Pub Date : 2024-02-01DOI: 10.1177/10775463241230119
Yuxuan Qin, Fuzhen Pang, Yang Tang, Yaotao Lin, Hang Zhang, Haichao Li
To address the challenge of low-frequency vibration in ships, we introduce a vibration isolation technique and a composite flexible vibration-damping foundation grounded in the principles of impedance equalization and the off-plane attenuation properties of surface waves. We utilize a fluid-structural coupling finite element method and experimental validation to analyze the effect of various properties of the liquid layer of the base. The results indicate that the composite foundation offers superior vibration isolation compared to traditional foundations across a frequency range of 10–500 Hz. Enhancements in the liquid’s viscosity and an increased layer thickness are found to significantly bolster the foundation’s ability to isolate vibrations. The relationship between liquid density and the vibration isolation performance of the base is not entirely positive. An increase in liquid density does provide some improvement to the vibration isolation performance at higher frequencies. Additionally, the presence of multiple liquid sacs within the foundation has a minimal influence on low-frequency isolation but proves to be increasingly beneficial at higher frequencies. Through this study, we aim to provide fresh perspectives and solutions for the attenuation and management of low-frequency vibrations in ships.
{"title":"Vibration isolation characteristics of a novel composite flexible vibration-damping foundation","authors":"Yuxuan Qin, Fuzhen Pang, Yang Tang, Yaotao Lin, Hang Zhang, Haichao Li","doi":"10.1177/10775463241230119","DOIUrl":"https://doi.org/10.1177/10775463241230119","url":null,"abstract":"To address the challenge of low-frequency vibration in ships, we introduce a vibration isolation technique and a composite flexible vibration-damping foundation grounded in the principles of impedance equalization and the off-plane attenuation properties of surface waves. We utilize a fluid-structural coupling finite element method and experimental validation to analyze the effect of various properties of the liquid layer of the base. The results indicate that the composite foundation offers superior vibration isolation compared to traditional foundations across a frequency range of 10–500 Hz. Enhancements in the liquid’s viscosity and an increased layer thickness are found to significantly bolster the foundation’s ability to isolate vibrations. The relationship between liquid density and the vibration isolation performance of the base is not entirely positive. An increase in liquid density does provide some improvement to the vibration isolation performance at higher frequencies. Additionally, the presence of multiple liquid sacs within the foundation has a minimal influence on low-frequency isolation but proves to be increasingly beneficial at higher frequencies. Through this study, we aim to provide fresh perspectives and solutions for the attenuation and management of low-frequency vibrations in ships.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"24 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139685178","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}
Pub Date : 2024-01-17DOI: 10.1177/10775463241228018
Qianqian Wu, Zhihui Liu, Fengyan An, Bilong Liu
A self-tuning PID (Proportion-Integral-Derivative) control method based on the adaptive mechanism was proposed for the magnetic suspension active vibration isolation system with the characteristics of nonlinear, time-varying, and model parameter uncertainty. The controller identified the controlled object parameters online and solved the controller parameters in real time. To test the effectiveness of the proposed method, a six degree-of-freedom (DOF) magnetic suspension active vibration isolation system was designed and built. The six DOF dynamic model of the vibration isolation system with uncertain model parameters was derived for control. Experiments were carried out and compared with the control effects of the tradition PID control and cascade PID control algorithm. The experimental results show that the proposed self-tuning PID controller has more outstanding practicality and effectiveness in solving the model parameter uncertainty problem compared with the existing studies at home and abroad, and it also proves that the control method has a good isolation effect on the wide band disturbances.
