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Multi-blade rubbing characteristics of the shaft-disk-blade-casing system with large rotation

Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 111-136页

作者： Zhiyuan WU linchuan zhao Han YAN Ge YAN Ao CHEN Wenming ZHANG State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Institute of Aerospace Systems Engineering Shanghai 201108China

Blade rubbing faults cause detrimental impact on the operation of aeroengines. Most of the existing studies on blade rubbing in the shaft-disk-blade-casing(SDBC) system have overlooked the elastic deformation of the blade, while some only consider the whirl of the rotor, neglecting its spin. To address these limitations, this paper proposes a dynamic model with large rotation for the SDBC system. The model incorporates the spin and whirl of the rotor, enabling the realistic reproduction of multiblade rubbing faults. To verify the accuracy of the SDBC model with large rotation and demonstrate its capability to effectively consider the rotational effects such as the centrifugal stiffening and gyroscopic effects, the natural characteristics and dynamic responses of the proposed model are compared with those obtained from reported research and experimental results. Furthermore, the effects of the rotating speed, contact stiffness,and blade number on the dynamic characteristics of the SDBC system with multi-blade rubbing are investigated. The results indicate that the phase angle between the rotor deflection and the unbalance excitation force increases with the increasing rotating speed,which significantly influences the rubbing penetration of each blade. The natural frequency of the SDBC system with rubbing constrain can be observed in the acceleration response of the casing and the torsional response of the shaft, and the frequency is related to the contact stiffness. Moreover, the vibration amplitude increases significantly with the product of the blade number under rubbing, and the rotating frequency approaches the natural frequency of the SDBC system. The proposed model can provide valuable insight for the fault diagnosis of rubbing in bladed rotating machinery.

关键词： shaft-disk-blade-casing(SDBC) large rotation spin and whirl multi-blade rubbing rotational effect

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转轴-轮盘-裂纹叶片耦合系统的叶尖振动特性

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航空学报 2024年第4期45卷 90-104页

作者：吴志渊赵林川颜格胡海峰杨志勃张文明上海交通大学机械系统与振动国家重点实验室上海200240 国防科技大学装备综合保障国防科技重点实验室长沙410075 西安交通大学机械制造系统工程国家重点实验室西安710049

航空发动机叶片在极端恶劣环境中工作,容易产生裂纹进而缩短叶片寿命,严重影响航空发动机的安全运行。以转轴-轮盘-裂纹叶片耦合系统为研究对象,采用有限元、假设模态混合的建模策略,利用有限元模拟转轴,基于Kirch⁃hoff板理论、Timoshe... 详细信息

航空发动机叶片在极端恶劣环境中工作,容易产生裂纹进而缩短叶片寿命,严重影响航空发动机的安全运行。以转轴-轮盘-裂纹叶片耦合系统为研究对象,采用有限元、假设模态混合的建模策略,利用有限元模拟转轴,基于Kirch⁃hoff板理论、Timoshenko梁理论模拟轮盘、旋转叶片,并根据时变的释放应变能确定呼吸裂纹导致的时变损失刚度,建立了相应的动力学模型;通过对比耦合系统的固有特性和振动响应验证了提出方法的正确性;剖析了重力载荷、转子不平衡力、气动载荷对叶尖振动特性的影响,并研究了不同无量纲裂纹深度和裂纹位置对叶尖振动特性的影响。研究结果表明:健康叶片中,重力载荷会导致叶片产生振动,转子不平衡力会导致叶片发生静变形;在旋转状态下,裂纹叶片导致叶尖弯曲位移产生偏移量;在气动载荷作用下,呼吸裂纹导致叶片发生非线性振动;常值分量与转频幅值比、常值分量与气动激励频率幅值比是评价呼吸裂纹的有效指标。本文的建模方法和分析结论可为航空发动机叶片裂纹故障诊断提供了一定的理论依据。

关键词：转轴-轮盘-裂纹叶片呼吸裂纹重力载荷转子不平衡力气动载荷

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Bio-inspired polygonal skeleton structure for vibration isolation:Design,modelling,and experiment

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Science China(Technological Sciences) 2020年第12期63卷 2617-2630页

作者： YAN Ge WANG Sen ZOU HongXiang zhao linchuan GAO QiuHua ZHANG WenMing State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Aerospace Control Technology Institute Shanghai 201109China

