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学者姓名：刘扭扭
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Abstract ：
Passive vibration isolation techniques with low-frequency characteristics have been a hot topic in the aerospace field. A hydraulic inertial vibration isolator is a highly effective type of isolator for controlling low-frequency vibrations. It typically consists of a main spring, a minor spring, an inertial mass, and a fluid domain. Due to its multi-domain nature, analyzing the isolation mechanism of this type of isolator is challenging. The bond graph method is employed to establish the dynamic model of the isolator. Subsequently, the state equations of the isolator are derived, and the energy equations of both the mechanical and the fluid parts of the isolator are obtained. Based on this, the energy transfer characteristics between the mechanical and fluid domains inside the isolator under external excitation are discussed. The time-domain response of the forces transmitted to the foundation is analyzed. It is shown that the anti-resonance frequency occurs when the forces transmitted to the foundation generated by the main spring and the fluid pressure are equal to that of the minor spring. To verify the proposed method’s correctness, a prototype of the isolator is designed and a carefully designed experiment is conducted. The acceleration transmissibility of the isolator is used to conduct a comparative study. The results show that the theoretical results are in good agreement with the experimental results. To depict the dynamic characteristics of the isolator under large amplitude vibration, the nonlinear dynamic model of the isolator is developed, and the corresponding force transmissibility of the isolator is formulated. The energy flow between the mechanical and the fluid domains under this condition is also analyzed. The results indicate that the energy flow responses exhibit a similar change tendency to the force transmissibility. However, the peak of the energy ratio between the mechanical subsystem and the fluid is the same as the linear condition, suggesting that this value is determined by the amplification ratio of the isolator. This research provides enhanced physical insight to understand the dynamic characteristics of this type of isolator and will help to shorten the design cycle of the isolator. © 2024 by the authors.
Keyword ：
acceleration transmissibility acceleration transmissibility bond graph bond graph energy transfer energy transfer hydraulic inertial isolator hydraulic inertial isolator multi-energy-domain multi-energy-domain
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| GB/T 7714 | Liu, N. , Li, C. , Zhang, L. et al. The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects [J]. | Aerospace , 2024 , 11 (8) . |
| MLA | Liu, N. et al. "The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects" . | Aerospace 11 . 8 (2024) . |
| APA | Liu, N. , Li, C. , Zhang, L. , Lei, Z. , Yang, J. , Lai, F. . The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects . | Aerospace , 2024 , 11 (8) . |
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Purpose: In order to improve the isolation capability of the longitudinal vibration of the shafting system in the low frequency range, a lever-type isolator with negative stiffness (LTINS) was proposed. Methods: The LTINS arranged in parallel with the thrust bearing to isolate the longitudinal fluctuating force transmitted from the propeller-shaft to its foundation. The Rayleigh–Ritz method is used to establish the longitudinal dynamic model of the propeller-shaft-LTINS system. Results: The force transmissibility of the coupled system is formulated, and computed results are compared with those solutions obtained from the finite element method. A stability analysis is carried out based on the equivalent static and dynamic stiffness of the thrust bearing of the shafting system. A comparison study is conducted to compare the isolation performance of the proposed isolator with the traditional isolator such as the dynamic anti-resonance vibration isolator (DAVI), absorber such as the dynamic vibration absorber (DVA), and dynamic vibration absorber with negative stiffness (DVANS). Parametric optimization is carried out to investigate the impact of the parameters of the LTINS on its isolation performance. Conclusion: The results indicated that the proposed control method can achieve a much wider bandwidth than that of the traditional vibration control scheme with a much smaller mass ratio. © Springer Nature Singapore Pte Ltd. 2024.
