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  • MODELING AND CARRYING CAPACITY ANALYSIS OF CIRCULAR ARC TOOTH PROFILE CIRCULAR ARC TOOTH LINE CYLINDRICAL GEAR
  • RESEARCH ABOUT FAULT DIAGNOSIS OF BEARING BASED ON INSTRINSIC TIME SCALE DECOMPOSITION AND CONVOLUTIONAL NEURAL NETWORK

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Journal of Mechanical Strength

Journal of Mechanical Strength Journal of Mechanical Strength
  • ISSN: 1001-9669
  • CN: 41-1134/TH
  • Governed by: China Machinery Industry Federation
  • Sponsored by: China Academy of Machinery Zhengzhou Research Institute of Mechanical Engineering Co., Ltd. ；Chinese Mechanical Engineering Society
  • Frequency：Monthly
  • Tel：0371-67710821
  • Address: No.149, Kexue, Avenue, Zhengzhou,Henan, China
  • E-mail：jxqd1975@foxmail.com
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Volume 48 期 9，2026 2026年第48卷第9期

  • ·Vibration·Noise·Monitoring·Diagnosis·

    LI Yaqi, SUI Jingping, CAO Peng, ZHU Rupeng, JIN Guanghu

    DOI：10.16579/j.issn.1001.9669.2026.09.001
    摘要：ObjectiveTo investigate the nonlinear rub-impact dynamic behavior of a power turbine rotor system featuring a large length-to-diameter ratio cantilever turbine disk, and to reveal the influence laws of rotational speed, friction coefficient, and rotor-stator clearance on the vibration characteristics of the system, a bending-torsion coupled dynamic model was constructed based on the finite element method by integrating an eccentric mass coupling element and a rub-impact force model.MethodsThe accuracy of the model was validated through critical speed simulations utilizing Ansys software. Based on numerical solutions obtained by the Newmark-β method, combined with frequency spectrum analysis, Poincaré mapping, and bifurcation diagrams, the regulatory mechanisms of rotational speed (6 000-9 000 r/min), friction coefficient (0.15-0.50), and rotor-stator clearance (0.01-0.30 mm) on the system response were analyzed.ResultsThe rub-impact slightly increases the critical speed of the system (by approximately 2.5%), slightly decreases the bending amplitude, and significantly amplifies the torsional vibration, which exhibits pronounced nonlinear characteristics. Furthermore, an increase in the friction coefficient induces energy transfer from the bending direction to the torsional mode. As the rotor-stator clearance increases, the intrusion displacement of the rotor decreases, thereby attenuating the rub-impact effect. The support is provided for preventing rub-impact faults in aero-engine power turbine rotor systems.  
    关键词：Power turbine rotor;Finite element modeling;Rub-impact;Bending-torsion coupling;Nonlinear motion   
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    CHEN Sirui, LEI Gang, YUAN Haijun, GONG Yuanhua, FU Zude, TAN Peiyao

    DOI：10.16579/j.issn.1001.9669.2026.09.002
    摘要：ObjectiveTo study the dynamics and internal excitation load characteristics of the high-pressure fuel pump during operation, the multi-flexible body dynamic analysis of a high-pressure fuel pump based on modal tests was investigated.MethodsFirstly, taking a certain type of diesel engine high-pressure fuel pump as the research object, a whole-machine dynamic model was established. Secondly, through modal tests, the modal parameters of key components were obtained to verify the finite element model. The modal neutral files obtained from the finite element calculation were utilized to replace the target rigid body components. Finally, by establishing a multi-flexible rigid coupling dynamic model, the differences between the rigid body model and the flexible body model were calculated and compared. Based on this, the internal excitation load characteristics of the high-pressure fuel pump were analyzed.ResultsThe maximum relative error between the finite element results and the modal test results is less than 5%, and the simulated modal vibration modes are consistent with the test modal vibration modes. Compared with the rigid body model, the cam-roller contact force in the rigid-flexible coupling model remains essentially identical. However, considering the influence of component elastic deformation, the maximum load at the bearing increases by 50.8%, and the peak vibration velocity at the bearing shows a significant increase. Particularly, the vibration velocity at the free-end bearing is greater, increasing by a maximum of 77.7% compared to the rigid body model.  
    关键词：Modal test;Finite element analysis;High-pressure fuel pump;Rigid-flexible coupling;Dynamic response   
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    SUN Hanqi, LÜ Shufeng, HU Richa, HU Yuda