Inspired by the safe landing of a cat falling from a high altitude,a bio-inspired polygonal skeleton(BIPS) structure is proposed,and its nonlinear characteristics are systematically studied to explore its potential application in the suppression of vibration. The polygon is formed by the skeleton structure of the cat’s entire body and the ground. The BIPS system consists of two symmetrical bionic legs with three robs(as skeleton) and four horizontal springs(as muscle). Two bionic legs are connected through the bearing platform(as spine),which could adjust the distance between the two bionic legs. A theoretical model is developed to characterize its stiffness nonlinearity through geometrical and mechanical analysis. Parameter analysis reveals that the BIPS structure has diverse stiffness,including nonlinear positive stiffness and negative stiffness. By imitating adjustment of leg posture and telescopic function of the spine(control the distance between legs),these flexible stiffness properties can be adjusted by structure parameters. In addition,the load capacity and working range can also be designed by the length of the bars,the initial angle,the mounting position,and the spring stiffness. The experimental setup is established,and the vibration isolation performance under various excitation is tested. The experimental results verify the accuracy of the dynamic model and also show that the proposed BIPS structure can suppress the vibration effectively under a variety of excitations. These peculiarities may provide potential possibility of an innovative approach to passive vibration control and isolation.

关键词： bio-inspired polygonal skeleton structure nonlinear stiffness passive vibration isolator

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Nonlinear characterization and performance optimization for broadband bistable energy harvester

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Acta Mechanica Sinica 2020年第3期36卷 578-591页

作者： Ting Tan Zhimiao Yan Kejing Ma Fengrui Liu linchuan zhao Wenming Zhang State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Ocean Engineering School of Naval ArchitectureOcean&Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

As two crucial indicators of bistable energy harvesting performance,band width and power amplitude are simultaneously investigated for obtaining the synergy *** this goal,a nonlinear electromechanical-coupled distributed-parameter model of the bistable piezoelectric energy harvester is *** on the electromechanical decoupled method,approximate higher-order analytical solutions of the beam displacement,harvested power and effective bandwidth are *** cubic-function discriminant of the analytical solution is introduced to determine the nonlinear excitation-frequency boundaries of multiple solutions and power *** stability of the multiple solutions is analyzed through Jacobi matrix of the modulation *** resonance is *** and downward sweep experiments and numerical solutions of time history curves,phase portraits and power spectra confirm the analytical *** realize optimized broadband energy harvesting,the parametric study on the coefficients of the linear and cubic elastic external forces with the corresponding optimal load resistance is *** the nonlinear hardening case,more positive linear coefficient is *** the nonlinear softening case,the cubic coefficient slightly larger than its optimal value is recommended at each given linear *** tuning the load resistance and linear and cubic coefficients of the external force,broadband bistable energy harvesting with optimized power is realized.

关键词： Vibration energy harvesting Bistable solution Broadband Superharmonic resonance

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Enhanced triboelectric output of PDMS-based composite film with bi-material filling and surface patterning

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Science China(Technological Sciences) 2023年第10期66卷 2930-2941页

作者： LIU Sheng LIAO SiHua LIU Dan zhao Rong ZHOU Teng YAN WenYuan WEI KeXiang ZOU HongXiang zhao linchuan Hunan Provincial Key Laboratory of Vehicle Power and Transmission System Hunan Institute of EngineeringXiangtan 411104China State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Triboelectric nanogenerators(TENGs)are highly promising energy-harvesting devices that exhibit considerable potential for use in self-powered wearable ***/microfillers and surface microstructure modification have been proposed to improve the triboelectric performance of *** this work,performance-enhanced flexible polydimethylsiloxane(PDMS)was developed through bi-material(reduced graphene oxide/fluorinated ethylene propylene,rGO/FEP)modification and filtrationmembrane-patterned surface *** rGO/FEP with high charge-inducing and-trapping capabilities can be used as the dielectric-enhanced filler for improving *** micro-dents of 5–50μm are created on the modified PDMS surface with an increased contact area of *** with the pure PDMS,the modified PDMS film-based TENG could deliver a substantial enhancement in power density(0.87 mW cm^(-2))by 28 ***,the versatility of this device is demonstrated in human activity monitoring and capacitor *** work provided a simple,high-tunability,and scalable approach for improving the output performance of TENGs for biomechanical energy-harvesting devices that can be integrated into self-powering wearable electronics.

