Abstract
Designing the no-dig impactor by the method of anology, experience and actual test, it had a large cost and long-time cycle, and was hard to achieve the optimization. In order to research intensively the impactor work mechanism and describe piston movement laws in detail, a physical model was established according to the actual conditions, finite difference method was adopted, thermodynamics and kinematics were applied. Using object-oriented programming, the no-dig impactor computerized simulation software was developed whose integrated development environment was VB. The software can calculate acceleration, velocity, displacement during piston running, pressure, temperature of the front and back air chamber at any time and the operating performance parameters of the impactor. The law of many factors influencing on the impactor performance can be found and the optimization of the impactor structure parameter can be achieved by the ergodic method by the software. Not only the no-dig impactor but also fully broken pneumatic DTH and breakthrough-type DTH are designed by the software.
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