刚体动力学问题的统一分析格式
郑慧明
(华中科技大学 力学系,湖北 武汉 430074)
摘要:基于自由度和达朗贝尔原理,提出了分析刚体动力学问题统一格式。自由度决定了所需列动力学方程的数目,而应用达朗贝尔原理将力学问题转化为静力学问题后,可对一个或多个刚体对任意点取矩,在很多情形下可以不引入不需求的未知力。将二者结合,便可确定动力学问题至少需列动力学方程的数目,并能有规律地得到所需静力学格式的方程,从而建立采用达朗贝尔原理分析刚体动力学问题时的统一格式。
关键词:自由度;达朗贝尔原理;刚体动力学
中图分类号:O313.3 文献标志码:A doi:10.3969/j.issn.1006-0316.2018.01.005
文章编号:1006-0316 (2018) 01-0024-05
Uniform Format of Analysing Rigid Dynamics Problem
ZHENG Huiming
( Mechanics Department, Huazhong University of Science And Technology, Wuhan 430074, China )
Abstract:A uniform format is proposed in tackling dynamical problems of rigid bodies based on degree of freedom(DOF) and D'Alembert's principle.The necessary number of dynamics equations depends on DOF.Applying D'Alembert's principle, dynamical problems can be transferred into statics problems which helps us establish statics moment equilibrium in an arbitrarily point.Therefore,the unrequested unknowns are not introduced in most cases. Combining DOF and D'Alembert's principle,one can know the least necessary number of dynamics equations and regularly find statics format equations to establish a uniform format in solving dynamical problems of rigid bodies.
Keywords:degree of freedom;D'Alembert's principle;rigid body dynamics
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收稿日期:2017-05-19
作者简介:郑慧明(1968-),男,湖北蕲春人,博士,副教授,主要从事振动和耦合动力学方面的研究和教学工作。
 

 

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