活动发射平台大摆杆机械结构与液压系统联合仿真研究

大摆杆是活动发射平台重要的组成部分,当摆杆快速摆开时,如果发生急停情况,将会对大摆杆液压缸及其管路、大摆杆结构及安装的连接器产生较大的冲击载荷.基于ADAMS和AMESim联合仿真的方法对活动发射平台大摆杆的运动过程进行仿真,主要分析急停工况下大摆杆上不同位置的角速度和角加速度,为大摆杆的设计和试验提供指导.     

基于ADAMS的滚珠丝杠式ISD悬架平顺性仿真研究

为解决Ⅰ型ISD悬架存在的惯容器"击穿"现象,提出Ⅱ型ISD悬架,以提高ISD悬架实用性能.基于Pro/E和ADAMS联合建模,通过ADAMS和MATLAB联合仿真,对滚珠丝杠式ISD悬架平顺性进行仿真分析.对正弦输入、随机路面输入和阶跃输入作用下的ISD悬架动态性能进行初步研究.结果表明:与传统被动悬架相比,提出的Ⅱ型ISD悬架可以有效降低车身垂直振动加速度.     

单钢轮振动压路机振动液压系统动态特性联合仿真

为研究实际压实工况下钢轮振动、振动液压系统压力和驱动扭矩随压实度变化的动态特性,利用ANSYS APDL建立柔性体路面模型,在Adams中进行钢轮-路面刚柔耦合动力学建模,通过AMESim与Adams建立单钢轮振动压路机振动液压系统联合仿真模型,进行不同压实度时的压实仿真。结果表明：仿真模型准确,随着压实度的增大,钢轮振动容易出现二倍频,发生跳振,振动液压系统平稳压力减小,起振时间缩短,驱动扭矩减小。     

电控正流量挖掘机分工况功率匹配研究

针对目前电控正流量挖掘机系统研究较少、空载时能量损失大、发动机与主泵功率不匹配以及节能控制效果不佳的问题,搭建基于AMESim和Simulink的挖掘机电液系统联合仿真平台,提出一种双变量泵的发动机-泵恒功率控制方法。通过样机仿真实验以及分工况功率匹配研究,验证搭建的电控正流量挖掘机系统的正确性以及分工况功率匹配的有效性。仿真实验结果表明：设计的仿真模型以及功率匹配策略表现良好,在仿真和实验中,不同的工况模式下均可以保证泵的恒功率特性,可以实现对发动机的功率控制,发动机功率可以得到充分利用。     

数字液压缸联合仿真与试验研究

以航天器转运平台使用的数字液压缸为研究对象,根据其结构特点和内部闭环控制原理,利用三维建模软件和ADAMS软件建立其多体动力学模型,利用AMESim软件建立其液压模型,并通过软件接口将液压模型集成到ADAMS环境中,从而实现了联合仿真。利用仿真模型,重点研究了数字液压缸的定位精度,并通过试验验证了模型的准确性。根据仿真及试验提出了通过调整输入脉冲量提高精度的方法,可以满足转运平台工作时的精度要求。同时还通过仿真发现,供油压力波动会导致活塞杆运行时的抖动,增大定位误差。     

Geographically distributed real-time digital simulations using linear prediction

Real-time (RT) simulator is a powerful tool for analyzing operational and control algorithms in electric power systems engineering. For understanding the dynamic and transient behavior of a power systems, significant RT computation capabilities are essential. A single unit of RT simulator has limited simulation capabilities. The most common way of augmenting simulation capability is using a bank of locally connected RT simulators. However, creating a large-sized bank of RT simulators involves significant financial investments and hence may not be feasible at all research facilities. Power and energy systems research facilities that use RT simulators are at diverse physical locations. In addition to RT simulators, research facilities around the world house an array of facilities with unique power, energy, and control systems for innovative research. To leverage these unique research facilities, geographically distributed RT simulation based on Wide Area Network (WAN) is required. Typical RT simulators perform simulations with time-steps in the order of milliseconds to microseconds, whereas data latency for communication on WAN may be as high as a few hundred milliseconds. Such communication latency between RT simulators may lead to inaccuracies and instabilities in geographically distributed RT simulations. In this paper, the effect of communication latency on geographically distributed RT simulation is discussed and analyzed. In order to reduce the effect of the communication latency, a Real-Time Predictor (RTP), based on linear curve fitting is developed and integrated into the distributed RT simulation environment. Two geographically distributed digital RT simulators are used to perform dynamic simulations of an electric power system with a fixed communication latency and the predictor. Empirical results demonstrate the effects of communication latency on the simulation and the performance of the RTP to improve the accuracy of simulations.     

Artificial bee colony based algorithm for maximum power point tracking (MPPT) for PV systems operating under partial shaded conditions

Artificial bee colony (ABC) algorithm has several characteristics that make it more attractive than other bio-inspired methods. Particularly, it is simple, it uses fewer control parameters and its convergence is independent of the initial conditions. In this paper, a novel artificial bee colony based maximum power point tracking algorithm (MPPT) is proposed. The developed algorithm, does not allow only overcoming the common drawback of the conventional MPPT methods, but it gives a simple and a robust MPPT scheme. A co-simulation methodology, combining Matlab/Simulink™ and Cadence/Pspice™, is used to verify the effectiveness of the proposed method and compare its performance, under dynamic weather conditions, with that of the Particle Swarm Optimization (PSO) based MPPT algorithm. Moreover, a laboratory setup has been realized and used to experimentally validate the proposed ABC-based MPPT algorithm. Simulation and experimental results have shown the satisfactory performance of the proposed approach.     

基于Pro/E与ADAMS管道机器人设计仿真

针对ADAMS分析能力强大、建模功能弱的特点,运用Pro/E创建机器人虚拟样机,基于Pro/E与ADAMS对机器人进行联合仿真。主要介绍了联合仿真技术,指出样机导入过程中需要注意的关键问题,利用接口模块Mechanism/Pro对管道机器人进行了联合仿真,研究分析了机器人在管道内的运动特性,并对弹簧预紧力与样机驱动轮直径进行了优化。仿真结果表明,所设计的管道机器人能够满足设计指标要求,其结论可作为研制管道机器人物理样机的理论依据。     

智能阀门定位器控制方法的研究

针对采用直行程气缸控制的阀门设计了智能阀门定位器。为研究其控制方法,采用AMESim/Simulink联合仿真,在AMESim中建立气动伺服阀控非对称缸的系统模型,以S函数的形式导入到模糊自整定增量式PID控制系统的Simulink模块中,得到气动伺服系统的响应特性。将有、无PID系统的响应特性进行对比分析,结果表明:模糊自整定增量式PID控制器可以改善气动伺服系统的响应性能,达到了调节精度高、调节速度快的目的。     

车辆临界稳定状态仿真研究

在虚拟样机软件下建立目标车型的15自由度的多刚体动力学整车模型,MATLAB／Simulink软件下建立目标车型理想状态下的参考模型一线性二自由度模型。通过联合仿真,以两模型中车辆的质心侧偏角和横摆角速度作为比较参数,分析目标车型稳定性状态。可得出目标车型在什么工况下进入临界稳定状态,为车辆结构参数合理性设计、车辆稳定性控制系统的开发提供理论基础。