复杂的机构

In this paper,a new method is proposed to analyse the motion of plane methanism by means of complex polar coordinates vector method.

1〕本文提出用复数—极坐标矢量法来分析平面机构的运动，其优点在于分析问题时概念清晰，运算简便，且机构运动愈复杂，优越性愈明显，也为使用电子计算机编制程序提供方便。

Mathematic model of double four-bar mechanism is very complex,so its speed and acceleration is always the difficult points of the research.

双四杆机构因其数学模型复杂，其速度和加速度曲线一直是研究的难点。

Combining the homogeneous matrix transformation theory of space mechanism and computer graphics, we raise the general principle and motion simulation's method of complicated mechanism, which is represented by spacial multipole structure of open chain.

通过将空间机构学齐次矩阵变换原理和计算机图形学原理相结合，提出了以空间多杆开式链机构为代表的复杂机械系统运动三维图形仿真的一般原理和方法。

At this June 1937 convention, President Newsome outlined a course for SAA which has been followed to the present day:"to become the practical self-help agency of archivists for the solution of their complex problems" and "to strive to nationalize archival information and technique;" to seek "the solution of archival problems involving external relations with all archival agencies, with learned societies, and with the public;" and "to encourage the development of a genuine archival profession in the United States" in which SAA would set training standards and advance archival administration through its meetings and publications.

1937年6月在这个公约，总统纽森勾画了Shuaiba地区管理局课程，一直沿用至今："成为实际自助为他们解决复杂问题的档案机构"和"努力档案信息和国有化技术；"，求"所涉及的所有档案机构的外部关系，档案问题的解决方案，学术团体，并与公众；"和"鼓励了真正的美国档案界的"发展中，Shuaiba地区管理局将设置通过会议和出版物的训练标准，推进档案管理。

The motion law of impact mechanism in hydraulic rock drill is very complicated, which is very difficult to be described with a precise mathematical model.

液压凿岩机冲击机构的运动规律十分复杂，很难用数学模型精确描述。

A kind of concise nalytic-graphic approach for singular position analysis of complex multilooped planar mechanisms was put forward,I.e,firstly,let the mechanism be deconposed into basic kinematic chains,then deduce the singularity conditions of these BKC and lastly determine the singular position of the mechanism from the corresponding singular geometric figure.

提出了复杂多环路平面机构奇异位置分析的一种简明的分析图解方法，即先将机构分解为基本运动链，再导出基本运动链的奇异性条件，后由其相应的奇异几何图形，解出其机构的奇异位置。

But the researches on vibration characteristics of motor-driven elastic linkage systems have shown that the dynamic responses of linkage systems are nonlinear and multi-modality. They may bring some nonlinear vibration, such as superharmonic resonances, subharmonic resonances, multiple resonances, and combination resonances, under some circumstances.

然而，弹性连杆机构的非线性振动特性研究表明，机构的动态响应特性十分复杂，并且在一定条件下会产生超谐共振、亚谐共振、多重共振、组合共振等非线性振动行为，这些共振就会对以机构动态性能为目标的优化设计产生重要影响，而使优化设计工作常常只能得到一个局部最优值，甚至只是一个比初始设计略微好些的设计点。

To pre-estimate the formability of complex aircraft skin parts and simulate the whole deformation processes, a finite element simulation system-STRETCHFORM is developed to assist the manufacture according to the stretch-forming feature of skin parts.

针对飞机复杂蒙皮拉伸成形特点，基于静态隐式算法开发了复杂蒙皮拉形数值模拟系统STRETCH FORM。系统分为前置处理、核心求解和后置处理3个模块。介绍了系统各模块的主要功能以及机构运动、静态隐式有限元算法和接触搜索算法等关键技术理论。

Generally drilling pump's power transmission is conducted by crank-connecting rod which is working with variable movement under high pressure and has complex force at work.

钻井泵的动力传递一般都由对心式曲柄连杆机构实现，曲柄连杆机构在高压条件下做变速运动，受力极其复杂。

Article 25 Where a judicial authentication institution encounters any especially complex, difficult or special technical problem in the process of authentication, the judicial authentication institution may consult experts in a relevant specialized field who are not employed by this institution, but the final authentication opinions shall be issued by the judicial authenticators of this institution.

第二十五条司法鉴定机构在进行鉴定的过程中，遇有特别复杂、疑难、特殊技术问题的，可以向本机构以外的相关专业领域的专家进行咨询，但最终的鉴定意见应当由本机构的司法鉴定人出具。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。