Journal of Low Frequency Noise Vibration and Active Control最新文献_第10页

Helmholtz resonator-based acoustic metamaterials enabling broadband asymmetric sound absorption and ventilation 基于亥姆霍兹谐振器的声学超材料，可实现宽带不对称吸声和通风

IF 2.3 4区工程技术

Journal of Low Frequency Noise Vibration and Active Control Pub Date : 2023-01-12 DOI: 10.1177/14613484231151273

Deshi Meng, Lijun Li, Zhenhua Wu

{"title":"Helmholtz resonator-based acoustic metamaterials enabling broadband asymmetric sound absorption and ventilation","authors":"Deshi Meng, Lijun Li, Zhenhua Wu","doi":"10.1177/14613484231151273","DOIUrl":"https://doi.org/10.1177/14613484231151273","url":null,"abstract":"Acoustic metamaterials with both ventilation and broadband asymmetric absorption have demonstrated great scientific significance and promising applicability. In this work, we design an asymmetric absorbing cell (AAC) consisting of a pair of detuned Helmholtz resonators (HRs) connected by sound channels that allows airflow with a ventilation ratio (ventilation area divided by sound incidence area) of 40%, which can achieve near-perfect sound absorption in the operating frequency range when sound waves are incident from the left port. However, when incident on the right port, the acoustic absorption coefficient does not exceed 40% at most, so asymmetric absorption is achieved. In addition, we form parallel three-cell asymmetric absorber (PTAA) by paralleling three AACs, which have broadband asymmetric absorption compared to AAC. Furthermore, we design multi-asymmetric absorber (MAA), which can achieve broadband asymmetric absorption range from 1000 Hz to 1750 Hz, and also allow air circulation. Moreover, experimental validation is conducted to demonstrate the effectiveness of fabricated MAA by 3D printing technology. Our designs open potential possibilities for developing ventilated functional devices capable of absorbing sound asymmetrically.","PeriodicalId":56067,"journal":{"name":"Journal of Low Frequency Noise Vibration and Active Control","volume":"72 1","pages":"1242 - 1250"},"PeriodicalIF":2.3,"publicationDate":"2023-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90560782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Unsupervised structural damage detection based on an improved generative adversarial network and cloud model 基于改进生成对抗网络和云模型的无监督结构损伤检测

IF 2.3 4区工程技术

Journal of Low Frequency Noise Vibration and Active Control Pub Date : 2023-01-12 DOI: 10.1177/14613484221150804

Yong-peng Luo, Xu Guo, Lin-kun Wang, Jin-ling Zheng, Jingliang Liu, Fei-yu Liao

{"title":"Unsupervised structural damage detection based on an improved generative adversarial network and cloud model","authors":"Yong-peng Luo, Xu Guo, Lin-kun Wang, Jin-ling Zheng, Jingliang Liu, Fei-yu Liao","doi":"10.1177/14613484221150804","DOIUrl":"https://doi.org/10.1177/14613484221150804","url":null,"abstract":"The measurements derived from damaged conditions are difficult to acquire in actual structures, which limits the applicability of supervised damage detection methods. In this study, an unsupervised damage detection method that leverages an improved generative adversarial network (IGAN) and cloud model (CM) is proposed. This method only needs the data in the healthy state of the structure for model training, which can solve the above problems. Firstly, an IGAN model is established, which uses the encoder-decoder-encoder generative network to encode, reconstruct and re-encode the structural response in healthy state. The essential features hidden in complex data are learned by minimizing the distance between the real response and the reconstructed response, and the distance between the latent vectors obtained after two different encodings. During the test phase, when unknown state data is input into the model, the differences of the latent features of the two different codes can be used to preliminarily judge whether the structure is damaged. In addition, CM theory is used to further quantify structural damage and solve the problem of damage misjudgment caused by measurement noise, model parameters, feature selection, and other uncertain factors. The effectiveness of the proposed damage detection method is verified by Phase I IASC-ASCE benchmark structure and a bridge health monitoring benchmark model. The results prove that the proposed method can accurately detect the damage that has occurred.","PeriodicalId":56067,"journal":{"name":"Journal of Low Frequency Noise Vibration and Active Control","volume":"11 1","pages":"1501 - 1518"},"PeriodicalIF":2.3,"publicationDate":"2023-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87487325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Free vibration of a taut cable with internal high damping rubber dampers and an external negative stiffness damper 具有内部高阻尼橡胶阻尼器和外部负刚度阻尼器的拉紧电缆的自由振动