    DOI：10.16579/j.issn.1001.9669.2026.09.003
    摘要：ObjectiveThe axisymmetric forced vibration of a ferromagnetic circular plate under mechanical load in a transverse alternating magnetic field was studied.MethodsFirstly, the dynamic model for a ferromagnetic circular plate in a transverse magnetic field was established. Then, based on the small deflection bending theory of the thin plate, the geometric and physical equations of the circular plate were presented, and the virtual work of electromagnetic force and mechanical loads was derived. Finally, the magnetoelastic coupled vibration differential equation of a ferromagnetic circular plate in a transverse magnetic field was derived by using Hamilton's principle. The Galerkin method was applied to discretize the governing equation, yielding an ordinary differential equation for the forced vibration of the plate. Numerical and test methods were employed to study the natural characteristics of the ferromagnetic circular plate structure, and the effects of the plate's geometric dimensions on its vibrational response were analyzed.ResultsThe results provide important insights for predicting the dynamic behavior of ferromagnetic circular plates in practical applications.  
    关键词：Magnetoelasticity;Ferromagnetic circular plate;Dynamic test;Amplitude-frequency characteristic;Forced vibration   
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    MA Jiaqian, GUO Qintao, LU Junhua, HUANG Chao, ZHANG Yue, TAO Yanhe, QIAN Yuechao

    DOI：10.16579/j.issn.1001.9669.2026.09.004
    摘要：ObjectiveTraditional electromagnetic vibration absorbers are constrained by the air gap between iron cores; when the vibration amplitude exceeds the air gap magnitude, the damping effect deteriorates markedly, making it difficult to effectively suppress low-frequency and large-amplitude vibrations of the underhung car body floor of high-mass trains. To address this issue, a cantilever-type electromagnetic vibration absorber was proposed, which amplified the displacement at the electromagnetic force application point through the cantilever structure, thereby achieving active control of low-frequency and large-amplitude vibrations.MethodsFirstly, the segmented variable cross-section beam structure of the cantilever-type electromagnetic vibration absorber was simplified by the integral method and the Rayleigh method. The dynamic differential equations of the system were established and solved to obtain the displacement frequency response function of the primary system, providing a basis for subsequent simulation and test validation. Secondly, a rigid-flexible coupling model of the mechanical system and a mathematical model of the electromagnetic force were established. A fuzzy proportional-integral-derivative (PID) controller was designed using Matlab software, and the active vibration reduction effect was evaluated through co-simulation between Adams and Matlab software. Finally, a principle prototype test bench of the cantilever-type electromagnetic vibration absorber was constructed. A feedback control system was built based on the dSPACE platform, and harmonic excitation vibration reduction tests were conducted to verify the actual vibration reduction performance of the absorber.ResultsThe results show that within the low-frequency excitation range of 8-12 Hz, the theoretical analysis, co-simulation, and test results all verify the effectiveness of the cantilever-type electromagnetic vibration absorber. At the excitation frequency of 8 Hz, the theoretical vibration reduction ratio is 98.79%, the co-simulation ratio is 95.52%, and the test ratio is 56.34%. At 10 Hz excitation, the theoretical, simulation, and test ratios are 80.39%, 79.17%, and 22.68%, respectively. At 12 Hz excitation, the corresponding ratios are 69.65%, 66.65%, and 45.38%. The cantilever-type electromagnetic vibration absorber demonstrates good feasibility and application potential for active control of low-frequency and large-amplitude vibrations.  
    关键词：Active vibration control;Low frequency large vibration;Cantilever type electromagnetic vibration absorber;Co-simulation;Fuzzy PID   
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