论文部分内容阅读
虚位移、广义坐标、变分等概念在力学中的重要性是无须多讲的。由于学生在学习这些概念时的困难较大,所以有必要进一步研究这些概念的讲授方法。一、讲授虚位移等概念存在的问题1.关于虚位移的定义在理论力学教学中,常将虚位移定义为为约束所容许的任何无限小位移。这个定义有不足之处: (1) 定义中的“为约束昕容许”的含意很难直接被
The importance of the concepts of imaginary displacement, generalized coordinates and variances in mechanics is unnecessary. As students have more difficulty learning these concepts, it is necessary to further study the teaching of these concepts. First, the problem of the concept of transfer of imaginary shift 1 on the definition of imaginary displacement In the teaching of theoretical mechanics, often defined as virtual displacement for the constraint of any infinite small displacement. This definition has some shortcomings: (1) The meaning of “constraint for tolerance” in the definition is difficult to be directly