Keyword ：
Axial vibration control Axial vibration control Lever-type isolator with negative stiffness Lever-type isolator with negative stiffness Rayleigh–Ritz method Rayleigh–Ritz method Shafting system Shafting system Thrust bearing Thrust bearing
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| GB/T 7714 | Liu, N. , Lei, X. , Lin, F. et al. Longitudinal Vibration Transmission Suppression for Propeller-Shaft System by a Lever-Type Isolator with Negative Stiffness [J]. | Journal of Vibration Engineering and Technologies , 2024 , 12 (Suppl 1) : 949-965 . |
| MLA | Liu, N. et al. "Longitudinal Vibration Transmission Suppression for Propeller-Shaft System by a Lever-Type Isolator with Negative Stiffness" . | Journal of Vibration Engineering and Technologies 12 . Suppl 1 (2024) : 949-965 . |
| APA | Liu, N. , Lei, X. , Lin, F. , Zhang, L. , Yang, J. . Longitudinal Vibration Transmission Suppression for Propeller-Shaft System by a Lever-Type Isolator with Negative Stiffness . | Journal of Vibration Engineering and Technologies , 2024 , 12 (Suppl 1) , 949-965 . |
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The longitudinal fluctuating forces of a propeller are a major cause of sound radiation of an underwater vehicle in the low frequency range. A hydraulic leveraged dynamic anti-resonance vibration isolator (HLVI) is proposed to attenuate the longitudinal vibration of a shaft system transmitted to the hull. The semi-analytical model of the shafting system with and without the isolator is set up by employing the frequency response synthesis method, in which the elasticity of the foundation is taken into consideration. Compared to the traditional isolation scheme and DVA, the proposed control scheme will not change the longitudinal effective stiffness and needs a small mass to attenuate the longitudinal vibration of the shafting system. A parametric study was conducted to investigate the key parameters of the isolator and their impact on its isolation performance. An experimental apparatus is set up to validate the isolation scheme. The acceleration frequency response results of the shafting system under axial excitation with both the frequency sweep method and discrete sinusoidal frequencies are presented and discussed. The results indicate that the proposed method is capable of attenuating the corresponding longitudinal vibration of the shafting system.
Keyword ：
Hydraulic leveraged dynamic anti-resonance vibration isolator Hydraulic leveraged dynamic anti-resonance vibration isolator longitudinal vibration isolation longitudinal vibration isolation resonance changer resonance changer semi-analytical model semi-analytical model shafting system shafting system
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| GB/T 7714 | Liu, Niuniu , Lei, Xianliang , Xue, Xin . Longitudinal low-frequency vibration control of a propeller-shafting system using a hydraulic leveraged dynamic anti-resonance vibration isolator: A theoretical and experimental study [J]. | JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL , 2024 , 43 (3) : 1261-1278 . |
| MLA | Liu, Niuniu et al. "Longitudinal low-frequency vibration control of a propeller-shafting system using a hydraulic leveraged dynamic anti-resonance vibration isolator: A theoretical and experimental study" . | JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL 43 . 3 (2024) : 1261-1278 . |
| APA | Liu, Niuniu , Lei, Xianliang , Xue, Xin . Longitudinal low-frequency vibration control of a propeller-shafting system using a hydraulic leveraged dynamic anti-resonance vibration isolator: A theoretical and experimental study . | JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL , 2024 , 43 (3) , 1261-1278 . |
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A lever-enhanced negative stiffness isolator (LENSI) is proposed to attenuate the longitudinal vibration of a shaft-plate coupled system in the low-frequency range. The isolator comprises a rigid lever, an isolator mass and a negative stiffness element, installed in parallel with the thrust bearing. The dynamic model of the shaft-plate coupled system is formulated using the Rayleigh-Ritz method. Longitudinal acceleration frequency response of the bearing pedestal and mean square velocity of the plate are used to evaluate the isolation performance of the proposed isolator. By comparing the isolation performance of LENSI with traditional isolator such as dynamic anti-resonance isolator (DAVI) or absorber such as dynamic vibration absorber with negative stiffness (DVANS), the superiority of the LENSI is demonstrated. A parametric study is presented to clarify the influence of the isolator parameters on its isolation performance. It is shown that the LENSI is capable of isolate the longitudinal vibration of the shaft-plate coupled system with a much lower mass ratio in the low-frequency range.
