Research on Vibration Reduction Performance of APU Mounting System Based on Modal Analysis and Isolator Optimization

ZHAO Xiaohui; FENG Zhenzhou; WAN Liang

doi:10.7643/issn.1672-9242.2026.09.016

PDF(695 KB)

Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (9) : 140-146. DOI: 10.7643/issn.1672-9242.2026.09.016

Special Topic—Structural Dynamics of Aviation Equipment

Research on Vibration Reduction Performance of APU Mounting System Based on Modal Analysis and Isolator Optimization

ZHAO Xiaohui¹, FENG Zhenzhou^1,2, WAN Liang¹

Author information +

History +

Abstract

The work aims to investigate the vibration reduction efficiency of a specific type of APU mounting system, and carry out a systematic study on dynamic characteristics analysis and vibration isolation performance optimization by integrating dynamic response simulation with experimental testing. Based on a finite element simulation model, combined with modal testing and sine sweep testing, the validity of the simulation model was verified, and the first six modal characteristics of the mounting structure were identified. The acceleration transmissibility under different connection states was compared through dynamic response analysis. To address the issue of uneven uneven dynamic loads on the tie rods, a multi-objective optimization algorithm was employed to optimize the parameters of the vibration isolators. The dynamic response analysis indicated that, within the core operating frequency band of the APU, differences existed in the system's acceleration transmissibility under rigid connection and two types of vibration isolators. Through the optimization algorithm, the optimal combination of vibration isolator stiffness parameters was finally determined, effectively improving the load distribution. This paper reveals the intrinsic correlation between the stiffness of vibration isolators and the dynamic response of the mounting system, offering an important reference for improving the vibration reduction performance of APU mounting systems under complex load environments and for their engineering application.

Key words

APU mounting system / vibration isolation performance / dynamic response simulation / modal test / multi-objective optimization / stiffness parameters / acceleration transmissibility

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

ZHAO Xiaohui, FENG Zhenzhou, WAN Liang. Research on Vibration Reduction Performance of APU Mounting System Based on Modal Analysis and Isolator Optimization[J]. Equipment Environmental Engineering. 2026, 23(9): 140-146 https://doi.org/10.7643/issn.1672-9242.2026.09.016

