计算机编程在医学物理实验《转动惯量的测量》中的应用

通过对复杂的转动惯量计算过程进行程序化,并且利用条件判断实现对实验环节差错的识别,增强了学生对医学物理实验的兴趣,减轻了教师负担,提高了教学效率和效果,培养了学生解决实验问题的能力.     

Optimal design of Stewart platforms based on expanding the control bandwidth while considering the hydraulic system design

We proposed an optimal design method to expand the bandwidth for the control of large hydraulic Stewart platform. The method is based on generalized natural frequency and takes hydraulic oil into consideration. A Lagrangian formulation which considers the whole leg inertia is presented to obtain the accurate equivalent mass matrix. Using the model, the effect of leg inertia and the influence of design parameters on the generalized natural frequency are investigated. Finally, numerical examples are presented to validate and confirm the efficiency of the mathematical model. The results show that the leg inertia, especially the piston part plays an important role in the dynamics. The optimum diameter ratio of the base to the moving platform is between 2 and 3, and the optimum joint angle ratio of the base to the moving platform is about 1. The smaller joint angles and a longer leg stroke are favorable for raising system frequencies. The system oil should be preprocessed for large platforms with a requirement for good dynamic performance.     

一种发动机液力悬置动特性研究

基于流体力学理论,研究发动机液力悬置惯性通道内阻尼力,建立一种液力悬置力学模型和数学模型,进行动特性仿真,从流体力学的角度分析了液力悬置的结构参数对其动态特性的影响。     

三线摆测量刚体转动惯量及其误差分析

本文研究了三线摆法测量刚体转动惯量的误差影响因素并对误差的来源和原因进行了分析,在此基础上对实验操作提出了一些改进的方法,以提高实验的精度。     

粘度及流变性在实验教学中的应用

物理化学实验主要针对物质的性质进行表征,传统的粘度测定方法是用乌氏粘度计测定高聚物的粘度。为了增强专业特色,为了加强学生的综合素质、创新意识的培养,为了使实验更接近现代实验教学的要求,设计选用了先进的旋转粘度计测量物质的粘度及其流变性。     

刚体转动惯量测量的研究

在刚体转动惯量测量实验中,利用数字毫秒计时器计时,改进测量角加速度的原理和方法,大大提高实验的精确度和效率.     

基于MATLAB的复杂非线性控制实验系统实时控制研究

讨论了在Matlab环境下实时控制的两种实现方法，提出了模糊变量组合的模糊控制方法。采用基于M文件进行实时控制，具有简单易学、控制方便等特点，但运行速度稍慢；使用Simulink和RealTime Workshop进行实时控制，具有控制系统参数修改方便，运行速度快，在完成仿真和调试后可生成C代码并移植到硬件直接使用，使控制系统得以快速成形。在Matlab环境下采用通用的PCl数据采集卡和自行设计的光电编码信号采集卡．对实际的倒立摆系统和旋转伺服系统进行了有效地实时模糊控制。     

A Nonlinear Dynamical Theory of Non-Classical Plates

In this paper, a new nonlinear formulation of plates, including shear and rotatory inertia and transverse normal stress effects, is developed by means of general assumptions, of which the von Karman-type formulation and some thick plate theories are special cases. To keep the formulation fairly general, the problem addressed in this paper simultaneously includes: the effects of shear deformation according to the geometric deformation similarity of the cross-section, the rotatory inertia, and the transverse normal stress. The three-dimensional compatible equations are applied to derive the basic equations. Numerical results are given for linear and non-linear analysis of plates. This Work was supported by the Natural Science Fundation of Shanghai for Returning Scholars     

定点转动刚体打击中心研究

从刚体定点转动的动力学方程出发，推导定点转动刚体打击中心位置的普遍表达式，并通过特例加以应用。     

回转式电晕放电架的结构设计

电晕处理机是一种应用非常广泛的塑料薄膜表面处理设备,放电架是其主要组成部分。针对放电架结构的特点,介绍了一种放电架总体结构的设计方法,并对其主要组成部件的结构设计进行了详细的论述。这种放电架采用回转式结构,利用气缸推动回转组件运转,提高了放膜的方便性和安全性。