Keyword ：
Lever-enhanced negative stiffness isolator (LENSI) Lever-enhanced negative stiffness isolator (LENSI) Longitudinal vibration transmission control Longitudinal vibration transmission control Rayleigh-Ritz method Rayleigh-Ritz method Shaft-plate coupled system Shaft-plate coupled system
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| GB/T 7714 | Liu, Niuniu , Lin, Fuming , Lei, Xianliang et al. Longitudinal Vibration Control of A Shaft-plate Coupled System with A Lever-enhanced Negative Stiffness Isolator [J]. | PROCEEDINGS OF THE 2024 3RD INTERNATIONAL SYMPOSIUM ON INTELLIGENT UNMANNED SYSTEMS AND ARTIFICIAL INTELLIGENCE, SIUSAI 2024 , 2024 : 193-198 . |
| MLA | Liu, Niuniu et al. "Longitudinal Vibration Control of A Shaft-plate Coupled System with A Lever-enhanced Negative Stiffness Isolator" . | PROCEEDINGS OF THE 2024 3RD INTERNATIONAL SYMPOSIUM ON INTELLIGENT UNMANNED SYSTEMS AND ARTIFICIAL INTELLIGENCE, SIUSAI 2024 (2024) : 193-198 . |
| APA | Liu, Niuniu , Lin, Fuming , Lei, Xianliang , Zhang, Liwei , Yang, Jing . Longitudinal Vibration Control of A Shaft-plate Coupled System with A Lever-enhanced Negative Stiffness Isolator . | PROCEEDINGS OF THE 2024 3RD INTERNATIONAL SYMPOSIUM ON INTELLIGENT UNMANNED SYSTEMS AND ARTIFICIAL INTELLIGENCE, SIUSAI 2024 , 2024 , 193-198 . |
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Under severe work conditions, mechanical parts made of beryllium-copper alloy may undergo fatigue failure, which seriously affects the overall service life of the equipment. Therefore, improving the fatigue resistance of such kind of alloys is of great significance for their engineering application. In this research, C17200 beryllium-copper alloy was surface strengthened by means of a self-designed surface mechanical rolling treatment (SMRT) device. The fatigue behavior before and after SMRT was investigated using a ball-on-rod rolling contact fatigue (RCF) machine, and surface failure mechanisms were analyzed. It was found that the RCF resistance of the untreated C17200 alloy was weakened with the increase in the maximum Hertzian contact stress (sigma max). After surface treatment, C17200 alloy exhibited superior RCF resistance subjected to SMRT with a static rolling force of 200 N. But among the specimens treated by SMRT, the RCF resistance of beryllium-copper alloys was weakened with the increase in the SMRT static rolling force. The RCF life of specimens treated by SMRT with a force of 400 N is similar to that of untreated specimens, while the RCF lives of specimens treated by SMRT with a force of 735 and 980 N are even lower than that of untreated specimens. Thus, applying the appropriate static rolling force during SMRT can improve the surface quality and compressive residual stress, as well as enhance the fatigue resistance of C17200 alloys.
Keyword ：
beryllium-copper alloy beryllium-copper alloy crack propagation crack propagation fatigue resistance evaluation fatigue resistance evaluation rolling contact fatigue behavior rolling contact fatigue behavior surface mechanical rolling treatment surface mechanical rolling treatment
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| GB/T 7714 | Lai, Fuqiang , Cao, Changsheng , Mao, Kun et al. Rolling Contact Fatigue Behaviors of C17200 Beryllium-Copper Alloy Processed by Surface Mechanical Rolling Treatment [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2024 . |
| MLA | Lai, Fuqiang et al. "Rolling Contact Fatigue Behaviors of C17200 Beryllium-Copper Alloy Processed by Surface Mechanical Rolling Treatment" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2024) . |
| APA | Lai, Fuqiang , Cao, Changsheng , Mao, Kun , Hu, Anqiong , Li, Xiaopeng , Fu, Lihua et al. Rolling Contact Fatigue Behaviors of C17200 Beryllium-Copper Alloy Processed by Surface Mechanical Rolling Treatment . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2024 . |
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Abstract ：
Passive vibration isolation techniques with low-frequency characteristics have been a hot topic in the aerospace field. A hydraulic inertial vibration isolator is a highly effective type of isolator for controlling low-frequency vibrations. It typically consists of a main spring, a minor spring, an inertial mass, and a fluid domain. Due to its multi-domain nature, analyzing the isolation mechanism of this type of isolator is challenging. The bond graph method is employed to establish the dynamic model of the isolator. Subsequently, the state equations of the isolator are derived, and the energy equations of both the mechanical and the fluid parts of the isolator are obtained. Based on this, the energy transfer characteristics between the mechanical and fluid domains inside the isolator under external excitation are discussed. The time-domain response of the forces transmitted to the foundation is analyzed. It is shown that the anti-resonance frequency occurs when the forces transmitted to the foundation generated by the main spring and the fluid pressure are equal to that of the minor spring. To verify the proposed method's correctness, a prototype of the isolator is designed and a carefully designed experiment is conducted. The acceleration transmissibility of the isolator is used to conduct a comparative study. The results show that the theoretical results are in good agreement with the experimental results. To depict the dynamic characteristics of the isolator under large amplitude vibration, the nonlinear dynamic model of the isolator is developed, and the corresponding force transmissibility of the isolator is formulated. The energy flow between the mechanical and the fluid domains under this condition is also analyzed. The results indicate that the energy flow responses exhibit a similar change tendency to the force transmissibility. However, the peak of the energy ratio between the mechanical subsystem and the fluid is the same as the linear condition, suggesting that this value is determined by the amplification ratio of the isolator. This research provides enhanced physical insight to understand the dynamic characteristics of this type of isolator and will help to shorten the design cycle of the isolator.
