Abstract
Calculation of kinematic mechanisms is very time-consuming work. Due to the content of a large number of similar operations can be automated using computers. Forthis purpose, it is necessary to implement a software implementation ofthe mathematical model of calculation of kinematic mechanisms of the second class. In the article on Turbo Pascal presents the text module to library procedures all kinematic studies of planar lever mechanisms of the second class. The determination of the kinematic characteristics of the mechanism and the construction of its provisions, plans, plans, speeds and accelerations carried out on the example of the six-link mechanism. The beginning of the motionless coordinate system coincides with the axis of rotation of the crank AB. It is assumed that the known length of all links, the positions of all additional points of links and the coordinates of all kinematic pairs rack mechanism, i.e. this stage of work to determine the kinematics of the mechanism must be preceded by a stage of synthesis of mechanism (determining missing dimensions of links). Denote the coordinates of point C and considering that the analogues of velocities and accelerations of this point is 0 (stationary point), appeal to the procedure that computes the kinematics group the Assyrians (GA) third. Specify kinematic parameters of point D, taking the beginning of the guide slide E at point C, the angle, the analogue of the angular velocity and the analogue of the angular acceleration of the guide is zero, knowing the length of the connecting rod DE and the length of link 5, refer to the procedure for the GA of the second kind. The use of library routines module of the kinematic calculation, makes it relatively simple to organize a simulation of the mechanism motion, to calculate the projection analogues of velocities and accelerations of all links of the mechanism, to build plans of the velocities and accelerations at each position of the mechanism.
Highlights
The beginning of the motionless coordinate system coincides with the axis of rotation
It is assumed that the known length of all links
i.e. this stage of work to determine the kinematics of the mechanism must be preceded by a stage of synthesis
Summary
12*a22); Abx3 :=(bl*a22 - b2*a12)/znam; Aax2 := (a11*b2 - a21*bl)/znam; End; {Diada5v}. Задаём координаты точки С и учитывая, что аналоги скоростей и ускорений этой точки равны 0 (точка неподвижна), обращаемся к процедуре, вычисляющей кинематику группы Ассура третьего вида diada3v. Указываем кинематические характеристики точки D, принимая начало направляющей ползуна Е в точке С, угол наклона, аналог угловой скорости и аналог углового ускорения направляющей равными нулю, зная длину шатуна DE (звено 4) и длину звена 5, обращаемся к процедуре для группы Ассура второго вида diada2v.
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