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学者姓名：刘扭扭
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Abstract ：
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 等. "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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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 . |
| 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 (2024) . |
| 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 . |
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In this study, the creep properties of cylindrical metal rubber (MR) specimen under static compression at elevated temperatures were investigated by a series of creep experiments. The cylindrical MR specimen has a good symmetrical property, and the mechanical properties are consistent in its different axial section. The failure determination parameters of MR under the coupling of thermal and mechanical static load of the forming direction were proposed in four aspects: the overall height, the average stiffness, the energy dissipation, and the variation of the loss factor. The variation patterns of the properties of the MR specimens were investigated with a static load at different temperatures for 324 h. The analytical equipment, including the simultaneous thermal analyzer (TGA/DSC), X-ray diffractometer (XRD), and scanning electron microscope (SEM), were used for material characterization and failure analysis. Based on the results, it is found that there are significant differences in the MR property variations subjected to creep tests at different elevated temperatures. The results indicated that an appropriate heat treatment for MR specimens would improve the creep resistance at elevated temperatures. In addition, the overall height and energy dissipation of the MR specimens were increased, and the average stiffness and the loss factor were decreased under the creep tests at 200 degrees C and 250 degrees C. However, under the creep tests at 25 degrees C, 300 degrees C, 350 degrees C, and 400 degrees C, the overall height, the energy dissipation and the loss factor were decreased, but the average stiffness was increased.
Keyword ：
creep properties creep properties failure determination parameters failure determination parameters metal rubber metal rubber thermal mechanical coupling thermal mechanical coupling
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| GB/T 7714 | Lai, Fuqiang , Hao, Xiangfei , Liu, Niuniu et al. Creep Properties of Cylinder Metal Rubber under Static Compression at Elevated Temperatures [J]. | SYMMETRY-BASEL , 2023 , 15 (2) . |
| MLA | Lai, Fuqiang et al. "Creep Properties of Cylinder Metal Rubber under Static Compression at Elevated Temperatures" . | SYMMETRY-BASEL 15 . 2 (2023) . |
| APA | Lai, Fuqiang , Hao, Xiangfei , Liu, Niuniu , Wu, Yiwan , Xue, Xin , Bai, Hongbai . Creep Properties of Cylinder Metal Rubber under Static Compression at Elevated Temperatures . | SYMMETRY-BASEL , 2023 , 15 (2) . |
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针对船舶推进轴系纵向低频隔振难的问题,将具备负刚度特性的碟簧与正刚度螺旋弹簧并联,设计了一种高承载准零刚度隔振器.建立了轴系-准零刚度隔振系统的动力学方程,利用谐波平衡法求解了系统的稳态响应,并用数值方法验证了求解的有效性.对于系统响应稳定性的问题,首先研究了准零刚度隔振器的非线性刚度、外激励力幅值对系统响应稳定性的影响规律,并结合推进轴系的纵向静变形限制,确定了非线性刚度取值;其次基于静力学理论设计了一组碟簧与螺旋弹簧的结构参数;最后分析了准零刚度隔振器的阻尼比、外激励力幅值对系统响应稳定性的影响规律,并确定了合适的阻尼比.结果表明:当非线性刚度、阻尼比分别设计为1×1012 N/m3、0.05时,系统主共振不再出现跳跃现象,稳态响应的解在200 Hz内都是稳定的;在承受10000 N载荷时,准零刚度隔振器仍然可以有效隔离10～200 Hz低频段的振动.
Keyword ：
低频隔振 低频隔振 准零刚度 准零刚度 推进轴系 推进轴系 碟簧 碟簧 稳定性 稳定性
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| GB/T 7714 | 任志英 , 邱涛 , 刘扭扭 et al. 推进轴系纵向高承载准零刚度隔振器的研究 [J]. | 郑州大学学报（工学版） , 2023 , 44 (1) : 52-57,64 . |
| MLA | 任志英 et al. "推进轴系纵向高承载准零刚度隔振器的研究" . | 郑州大学学报（工学版） 44 . 1 (2023) : 52-57,64 . |
| APA | 任志英 , 邱涛 , 刘扭扭 , 白鸿柏 , 尧杰程 , 梁翼 . 推进轴系纵向高承载准零刚度隔振器的研究 . | 郑州大学学报（工学版） , 2023 , 44 (1) , 52-57,64 . |
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Abstract ：
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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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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The wave propagation and vibration transmission in metamaterial-based elastic rods with periodically attached multi-degree-of-freedom (MDOF) dynamic anti-resonant vibration isolator (DAVI) resonators are investigated. A methodology based on a combination of the transfer matrix (TM) method and the Bloch theorem is developed, yielding an explicit formulation for the complex band structure calculation. The bandgap behavior of the periodic structure arrayed with single-degree-of-freedom (SDOF) DAVI resonators and two-degree-of-freedom (2DOF) DAVI resonators are investigated, respectively. A comparative study indicates that the structure consisting of SDOF DAVI resonators periodically jointed on the metamaterial-based elastic rod can obtain an initial locally resonant band gap 500 Hz smaller than the one given in the published literature. The periodic structure containing 2DOF DAVI resonators has an advantage over the periodic structure with SDOF DAVI resonators in achieving two resonance band gaps. By analyzing the equivalent dynamic mass of a DAVI resonator, the underlying mechanism of achieving a lower initial locally resonant band gap by this periodic structure is revealed. The parameters of the 2DOF DAVI resonator are optimized to obtain the lowest band gap of the periodic structure. The numerical results show that, with the optimal 2DOF DAVI parameters, the periodic structure can generate a much lower initial locally resonant band gap compared with the case before the optimization.
