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冲击式凿岩机噪声的一个重要来源是钎杆的弯曲振动,钎杆旋转的对称性不好,是造成弯曲振动的原因。在钎杆与凿岩机连接的一端和连接件的连接采用了较小间隙的紧密配合,可以改善许杆该端旋转对称的不良状况。然而,要改善钎杆接触岩石一端的不良状况却很困难。本文就传给钎杆的能量中有多少能量可能会转变成弯曲能量的问题,作了理论研究。作研究用的模型很简单——一根整体钎杆和代表岩石的响应并起偏心作用的粘滞性阻尼体,使用这一模型得出了研究结果是正确可靠的,这一点无庸置疑。研究结果表明:在典型的情况下,约有10%的入射应力波能量要变成使钎杆弯曲的能量。若钎杆使用可卸式钎头,则这种转变的比例或许要小些。尽管陡峭的波头往往导致更多的弯曲振动,但入射应力波的波型并不重要。使用质量较大的活塞,能减少转变为弯曲能量的比例
An important source of impact rock drill noise is bending vibration of drill rod. The symmetry of drill rod rotation is not good, which is the reason of bending vibration. The connection between the drill rod and the rock drill and the connecting part adopts the close cooperation of the smaller gap, which can improve the rotational symmetry of the rod. However, it is difficult to improve the poor condition of the drill rod contacting one end of the rock. In this paper, the energy transferred to the drill rod how much energy may be transformed into bending energy, made a theoretical study. The model used for the study was simple - a monolithic drill rod and a viscous dampening body that acted in response to the rock’s eccentricity. Using this model, it was clear that the results were correct and reliable. The results show that, under typical conditions, about 10% of the incident stress wave energy becomes the energy that bends the rod. If the drill rod to use removable drill bit, then the proportion of such changes may be smaller. Although steep wave tips tend to cause more bending vibration, the wave shape of incident stress waves is not important. Using a massier piston reduces the proportion of energy that is converted to bending energy