helicopter is a multi-input multi-output system and for which optimal control provides graceful and coordinated controls. Firstly, the experimental platform configuration for autonomous soft-landing system is introduced, which is based on the model helicopter. The time-varying gains and time-varying quadratic performance index Linear Quadratic control for autonomous soft landing of miniature helicopter is applied to unmanned helicopter. Simulation shows that the outputs of the system can respond the input signals accurately.

Abstract: The deformations of an airborne waveguide slot array antenna and its positioner will finally influence the electromagnetic performances. Due to the complexity of the antenna and its positioner, effective simplification methods have to be taken for their mechanical - electromagnetic analyses. This paper describes the modeling and analyses of a complex airborne antenna positioner. The simplification method proposed not only keeps the structure features fairly exact, but also keeps the antenna to be exact enough for further deformed electromagnetic performance analyses. The modal analysis results of the whole system are close to the actual test results. It reveals that such simplification is reasonable and accurate.

Abstract: This problem that the study of conveyor belt performance majority still remain in the calculation of static characteristics, only a few studies on the dynamic modeling and simulating, Using Finite Element Analysis（FEA）,by ADAMS software establishing a model of the dynamic characteristics of conveyor belt, then the model is validated, the results show this method to establish the model is consistent with the characteristics of the theory, and can meet the requirements of the dynamic study.

Abstract: It is described that a parallel platform with three spatial degrees of freedom; the platform is built up by parallel combination of three symmetrical (SPS) and a branched-chain (PU). It is gotten the freedom of the mechanism and the theory expression of inverse kinematics by theoretical calculation. The mechanism was modeled by Pro/E, and the model is imported with Mech/Pro to ADAMS/View for simulation. The trajectory of three kinematic chains that changes over time through computer simulation, which are got by exerting force on the moving platform, is compared with the theoretical calculation results gotten through MATLAB. The results prove that the curve of position is identical, and it testifies the correctness of the movement of the platform.

Abstract: High level oil temperature is one of the most important factories for hydraulic system to breakdown. In order to improve ability of heat-radiation and control oil temperature within proper scope, new type oil tanks are required which are made up by plate-fin units. The analysis indicates that the new type oil tanks have a good natural ability of heat-radiation. To further enhance ability of heat-radiation, it should be fixed a fan in the bottom of the oil tanks, which can strengthen the ability of heat-radiation. With monitoring equipment, monitoring system can monitor the parameters of oil tanks in real time, and control the oil temperature within proper scope. Simulation experiments tell us some significant data.

Abstract: Aiming at the multiple input multiple output (MIMO) flight control system evaluation, put forward MIMO system stability margin definition, also put forward to get the MIMO system stability margin of the flight test method. The simulation results show that, the method is feasible.