Abstract:The helicopter seat is mainly in the vibration isolation condition, the stroke of damper is small, and the small damping force is continuously output. When helicopter crashes in an emergency, the damper needs to maintain a balance of force within the buffer stroke and provide large damping and large stroke. Considering the contradiction of damper design requirements under dual-mode working conditions of vibration isolation and anti-crash, a dual-mode magnetorheological damper (MRD) with variable damping gap is proposed, which can meet the requirements of helicopter seat vibration isolation and anti-crash at the same time. To verify the effectiveness of the proposed structure, the mechanical model of damper is established, and the topology is optimized. Based on the optimization results, the prototype of MRD is manufactured and tested. The results show that Coulomb force of MRD under selected shock conditions is stable and controllable, and its vibration isolation unit has a good dynamic range. Both the maximum damping force and the dynamic range meet the design requirements.
董小闵,邓雄,王陶,李鑫,晏茂森. 双模式变间隙磁流变阻尼器研究[J]. 振动与冲击, 2023, 42(3): 129-138.
DONG Xiaomin, DENG Xiong, WANG Tao, LI Xin, YAN Maosen. Dual-mode variable clearance MR damper. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(3): 129-138.
[1] 何才富. 直升机抗坠毀座椅舒适性分析[J]. 直升机技术, 2003(02): 31-34.
HE Caifu. The comfortable analysis of the helicopter crashworthy seat[J]. Helicopter Technique, 2003(02): 31-34.
[2] Astori P, Zanella M, Bernardini M. Validation of Numerical Models of a Rotorcraft Crashworthy Seat and Subfloor[J]. Aerospace, 2020, 7(12).
[3] Galehdari S A, Khodarahmi H. Design and analysis of a graded honeycomb shock absorber for a helicopter seat during a crash condition[J]. International Journal Of Crashworthiness, 2016, 21(3): 231-241.
[4] Chen Y, Wickramasinghe V, Zimcik D. Development and evaluation of hybrid seat cushions for helicopter aircrew vibration mitigation[J]. Journal Of Intelligent Material Systems And Structures, 2015, 26(13): 1633-1645.
[5] Jiang R, Rui X, Yang F, et al. Simulation and experiment of the magnetorheological seat suspension with a seated occupant in both shock and vibration occasions[J]. Smart Materials and Structures, 2020, 29(10).
[6] Tharehalli Mata G, Mokenapalli V, Krishna H. Performance analysis of MR damper based semi-active suspension system using optimally tuned controllers[J]. Proceedings of the Institution of Mechanical Engineers Part D-Journal Of Automobile Engineering, 2021, 235(10-11): 2871-2884.
[7] Jiang R L, Rui X T, Yang F F, et al. Simulation and experiment of the magnetorheological seat suspension with a seated occupant in both shock and vibration occasions[J]. Smart Materials And Structures, 2020, 29(10).
[8] 董小闵, 丁飞耀, 管治, 等. 面向高速的磁流变缓冲器多目标优化设计及性能研究[J]. 机械工程学报, 2014, 50(05): 127-134.
DONG Xiaomin, DING Feiyao, GUAN Zhi, et al. Multi-objective optimization and performance research of magneto-rheological absorber under high speed[J]. Journal of Mechanical Engineering, 2014, 50(05): 127-134.
[9] Woo D, Choi S-B, Choi Y T, et al. Frontal crash mitigation using MR impact damper for controllable bumper[J]. Journal Of Intelligent Material Systems And Structures, 2007, 18(12): 1211-1215.
[10] Archakam P K, Muthuswamy S. Design and Simulation of a Crash Energy Absorption System Integrated with Magneto-Rheological Absorber[J]. Journal Of Vibration Engineering & Technologies, 2021.
[11] Han C, Kim B-G, Kang B-H, et al. Effects of magnetic core parameters on landing stability and efficiency of magnetorheological damper-based landing gear system[J]. Journal Of Intelligent Material Systems And Structures, 2020, 31(2): 198-208.
[12] Yoon J-Y, Kang B-H, Kim J-H, et al. New control logic based on mechanical energy conservation for aircraft landing gear system with magnetorheological dampers[J]. Smart Materials And Structures, 2020, 29(8).
[13] Han C, Kang B H, Choi S B, et al. Control of Landing Efficiency of an Aircraft Landing Gear System With Magnetorheological Dampers[J]. Journal Of Aircraft, 2019, 56(5): 1980-1986.
[14] Singh H J, Wereley N M, Asme. Optimized biodynamic shock attenuation performance using an adaptive seat suspension[C]. 4th Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures and Intelligent Systems (SMASIS), 2011: 387-395.