Keyword ：
DAVI resonator DAVI resonator equivalent dynamic mass equivalent dynamic mass locally resonant band gaps locally resonant band gaps phononic crystal phononic crystal
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| GB/T 7714 | Liu, Niuniu , Lei, Xianliang , Lai, Fuqiang et al. Longitudinal Wave Locally Resonant Band Gaps in Metamaterial-Based Elastic Rods Comprising Multi-Degree-of-Freedom DAVI Resonators [J]. | SYMMETRY-BASEL , 2022 , 14 (5) . |
| MLA | Liu, Niuniu et al. "Longitudinal Wave Locally Resonant Band Gaps in Metamaterial-Based Elastic Rods Comprising Multi-Degree-of-Freedom DAVI Resonators" . | SYMMETRY-BASEL 14 . 5 (2022) . |
| APA | Liu, Niuniu , Lei, Xianliang , Lai, Fuqiang , Xue, Xin . Longitudinal Wave Locally Resonant Band Gaps in Metamaterial-Based Elastic Rods Comprising Multi-Degree-of-Freedom DAVI Resonators . | SYMMETRY-BASEL , 2022 , 14 (5) . |
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Particular attention has been given to the complexity of the elastic-porous sandwich structure with entangled metallic wire mesh (EMWM), which is a novel rigid-flexible heterogeneous and symmetrical material. The orthogonal experiment design for vacuum brazing was adopted for sensitivity analysis of the key fabrication process on the performances of an EMWM sandwich structure. The shear behaviors of the sandwich structures with different vacuum brazing parameters (e.g., heating rate, brazing temperature, and holding time) were analyzed by mechanical experiments and an interfacial microstructure. The results indicated that the failure behavior of the sandwich structure could be divided into four stages in the mode-I experiment. In addition, the joint quality of the different vacuum brazing process could be shown by the mode-II experiment, and the failure behaviors involves three stages. Additionally, the failure behaviors of the sandwich structure were mainly associated with the deformation of the EMWM core and the strength of the brazing joint. In addition, the relationship between the joint strength and the shear performance of the sandwich structure was revealed through the interfacial microstructure. Furthermore, the importance of the optimized vacuum brazing parameters to fabricate the novel sandwich structure with the best joint performance was demonstrated in this work.
Keyword ：
diffusion bonding behavior diffusion bonding behavior elastic-porous sandwich structure elastic-porous sandwich structure entangled metallic wire mesh entangled metallic wire mesh orthogonal experiment design orthogonal experiment design vacuum brazing vacuum brazing
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| GB/T 7714 | Wei, Yuhan , Wu, Ruixian , Zou, Luming et al. Vacuum Brazing Effect on the Interlayer Failure Behaviors of Elastic-Porous Sandwich Structure with Entangled Metallic Wire Mesh [J]. | SYMMETRY-BASEL , 2022 , 14 (5) . |
| MLA | Wei, Yuhan et al. "Vacuum Brazing Effect on the Interlayer Failure Behaviors of Elastic-Porous Sandwich Structure with Entangled Metallic Wire Mesh" . | SYMMETRY-BASEL 14 . 5 (2022) . |
| APA | Wei, Yuhan , Wu, Ruixian , Zou, Luming , Liu, Niuniu , Xue, Xin . Vacuum Brazing Effect on the Interlayer Failure Behaviors of Elastic-Porous Sandwich Structure with Entangled Metallic Wire Mesh . | SYMMETRY-BASEL , 2022 , 14 (5) . |
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