各种生产过程最优节能参数的存在性(英文)

研究表明,在诸多生产过程中可以优化输入的断裂能量,使加工能耗最小.以一个简单的中心断裂为例,当加截脉冲具有某种特定形态时,施加到样品上引发破裂的能量可以取一个显著的最小值.研究结果显示,优化各种与断裂有关的生产过程,使得能量消耗最小是可能的.这种优化的可能应用包括钻孔或岩石粉碎过程,此时能耗成本通常占生产成本的最大部分.上述方法可以预测钻孔或研磨机等的最优参数,从而大大降低生产成本.文章第二部分研究了接触作用条件下引发断裂的能量输入行为.考虑一个球型粒子冲击一个半空间靶的情形,接触导致的应力场可用赫兹解来估计.定义了断裂判据之后,即可确定引发断裂的球粒临界速度及相应的临界动能.该动能的大小依赖于加载的持续时间,并十分明显地存在一个最小值.据此可断定,存在一个动态冲击的能量最优模式.

Existence of Optimal Energy Saving Parameters for Different Industrial Processes

It is demonstrated that energy input for fracture in many industrial processes can be optimised so that the energy cost of the process is minimised.Using a simple example of central crack it is shown that for a certain shape of the load pulse energy transmitted to the sample in order to initiate the crack has a strongly marked minimum.Received results indicate a possibility to optimise energy consumption of different industrial processes connected with fracture.Possible applications include drilling or rock pounding where energy input often accounts for the largest part of the process cost.Using this approach it will be possible to predict optimal operational parameters for bores,grinding machines,etc.and hence significantly reduce the process cost.In the second part of the paper the behaviour of energy input for initiation of fracture in conditions of contact interaction is studied.It is considered that a spherical particle is impacting the half-space.Stress field created as a result of the interaction can be estimated using the Hertz solution. Threshold particle velocity(and,hence,threshold kinetic energy)corresponding to initiation of rupture in the half-space can be found once the fracture criterion is defined.It will be shown that the value of this energy does significantly depend on load duration and has a marked minimum.Existence of energetically optimal modes of dynamic impact is claimed.