[15] Singh H J, Hu W, Wereley N M, et al. Experimental validation of a magnetorheological energy absorber design optimized for shock and impact loads[J]. Smart Materials And Structures, 2014, 23(12).
[16] Hiemenz G J, Choi Y T, Wereley N M. Semi-active control of vertical stroking helicopter crew seat for enhanced crashworthiness[J]. Journal Of Aircraft, 2007, 44(3): 1031-1034.
[17] Wereley N M, Choi Y T, Singh H J. Adaptive energy absorbers for drop-induced shock mitigation[J]. Journal of Intelligent Material Systems and Structures, 2011, 22(6): 515-519.
[18] Wang M K, Chen Z B, Wereley N M. Adaptive magnetorheological energy absorber control method for drop-induced shock mitigation[J]. Journal Of Intelligent Material Systems And Structures, 2021, 32(4): 449-461.
[19] Murugan M, Yoo J, Hiemenz G, et al. Analytical evaluation of adaptive seat energy absorber for rotorcraft semi-active crash safety seat development[C]. ASME Conference on Smart Materials, Adaptive Structures and Intelligent Systems, 2013.
[20] Singh H J, Wereley N M. Influence of occupant compliance on a vertically stroking helicopter crew seat suspension[J]. Journal Of Aircraft, 2015, 52(4): 1286-1297.
[21] Hiemenz G J, Hu W, Wereley N M. Semi-active magnetorheological helicopter crew seat suspension for vibration isolation[J]. Journal of Aircraft, 2008, 45(3): 945-953.
[22] 王迪. 面向直升机座椅系统的磁流变阻尼器半主动隔振问题研究[D]. 哈尔滨工业大学, 2014.
WANG Di. Research on magnetorheological damper semi-active vibration isolation oriented to helicopter seating system[D]. Harbin Institute of Technology, 2014.
[23] Mao M, Hu W, Choi Y T, et al. Experimental validation of a magnetorheological energy absorber design analysis[J]. Journal Of Intelligent Material Systems And Structures, 2014, 25(3): 352-363.
[24] Spurk J H, Aksel N. Fluid Mechanics. 2nd Edition[M]. Berlin: Springer-Verlag, 2008.
[25] Franzini J B, Daugherty R L, Finnemore E J. Fluid mechanics with engineering applications[M]. New York: McGraw-Hill, 1997.
[26] Powell L a A, Choi Y T, Hu W, et al. Nonlinear modeling of adaptive magnetorheological landing gear dampers under impact conditions[J]. Smart Materials And Structures, 2016, 25(11).
[27] 贾永枢, 周孔亢. 车用磁流变液流变特性分析及试验[J]. 机械工程学报, 2009, 45(06): 246-250.
JIA Yongshu, ZHOU Kongkang. Rheological properties analysis and experiment of magnetorheological fluid for automobile[J]. Journal of Mechanical Engineering, 2009, 45(06): 246-250.
[28] Balajewicz M J, Dowell E H, Noack B R. Low-dimensional modelling of high-Reynolds-number shear flows incorporating constraints from the Navier-Stokes equation[J]. Journal of Fluid Mechanics, 2013, 729: 285-308.
[29] 鞠锐, 廖昌荣, 周治江, 等. 单筒充气型轿车磁流变液减振器研究[J]. 振动与冲击, 2014, 33(19): 86-92.
JU Rui, LIAO Changrong,ZHOU Zhijiang, et al. Car MR fluid shock absorber with mono-tube and charged-gas bag[J]. Journal of Vibration and Shock, 2014, 33(19): 86-92.
[30] 董小闵, 王陶, 王羚杰, 等 旋转式磁流变螺旋流动阻尼器扭矩增强研究[J]. 湖南大学学报(自然科学版), 2021, 48(10): 39-47.
DONG Xiaomin, WANG Tao, WANG Lingjie, et al. Research on torque enhancement of rotary magnetorheological damper based on helical flow[J]. Journal of Hunan University (Natural Sciences), 2021, 48(10): 39-47.
[31] 高云凯, 段少东. 基于NSGA-Ⅱ算法的客车底架的离散拓扑优化[J]. 同济大学学报(自然科学版), 2017, 45(11): 1664-1669.
GAO Yunkai, DUAN Shaodong. Discrete topology optimization of bus chassis frame based on NSGA-Ⅱ[J]. Journal of Tongji University (Natural Science), 2017, 45(11): 1664-1669.
[32] Xi J, Dong X, Li W, et al. A novel passive adaptive magnetorheological energy absorber[J]. Smart Material Structures, 2021, 30: 014001.
[33] Hiemenz G J, Choi Y T, Wereley N M. Semi-active control of vertical stroking helicopter crew seat for enhanced crashworthiness[J]. Journal of Aircraft, 2007, 44(3): 1031-1034.