Synthesis And Analysis Of Multi-Bar Planar Linkages

With the return of the real economy as the main body of the manufacturing industry,the quality of industrial products and technological innovation has become the key point to seize the commanding heights of economic science and technology.The core of modern manufacturing development lies in the design,and the core of mechanical design in the manufacturing industry lies in the mechanism.The mechanism provides the effective theories and methods for the innovation and development of the machinery industry.The problem of synthesis and mobility of planar linkage have always been the ke y and difficult points of mechanism research.Based on the previous research results,this paper makes a more in-depth exploration and research on this problem,and try to put forward a more comprehensive and practical method to solve the problem of linkage synthesis.In addition,the mobility problem of typical planar multi-bar linkage is studied.The main contents of this paper are as follows:A more complete,practical and comprehensive synthesis method of planar linkage mechanism has been proposed.For the representative Watt-?,? type six-bar linkage and the four-bar crank-slider linkage as well as five-bar crank-slider linkage,the position synthesis,the function synthesis and the trajectory synthesis task are carried out respectively.The corresponding examples are given,which proves the feasibility of the proposed method.Based on the N-bar rotatability laws and the establishment of the vector loop equation,the single-degree-of-freedom four-bar crank-slider linkage and two-degree-of-freedom five-bar crank-slider linkage as well as Watt six-bar-? linkage are analyzed,respectively.By using Maple software,the branches of linkage identification diagram is obtained.It solves the problems of recognition including dead position identification,branch identification and full rotability identification.It is proved that the design of the mechanism is feasible and reasonable at the same time,to ensure that the mechanism to overcome and avoid discontinuous or reach the singularity and other issues in the course of movement,to complete the pre-set movement mode.The problem of cognate mechanism of planar linkage is studied.The cognate mechanism can satisfy the constraint of exactly the same trajectory generation,and expand the selection range of the scheme when we should solve the problem of linkage synthesis.In summary,this study attempts to establish a synthesis solution for multi-bar planar linkage.Completed three kinds of synthesis which are the location synthesis,function synthesis,trajectory synthesis.And the problem of the mobility of single-degree-of-freedom and multi-degree-of-freedom planar link mechanism is studied respectively.Including the continuity of the movement of the mechanism(branch),full rotation(crank condition),mobility conditions and other issues.