Journal of Low Frequency Noise, Vibration and Active Control最新文献_第6页

Source identification of a vibrating plate using phase conjugation and interior boundary element method 利用相位共轭和内部边界元法识别振动板的振源

Journal of Low Frequency Noise, Vibration and Active Control Pub Date : 2023-11-25 DOI: 10.1177/14613484231205803

Song Liu, Ren-jie Zhao, Kang Yang, Pan-pan Liu, Yi-fan Du

{"title":"Source identification of a vibrating plate using phase conjugation and interior boundary element method","authors":"Song Liu, Ren-jie Zhao, Kang Yang, Pan-pan Liu, Yi-fan Du","doi":"10.1177/14613484231205803","DOIUrl":"https://doi.org/10.1177/14613484231205803","url":null,"abstract":"Noise pollution is the most serious environmental pollution, which seriously affects people’s normal life and physical and mental health, as well as normal production work. Therefore, noise control is necessary, but before noise control, the first thing to do is to identify the location of the noise source, and the noise control work is meaningless when the noise cannot be identified. Flat plate structures are a fundamental part of complex ship structures, and their vibration, noise, and their interrelationships when excited by the outside world are receiving increasing attention. The core of the research in this paper is the identification of the sound source of the vibrating plate. A method combining phase conjugation with interior boundary element method is developed for the identification of the pressure and normal velocity distribution of a vibrating plate. An interior problem is formed by enclosing the phase conjugation array plane and the plate surface. The pressures at the array elements are phase-conjugated as the specified pressure boundary condition. The impedance relationship between the surface pressure and the surface normal velocity of the plate is utilized as a specified impedance boundary condition. The interior boundary element method is applied to solve the interior problem. The identification of the surface pressure and normal velocity distribution is studied numerically. The numerical results show that with the array located in the near field the proposed method achieves subwavelength focusing to identify the surface pressure and normal velocity distribution and clearly shows the response shapes.","PeriodicalId":504307,"journal":{"name":"Journal of Low Frequency Noise, Vibration and Active Control","volume":"108 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139238366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sound insulation performance and modal analysis of asymmetrical insulating laminated glass 非对称中空夹层玻璃的隔音性能和模态分析

Journal of Low Frequency Noise, Vibration and Active Control Pub Date : 2023-11-21 DOI: 10.1177/14613484231214914

Xi Zhu, Li Juan Wang, Xiao Li Wang, Yi De Zheng, Liang Luo

{"title":"Sound insulation performance and modal analysis of asymmetrical insulating laminated glass","authors":"Xi Zhu, Li Juan Wang, Xiao Li Wang, Yi De Zheng, Liang Luo","doi":"10.1177/14613484231214914","DOIUrl":"https://doi.org/10.1177/14613484231214914","url":null,"abstract":"Windows are commonly the primary way for noise to enter the building environment. Most windows achieve higher sound insulation targets by simply increasing glass thickness or laminate. However, the glass thickness cannot be increased freely due to the window frame’s limitation. This research selects eleven kinds of asymmetric insulating laminated glass (glass + polyvinyl butyral + glass + air + glass) within 27 mm, which are the typical thicknesses of window frames. The three pieces of glass have equal thicknesses. The half-space acoustics method investigated the acoustic properties and modal behavior of the glass with finite thickness. The results show that when PVB or three glass increases simultaneously, and the sound insulation of each glass can be improved by 0.9∼3.4 dB or 3.7∼21.8 dB at first resonant frequencies, respectively. The glass with the best sound insulation is 7 mm glass + 0.76 mm polyvinyl butyral + 7 mm glass + 5 mm air + 7 mm glass (7 + 0.76 + 7 + 5A + 7 for short). Its sound transmission loss (TL) is 38.5 dB from 125 to 4000 Hz and 16.8 dB in the first resonant frequency (200 Hz). In addition, its first resonant frequency is the highest among eleven kinds of glass, and the number of natural frequencies in the low frequency range is only 9. These findings can provide a basis for designing asymmetric insulating laminated glass to improve the low frequency noise reduction effect effectively.","PeriodicalId":504307,"journal":{"name":"Journal of Low Frequency Noise, Vibration and Active Control","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139254275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of vibration of the nano rotating blade coupled with viscous fluid medium by considering the nonlocal elastic theory 通过考虑非局部弹性理论研究与粘性流体介质耦合的纳米旋转叶片的振动

Journal of Low Frequency Noise, Vibration and Active Control Pub Date : 2023-11-21 DOI: 10.1177/14613484231216229

Ali Eskandari, R. Ahmadi Arpanahi, Alireza Daneh-Dezfuli, Bijan Mohammadi, Shahrokh Hosseini Hashemi

引用次数: 0

Dynamic performance analysis of a gear transmission system due to cavitation in gerotor pump 齿轮泵气蚀引起的齿轮传动系统动态性能分析

Journal of Low Frequency Noise, Vibration and Active Control Pub Date : 2023-11-20 DOI: 10.1177/14613484231216232