关键词： triboelectric nanogenerator energy harvesting wearable sensor dielectric enhancement surface modification

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Enhanced galloping energy harvester with cooperative mode of vibration and collision

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Applied Mathematics and Mechanics(English Edition) 2022年第7期43卷 945-958页

作者： Qiong WANG Zewen CHEN linchuan zhao Meng LI Hongxiang ZOU Kexiang WEI Xizheng ZHANG Wenming ZHANG Hunan Provincial Key Laboratory of Vehicle Power and Transmission System Hunan Institute of EngineeringXiangtan 411104Hunan ProvinceChina State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

The low power and narrow speed range remain bottlenecks that constrain the application of small-scale wind energy *** paper proposes a simple,lowcost,and reliable method to address these critical issues.A galloping energy harvester with the cooperative mode of vibration and collision(GEH-VC)is presented.A pair of curved boundaries attached with functional materials are introduced,which not only improve the performance of the vibration energy harvesting system,but also convert more mechanical energy into electrical energy during *** beam deforms and the piezoelectric energy harvester(PEH)generates electricity during the flow-induced *** addition,the beam contacts and separates from the boundaries,and the triboelectric nanogenerator(TENG)generates electricity during the *** order to reduce the influence of the boundaries on the aerodynamic performance and the feasibility of increasing the working area of the TENG,a vertical structure is *** the wind speed is high,the curved boundaries maintain a stable amplitude of the vibration system and increase the frequency of the vibration system,thereby avoiding damage to the piezoelectric sheet and improving the electromechanical conversion efficiency,and the TENG works with the PEH to generate *** the boundaries can protect the PEH at high wind speeds,its stiffness can be designed to be low to start working at low wind *** electromechanical coupling dynamic model is established according to the GEH-VC operating principle and is verified *** results show that the GEH-VC has a wide range of operating wind speeds,and the average power can be increased by 180%compared with the traditional galloping *** GEH-VC prototype is demonstrated to power a commercial temperature *** study provides a novel perspective on the design of hybrid electromechanical conversion mechanisms,that is,to combine and collaborate based on their respective char

关键词： energy harvesting wind energy galloping piezoelectric energy harvester(PEH)

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Design,modeling and experimental investigation of a magnetically modulated rotational energy harvester for low frequency and irregular vibration

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Science China(Technological Sciences) 2020年第10期63卷 2051-2062页

作者： zhao linchuan ZOU HongXiang GAO QiuHua YAN Ge WU ZhiYuan LIU FengRui WEI KeXiang YANG Bin ZHANG WenMing State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Hunan Provincial Key Laboratory of Vehicle Power and Transmission System Hunan Institute of EngineeringXiangtan 411104China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Shanghai Jiao Tong UniversityShanghai 200240China

Vibration energy harvesting is a promising approach for sustainable energy generation from ambience to meet the development of self-powered ***,we propose a novel compact non-resonant magnetically modulated rotational energy harvester(MMR-EH)for low frequency and irregular *** the rational arrangement of multiple magnetic fields in space,a ring route with low potential energy is established.A movable magnet can be non-contact modulated by the magnetic force to move along the ring route under irregular vibration,which is instrumental in electromechanical energy conversion.A dynamic model of the MMR-EH is developed based on the energy method and verified *** effects of key parameters on the magnetically modulated route are *** simulation and experimental results demonstrate that the MMR-EH can effectively harvest the energy from ultra-low frequency(3 Hz)and irregular *** a reciprocating vibration frequency of 10 Hz and an amplitude of 20 mm,the harvester can produce an average power of 0.29 mW.

关键词： energy harvesting vibration low frequency magnetically modulated route

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振动能量采集与振动控制序

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力学学报 2023年第10期55卷 2091-2093页

作者：张文明赵林川邹鸿翔上海交通大学机械系统与振动国家重点实验室上海200240 湖南工程学院机械工程学院湖南湘潭411104

振动是自然界中常见的现象,振动超过一定限度时,会对人体、设备和设施造成损伤.研究人员一般从两个方面处理振动:一方面采用振动控制技术,包括吸振、隔振、减振等,降低从振动源传输到主体的振动能量;另一方面采用能量采集技术,将振动能... 详细信息

振动是自然界中常见的现象,振动超过一定限度时,会对人体、设备和设施造成损伤.研究人员一般从两个方面处理振动:一方面采用振动控制技术,包括吸振、隔振、减振等,降低从振动源传输到主体的振动能量;另一方面采用能量采集技术,将振动能量转换为电能,并储存起来为低功耗电子设备供电,即能量的重新分配与利用.振动能量采集与振动控制具有相通的力学原理与方法.近年来研究者们对振动能量采集与振动控制进行了深入研究,实现自供能传感、重大装备减振降噪、自反馈振动控制等,促进我国高端智能化装备研制,助力国家“双碳”目标实现.