IF 2.3 4区工程技术

Journal of Low Frequency Noise Vibration and Active Control Pub Date : 2023-01-11 DOI: 10.1177/14613484221126365

Yang Liu, Yang Xu, Zhi-hao Wang

{"title":"Free vibration of a taut cable with internal high damping rubber dampers and an external negative stiffness damper","authors":"Yang Liu, Yang Xu, Zhi-hao Wang","doi":"10.1177/14613484221126365","DOIUrl":"https://doi.org/10.1177/14613484221126365","url":null,"abstract":"Frequent vibration events on the long stay cables highlight the need to control their multi-mode vibrations. Compared to commonly used viscous dampers for cable vibration control, the negative stiffness damper (NSD) demonstrates its superior performance. However, a single NSD is incapable of providing sufficient supplemental damping for a super-long cable, especially for the multi-mode vibration mitigation. The combined internal high damping rubber (HDR) dampers and the external NSD for cable vibration control is proposed to achieve better multi-mode control performance in this study. First, the complex modal analysis of a taut cable coupled with an external NSD and two internal HDR dampers is conducted to reveal the coupling performance of the damping system. The asymptotic and iterative solutions of transcendental equation obtained in complex modal analysis are derived, respectively. Subsequently, the comparison of asymptotic and iterative solutions verifies the applicability of asymptotic solutions. Finally, parametric studies are performed to investigate the effect of the parameters of NSD and the coupling configuration on their combined control performance. Results show that the coupling schemes with different configurations can possess a wider effective modal range or a better damping effect in the narrower modal ranges according to different damping targets. It provides a diversified solution for multi-mode damping enhancement of stay cables.","PeriodicalId":56067,"journal":{"name":"Journal of Low Frequency Noise Vibration and Active Control","volume":"26 1","pages":"1018 - 1034"},"PeriodicalIF":2.3,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83530626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Vibration alleviation for wind turbine gearbox with flexible suspensions based on modal interaction 基于模态相互作用的风电齿轮箱柔性悬架减振研究

IF 2.3 4区工程技术

Journal of Low Frequency Noise Vibration and Active Control Pub Date : 2023-01-10 DOI: 10.1177/14613484221145183

Jiale Peng, Yushu Bian, Dongbo Tian, P. Liu, Zhihui Gao

{"title":"Vibration alleviation for wind turbine gearbox with flexible suspensions based on modal interaction","authors":"Jiale Peng, Yushu Bian, Dongbo Tian, P. Liu, Zhihui Gao","doi":"10.1177/14613484221145183","DOIUrl":"https://doi.org/10.1177/14613484221145183","url":null,"abstract":"Wind turbine drivetrains play a fundamental role in converting wind power into electrical energy. The gearbox is one of the most important and expensive components in a wind turbine drivetrain. Since flexible suspensions mounted on the gearbox are mainly designed for isolating vibration transfer to other turbine components, the gearbox itself still suffers from complicated whole-body vibration. In view of this, a vibration absorption method based on modal interaction is put forward to alleviate the whole-body vibration of the wind turbine gearbox with flexible suspensions. A vibration absorber with adjustable control parameters is utilized to establish modal coupling with the wind turbine gearbox. Internal resonance is analyzed and used to construct a modal interaction mechanism between the vibration absorber mode and the controlled gearbox mode. With the help of modal interaction, the vibration energy of the controlled gearbox mode is successfully absorbed by the vibration absorber mode and effectively dissipated by the damping of the vibration absorber mode. Through numerical simulations and virtual prototyping simulations, its vibration alleviation performance is verified. Since the proposed method is designed in terms of the controlled mode of the wind turbine gearbox rather than external excitations, it is suitable for applications in a complicated working environment. Besides, the proposed method aims to transfer and dissipate vibration energy through nonlinear modal interaction rather than suppress vibration via external energy, and thus can effectively deal with strong vibration problems. More importantly, it can easily work together with the existing vibration isolation method and further alleviate the whole-body vibration of the gearbox. This research will contribute to improving the reliability and service life of wind turbine gearboxes.","PeriodicalId":56067,"journal":{"name":"Journal of Low Frequency Noise Vibration and Active Control","volume":"320 1","pages":"1390 - 1418"},"PeriodicalIF":2.3,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76284927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A novel technique to obtain a time-delayed vibration control analytical solution with simulation of He’s formula 本文提出了一种利用何氏公式模拟求解时滞振动控制解析解的新方法