References

[1] 唐振寰, 罗贵火, 陈伟, 等. 含橡胶隔振器振动系统动态特性研究[J]. 南京航空航天大学学报, 2014, 46(2):285-291.
TANG Z H, LUO G H, CHEN W, et al.Dynamic Characteristics of Vibration System Including Rubber Isolator[J]. Journal of Nanjing University of Aeronautics & Astronautics, 2014, 46(2):285-291.
[2] TANG Z H, LUO G H, CHEN W, et al.Dynamic Characteristic Research of Vibration System with Rubber Isolator[J]. Journal of Nanjing University of Aeronautics and Astronautics, 2014, 46(2):245-251.
[3] 李玲. APU安装系统隔振器特性分析与优化研究[D]. 天津:中国民航大学, 2023.
LI L.Characteristic analysis and optimization of APU mounting system isolator[D]. Tianjin:Civil Aviation University of China, 2023.
[4] 朱茂桃, 唐伟, 王道勇, 等. 半主动液压减振器动态特性建模与试验研究[J]. 振动与冲击, 2018, 37(7):139-145.
ZHU M T, TANG W, WANG D Y, et al.Modeling and Tests for Dynamic Characteristics of a Semi-Active Hydraulic Shock Absorber[J]. Journal of Vibration and Shock, 2018, 37(7):139-145.
[5] 王东镇, 葛剑敏. 基于减振器设计的高速列车地板降噪特性研究[J]. 振动测试与诊断, 2020, 40(1):193-198.
WANG D Z, GE J M.Optimization on Noise Reduction Characteristics of High-Speed Train Floor Based on Floor Absorber Design[J]. Journal of Vibration, Measurement & Diagnosis, 2020, 40(1):193-198.
[6] 蔡建丽, 杨荣, 刘玄, 等. APU减振器刚度对接口载荷影响分析[J]. 机械研究与应用, 2025, 38(1):45-49.
CAI J L, YANG R, LIU X, et al.Analysis of the Influence of APU Vibration Isolator Stiffness on Interface Loads[J]. Mechanical Research & Application, 2025, 38(1):45-49.
[7] 李世尧, 张卫国, 侯军占, 等. 减振器动刚度特性研究[J]. 兵工学报, 2017, 38(11):2274-2279.
LI S Y, ZHANG W G, HOU J Z, et al.Research on Dynamic Stiffness of Vibration Isolator[J]. Acta Armamentarii, 2017, 38(11):2274-2279.
[8] WANG J Q, REN G X, ZHANG R N, et al.Analysis and Verification of Vibration Isolation Performance of Engine Mount Based on Low-Frequency Approximation Method[J]. Journal of Low Frequency Noise, Vibration and Active Control, 2024, 43(3):1223-1243.
[9] DEB K, PRATAP A, AGARWAL S, et al.A Fast and Elitist Multiobjective Genetic Algorithm:NSGA-II[J]. IEEE Transactions on Evolutionary Computation, 2002, 6(2):182-197.
[10] OUMA M O, DENG H, XUE C J.Research on the Optimization of an Aircraft Engine Mount System for Enhanced Vibration Isolation[J]. Aerospace, 2026, 13(1):48.
[11] ZHENG B B, GUO Y M, XIAO L, et al.Optimization of Idle Vibration Characteristics of Powertrain Mounting System[J]. SAE International Journal of Vehicle Dynamics, Stability, and NVH, 2024, 10(8):1-17.
[12] LI M, CHENG W, XIE R L.A Quasi-Zero-Stiffness Vibration Isolator Using a Cam Mechanism with User-Defined Profile[J]. International Journal of Mechanical Sciences, 2021, 189:105938.
[13] 刘馥清, 韩思宇, 徐峰, 等. 航空发动机安装节减振器结构参数对减振性能的影响研究[J]. 机械制造与自动化, 2023, 52(4):73-77.
LIU F Q, HAN S Y, XU F, et al.Research on the Influence of Structural Parameters of Mounting Dampers on Vibration Damping Performance in Aircraft Engines[J]. Machine Building & Automation, 2023, 52(4):73-77.
[14] 张发富, 唐力, 唐宏刚. 民机APU典型安装构型的传力分析[J]. 科技信息, 2012(28):389-390.
ZHANG F F, TANG L, TANG H G.Force Transfer Analysis of Typical Installation Configuration of Civil Aircraft APU[J]. Science & Technology Information, 2012(28):389-390.
[15] 王永福, 朱可一, 乐美煜, 等. 基于Gap单元APU安装系统分载模型与试验验证[J]. 航空动力学报, 2026, 41(7):175-185.
WANG Y F, ZHU K Y, LE M Y, et al.Load Distribution Model and Experimental Validation for APU Installation System Based on Gap Element[J]. Journal of Aerospace Power, 2026, 41(7):175-185.
[16] MATHURIA P H, LIM T C, SHEPARD W S, et al.Vibration and Shock Considerations in the Design of a Truck-Mounted Fuel Cell APU System[C]//Proceedings of SAE International Truck & Bus Meeting & Exhibition. Detroit:SAE International, 2002.
[17] MATHURIA P H.Finite Element Analysis of APU Mounting (3-2-1) in Aircraft/Helicopter Application Using Lumped Mass Modal Analysis[C]//Proceedings of ASME Turbo Expo 2024:Structural/System Design and Dynamics. Orlando:ASME, 2024.
[18] CHEN C L, YAN Q, CHEN Y H, et al.Parameters Sensitivity Study on Dynamic Characteristics of Turbofan Engine Mounting System[C]//Proceedings of 2023 Asia- Pacific International Symposium on Aerospace Technology (APISAT 2023) Proceedings. Singapore:Springer, 2024.
[19] WANG J Q, NIE Y P, CHEN Y H, et al.Analysis and Experimental Study on Vibration Isolation Performance of Full-Scale Turbofan Engine Mounting[J]. Journal of Physics:Conference Series, 2024, 2762(1):012021.
[20] ZHANG Z X, ZHU W, GUO J L, et al.Modal Analysis of Turbofan Engine Mount Systems[C]//Proceedings of 2021 2nd International Conference on Artificial Intelligence and Information Systems. Chongqing:ACM, 2021.
[21] 周素霞, 孙晨龙, 王成国, 等. 高速列车减振器新型活塞结构研发及仿真试验[J]. 机械工程学报, 2018, 54(12):86-92.
ZHOU S X, SUN C L, WANG C G, et al.Research and Simulation Experiment of New Type Piston Structure for High-Speed Train Damper[J]. Journal of Mechanical Engineering, 2018, 54(12):86-92.
[22] LI C, LEI B L, MA Y H, et al.Research on Damping Vibration Reduction Design Method of Aeroengine Supporting Structure System[C]//Proceedings of ASME Turbo Expo 2020:Turbomachinery Technical Conference and Exposition. London:ASME, 2020.