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Nonlinear stress analysis of aero-engine pipeline based on semi-analytical method

Applied Mathematics and Mechanics(English Edition) 2025年第3期46卷 521-538页

作者： Weijiao CHEN Xiaochi QU Ruixin ZHANG Xumin GUO Hui MA Bangchun WEN School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China Key Laboratory of Vibration and Control of Aero-Propulsion Systems Ministry of Education of China Northeastern UniversityShenyang 110819China

Fatigue failure caused by vibration is the most common type of pipeline *** core of this research is to obtain the nonlinear dynamic stress of a pipeline system accurately and efficiently,a topic that needs to be explored in the existing *** shell theory can better simulate the circumferential stress distribution,and thus the Mindlin-Reissner shell theory is used to model the *** this paper,the continuous pipeline system is combined with clamps through modal expansion for the first time,which realizes the coupling problem between a shell and a *** the Bouc-Wen model is used to simulate the nonlinear external force generated by a clamp,the nonlinear coupling characteristics of the system are effectively ***,the dynamic equation of the clamp-pipeline system is established according to the Lagrange energy *** on the resonance frequency and stress amplitude obtained from the experiment,the nonlinear parameters of the clamp are identified with the semi-analytical method(SAM)and particle swarm optimization(PSO)*** study provides a theoretical basis for the clamp-pipeline system and an efficient and universal solution for stress prediction and analysis of pipelines in engineering.

关键词： pipeline modeling stress analysis nonlinear-clamp support nonlinear vibration

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Design and Performance Test of an H-shaped Bionic Piezoelectric Robot Based on the Standing Wave Principle

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Journal of Bionic Engineering 2025年第2期22卷 608-625页

作者： Ying Li Chaofeng Li Zhiwei Wu Binbin Zhu Jinghu Tang School of Mechanical Engineering and Automation Northeastern UniversityShenyang110819People’s Republic of China Key Laboratory of Vibration and Control of Aero-propulsion Systems Northeastern UniversityShenyang110819People’s Republic of China State Key Laboratory of Internet of Things for Smart City University of MacaoMacao999078People’s Republic of China

In this paper,inspired by the running motion gait of a cheetah,an H-shaped bionic piezoelectric robot(H-BPR)based on the standing wave principle is proposed and *** piezoelectric robot realizes linear motion,turning motion,and turning motion with different radi by the voltage differential driving method.A prototype with a weight of 38 g and dimensions of 150×80×31 mm^(3) was ***,the dynamics and kinematics of the piezoelectric robot were analyzed to obtain the trajectory of a point at the end of the piezoelectric robot *** motion principle of the piezo-electric robot was analyzed,and then the piezoelectric robot's modal analysis and harmonic response analysis were carried out using finite element analysis ***,an experimental setup was built to verify the effectiveness and high efficiency of the robot's motion,and the effects of frequency,voltage,load,and height of the driving leg on the robot's motion performance were *** performance test results show that the piezoelectric robot has a maximum veloc-ity of 66.79 mm/s at an excitation voltage of 320 V and a load capacity of 55 *** addition,the H-BPR with unequal drive legs has better climbing performance,and the obtained conclusions are informative for selecting leg heights for piezoelectric robots.

关键词： Piezoelectric Standing wave principle Bionic Differential driving method Robot

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Fault Detection Unknown Input Observer for Local Nonlinear Fuzzy Autonomous Ground Vehicles system Based on a Joint Peak-to-Peak Analysis and Zonotopic Analysis Threshold

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IEEE Transactions on Vehicular Technology 2025年第5期74卷 7226-7236页

作者： Li, Yi Dong, Jiuxiang Northeastern University State Key Laboratory of Synthetical Automation of Process Industries Shenyang110819 China Northeastern University College of Information Science and Engineering Shenyang110819 China Northeastern University Key Laboratory of Vibration and Control of Aero-Propulsion Systems Ministry of Education of China Liaoning Shenyang China

