An approach to analyze the impact response of the free standing equipment to vibration excitations is presented on the basis of the impact vibration model of rigid block.

基于刚体冲击振动模型，建立了浮放设备在振动激励条件下冲击响应分析的理论方法。

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In this paer, by the use of the method of characteristic line of stress wave, a prediction analysis for the sacond impact of an elastic bar impacting on a rigid block is given.

本文采用应力波特征线方法详细分析了刚体撞块撞击固支的弹性长杆的撞击过程。

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In addition, the jointed element has certain thickness, so the calculative parameter can be determined by those of the actual joint. It embodies the improvement to rigid block discrete element method.

另外，节理单元有实际的厚度，可以根据实际节理的性质确定计算参数，这一点也体现出了对刚性块体离散元方法的改进。

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Mr Brown is fond of trumpeting the virtues of Britain's flexible labour markets to his more rigid European colleagues, and it was his government that helped to block the passage of the Agency Workers' Directive last year.

ECONOMIST: A row pits Labour against labour unions