Keyword ：
acceleration transmissibility acceleration transmissibility bond graph bond graph energy transfer energy transfer hydraulic inertial isolator hydraulic inertial isolator multi-energy-domain multi-energy-domain
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| GB/T 7714 | Liu, Niuniu , Li, Cheng , Zhang, Liwei et al. The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects [J]. | AEROSPACE , 2024 , 11 (8) . |
| MLA | Liu, Niuniu et al. "The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects" . | AEROSPACE 11 . 8 (2024) . |
| APA | Liu, Niuniu , Li, Cheng , Zhang, Liwei , Lei, Zhiyang , Yang, Jing , Lai, Fuqiang . The Bond Graph Modeling and Experimental Verification of a Hydraulic Inertial Vibration Isolator Including Nonlinear Effects . | AEROSPACE , 2024 , 11 (8) . |
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Abstract ：
PurposeIn order to improve the isolation capability of the longitudinal vibration of the shafting system in the low frequency range, a lever-type isolator with negative stiffness (LTINS) was proposed.MethodsThe LTINS arranged in parallel with the thrust bearing to isolate the longitudinal fluctuating force transmitted from the propeller-shaft to its foundation. The Rayleigh-Ritz method is used to establish the longitudinal dynamic model of the propeller-shaft-LTINS system.ResultsThe force transmissibility of the coupled system is formulated, and computed results are compared with those solutions obtained from the finite element method. A stability analysis is carried out based on the equivalent static and dynamic stiffness of the thrust bearing of the shafting system. A comparison study is conducted to compare the isolation performance of the proposed isolator with the traditional isolator such as the dynamic anti-resonance vibration isolator (DAVI), absorber such as the dynamic vibration absorber (DVA), and dynamic vibration absorber with negative stiffness (DVANS). Parametric optimization is carried out to investigate the impact of the parameters of the LTINS on its isolation performance.ConclusionThe results indicated that the proposed control method can achieve a much wider bandwidth than that of the traditional vibration control scheme with a much smaller mass ratio.
Keyword ：
Axial vibration control Axial vibration control Lever-type isolator with negative stiffness Lever-type isolator with negative stiffness Rayleigh-Ritz method Rayleigh-Ritz method Shafting system Shafting system Thrust bearing Thrust bearing
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| GB/T 7714 | Liu, Niuniu , Lei, Xianliang , Lin, Fuming et al. Longitudinal Vibration Transmission Suppression for Propeller-Shaft System by a Lever-Type Isolator with Negative Stiffness [J]. | JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES , 2024 , 12 (SUPPL 1) : 949-965 . |
| MLA | Liu, Niuniu et al. "Longitudinal Vibration Transmission Suppression for Propeller-Shaft System by a Lever-Type Isolator with Negative Stiffness" . | JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES 12 . SUPPL 1 (2024) : 949-965 . |
| APA | Liu, Niuniu , Lei, Xianliang , Lin, Fuming , Zhang, Liwei , Yang, Jing . Longitudinal Vibration Transmission Suppression for Propeller-Shaft System by a Lever-Type Isolator with Negative Stiffness . | JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES , 2024 , 12 (SUPPL 1) , 949-965 . |
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Abstract ：
传统数学建模方法不能直接构建液压式动力反共振隔振器机液耦合能域系统的动力学模型,无法清晰反映其内部能量传递过程及内部液体与固体之间的交互作用。本文基于键合图理论详细阐述了该隔振器机械能域和液压能域子系统模型的建模过程以及机液能域耦合的技术方法,分析了共振频率点及反共振频率点处隔振器内部的机-液能量传递过程,计算了不同参数下隔振器的力传递特性。分析结果显示惯性质量的振幅在反共振频率点处远大于其共振频率点处的振幅,表明了隔振器的振动能量转移特点,同时由于机-液交互作用所产生的体积刚度对隔振器的传递特性影响很大,在实际分析时,必须予以考虑。为验证所建模型的正确性,本文研制了隔振器原理样机并搭建了隔振器实验平台,利用电磁振动台测试了隔振器的振动传递特性。对比结果表明,本文所建模型的计算结果与实验结果吻合良好,证明了本文所提出的动力学模型的合理性及有效性。该模型对于深入理解液压式动力反共振隔振器内部能量传递过程与结构优化设计具有很好的指导意义。