This paper focuses on the fault detection problem of local nonlinear fuzzy autonomous ground vehicles systems with disturbances by developing set membership estimation. The intractable influence of disturbances and local nonlinear part on the design of fault detection thresholds is the principal difficulty in fault detection using the existing set membership estimation methods. To this end, a fault detection unknown input observer via a novel joint peak-to-peak analysis and zonotopic analysis threshold is proposed. Firstly, the disturbances are divided into decouplable and non-decouplable parts. An unknown input observer, designed with peak-to-peak performance criteria, is employed to achieve the decoupling of the decouplable disturbance part. Subsequently, based on the dynamic structure of the observer, the local non-linear part is represented as polyhedra through peak-to-peak analysis and zonotopic analysis, thereby providing an interval estimation for the system output. his method utilizes zonotopic analysis to mitigate the over-estimation issue in the initial stage inherent in traditional peak-to-peak performance-based interval estimation techniques. Furthermore, it retains the necessary degrees of freedom during the decoupling process of certain disturbances to optimize the observer's performance. Consequently, this approach significantly enhances the accuracy of the interval estimation as compared to existing methods. Moreover, the peak-to-peak performance of fault detection unknown input observer is analysed using the fuzzy basis-dependent Lyapunov function to decrease the conservatism. Lastly, simulations are analysed in order to validate the accuracy of the proposed thresholds. © 1967-2012 IEEE.

关键词： Lyapunov functions

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Dynamic modeling and simulation of blade-casing system with rubbing considering time-varying stiffness and mass of casing

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Applied Mathematics and Mechanics(English Edition) 2025年第5期46卷 849-868页

作者： Hui MA Hong GUAN Lin QU Xumin GUO Qinqin MU Yao ZENG Yanyan CHEN School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China Key Laboratory of Vibration and Control of Aero-Propulsion Systems Ministry of Education of ChinaNortheastern UniversityShenyang 110819China Sunny Optical Technology(Group)Co.Ltd. Ningbo 315400Zhejiang ProvinceChina Aircraft Strength Institute of China Xi’an 710065China AECC Sichuan Gas Turbine Research Institute Chengdu 610500China

As a common fault of the aero-engine,the blade-casing rubbing(BCR)has the potential to cause catastrophic *** this paper,to investigate the dynamic responses and wear characteristics of the system,the laminated shell element is used to establish the finite element model(FEM)of a flexibly coated casing *** the shell element,the blade is modeled,and the surface stress of the blade is *** stress-solving method of the blade is validated through comparisons with the measured time-domain waveform of the ***,a dynamic model of a blade-flexibly coated casing system with rubbing is proposed,accounting for the time-varying mass and stiffness of the casing caused by coating *** effects of the proposed flexible casing model are compared with those of a rigid casing model,and the stress changes induced by rubbing are *** results show that the natural characteristics of the coated casing decrease due to the coating *** flexibly coated casing model is found to be more suitable for studying casing ***,the stress changes caused by rubbing are slight,and the change in the stress maximum is approximately 5%under the influence of the abrasive coating.

关键词： dynamic modeling flexibly coated casing rubbing coating wear nonlinear vibration

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Analysis of multi-field cavitation structure and dynamic mode decomposition based on a separated venturi cavitation generator

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European Journal of Mechanics, B/Fluids 2025年 113卷

作者： Wang, Xiaoyu Wang, Tian Ma, Junqi Sun, Qiang Lv, WanYu School of Mechanical Engineering and Automation Northeastern University Shenyang110819 China Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education Northeastern University Shenyang110819 China AECC Shenyang Engine Research Institute Shenyang110015 China

Cavitation is generated due to the reduction of fluid pressure, which will cause instability and erosion inside the pipeline, valve or pump etc. In this paper, based on the improved venturi cavitation generator, the cavitation under several different flow conditions is studied, and a high-speed camera is used to capture the dynamic process of cavitation at the venturi throat. The flow field simulation data have been analysed using the dynamic mode decomposition method, and the coherent structures of sheet cavitation, transition zone cavitation, and cloud cavitation and their displacements with cycle time have been investigated. The periodic variation of cavitation is analysed using a combination of experimental and numerical simulations, and the state of cavitation in the flow field is investigated in detail using data-driven tools. The results show that periodic changes in the cavitation structure can be observed intuitively through the improved venturi generator and agrees well with the results of simulation. Cavitation intensity is continuously enhanced with the increase of inlet velocity. At flow velocity of 4.68 m/s, the cavitation is manifested as a piecewise cavitation that can only be observed at the throat position, since then the length of the cavitation cloud continues to increase, finally the detachment of a bubble cloud and localized vortex cavitation are observed at velocity of 6.08 m/s. The frequency and growth characteristics of individual flow modes can be accurately captured using the dynamic modal decomposition of the flow field. © 2025

关键词： High speed cameras

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vibration of Composite High Aspect Ratio Thin-Walled Wing-Aileron Plate Coupling Structures With Hinged Connection: Analytical and Experimental Investigations

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International Journal of Structural Stability and Dynamics 2025年

作者： Song, Xu-Yuan Zhang, He Zhao, Wen-Rui Qin, Zheng-Qi Zhang, Ye-Wei College of Aerospace Engineering Shenyang Aerospace University Shenyang110136 China Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education Northeastern University Shenyang110819 China

