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所谓平面复杂机构一般是指机构中有两个或两个以上没有固定回转中心即作平而运动的构件。对此机构进行速度分析和加速度分析往往遇到过多的未知量,用一般的图解法难于直接求解。目前“机械原理”教材对平面复杂机构的速度分析和加速度分析均采用特殊点法或综合运用瞬心法与相对运动原理法求解,思路仍显得较窄,本文将介绍试凑法和反推法,并进行初步的分析讨论。一、速度分析 1.试凑法我们通过具体的实例说明此法的基本原理。例1,图1(a)所示为一六杆机构,滑块E的速度(?)_E已知,试求此机构在图示位置时的速度多边形。
The so-called complex plane of the general mechanism refers to the organization has two or more without a fixed center of rotation that is composed of movement. To this institution, speed analysis and acceleration analysis often encounter too many unknowns, and it is difficult to solve directly with the general graphic method. At present, the textbooks of “Principles of Mechanics” use the special point method or the integrated method of instantaneous center of motion and relative motion principle to solve the speed analysis and acceleration analysis of the plane complex mechanism, and the idea is still narrow. This article will introduce the trial and error method and the backstepping method , And conduct a preliminary analysis and discussion. First, the speed analysis 1. Tried to practice We illustrate the basic principles of this method through specific examples. Example 1, Figure 1 (a) shows a six-bar mechanism, the slider E speed (?) _ E is known, try this mechanism in the position shown in the speed polygon.