Zhiwei Wang, Zehua Hu, Zhaoyang Tian, Siyu Chen

{"title":"Dynamic performance analysis of a gear transmission system due to cavitation in gerotor pump","authors":"Zhiwei Wang, Zehua Hu, Zhaoyang Tian, Siyu Chen","doi":"10.1177/14613484231216232","DOIUrl":"https://doi.org/10.1177/14613484231216232","url":null,"abstract":"In this work, a dynamic model considering time-varying mesh stiffness and backlash was proposed and a test rig was built to investigate the vibration behavior of the idle gear set in a gerotor pump. The effects of input shaft speed, torque fluctuation, and gear tooth backlash on the dynamic performance of gerotor pump were analyzed according to the numerical and experimental results. Results demonstrate that when the torque fluctuation is neglected, the dynamic transmission error of drive gear is dominated by the first three mesh harmonic components; however, the RMS values of vibration acceleration have high frequency characteristics. When the torque fluctuation is considered, the dynamic responses of gerotor pump are modulated by the torque fluctuation. The effect of tooth backlash on the dynamic performance of gerotor pump is limited and mostly depended on the torque fluctuation condition. The gerotor pump noise is dominated by the low frequency component around the mesh frequency. The vibration energy can be divided into two parts in the frequency domain. In the low frequency band, the vibration energy is caused by the mechanical vibration. However, in the high frequency band, the cavitation phenomena may cause the concentration of the vibration energy and resonant of pump structure.","PeriodicalId":504307,"journal":{"name":"Journal of Low Frequency Noise, Vibration and Active Control","volume":"187 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139256549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Parameter optimization of electromagnetic suspension-type maglev train control system based on multi-objective grey wolf non-dominated sorting hybrid algorithm-Ⅱ hybrid algorithm 基于多目标灰狼非支配排序混合算法-Ⅱ混合算法的电磁悬浮式磁悬浮列车控制系统参数优化

Journal of Low Frequency Noise, Vibration and Active Control Pub Date : 2023-11-18 DOI: 10.1177/14613484231214915

Meiqi Wang, Siheng Zeng, Pengfei Liu, Yixin He, Enli Chen

{"title":"Parameter optimization of electromagnetic suspension-type maglev train control system based on multi-objective grey wolf non-dominated sorting hybrid algorithm-Ⅱ hybrid algorithm","authors":"Meiqi Wang, Siheng Zeng, Pengfei Liu, Yixin He, Enli Chen","doi":"10.1177/14613484231214915","DOIUrl":"https://doi.org/10.1177/14613484231214915","url":null,"abstract":"This paper presents a novel hybrid algorithm based on CMOGWO-ADNSGA-II to solve the vibration stability problem during the operation of a EMS-type maglev train dynamics model subjected to strong non-linear magnetic buoyancy. The proposed algorithm optimizes the control system parameters of EMS-type maglev train suspensions by combining an improved multi-objective chaotic grey wolf algorithm (CMOGWO) with an improved non-dominated Sorting genetic algorithm-II (ADNSGA-II) to enhance the search capability of the algorithm and ensure population diversity. The efficacy of the algorithm is demonstrated by applying it to the EMS-type maglev train suspension frame control system to find the optimal control parameters. Experimental results show that the system with the optimal parameters applied significantly reduces the suspension gap amplitude and the corresponding standard deviation, as well as the vertical acceleration amplitude and the corresponding standard deviation during operation. The proposed algorithm provides a good solution for EMS-type maglev train suspension vibration control, which can improve its performance and safety.","PeriodicalId":504307,"journal":{"name":"Journal of Low Frequency Noise, Vibration and Active Control","volume":"76 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139262085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An application to formable transform: Novel numerical approach to study the nonlinear oscillator 可形成变换的应用：研究非线性振荡器的新型数值方法

Journal of Low Frequency Noise, Vibration and Active Control Pub Date : 2023-11-16 DOI: 10.1177/14613484231216198

Muhammad Abdul Basit, Madeeha Tahir, Nehad Ali Shah, Sayed M. Tag, Muhammad Imran

{"title":"An application to formable transform: Novel numerical approach to study the nonlinear oscillator","authors":"Muhammad Abdul Basit, Madeeha Tahir, Nehad Ali Shah, Sayed M. Tag, Muhammad Imran","doi":"10.1177/14613484231216198","DOIUrl":"https://doi.org/10.1177/14613484231216198","url":null,"abstract":"Numerical methods in the area of nonlinear systems are extensively implemented for computing their approximate solutions because these systems are very difficult to tackle analytically. There are various numerical techniques available in the literature to find the solutions of nonlinear oscillators. Variational iteration method (VIM) is one of these approaches which is convenient to implement for these kinds of problems. In this work, our study aims to identify the numerical solution of nonlinear oscillator by making use of variational iteration method associated with Formable transformation. For the smooth utilization of this approach, we have to formulate the Lagrange multiplier through variational theory. Furthermore, we develop a new unified iterative scheme for the correction functional of VIM, considering the Formable transformation. Several new schemes of correction functional can be deduced from the newly proposed method considering the duality relation of Formable transform. In support of our primary finding, we discuss numerical example as application. A number of Physical applications of nonlinear oscillators are available in the field of vibrations and oscillations but in recent times nonlinear oscillators are used to describe complicated systems or to address mechanical, electrical, and other engineering phenomenon.","PeriodicalId":504307,"journal":{"name":"Journal of Low Frequency Noise, Vibration and Active Control","volume":"154 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139268044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0