This literature contributed to scientific experimental and theoretical investigations to gain insight into the coupling vibration of composite high aspect ratio thin-walled wing-aileron plate structures with a hinged connection of aircraft. In order to facilitate the analysis and design process, a composite plate combining structures with hinged connection (CPSHC), which were connected by a set of hinged structures, was considered as the mechanical model of the composite high-aspect ratio thin-walled wing-aileron plate structures. The kinetic energy, potential energy and hygrothermal potential energy are derived via the Kirchhoff thin plate hypothesis, and a group of elastic springs are introduced to install zones of the plain bearings to simulate dynamic bearing stiffness. The governing equation of motion of the thin-walled wing-aileron plate coupling structures can be derived in the frame of the Rayleigh–Ritz method according to adopting a range of modified orthogonal polynomials as the displacement admissible functions. The piecewise-linear nonlinear stiffness analytical model of the hinged structures is established via the experiment. To validate the correctness and accuracy of the method, a series of experiments and finite element simulations were carried out. Subsequently, the distinctive vibration characteristics of the CPSHC under varying hinge stiffness, different lengths of the hinge structure, diverse installation positions of the hinge structure, and distinct rotation angles were delved into in depth. Additionally, the influence of thermal loads on the vibration of the CPSHC is especially prominent within a particular temperature range, mainly being affected by the inherent characteristics of the material. © 2026 World Scientific Publishing Company.

关键词： Piecewise linear techniques

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考虑装配误差影响的齿轮副啮合特性优化（英文）

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Journal of Central South University 2025年第4期32卷 1400-1430页

作者：赵晓剑马辉马泽宇刘家奇曹鹏吴玉萍丁相符赵天宇 School of Mechanical Engineering and Automation Northeastern University Key Laboratory of Vibration and Control of Aero-Propulsion Systems of Ministry of Education Northeastern University AECC Hunan Aviation Powerplant Research Institute School of Science Northeastern University

齿轮装配误差会导致系统振动和噪声增大，影响系统的稳定性。这种影响可以通过齿轮微观修形得到补偿。首先，提出了一种考虑微观修形和耦合装配误差的改进三维轮齿加载接触分析(3D-LTCA)方法，并利用MASTA软件以及三个案例验证了该方法... 详细信息

齿轮装配误差会导致系统振动和噪声增大，影响系统的稳定性。这种影响可以通过齿轮微观修形得到补偿。首先，提出了一种考虑微观修形和耦合装配误差的改进三维轮齿加载接触分析(3D-LTCA)方法，并利用MASTA软件以及三个案例验证了该方法的准确性；其次，基于BP神经网络建立修形参数与啮合力学参数之间映射的代理模型(SM)，验证其有效性性，并将建立的代理模型与常用的Kriging、支持向量回归(SVR)、多项式回归响应面法(RSM)等代理模型进行了对比，从而进一步说明了本文代理模型的优越性；最后，引入SM建立以啮合刚度波动最小和啮合表面载荷分布更均匀为目标的优化模型。结果表明，即使考虑网络训练时间，通过代理模型优化齿轮副的效率仍远高于LTCA方法。优化后，带耦合装配误差的齿轮副的啮合刚度波动减小了34.10%，啮合面左右区域的平均接触应力差减小了62.84%。

关键词：斜齿轮啮合特性轮齿修形装配误差神经网络多目标优化

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Nonlinear vibration of series-parallel fluid-conveying spatial-pipe systems with constrained-layer damping

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International Journal of Mechanical Sciences 2025年 296卷

作者： Ma, Hongwei Ji, Wenhao Zhang, Hui Zhang, Yu Lv, Shang Sun, Wei School of Mechanical Engineering and Automation Northeastern University Shenyang110819 China Key Laboratory of Vibration and Control of Aero-Propulsion Systems Ministry of Education of China Northeastern University Shenyang110819 China

