论文部分内容阅读
关于自由度的计算,已经引起了世界上许多学者的注意。本文提出了“根据机械系统的闭合特点,割断机架分析末杆运动,在同一瞬时把末杆与机架焊接,重新形成原机械系统”的理论,来计算机械系统(包括机构、结构)的自由度。本文阐明了机械系统中的静不定次数和自由度数的内在联系;为判断机械系统能否实现有限位移提供了必要性判据,同时为判定机械系统是否能作为结构提供了充分性判据;揭示了静不定和自由度的物理意义;严格地证明了把机构分成六个族是错误的,机构分族的观点是毫无意义的。根据上述理论,我们导出了闭合数计算公式、自由度数计算公式以及静不定次数计算公式。用这些公式可以毫无例外地按机械系统(包括机构、结构)的构造,正确地计算出它的自由度数和静不定次数。
The calculation of degrees of freedom has attracted the attention of many scholars in the world. In this paper, the theory of “closing the rod to analyze the movement of the rod according to the closing characteristics of the mechanical system, and welding the rod to the frame at the same moment to re-form the original mechanical system” is proposed to calculate the mechanical system (including mechanism and structure) Degree of freedom. In this paper, the inherent relationship between the number of static indecision and the number of degrees of freedom in a mechanical system is clarified. It provides necessary criteria for judging whether a mechanical system can achieve finite displacements, and also provides a sufficient criterion for determining whether a mechanical system can be used as a structure. The physical meaning of uncertainty and freedom; the strict proof of the division of institutions into six races is wrong, and the point of institutional division is meaningless. According to the above theory, we derive the closed number calculation formula, the freedom degree calculation formula and the static indefinite number calculation formula. With these formulas, it is possible to correctly calculate the number of degrees of freedom and the number of uncertainties according to the construction of a mechanical system (including mechanism, structure) without exception.