IF 2.3 4区工程技术

Journal of Low Frequency Noise Vibration and Active Control Pub Date : 2023-01-04 DOI: 10.1177/14613484221149518

Y. El‐Dib, N. S. Elgazery, Nada S Gad

引用次数: 6

Structural health monitoring based on the cumulative function and cumulative circle of a defective beam under a moving load 基于运动荷载作用下缺陷梁累积函数和累积圆的结构健康监测

IF 2.3 4区工程技术

Journal of Low Frequency Noise Vibration and Active Control Pub Date : 2022-12-27 DOI: 10.1177/14613484221148048

Thanh Q. Nguyen, Tuan-Anh Nguyen, Thuy T. Nguyen

{"title":"Structural health monitoring based on the cumulative function and cumulative circle of a defective beam under a moving load","authors":"Thanh Q. Nguyen, Tuan-Anh Nguyen, Thuy T. Nguyen","doi":"10.1177/14613484221148048","DOIUrl":"https://doi.org/10.1177/14613484221148048","url":null,"abstract":"A defective structure has been evaluated and identified in beam models’ deflection measurement signals in much research. However, many results have not been optimally exploited and evaluated to find new parameters for data excavation. This manuscript proposes a cumulative welding model and a cumulative circle of deflection signals for a defective beam under the impact of a moving force. Based on this evaluation model, the manuscript recognizes that the speed of the moving force will determine the regression speed of the received datasets, which is considered the basis for showing the working ability of a beam structure with defects. Moreover, the structure’s cumulative regression circle also shows its resilience in that structure after the impact of the load. The development of defects in the structure will depend on both the structure’s level and resilience after each bearing-load cycle. Our research has shown us that the method of evaluation and use of both the cumulative model and cumulative circle from the deflection’s measured value have yielded more results compared to the previous method. This research can evaluate many defects in different situations while simultaneously evaluating many types of structures.","PeriodicalId":56067,"journal":{"name":"Journal of Low Frequency Noise Vibration and Active Control","volume":"34 1","pages":"729 - 745"},"PeriodicalIF":2.3,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74068534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of super-harmonic resonance and periodic motion transition of fractional nonlinear vibration isolation system 分数阶非线性隔振系统的超谐波共振及周期运动过渡分析

IF 2.3 4区工程技术

Journal of Low Frequency Noise Vibration and Active Control Pub Date : 2022-12-26 DOI: 10.1177/14613484221135866