To suppress the vibration of pipe systems, an integrated vibration reduction method is proposed for the series-parallel fluid-conveying spatial pipe (SPFCSP) system, featuring constrained layer damping (CLD) treatments and single and double clamp configurations. Firstly, a generalized semi-analytical modeling framework is developed by integrating laminated fluid-conveying pipe segments, substructure virtual nodes, rigid coupling connections, and the spatial multi-pipe configuration. This framework simultaneously accounts for the energy dissipation of CLD materials, the fluid effect, and the nonlinear characteristics of clamps. Secondly, an amplitude dependence unified nonlinear mechanical model for single and double clamp assemblies is proposed, effectively capturing stiffness softening and interfacial energy dissipation of clamps. Then, a hybrid numerical method is presented to resolve the nonlinear time-frequency vibration responses of the SPFCSP system under combined material and clamp nonlinear effects. The validity of the developed model is systematically verified via finite element analysis and experimental tests under various conditions. Finally, the effects of mechanical parameters of clamps, combined nonlinear effects of materials and clamps, and fluid parameters on the natural characteristics and nonlinear coupling vibration of the SPFCSP system are investigated. These analyses reveal the nonlinear dynamic behavior in SPFCSP systems and evaluate the vibration suppression performance of CLD materials. This research provides theoretical guidance for the optimal design of novel vibration reduction and avoidance strategies in multipurpose pipe systems. © 2025 Elsevier Ltd

关键词： vibration analysis

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Cooperative Optimal Output Tracking for Discrete-Time Multiagent systems: Stabilizing Policy Iteration Frameworks and Analysis

arXiv

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arXiv 2025年

作者： Li, Dongdong Dong, Jiuxiang College of Information Science and Engineering Northeastern University Shenyang110819 China State Key Laboratory of Synthetical Automation of Process Industries Northeastern University Shenyang110819 China Key Laboratory of Vibration and Control of Aero-Propulsion Systems Ministry of Education Northeastern University Shenyang110819 China

In this paper, two model-free optimal output tracking frameworks based on policy iteration for discrete-time multiagent systems are proposed. First, we establish a framework of stabilizing policy iteration that can start from any initial feedback control policy, relaxing the dependence of traditional policy iteration on the initial stabilizing control policy. Then, another efficient and equivalent Q-learning policy iteration framework is developed, which is shown to require only less system data to get the same results as the stabilizing policy iteration. Both frameworks obtain stabilizing control policy by iterating the stabilizing virtual closed-loop system step-by-step to the actual closed-loop system. Multiple explicit schemes for the iteration step-size/coefficient are designed and their stability during the above iterations is analyzed. By using the generated closed-loop stabilizing control policy and two frameworks, the optimal feedback control gain is obtained. The approximate solution of the regulator equations is found by model-free iteration, which leads to the optimal feedforward gain. Finally, the cooperative optimal output tracking is realized by a distributed feedforward-feedback controller. The proposed algorithms are validated by simulation. Copyright © 2025, The Authors. All rights reserved.

关键词： Feedback control

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Comparative analysis of cylindrical lithium-ion battery responses to continuous and intermittent compression: Insights into safety and failure mechanisms

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Energy 2025年 328卷

作者： Zhou, Nan Chen, Zeyu Zhang, Bo Zhao, Haihe Li, Ziheng Liu, Chengxin Han, Dongxu School of Mechanical Engineering and Automation Northeastern University Shenyang China Guangdong Key Laboratory of Battery Safety Guangzhou Institute of Energy Testing Guangzhou China Key Laboratory of Advanced Manufacture Technology for Automobile Parts Chongqing University of Technology Chongqing China Key Laboratory of Vibration and Control of Aero-Propulsion System Northeastern University Shenyang China School of Mechanical Engineering Xi'an Jiaotong University Xi'an China

Understanding lithium-ion battery failure under mechanical abuse is critical for safety. While continuous compression is studied, the effects of intermittent loading and its interaction with State of Charge (SOC) are less understood. This study experimentally investigates the mechano-electrochemo-thermal failure of 18650 NMC cells under continuous versus intermittent compression across various SOCs (20 %–80 %), monitoring mechanical, electrical, and thermal responses. Results revealed complex, non-linear failure mechanisms. High SOC consistently increased failure susceptibility (earlier failure, lower deformation tolerance). Intermittent compression proved significantly more hazardous than continuous loading, particularly at high SOC, accelerating internal damage and causing earlier, more severe thermal runaway, often initiated by identifiable soft short circuits (multi-stage voltage drops). Crucially, stiffness exhibited complex, mode-dependent behavior: non-monotonic under continuous compression (peaking at SOC 20 %) versus a generally monotonic increase under intermittent compression, highlighting loading pattern influence. The anode was the primary heat source during thermal runaway, and anomalous behavior was noted at SOC 60 %. These findings highlight the limitations of standard continuous crush tests and the need to incorporate intermittent loading in safety assessments. The complex, mode- and SOC-dependent mechanical responses provide critical data for robust battery pack design (considering stiffness variations and fatigue) and inform Battery Management system (BMS) failure precursor detection. © 2025 Elsevier Ltd

关键词： Lithium-ion batteries

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