关键词：振动能量采集振动控制设备供电振动源减振降噪自反馈自供能

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机械能量采集动力学调控方法

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力学学报 2023年第10期55卷 2094-2114页

作者：赵林川陈泽文邹鸿翔孟光张文明上海交通大学机械系统与振动全国重点实验室上海200240 湖南工程学院机械工程学院湖南湘潭411104 长沙理工大学汽车与机械工程学院长沙410114

机械能量采集是将环境中分散和无序的低品质高熵机械能转换为电能,可以为广泛分布的传感器等低功耗电子器件供电实现自供能物联网,具有灵活、便捷、可持续和零碳环保的优势,能够广泛应用于生态环境监测、基础设施健康状态监测和设备状... 详细信息

机械能量采集是将环境中分散和无序的低品质高熵机械能转换为电能,可以为广泛分布的传感器等低功耗电子器件供电实现自供能物联网,具有灵活、便捷、可持续和零碳环保的优势,能够广泛应用于生态环境监测、基础设施健康状态监测和设备状态监测等,是国际前沿研究热点.但是,目前机械能量采集存在输出功率低、工作频带窄、低频效果差、环境适应性差和可靠性低等制约其实际应用的关键难题.机械能量采集动力学调控方法能够改善机械能量采集系统的动力学性能,使其与特定的环境激励相匹配,提升系统的输出电学性能.文章构建了机械能量采集动力学调控方法体系,包括激励调制、非线性系统、多自由度系统、自适应控制和策略调控等方法;论述了动力学调控方法的最新研究进展,包括每类动力学调控方法的特点和典型设计;最后,总结了动力学调控方法的关键挑战,并预测了未来发展方向.为机械能量采集系统适应复杂环境激励提供了新的动力学调控视角,有益于促进机械能量采集理论与技术的发展.

关键词：动力学调控能量采集机械能自供能技术

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压电与摩擦电复合型旋转能量采集动力学协同调控机制研究

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力学学报 2021年第11期53卷 2961-2971页

作者：赵林川邹鸿翔刘丰瑞魏克湘张文明上海交通大学机械系统与振动国家重点实验室上海200240 湖南工程学院汽车动力与传动系统湖南省重点实验室湖南湘潭411201

低转速激励下能量采集性能差是目前制约旋转能量采集技术应用的瓶颈问题.本文提出了动力学协同调控机制,并用于调控系统的动力学行为,可以使器件在低转速激励下有效工作,提高了旋转能量采集系统的电学性能.旋转刚度软化、非线性磁力、... 详细信息

低转速激励下能量采集性能差是目前制约旋转能量采集技术应用的瓶颈问题.本文提出了动力学协同调控机制,并用于调控系统的动力学行为,可以使器件在低转速激励下有效工作,提高了旋转能量采集系统的电学性能.旋转刚度软化、非线性磁力、几何边界的协同调控既可以增加系统在低速下的振动位移以及压电材料的形变,也可调控系统的最大位移,使其振动可控并限制位移过大提高可靠性.此外,几何边界可以方便地集成摩擦纳米发电机,实现压电与摩擦两种机电转换机制在振动和碰撞过程中协同发电,有效利用空间和提高输出电能.基于哈密顿原理建立了系统的机电耦合动力学模型并进行了实验验证.实验结果表明系统能够在0~250 r/min的低转速范围内有效工作,在转速为250 r/min时,压电单元和摩擦纳米发电机的最大峰峰值电压分别为132 V和1128 V,总平均功率为1426μW.本文提出的动力学协同调控机制为能量采集系统动力学和电学性能改进提供新的途径,有益于促进自供能物联网技术的发展与应用.

关键词：动力学设计协同调控刚度软化旋转能量采集

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