This book chapter presents comprehensive investigations on the use of magnetorheological (MR) shock absorber to mitigate the effect of impact loading, with emphasis on the recoil system. A physical model of the field gun is established and a long-stroke MR recoil absorber with four-stage parallel electromagnetic coils is designed to apply separate current respectively and generate variable magnetic field distributions in the annular flow channel. The response time and the compensation method are investigated to facilitate the application. Based on the dynamic analysis and firing stability condition during the process of shock, the ideal recoil force-stroke profiles of MR absorber at different limiting firing angles are obtained. The experimental studies are carried out on the impact test rig under different combinations of current loading: conventional unified control mode, separate control mode and timing control mode.

Chapter Contents:

• 5.1 Introduction
• 5.2 Gun-recoil system
• 5.3 Design of multi-coil MR absorber
• 5.4 Time response of MR buffer system under impact loading
• 5.4.1 Impact test platform system
• 5.4.2 Current controller
• 5.4.3 Time delay compensation
• 5.4.3.1 Response analysis of electromagnetic drive circuit
• 5.4.3.2 Response analysis of MR impact system
• 5.4.3.3 Time delay compensation methods
• 5.4.3.4 DSP PID controller
• 5.5 Dynamic characteristics of MR buffer system
• 5.5.1 Conventional unified control mode
• 5.5.2 Separate control mode
• 5.5.3 Timing control mode
• 5.6 MR shock buffer device control strategy and experimental verification
• 5.6.1 Methods of MR damper control
• 5.6.2 MR shock buffer control system
• 5.6.3 Fuzzy logic control strategy
• 5.6.3.1 One-dimensional fuzzy control strategy
• 5.6.3.2 Two-dimensional delay fuzzy control strategy
• 5.6.4 Fuzzy control experiment
• 5.6.5 Experimental results and analysis of fuzzy control
• 5.7 Summary
• Acknowledgments
• References

Inspec keywords: impact testing; weapons; shock absorbers; magnetorheology; impact (mechanical)

Other keywords: long-stroke MR recoil absorber; physical model; impact loading mitigation; magnetorheological shock absorber; field gun; annular flow channel; comprehensive investigations; firing stability condition; MR absorber; current loading; separate control mode; impact test rig; response time; book chapter; individually controllable coils; recoil system; variable magnetic field distributions; conventional unified control mode; four-stage parallel electromagnetic coils; ideal recoil force-stroke profiles; compensation method; timing control mode; different limiting firing angles; dynamic analysis

Subjects: Vibrations and shock waves (mechanical engineering); Control technology and theory (production); Numerical analysis; Mechanical components