Mechanism and Dynamic Behavior of a Novel Hydraulic Force Pulse Generator

Abstract:

Based on the concept of hydraulic damper energy dissipation, a passive Hydraulic Force Pulse Generator (HFPG) is presented. The design comprises a conical poppet valve inside a cylindrical hole without any seat. By virtue of aperture and orifice throttling, HFPG dissipates the kinetic energy of a rapidly moving object and cushions it to a halt to produce desired acceleration pulse. Prompt and easy adjustment can be achieved to the damping force by changing the size of the orifice set on cylinder. A mathematical model of the cushion process is developed by way of analyzing the internal fluid dynamic phenomenon of HFPG. And numerical simulation results of the model has exhibited the following features of HFPG: high-efficiency of energy dissipation; easy-regulation of acceleration waveform and being suitable in conditions with large momentum change, especially to be used as the negative pulse generator of dual-wave shock testing machines which can simulate the shock environment of underwater explosion.

• Periodical: Applied Mechanics and Materials (Volumes 166-169)
• Pages: 1187-1195
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.166-169.1187
• Online since: May 2012
• Authors: Zhi Li Yong, Gong Xian Wang, Jian Ming Yuan
• Keywords: Actuator, Force Pulse Generator, Hydraulic Buffer, Shock Machine, Shock Testing, Underwater Explosion

References

[1] Nathan A Schneider. Prediction of surface ship response to sever underwater explosions using a virtual underwater shock environment. Naval postgraduate school, Monterey, California, (1996)

[2] William T. Forehand. UNDEX testing: when, why & how it began. Proceedings of the 70th Shock and Vibration Symposium, 1999, 251-261

[3] Military Specification, MIL-S-901D, Shock Tests, H.I. High Impact) Shipboard Machinery, Equipment and Systems, Requirement for. DODSIF Issue, Mar. 17,(1989)

DOI: 10.21236/ada550253

[4] Military Specification, BV043-85 .Germany Defense Naval Ship Construction Specification for Shock and Safety,(1985)

[5] Steven Elder, Kevin Arden. Land Based Full Scale Shock Simulator. Proceedings of the 70th shock and vibration symposium-CD,(1999)

[6] Thomas M.Hessburg, Donald G.Krantz. Feed forward control(Based on model Inversion) and system performance prediction using high-fidelity nonlinear dynamic hydraulic system modeling. Proceedings of IEEE International Conference on Control Applications.1997,P57-62

DOI: 10.1109/cca.1997.627468

[7] Ding Fan. Study on cushion process of high speed hydraulic cylinder. Iron and Steel. 1998,Vol 33 No.8,54-57

[8] Li Qiang, Yang Zhen. A study on hydraulic rod controlled automobile simulation absorber. Mechanics and Engineering .2003, Vol 25 No.10,22-24

[9] Herbert E. Merritt. Hydraulic control systems. John Wiley& Sons, Inc.(1967)