{"title":"Self-tuning PID feedback control method for magnetic suspension active vibration isolation system with parameters uncertainty","authors":"Qianqian Wu, Zhihui Liu, Fengyan An, Bilong Liu","doi":"10.1177/10775463241228018","DOIUrl":"https://doi.org/10.1177/10775463241228018","url":null,"abstract":"A self-tuning PID (Proportion-Integral-Derivative) control method based on the adaptive mechanism was proposed for the magnetic suspension active vibration isolation system with the characteristics of nonlinear, time-varying, and model parameter uncertainty. The controller identified the controlled object parameters online and solved the controller parameters in real time. To test the effectiveness of the proposed method, a six degree-of-freedom (DOF) magnetic suspension active vibration isolation system was designed and built. The six DOF dynamic model of the vibration isolation system with uncertain model parameters was derived for control. Experiments were carried out and compared with the control effects of the tradition PID control and cascade PID control algorithm. The experimental results show that the proposed self-tuning PID controller has more outstanding practicality and effectiveness in solving the model parameter uncertainty problem compared with the existing studies at home and abroad, and it also proves that the control method has a good isolation effect on the wide band disturbances.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"51 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139526805","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}
Hydraulic turbine generator sets are crucial for harnessing water energy. However, the nonlinear phenomena resulting from the combination of unbalanced magnetic pull (UMP) and oil film forces remain unclear. A mathematical model of the rotor-bearing system is introduced to investigate the effects of UMP and the nonlinear oil film force on system. The UMP and nonlinear oil film force are derived from the air-gap magnetic energy and short bearing theory, respectively. The proposed model is verified by the stability experiments of hydraulic turbine generator set in the idling, no-load, and load conditions. The results show that, firstly, the system turns unstable for oil whip and oil swirl, and which experiences bifurcation and undergoes dynamical motions such as period-1 to period-5, quasi-periodic, and chaotic motions. Then, at moderate speeds, the rotor eccentricity has the greatest effect on the bifurcation at idle. While the nonlinear characteristics of the system are most sensitive to the rotor eccentricity at loaded condition. Finally, the existence of UMP reduces the instability caused by oil film forces.
{"title":"Nonlinear response of hydraulic turbine generator set caused by unbalanced magnetic pull and oil film force","authors":"Weipeng Sun, Shen Hu, Chenyuan Ma, Daoli Zhao, Wei Ma, Pengcheng Guo","doi":"10.1177/10775463231225787","DOIUrl":"https://doi.org/10.1177/10775463231225787","url":null,"abstract":"Hydraulic turbine generator sets are crucial for harnessing water energy. However, the nonlinear phenomena resulting from the combination of unbalanced magnetic pull (UMP) and oil film forces remain unclear. A mathematical model of the rotor-bearing system is introduced to investigate the effects of UMP and the nonlinear oil film force on system. The UMP and nonlinear oil film force are derived from the air-gap magnetic energy and short bearing theory, respectively. The proposed model is verified by the stability experiments of hydraulic turbine generator set in the idling, no-load, and load conditions. The results show that, firstly, the system turns unstable for oil whip and oil swirl, and which experiences bifurcation and undergoes dynamical motions such as period-1 to period-5, quasi-periodic, and chaotic motions. Then, at moderate speeds, the rotor eccentricity has the greatest effect on the bifurcation at idle. While the nonlinear characteristics of the system are most sensitive to the rotor eccentricity at loaded condition. Finally, the existence of UMP reduces the instability caused by oil film forces.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"31 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139533425","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}
Pub Date : 2024-01-11DOI: 10.1177/10775463241226873
Qin Li, Hui Wang, Gang Shen
A maglev train system is an open loop unstable and strongly nonlinear system. Self-excited coupling vibration between the magnet and the track beam can occur even when the train is stationary. To avoid this, the track beam is generally designed with high stiffness, which directly increases the construction cost of the maglev line. In this research, a new control method for the maglev system with a low stiffness elastic track is proposed based on full state feedback theory and pole assignment theory. In the newly designed controller, track beam DOF is introduced into the control loop with the use of the reduced order state observer (ROSO) to make the control system have the ability to suppress track vibration actively, thus reducing the over dependence of the system stability on track properties. Effectiveness of the proposed control strategy is verified through experiments. Results show that it exhibits a better response compared to the traditional control method, with smaller fluctuations in levitation air gap and magnet acceleration. Furthermore, it can maintain system stability with relatively lower track stiffness, reducing the minimum requirements for track stiffness by 53.4% in the test.
