共查询到20条相似文献,搜索用时 46 毫秒
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上海交通大学工程力学系科研近况报道姜楫上海交通大学工程力学系,上海200030上海交通大学工程力学系设有工程力学专业本科,固体力学、流体力学和一般力学三个博士点和硕士点,以及力学博士后流动站.1991年以来出版专著10部:《分析动力学》、《理论力学》... 相似文献
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对《力学》中的物体自由度进行多方面分析,以深化教学、提高学生正
确分析物理问题的能力.使用实际教学分析的研究方法,在《力学》范围内讨论自由度与坐标、
自由与约束的关系并得以下结论:
(1) 同一物体的自由度随其所在的``空间'不同而不同, 不因坐标系的选取不同而
异, 在同类参考系中不因参考系的动静而有别;(2)自由度遵循叠加原理.
讨论了质点系的总自由度及相关计算问题,并指出研究《力学》中自由度的意义. 相似文献
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Tibor Javor 《Experimental Mechanics》1968,8(4):171-176
The present paper deals with development and design of new methods utilizing Wiedemann's effect for determination of state of strain in building structures. Wiedemann's effect and some features of torsional strain of magnetic field are the basis of new experimental method. Especially the point electromagnetic strain gages using the effect of pure torsion of electromagnetic field to enable universal examination. For strain-gage measurements, almost all physical quantities are used which can be related to the variation in length of the structures. From the electric strain measurements, the most commonly used methods are the measurements by resonance-wire strain gages or by electric-resistance strain gages. In this paper, electromagnetic strain gages are discussed using the Wiedemann effect, and the author describes some new measuring equipment and his own suggestions and methods based on an application of this effect. 相似文献
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It is well known that the problem on nonseparating potential flow of an incompressible fluid about an array of profiles reduces to an integral equation for a certain real function, determined on the contours of the profiles of the array. As such a function one can take, as was done, for instance, in [1–5], the relative velocity of the fluid on the profiles of the array. For arrays of profiles of arbitrary shape it is necessary to solve the corresponding integral equation numerically. In the particular examples of the calculation of aerodynamic arrays that are available [1–3] the numerical methods used were based on the approximate evaluation of contour integrals by rectangle formulas. As investigations showed, sizeable errors arose thereby in the approximate solution obtained, these being especially significant in the case of curved profiles of relatively small bulk. In the present paper a method for the numerical solution of the integral equation obtained in [5] is proposed. The method is based on the replacement of a profile of the array with an inscribed N polygon, the length of whose sides is of the order N–1 and whose internal angles are close to . Convergence with increasing N of the numerical solution to an exact solution of the integral equations at the reference points is demonstrated. Examples of the calculation are given.Novosibirsk. Translated from Izvestiya Akademii Nauk SSSR. Mekhanika Zhidkosti i Gaza, No. 2, pp. 105–112, March–April, 1972. 相似文献
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