论文部分内容阅读
在气动凿岩机的方案设计方面,主要的知识源泉一直是采用过去的经验。本文描述了气动凿岩机的计算机设计方法以使设计者在实际制造之前能进行方案设计,计算值与实测值之差的精确度在10%之内。该模型还可用于消声器设计和需要的推进力及安装应力的计算。本计算机模型使用有限差分计算技术对给定活塞重量和几何尺寸的凿岩机建模,并计算出气道直径和长度、消声器尺寸和结构、内部摩擦力、钎杆规格及长度以及间隙漏气或漏损的影响。计算了从凿岩机或消音器中排出的压气波动范围,以此估算出排气噪声和消声器特性。用计算机模型获得的信息对已有的消声器进行了改进设计,并导致凿岩机性能的改进和排气噪声的下降。本文叙述了用推导出的气体流量和动量方程式的建模方法,绘出了计算和实测的凿岩机性能参数及工作腔压力关系的图表。所有计算机模型可应用于现有的计算机及算法语言,该程序曾转化成可应用于微型机的BASIC程序。这一工作是作者在科罗拉多州丹佛市G.D公司任总工程师的时候完成的。
In the design of pneumatic rock drilling machines, the main source of knowledge has always been the experience of the past. This article describes the computerized design of a pneumatic rock drill to allow the designer to plan the design before it is actually manufactured. The accuracy of the difference between the calculated and measured values is within 10%. The model can also be used for muffler design and required propulsion and installation stress calculations. This computer model models the rock drill with a given weight and geometry of the piston using finite-difference computational techniques and calculates the diameter and length of the airway, the size and configuration of the muffler, the internal friction, the gauge and length of the drill rod, and the leakage or leakage of the gap Impact. The range of pressure fluctuations exiting a rock drill or muffler was calculated to estimate exhaust noise and muffler characteristics. The information obtained from the computer model was used to improve the existing muffler and lead to the improvement of rock driller performance and the reduction of exhaust noise. This paper describes the modeling of the gas flow and momentum equations derived from the plot and plots the calculated and measured rock drill performance parameters and working chamber pressure. All computer models are available for use in existing computer and algorithmic languages and have been translated into BASIC programs that can be applied to microcomputers. The work was done by the author at G.D, Denver, Colorado as chief engineer.