Minghe Qu, Qing Yang, Shaopei Wu, Wangcai Ding, Jie Li, Guofang Li

{"title":"Analysis of super-harmonic resonance and periodic motion transition of fractional nonlinear vibration isolation system","authors":"Minghe Qu, Qing Yang, Shaopei Wu, Wangcai Ding, Jie Li, Guofang Li","doi":"10.1177/14613484221135866","DOIUrl":"https://doi.org/10.1177/14613484221135866","url":null,"abstract":"The precision instruments and equipment are often utilized in low-frequency and micro-amplitude vibration systems, in which many vibration isolators of rubber materials are widely used. Ignoring the low-frequency amplitude will result in errors in the fatigue life design of the vibration isolators and predicting the dynamic response of each frequency band accurately becomes necessary. However, integer-order models cannot describe the frequency dependence of rubber materials, while the fractional-order models can describe it instead. On the other hand, the elastic restoring force is strongly nonlinear under large deformation, and the vibration of the nonlinear system contains multiple harmonic components. In order to solve those issues, the fractional nonlinear Nishimura model is used to characterize the constitutive relation of vibration isolators such as air springs, which are made of carbon black filled natural rubber. The high-order harmonic balance method is used to obtain the steady-state response of the vibration system, while the fourth-order Runge–Kutta method is applied to simulate the dynamic response of the system in the low-frequency region, and the Lyapunov exponent is used to determine the stability of the system. Furthermore, the influence of parameters on the amplitude–frequency characteristics of different frequency bands is also studied, and a method to solve the optimal damping coefficient is proposed based on the primary resonance amplitude–frequency curves. The results show that there is a diversity of periodic motions in the process of adjacent super-harmonic resonance transition. Numerical simulations also demonstrate that multi-periodic motions coexist in the system. The motion transition law between the polymorphic coexistence region and its adjacent regions is summarized.","PeriodicalId":56067,"journal":{"name":"Journal of Low Frequency Noise Vibration and Active Control","volume":"7 1","pages":"771 - 788"},"PeriodicalIF":2.3,"publicationDate":"2022-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73279519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of low-frequency vibration in a steam turbine based on closed-loop system identification 基于闭环辨识的汽轮机低频振动分析

IF 2.3 4区工程技术

Journal of Low Frequency Noise Vibration and Active Control Pub Date : 2022-12-24 DOI: 10.1177/14613484221123181

S. Yabui, Hiroki Kotsuchihashi, T. Inoue

{"title":"Analysis of low-frequency vibration in a steam turbine based on closed-loop system identification","authors":"S. Yabui, Hiroki Kotsuchihashi, T. Inoue","doi":"10.1177/14613484221123181","DOIUrl":"https://doi.org/10.1177/14613484221123181","url":null,"abstract":"Steam turbines are used to generate thermal power in electric power plants. They are important industrial equipment that support societal infrastructure. The stable operation of steam turbines is necessary to maintain long-term electrical power supply. However, low-frequency vibration, which is referred to as steam-whirl-induced vibration, is a self-excited vibration that can damage turbines and hinders stable operation. Therefore, a prediction model and stable margin for steam-whirl-induced vibration in steam turbines should be developed. In this study, we propose a method for modeling steam-whirl-induced vibration using closed-loop system identification. This method directly creates a vibration model from the rotor displacement data. The gain, damping, and natural frequency of the vibration were calculated using this model. Moreover, an equation for the relationship between the damping and load was derived using the model, and the stable margin for increasing the load was estimated. Steam-whirl-induced vibration was modeled using the proposed method for the displacement data obtained from an actual steam turbine. The characteristics of the model are in good agreement with the experimental results, indicating the feasibility of using the model to predict steam-whirl-induced vibration.","PeriodicalId":56067,"journal":{"name":"Journal of Low Frequency Noise Vibration and Active Control","volume":"20 1","pages":"525 - 538"},"PeriodicalIF":2.3,"publicationDate":"2022-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82363529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical and experimental study on sound absorption performance of Al2O3-polyurethane foam and microperforated plate composite structure al2o3 -聚氨酯泡沫与微孔板复合结构吸声性能的理论与实验研究

IF 2.3 4区工程技术

Journal of Low Frequency Noise Vibration and Active Control Pub Date : 2022-12-23 DOI: 10.1177/14613484221148047

Yuan Binxia, Hou Weiguang, Liu Jianben, Zhou Bing, Zhu Rui, Cao Lan

引用次数: 1

Combination of modified Lindstedt-Poincare and homotopy perturbation methods 修正Lindstedt-Poincare与同伦摄动方法的组合

IF 2.3 4区工程技术

Journal of Low Frequency Noise Vibration and Active Control Pub Date : 2022-12-23 DOI: 10.1177/14613484221148049

M. Alam, Nazmul Sharif, Md Helal Uddin Molla

引用次数: 3