Study on Dynamic Characteristics of Unsteady Pneumatic Weight Drop Seismic Source

Abstract

Abstract: Based on the theory of gas dynamics and the discretization of continuous attributes, a dynamic numerical model was established. As a result, the critical impact velocity and the shot energy were got. Then, the paper separately studied the relationships among diameter of trachea, impact stroke and shot energy. It shows that the shot energy increases first and then decreases with the increase of the diameter of trachea, and increases linearly with the increase of the stroke. The method provides a reference for shot energy calculation, diameter of trachea and stroke determination.

Key words: weight drop seismic source, pneumatical system, unsteady, high pressure gas, shot energy

摘要： 基于气体动力学理论，采用连续过程离散化方法，建立了气动系统动态数值模型，得到了冲击时刻冲击锤的速度，提出了基于动态过程研究的冲击能量计算方法。分别研究了气管管径、冲击锤行程与冲击能量的关系。研究结果表明，冲击能量随管径的增大先增大后减小，随冲击锤行程的增大线性增大。该方法可为计算重锤震源冲击能量、优选气管管径、确定冲击锤行程提供参考。

关键词: 重锤震源, 气动系统, 非定常, 高压气体, 冲击能量

CLC Number:

TH138
P631.1

Jiang Faguang, Liu Xiaoning, Li Jinfu, Liang Zheng, . Study on Dynamic Characteristics of Unsteady Pneumatic Weight Drop Seismic Source[J]. China Mechanical Engineering.

蒋发光, 刘晓宁, 李进付, 梁政, . 非定常气动重锤震源系统的动态特性研究[J]. 中国机械工程.

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