1、外文翻译：Optimzation Design of Four-bar Linkage of Hydraulic Support Based on ADAMSAbstract-In designing a large inclined angle hydraulic support, the structure characteristics of four-bar linkage is presented, and ADAMS software is applied to four-bar linkage modeling and simulation. In order to attain
2、 optimal results, parameterized modeling and optimization is achieved, and the design results meets the practical requirements very well. By means of this virtual design method, the errors can be reduced and design efficiency canbe improved effectively. Keyword-hydraulic support; four-bar linkage; o
3、ptimization design; ADAMS 1. Introduction Four-bar linkage is one of the most important components of shield-type hydraulic support or chock-shield-type hydraulic support. Its function has two aspects:One, as the support legs rises or lowers, the leading edge of roof beam moves up and down nearly ve
4、rtically, thus maintaining a nearly constant unsupported distance between the coal wall and the leading edge of roof beam.This is a feature that is widely considered most desirable for good roof control. Second, it makes the support to be capable of bearing larger horizontal load. In designing of a
5、large inclined angle hydraulic support, optimization of the four-link design is an important work. The size of four-bar linkage directly influences the performance and status of hydraulic support. In the traditional four-bar linkage design, BASIC program is used to compute , but the results often ca
6、n not meet the design requirements and could not obtain the optimal solution. Currently, ADAMS software is more and more widely applied in the mechanical dynamics field . So, the paper makes use of the ADAMS software to model and simulate the four-bar linkage in order to achieve the optimal design s
7、olution. 2. Dimension calculation of four-bar linkage 2.1. Structure characteristics of four-bar linkage(1)When the hydraulic support rises from the minimal to the maximal height, as shown in Fig. 1, the leading edge of roof beam the maximal horizontal movement distance of the leading edge of roof b
8、eam should be less than or equal to 70mm, the best should be less than 30mm. (2) As shown in Fig. 1, P is the angle between roof beam and shield beam, Q is the angle between back link and horizontal line. P and Qshould meet the following requirements. When the support is in the highest position, P52
9、62, Q 7585. When the support is in the lowest position, tanPW . It is to make the rock fall down and prevent the rock stay in the shield beam according to frictional theory. If friction coefficient W of the steel and the rock is 0.3, P=16.7. For sake of the safety, P25 is suitable when the support i
10、s in the lowest position. It should have a distance between the bottom of back link and bottom plate, Q2530. (3)As shown in Fig. 1, is the angle between horizontal line and the connection line from the link point e1 the to instantaneous center O, e1 is the link point between shield beam and roof bea
11、m. In the support design, should meet the condition: tan 0.35 , because angle directly influences the additional force of support. 2.2. Calculating the dimension of four-bar linkage As shown in Fig. 2, H1 is the calculation height in the maximum position. Mathematically, the parameters of four-bar l
12、inkage is supposed that: ；1) The dimension calculation of rear bar and shield beam As shown in Fig. 2, if H1 is determined, the length of shield beam is: （1） The length of rear bar：（2） The distance between top link point of front bar and top link point of rear bar is: （3） The distance between top li
13、nk point of front bar and top link point of shield beam is: F =GB（4） The distance between bottom link point of rear bar and origin of coordinates is E1, as shown in Fig. 3. 2) The dimension calculation of length and angle of front bar Coordinate of b1 point When the support is in the highest positio
14、n H1 , the coordinate of b1 point is: (5)(6)Coordinate of b2 point When the support is in the lowest position H2 , the coordinate of b2 point is: （7） （8） When the support is in the lowest position,Q22530,according to the geometric requirements. Mathematically,it is supposed that Q2=25 （9）Coordinate
15、of b3 point When it is right-angle between shield beam and rear bar, the coordinate of b3 point is: （10） （11） （12） （13）Coordinate of c pointis the length of front bar. So the length of front bar can be calculated by use of the equation of circle. （14）The coordinate of c point is:（15）（16） The length and angle of front bar can be calculated after determining the coordinate of c point. 3) The calculation of the height D of the front bar bottom link point, and the projective distance E on the base between botto
