The International Journal of Acoustics and Vibration最新文献_第10页

A Method for Predicting the Influences of Bearing Support Stiffness and Position on the Vibrations of a Flexible Rotor System 轴承支承刚度和位置对柔性转子系统振动影响的预测方法

The International Journal of Acoustics and Vibration Pub Date : 2021-12-22 DOI: 10.20855/ijav.2021.26.41798

Jing Liu, Changke Tang

{"title":"A Method for Predicting the Influences of Bearing Support Stiffness and Position on the Vibrations of a Flexible Rotor System","authors":"Jing Liu, Changke Tang","doi":"10.20855/ijav.2021.26.41798","DOIUrl":"https://doi.org/10.20855/ijav.2021.26.41798","url":null,"abstract":"The bearing support stiffness and position can greatly affect the vibrations of flexible rotor systems (FRSs). However, most previous works only focused on the effect of the bearing support stiffness on the critical speeds or modal characteristics including the natural frequencies and mode shapes of rigid rotor systems (RRSs). The previous studies missed the combined effects of the bearing support stiffness and position. To overcome this issue, an analytical method of a FRS based on the finite element (FE) method is proposed. Our model considers the bearing support stiffness and rotational inertia of FRS. The frequency equation of FRS is established for solving the critical speeds. The critical speeds and modal deformations of FRS from our model and the numerical model based on a commercial software are compared to verify the effectiveness of the presented method. The effects of the bearing support stiffness and position on the critical speeds of FRS are analyzed. The results show that the critical speeds are positively correlated with the bearing support stiffness. The critical speeds of FRS are also greatly affected by the bearing position. This study can provide some guidance for the optimization design method of bearing support stiffness and position in FRSs.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121917573","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

Size-Dependent Stability of a Cantilevered Piezoelectrically Actuated Micropipe Conveying Fluid 悬臂式压电驱动微管输送流体的尺寸依赖性稳定性

The International Journal of Acoustics and Vibration Pub Date : 2021-12-22 DOI: 10.20855/ijav.2021.26.41801

Lin Yun-dong, Cheng Feng, Wen Huabin

引用次数: 0

Effect of Tooth Surface Modification on Dynamic Transmission Efficiency of Double Helical Gear Trains 齿面修形对双斜齿轮传动效率的影响

The International Journal of Acoustics and Vibration Pub Date : 2021-12-22 DOI: 10.20855/ijav.2021.26.41793

Feng Wang, Xing Xu, Jiaqi Xia, Hongbo Que

{"title":"Effect of Tooth Surface Modification on Dynamic Transmission Efficiency of Double Helical Gear Trains","authors":"Feng Wang, Xing Xu, Jiaqi Xia, Hongbo Que","doi":"10.20855/ijav.2021.26.41793","DOIUrl":"https://doi.org/10.20855/ijav.2021.26.41793","url":null,"abstract":"To analyse the influence mechanism of vibration loads on dynamic transmission efficiency (DTEF) of double helical gear trains (DHGT), a calculation method of DTEF which takes into consideration the real-time dynamic loads is proposed from the perspective of improving both efficiency and precision. The average DTEF is taken as the dynamic objective function of optimization for three-dimensional modification technology of tooth surface. An engineering example is given in form of numerical simulation, which proves that the average DTEF with the consideration of dynamic loads is obviously lower than the static transmission efficiency (STEF), especially for the resonance speed region. The results also show that the DTEF after 3-D modification is significantly improved, owing to the improvement of meshing state of tooth surface. The comparison of DTEF with different loads and speeds via simulation and experiment furtherly demonstrates the credibility of this theoretical perspectives. This study gives the explanation on the importance of DTEF in determination of driveline parameters and estimation of transmission quality of DHGT. The developed method for DTEF analysis is practical in engineering, and establishes a reliable foundation for further research on design of high-quality double helical gear trains.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128624474","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

Impulse Noise: A Real Threat for Workers and a Challenge for Acousticians 脉冲噪声:对工人的真正威胁和对声学家的挑战

The International Journal of Acoustics and Vibration Pub Date : 2021-12-22 DOI: 10.20855/ijav.2021.26.4e102

J. Arenas

引用次数: 0

Dynamics and Stability of Magnetic-air Hybrid Quasi-zero Stiffness Vibration Isolation System 磁-空气混合准零刚度隔振系统的动力学与稳定性

The International Journal of Acoustics and Vibration Pub Date : 2021-10-19 DOI: 10.21203/rs.3.rs-974601/v1

Youliang Jiang, Chunsheng Song, Xin-Na Ma, Han Wu, Z. Mai

{"title":"Dynamics and Stability of Magnetic-air Hybrid Quasi-zero Stiffness Vibration Isolation System","authors":"Youliang Jiang, Chunsheng Song, Xin-Na Ma, Han Wu, Z. Mai","doi":"10.21203/rs.3.rs-974601/v1","DOIUrl":"https://doi.org/10.21203/rs.3.rs-974601/v1","url":null,"abstract":"\u0000 With the improvement of machining accuracy, external low frequency vibration has become one of the most important factors affecting the performance of equipment. The theory of quasi-zero stiffness vibration isolation shows favorable low frequency vibration isolation effect. Based on our previous research on the structure of magnetic-air hybrid quasi-zero stiffness vibration isolation system, the nonlinear mechanical expression of positive and negative stiffness structure has been analyzed in this paper, to improve application of the system and provide a theoretical basis for sequential studies of active control. To analyze the judgement criterion of the quasi-zero stiffness, an accurate mechanical model was first established. Then, the dynamical model based on external low frequency vibration was developed, to investigate the stability and natural frequency and deduce the amplitude frequency characteristics and displacement transfer rate. Finally, we carried out simulation and experimental analysis to verify the stiffness of high static and low dynamic and the low frequency vibration isolation effect of the vibration isolation system.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133694411","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

