APPLICATION OF MECHANICAL IMPEDANCE IN VIBRATION ANALYSIS

In the network of a mechanical system,force F and velocity V are related by mechanicalimpedance Z as:Z=F/V.In this paper,we are going to discuss two cases:①Z=0,which gives the frequency equation of the system.We shall use this equation tosolve some practical examples;②Z=∞,which can serve as the design criterion of dynamic dampers.     

SELECTION OF STATE VARIABLES AND CONSTRUCTION OF STATE EQUATIONS

In modern control engineering and simulations,it is perferable to get the governing equationsby an easier way,so that state equations have been widely used.There are many rules to select statevariables,but the uses of these rules may have different forms of limitations and exceptions,yet afully argumented bond graph can be processed in proper way to select the state variables and toyield the state equations.The state variables are usually related to the energy-storing elements.State equations can easily be derived from bond graph by means of constitutive relations and struc-tural relations.     

新型多臂开口机构动力学

本文对新型多臂开口机构进行了动力分析。作者取摆动滑块为动参考系,导出了凸轮-导杆机构的相对运动关系式,并用间接法找到该高次方程的解。对于六连杆机构的非线性方程组求得其数值解。对整套机构建立动力学方程,并得到相应的结果。     

键图在动力学上的应用

本文简要地阐述了键图(Bond graph)的基本原理,论述了键图理论与余能原理间的相同处,键图在碰撞与振动分析(有限自由度,近似计算与非线性)中的应用.     

拉氏方程与键图在机电系统动力学上的应用

本文首先讨论并对比了拉氏方程与键图在机电系统动力学上应用的两种不同形式。并提出了:①关于运用 AFS 形式时非保守广义力(或广义电动势) E_i 与键图间的关系;②机电综合系统中计算广义力(或广义电动势)E_(?)的改进方法。本文的论述将使拉氏方程与键图应用于工程实践时更觉方便,物理概念更为清晰。     

ANALOGY BETWEEN TRANSFER MATRIX AND BOND GRAPH IN VIBRATION PROBLEMS

In this paper we have disucced the analogy between transfer matrix and bond graph, chiefly asfollows: ① Power or energy flow is their common characteristic, ② Lumped masses and elasticmembers in transfer matrix just correspond respectively to the inertia and the capacitance elementsin the bond graph, ③ Point transfer matrix and field transfer matrix behave respectively as 1-and0-junction in bond graph,     

平面连杆机构的动平衡——三十年来研究动向综合报道与评论

本文首先回顾了平面连杆机构动平衡问题研究的发展情况,然后介绍了关于震动力及震动力矩的几种主要分析方法,以及动平衡的条件。     

凸轮机构振动分析

本文分析了当凸轮轴具有弹性变形时,单自由度与多自由度时凸轮从动体系统的振动。先建立键图。然后由键图理论出发,以凸轮位移(速度)作为输入变量,找出状态变量,列出状态方程,建立框图。对于单自由度还分析了当凸轮位移规律为(1)等加速度;(2)简谐运动;(3)摆线运动;(4)三次方多项式时由于振动使从动体质量块所具有动量的附加项(即实际与理论动量之间的偏离),所用的方法为拉氏变换。对于多自由度则说明了求各传递函数的途径。     

弹力丝机增速轮轴的动力学分析

本文利用传递矩阵法在考虑轴的转动惯量和剪切变形影响的情况下,对弹力丝机增速轮轴的临界转速作了研究。另一方面计算了高速转动的增速轮的变形,考虑了温度的影响。     

VECTOR BOND GRAPH REPRESENTATION OF FINITE ELEMENT METHOD IN STRUCTURAL DYNAMICS

In this paper we have shown that the invariance of energy(kinetic energy,potential energy)and virtual work is the common feature of vector bond graph and finite element method in struc-tural dynamics.Then we have discussed the vector bond graph representation of finite elementmethod in detail,there are:(1)the transformation of reference systems,(2)the transformation ofinertia matrices,stiffness matrices and vectors of joint force,(3)verctor bond graph representationof Lagrangian dynamic equation of structure.