深井伽玛定位仪隔振腔抗冲击设计及实验分析

抗振伽玛定位仪器工作在井下2000～4500m,工作时需承受聚能射孔弹最高达3000g/ms的爆破冲击,有效的抗冲击设计是实现该仪器在恶劣条件下工作的关键.为此设计了具有4层隔振环节的隔振腔系统.首先将隔振腔系统简化为4自由度集中质量-弹簧-阻尼系统,并对隔振腔进行了多组冲击载荷实验,结果表明隔振腔系统具有良好的冲击隔振性能.同时采用网格搜索方法确定了实际隔振腔系统的动态等效刚度和动态等效阻尼参数,得到了与试验数据相吻合的系统动力学修正模型参数.

Anti-impact design and experiment of the shock-absorbing cavity of the gamma locator in deep oil well

The gamma locator works in a downwell depth of 2.0～4.5 km and bears the shock effect of 3 000 g/ms from cumulative shell perforation.So anti-shock performance is the key to the design of the gamma locator.For this reason,a shock-absorbing cavity system with four flexible vibration-isolating layers is designed for the apparatus.First,the shock-absorbing cavity system is simplified into a lumped mass-spring--damper system with four freedom degrees.And then,the shock tests of the shock-absorbing cavity system are carried out on an electromotive shaker.The results show that the shock-absorbing cavity system has good shock-absorbing performance.The equivalent dynamic stiffness and the dynamic damping parameters of the actual shock-absorbing cavity system are determined using grid-searching algorithm,and the modified dynamic parameters of the simulation model of the shock-absorbing cavity are obtained which are matched with the input--output data of the shock test.