Flutter Analysis of Piezoelectric Material Based Smart Wind Turbine Blade 基于压电材料的智能风力机叶片颤振分析

The International Journal of Acoustics and Vibration Pub Date : 2021-09-30 DOI: 10.20855/ijav.2021.26.31787

Hao Wang, Junyu Yi, Wei Chen, Zhexin Zhou

{"title":"Flutter Analysis of Piezoelectric Material Based Smart Wind Turbine Blade","authors":"Hao Wang, Junyu Yi, Wei Chen, Zhexin Zhou","doi":"10.20855/ijav.2021.26.31787","DOIUrl":"https://doi.org/10.20855/ijav.2021.26.31787","url":null,"abstract":"This paper presents a smart wind turbine blade of piezoelectric material. Based on Theodorsen unsteady aerodynamics and the V-g method, the flutter analysis in frequency domain is carried out for the smart wind turbine blade and the ordinary wind turbine blade. The simulation results demonstrate that the flutter critical velocity, that is, the reduced velocity of the smart wind turbine blade, is obviously much higher than that of the ordinary wind turbine blade. The smart wind turbine blade of piezoelectric material can effectively restrain the flutter of the wind turbine blade, especially for the flap motion. For the torsion motion, the smart wind turbine blade is kept away from the critical flutter. Then, to investigate the influences of different parameters on the flutter of the smart wind turbine blade, the influences of the center of gravity, the frequency ratio and the mass ratio of the blades on the flutter critical velocity of the smart wind turbine blade are researched respectively. The increase of the applied external electrical load of the piezoelectric material can increase the flutter critical velocity of the smart wind turbine blade.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126873736","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: 1

Vibration Attenuation Optimization in a Rod With Different Periodic Piezoelectric Shunting Configurations 不同周期压电分流结构杆的减振优化

The International Journal of Acoustics and Vibration Pub Date : 2021-09-30 DOI: 10.20855/ijav.2021.26.31751

Hui Guo, Yaru Zhang, T. Yuan, Peihua Qian, Qian Cheng, Yansong Wang

引用次数: 0

Shôn Ffowcs Williams (1935-2020) - a life devoted to Acoustics Shôn Ffowcs Williams(1935-2020)——一生致力于声学

The International Journal of Acoustics and Vibration Pub Date : 2021-09-30 DOI: 10.20855/ijav.2021.26.3e101

R. E. Musafir

引用次数: 0

Numerical Modal Analyses of Beam-Supported Plates with Varying Thicknesses 变厚度梁支承板的数值模态分析

The International Journal of Acoustics and Vibration Pub Date : 2021-09-30 DOI: 10.20855/ijav.2021.26.31816

A. Yucel

引用次数: 0

A Degradation Condition Assessment Technique Based on online_ISSE Degradation Feature and Logistic Regression Model 基于在线isse退化特征和逻辑回归模型的退化状态评估技术

The International Journal of Acoustics and Vibration Pub Date : 2021-09-30 DOI: 10.20855/ijav.2021.26.31738

Cancan Wang, Bing Wang, Xiong Hu, Wen Wang, Sun Dejian

{"title":"A Degradation Condition Assessment Technique Based on online_ISSE Degradation Feature and Logistic Regression Model","authors":"Cancan Wang, Bing Wang, Xiong Hu, Wen Wang, Sun Dejian","doi":"10.20855/ijav.2021.26.31738","DOIUrl":"https://doi.org/10.20855/ijav.2021.26.31738","url":null,"abstract":"A degradation assessment technique based on an online improved symbol sequence entropy online_ISSE and a logistic regression model is proposed in this paper. Firstly, the threshold factor is introduced to retain the `coarse graining' information of direction changing and amplitude information, the `sensitivity' of improved symbol sequence entropy (SSE) to impact components is reduced and improved symbol sequence entropy (ISSE) is proposed. Then, a sliding window and Weibull distribution theory are used to effectively filter out the influence of fluctuations in the ISSE feature sequence, forming the degradation feature named online_ISSE. Finally, a logistic regression model is trained and constructed, and the health factor CV is calculated online to assess the degradation condition of the unknown signal samples. The lifetime vibration signal of the hoisting gearbox monitored from #8114 quay crane of the Shanghai Port Container Terminal is introduced for instance analysis. The results show that the proposed ISSE has a better effect in describing the complexity pattern than the SSE algorithm and that the degradation condition can be tracked and assessed accurately based on the technique proposed.","PeriodicalId":131358,"journal":{"name":"The International Journal of Acoustics and Vibration","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133950719","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