Keyword ：
力传递率 力传递率 液压式动力反共振隔振器 液压式动力反共振隔振器 能量传递 能量传递 键合图 键合图
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| GB/T 7714 | 刘扭扭 , 李成 , 沈茂盛 et al. 基于键合图的液压式动力反共振隔振特性分析 [C] //第十九届全国非线性振动暨第十六届全国非线性动力学和运动稳定性学术会议（NVND2023） . 2023 . |
| MLA | 刘扭扭 et al. "基于键合图的液压式动力反共振隔振特性分析" 第十九届全国非线性振动暨第十六届全国非线性动力学和运动稳定性学术会议（NVND2023） . (2023) . |
| APA | 刘扭扭 , 李成 , 沈茂盛 , 雷显良 . 基于键合图的液压式动力反共振隔振特性分析 第十九届全国非线性振动暨第十六届全国非线性动力学和运动稳定性学术会议（NVND2023） . (2023) . |
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本发明提供一种液压式惯容器非线性能量阱隔振装置，包括基座以及设置在基座上的大波纹管，所述大波纹管上端设有主质量块，所述大波纹管内部设置有小波纹管，所述小波纹管顶部密封设有至少一个惯性质量块，所述惯性质量块下方中部设置有向下延伸出小波纹管的支撑杆，所述基座侧下部设置有可沿基座径向移动的滑块，所述滑块与支撑杆之间设置有用以实现振动隔离的变刚度结构。本发明设计合理，构造简单，通过在惯性质量块与隔振器底座之间设置变刚度结构，解决了使用小的质量占比实现宽频吸振，将其应用于低频宽带减振，参数调节方便，能在长时间内稳定可靠地工作。
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| GB/T 7714 | 刘扭扭 , 雷显良 , 郑荣健 . 一种液压式惯容器非线性能量阱隔振装置及其工作方法 : CN202210548048.0[P]. | 2022-05-20 00:00:00 . |
| MLA | 刘扭扭 et al. "一种液压式惯容器非线性能量阱隔振装置及其工作方法" : CN202210548048.0. | 2022-05-20 00:00:00 . |
| APA | 刘扭扭 , 雷显良 , 郑荣健 . 一种液压式惯容器非线性能量阱隔振装置及其工作方法 : CN202210548048.0. | 2022-05-20 00:00:00 . |
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This work aims to analyze the heat transfer characteristics of a sandwich cylindrical shell with a metal-rubber core (SCS-MR) using both finite element analysis and experimental techniques. The SCS-MR is a lightweight and high-temperature resistant material that is suitable for construction in environments with varying condi-tions, such as rocket launchers, aircraft injectors and ships. The heat transfer, heat flux, and thermal convection loss were first analyzed using thermal resistance and Fourier law. Subsequently, a representative volume element of the SCS-MR was established to simulate thermal transfer, followed by a series of comparative experiments that measured the temperature gradients, the boundary conditions, and the density of the SCS-MR. Additionally, three types of metal spirals were examined using differential scanning calorimeter (DSC). The convective thermal conductivity, heat flux, and heat convection loss of the SCS-MR were analyzed experimentally, revealing that the metal spiral exhibited an exothermic peak in the DSC. Furthermore, the heat transfer rate of the SCS-MR was faster than that of the solid cylindrical shell (CS) when the set temperature was reached. The insulation cover was capable of providing boundary conditions to minimize the impact of natural convection. In the high-temperature environment, the thermal conductivity decreased with increasing density of the scaled model SCS-MR.
Keyword ：
Heat transfer Heat transfer Metal rubber Metal rubber Porous medium Porous medium Sandwich layer Sandwich layer Thermal conductivity Thermal conductivity
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| GB/T 7714 | Xue, Xin , Xiong, Yunlingzi , Wu, Fang et al. Analysis of heat transfer characteristics of a sandwich cylindrical shell with a metal-rubber core [J]. | APPLIED THERMAL ENGINEERING , 2023 , 230 . |
| MLA | Xue, Xin et al. "Analysis of heat transfer characteristics of a sandwich cylindrical shell with a metal-rubber core" . | APPLIED THERMAL ENGINEERING 230 (2023) . |
| APA | Xue, Xin , Xiong, Yunlingzi , Wu, Fang , Wu, Ruixian , Liu, Niuniu . Analysis of heat transfer characteristics of a sandwich cylindrical shell with a metal-rubber core . | APPLIED THERMAL ENGINEERING , 2023 , 230 . |
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