{"title":"Control of the maglev system with a low stiffness elastic track beam by pole assignment and a reduced order state observer","authors":"Qin Li, Hui Wang, Gang Shen","doi":"10.1177/10775463241226873","DOIUrl":"https://doi.org/10.1177/10775463241226873","url":null,"abstract":"A maglev train system is an open loop unstable and strongly nonlinear system. Self-excited coupling vibration between the magnet and the track beam can occur even when the train is stationary. To avoid this, the track beam is generally designed with high stiffness, which directly increases the construction cost of the maglev line. In this research, a new control method for the maglev system with a low stiffness elastic track is proposed based on full state feedback theory and pole assignment theory. In the newly designed controller, track beam DOF is introduced into the control loop with the use of the reduced order state observer (ROSO) to make the control system have the ability to suppress track vibration actively, thus reducing the over dependence of the system stability on track properties. Effectiveness of the proposed control strategy is verified through experiments. Results show that it exhibits a better response compared to the traditional control method, with smaller fluctuations in levitation air gap and magnet acceleration. Furthermore, it can maintain system stability with relatively lower track stiffness, reducing the minimum requirements for track stiffness by 53.4% in the test.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"8 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139438970","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}
Pub Date : 2024-01-10DOI: 10.1177/10775463231220422
Nirbhow Jap Singh, Vikram Chopra, Sandeep Pandey
This paper proposes a novel artificial bee colony with predation effect (ABCPE) algorithm for tuning a proportional integral derivative (PID) controller. The mathematical model of ABCPE algorithm to introduce predator effect in the foraging behavior of artificial bees colony algorithm has been formulated. The proposed algorithm has been tested on tuning problems of different process models. The simulation results reveal that the closed-loop responses are relatively fast and non-oscillatory as compared to the frequency response analysis method for reference tracking. Further, the results obtained using ABCPE are also compared with other evolutionary algorithms. The exhaustive analysis shows that the ABCPE-based solution approach leads to a set of tuning parameters having smaller overshoot, less setting time, and rise time compared to other solution approaches. The stability analysis using Nichols plot reveals that the phase margin of proposed algorithm is higher as compared to other tuning methods. Finally, the convergence behavior and robustness analysis reveals the effectiveness of the proposed approach to solve engineering design problems.
{"title":"Artificial bee colony with predator effect algorithm for proportional integral derivative controller tuning","authors":"Nirbhow Jap Singh, Vikram Chopra, Sandeep Pandey","doi":"10.1177/10775463231220422","DOIUrl":"https://doi.org/10.1177/10775463231220422","url":null,"abstract":"This paper proposes a novel artificial bee colony with predation effect (ABCPE) algorithm for tuning a proportional integral derivative (PID) controller. The mathematical model of ABCPE algorithm to introduce predator effect in the foraging behavior of artificial bees colony algorithm has been formulated. The proposed algorithm has been tested on tuning problems of different process models. The simulation results reveal that the closed-loop responses are relatively fast and non-oscillatory as compared to the frequency response analysis method for reference tracking. Further, the results obtained using ABCPE are also compared with other evolutionary algorithms. The exhaustive analysis shows that the ABCPE-based solution approach leads to a set of tuning parameters having smaller overshoot, less setting time, and rise time compared to other solution approaches. The stability analysis using Nichols plot reveals that the phase margin of proposed algorithm is higher as compared to other tuning methods. Finally, the convergence behavior and robustness analysis reveals the effectiveness of the proposed approach to solve engineering design problems.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"3 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139439921","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}
The active–passive hybrid vibration isolation technology emerges with the advancement of the requirements for ship vibration and noise reduction. Among these, the magnetic suspension damper based on magnetic suspension technology has received more attention. In this paper, the effects of magnetic pole area and control current on the magnetic flux density and suspension force are verified by establishing a magnetic suspension structure model and comparing and verifying the results carried out by combining the theoretical formulas and finite element simulation. By exploring the effect of the structure on the magnetic flux density and suspension force, a new H-type asymmetric magnetic suspension structure is proposed and simulated. The results show that the H-type asymmetric magnetic suspension structure is more successful at improving the suspension force while also widening the suspension force response interval and improving the performance of the magnetic suspension damper. In addition to offering a new design concept for the construction of ship vibration and noise reduction structures, this structural solution serves as a reference for the development of magnetic suspension dampers.
