基于Hypermesh联合LS-DYNA的小径木采伐机构动力学分析

Kinetic Analysis of Small-diameter Tree Logging Mechanism Based on Hypermesh&LS-DYNA

介绍了一种新型履带式小径木择伐采伐机,采用Solid Works软件对该机进行三维建模,并进行了各部件的结构设计,如推倒机构、切口铣削机构、横切机构等。基于有限元方法,利用Hypermesh联合LS-DYNA对综合采伐机的主要工作部件横切机构的双圆锯片及推倒机构进行了工作过程的动力学分析显示。结果表明,在双圆锯片转速为5 000 r/min、进给速度为0.5 km/h的工况下,小径木最大等效应力发生在最先锯切处,其值为2.854 MPa;推倒机构弧形筋板接触应力的最大值为34.91 MPa,此时弹簧钢丝位移为58.1 mm。在此工况下可使小径木的倒向得到有效控制,符合该小径木综采机的工况需求。

A new kind of crawler-type small-diameter tree selective logging equipment is introduced in this article,with Solid Works used for the 3 D modeling of this equipment,structural design of each part carried out,including a push-over mechanism,an incision milling mechanism and a crosscutting mechanism. With the finite element method,using Hypermesh combined with LS-DYNA,explicit kinetic analysis of the working process of the main working components of the comprehensive logging equipment like the double circular saw blades of the crosscutting mechanism and the push-over mechanism is conducted. The simulation result shows that in the case of double saw blade speed of5 000 r/min and feed speed of 0. 5 km/h,the maximum equivalent stress of the log occurred where sawing happened the earliest,with its value being 2. 854 Mpa; the maximum contact force of the curved steel plate of the push-over mechanism was 34. 91 MPa,with the displacement of spring steel wire being 58. 1 mm at this point. Under such working conditions,the falling direction of small-diameter trees can be effectively controlled,in line with the requirements for the working condition of the comprehensive small-diameter logging equipment.