Study On Vibration Response Of Supporting Type Impacting-crushing-rock Roadheader

In order to improve the current situation of cutter tooth loss, driving speed slow, machine tonnage large, high cost, cutting economical poor and satisfy the mechanized need of rock tunneler in small and medium sized mines, the problem of develop a well-adaped, simple structure, work relable, service convenient rock tunneler was needed to solve.The paper is task partial content of supporting type impacting-crushing-rock roadheader which presidial of my tutor, and take part in the project work of overall structure scheme design and study the vibration response of supporting type impacting-crushing-rock roadheader is lucky tome.Structural composition, working principle of institutions and analyze the characteristic were introduced in outset of this article.In order to study the performance and explore response characteristics of vibration in vertical, longitudinal and lateral direction of the supporting type impacting-crushing-rock roadheader under random load, its dynamic models were built in three directions according to the theory of multi-body dynamics and the method of Lagrange. The corresponding virtual response was obtained by using pseudo-excitation method to construct virtual load. The random impacting load of the crushing hammer was analyzed and identified, and the vibration response of three parts in three directions was obtained by means of the simulation of Matlab/Simulink.The result shows that the amplitudes of different parts from maximum to minimum are as follows:the crushing hammer, the arm, the body in three directions. The amplitudes of same part from maximum to minimum are as follows:lateral, vertical and longitudinal which tend to the corresponding working condition of vibration, and it consistent with the actual situation. The analysis of displacement power spectrum shows that, the main source of the machine vibration is that hammer reaches the maximal displacement of low frequency close to its natural frequency. Compared the simulation results by using the method of control variables, one by one, changing the mass, stiffness, damping and the parameters of the arm length, find the influence of the changes of the above parameters for the vibration and provide a reference for improving the vibration. Finally, optimize the stiffness coefficient by using bacteria foraging optimization algorithm, and obtain the optimal value of minimum vibration of the roadheader within the scope of appropriate.