基于虚拟样机技术的大型煤粉筛运动学特性研究

Study on kinematic characteristics of large-scale powdery coal sieve based on virtual prototype technology

基于一定简化原则建立了某型煤粉筛力学模型及振动微分方程,并根据其振动微分方程在Matlab/Simulink中建立了该煤粉筛筛箱动态时域分析模型,对其运动学特性进行时域分析,得到了煤粉筛筛箱动态特性数值解;其次利用虚拟样机技术,通过三维建模软件Pro/E和多体系统动力学软件Recur Dyn,建立了该煤粉筛的虚拟样机模型,通过仿真分析获得煤粉筛工作状态下筛箱各测点的位移、加速度曲线,继而得到筛箱各测点轨迹图;最后对煤粉筛运动特性进行振动测试,将测试结果和仿真分析结果进行了对比分析。通过理论计算、仿真分析和现场测试三者结合验证了设计的合理性及所建模型的正确性,缩短了煤粉筛的研发周期,取得较好的经济效益。

The mechanical model and vibration differential equations of the powdery coal sieve are established based on certain simplified principles,and the kinematic time domain model of the sieving box of the powdery coal sieve is established with Matlab/Simulink according to the vibration differential equations.At first,the time domain analysis is carried out for the sieving box,and its kinematic characteristics numerical solution is obtained.Secondly,the virtual prototype model of the powdery coal sieve is established with three-dimensional modeling software Pro/E and multi-body system dynamic software RecurDyn based on virtual prototype technology.The displacement curve and the acceleration curve of each measuring point on the sieving box in operation conditions are obtained by simulation analysis,and then the motion trajectory of each point on the sieving box are obtained.At last,the kinematic characteristics of the powdery coal sieve are got through vibration testing,and the testing results are contrasted and analyzed with the simulation ones.In combination with theoretical calculation,simulation analysis and field testing,the rationality of the design and the correctness of the virtual prototype simulation model are verified.In addition,development cycle is greatly shortened and good economic benefits are achieved.