The Design And Research Of The Counterweight For Transverse Impact Testing Machine

The counterweight structure is a type of assist device in the shock test process for 5000 kg submarine equipment which replace the real equipment for impact test.It is an important component in the shipboard equipment shock test system.The strength,stiffness and shock resistance have an impact on data collection in the impact resistance test process.Therefore,the research of the counterweight structure in the transverse impact test is significant improve the test accuracy and reduce the cost of transverse impact testing machine debugging process.According to the requirement of the shipboard equipment shock test,four different counterweight structure plan is proposed and analyzed the optimized designing plan.The article is mainly divided into 5 aspects:(1)The typical ship equipments is simplified into flexural cantilever model with a series of different inherent frequency.And based which,the damage potential of the underwater explosion shock environment to the shipborne equipment is analyzed and the damage potential of the non-contact underwater explosion shock environment to the shipborne equipment is obtained including the expressive method.The FEM calculation represents the pseudo-velocity spectrum has the closet relations with the stress response relationship.(2)The counterweight is the key auxiliary facilities of the transverse impact test system debugging process.The current adjustability of the weight of the counterweight and the transverse shock resistance is unsatisfied.Thus,four different overweight structure plan is proposed according to the requirement of the shipboard equipment horizontal impact test.Each plan has more reasonable structure and more flexible weight of the counterweight with small space occupation,which is suitable on the lateral impact testing machine.(3)Compared with each plan and combining the modal analysis,the fourth plan is set as the optimized plan.The structure is manufactured according to this plan and the final adjustable structure of balancing weight is obtained.(4)The transverse shock response analysis is implemented to the counterweight structure and the transverse shock resistance is analyzed to verify the overall structure of the counterweight,the fastening bolt and the most obvious position and changes of the cutout.The result shows the maximum stress of the overall structure of the counterweight,the fastening bolt and the cutout is less than the permissible stress,which means the shock resistance meet the requirements.(5)The transverse impact test is implemented to the full-sized model of the counterweight structure according to the GJB.The result shows the structure of the overall structure of the counterweight and the fastening bolt and the cutout is not damaged and shape-changed.The acceleration,velocity and displacement simulation data of the typical structure has less than 10% errors compared with the test data,which meet the requirement of the engineering prediction accuracy.Therefore,applying the simulation calculation model to obtain the impact response is reasonable.