随着对船舶减振降噪要求的提高，主被动混合隔振技术应运而生。其中，基于磁悬浮技术的磁悬浮减振器受到了更多关注。本文通过建立磁悬架结构模型，并结合理论公式和有限元仿真结果进行对比和验证，验证了磁极面积和控制电流对磁通密度和悬架力的影响。通过探讨结构对磁通密度和悬浮力的影响，提出了一种新型 H 型非对称磁悬浮结构，并对其进行了仿真。结果表明，H 型非对称磁悬架结构更成功地改善了悬架力，同时还拓宽了悬架力响应区间，提高了磁悬架减振器的性能。该结构方案不仅为船舶减振降噪结构的建造提供了新的设计理念，还为磁悬浮减振器的开发提供了参考。
{"title":"Design and optimization of H-type asymmetric magnetic suspension vibration absorber for ships","authors":"Bo Zhou, Changming Dai, Zhengyuan Liu, Jiawei Yu, Hui-liang Liu, Binbin Zhang","doi":"10.1177/10775463241226840","DOIUrl":"https://doi.org/10.1177/10775463241226840","url":null,"abstract":"The active–passive hybrid vibration isolation technology emerges with the advancement of the requirements for ship vibration and noise reduction. Among these, the magnetic suspension damper based on magnetic suspension technology has received more attention. In this paper, the effects of magnetic pole area and control current on the magnetic flux density and suspension force are verified by establishing a magnetic suspension structure model and comparing and verifying the results carried out by combining the theoretical formulas and finite element simulation. By exploring the effect of the structure on the magnetic flux density and suspension force, a new H-type asymmetric magnetic suspension structure is proposed and simulated. The results show that the H-type asymmetric magnetic suspension structure is more successful at improving the suspension force while also widening the suspension force response interval and improving the performance of the magnetic suspension damper. In addition to offering a new design concept for the construction of ship vibration and noise reduction structures, this structural solution serves as a reference for the development of magnetic suspension dampers.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"6 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139439655","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}
Pub Date : 2024-01-09DOI: 10.1177/10775463231223773
Zhufeng Liu, Peiyu Wang, Guojia Li, Yonghui Xie, Di Zhang
The mistuning phenomenon is commonly seen in the bladed assemblies of turbomachinery, leading to an unreasonably localized energy distribution that may increase the risk of high cycle fatigue and potentially cause blade failure. The friction coupling interaction is often introduced to attenuate the effect of excessive amplification on the structural vibration. To investigate the vibration localization of damped and mistuned bladed-disk system, a typical mistuning characterization is applied to an improved four-degree-of-freedom lumped parameter model to explicit the vibratory properties with coupled frictional contact. The statistical findings of natural frequency and modal localization factor are obtained by employing the Monte Carlo simulation to explore the influence of mistuned variance and coupled stiffness on the modal localization of free and damped bladed-disk system, respectively. The forced response sensitivity featured in the mistuned variance is quantitatively analyzed from the perspective of vibration localization and energy distribution by the nonlinear solution method. The influence of excitation order and normal load are further, respectively, discussed on the response localization level of the mistuned system. The results can provide fundamental knowledge of the impact of the mistuning pattern on vibration localization for the early design of the aeroengine.
{"title":"Investigation on the vibration localization of mistuned bladed disk with frictional contact","authors":"Zhufeng Liu, Peiyu Wang, Guojia Li, Yonghui Xie, Di Zhang","doi":"10.1177/10775463231223773","DOIUrl":"https://doi.org/10.1177/10775463231223773","url":null,"abstract":"The mistuning phenomenon is commonly seen in the bladed assemblies of turbomachinery, leading to an unreasonably localized energy distribution that may increase the risk of high cycle fatigue and potentially cause blade failure. The friction coupling interaction is often introduced to attenuate the effect of excessive amplification on the structural vibration. To investigate the vibration localization of damped and mistuned bladed-disk system, a typical mistuning characterization is applied to an improved four-degree-of-freedom lumped parameter model to explicit the vibratory properties with coupled frictional contact. The statistical findings of natural frequency and modal localization factor are obtained by employing the Monte Carlo simulation to explore the influence of mistuned variance and coupled stiffness on the modal localization of free and damped bladed-disk system, respectively. The forced response sensitivity featured in the mistuned variance is quantitatively analyzed from the perspective of vibration localization and energy distribution by the nonlinear solution method. The influence of excitation order and normal load are further, respectively, discussed on the response localization level of the mistuned system. The results can provide fundamental knowledge of the impact of the mistuning pattern on vibration localization for the early design of the aeroengine.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"16 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139443140","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}
Pub Date : 2024-01-09DOI: 10.1177/10775463231226263
He Dai, Yinbo Wang, Shunan Luo, Bin Zi
To address the vibration and modulation sideband mechanism problems, this paper proposes a dynamic model for the planetary gear transmission (PGT). Based on the time-varying vibration transfer path analysis, a novel analytical vibration signal model is derived using the mode superposition method to study the vibration characteristics of the ring gear. In the presented signal model, we analyze the complicated modulation sidebands in terms of frequency and reveal the amplitude modulation effect of the carrier. Results show that amplitudes of modulation sidebands are slightly asymmetric for a single planet system, while the amplitudes of modulation sidebands are asymmetric for the multiple planets system. Furthermore, methods for suppressing the vibration are proposed by designing the appropriate planet position angles, meshing phasing, and load sharing performance. Finally, simulation and experimental signals are compared to verify the proposed model. The result shows that experimental signals keep good consistency with the simulated signals.
{"title":"Vibration sideband modulation mechanism and analytical signal modelling of the ring gear in a planetary gear set","authors":"He Dai, Yinbo Wang, Shunan Luo, Bin Zi","doi":"10.1177/10775463231226263","DOIUrl":"https://doi.org/10.1177/10775463231226263","url":null,"abstract":"To address the vibration and modulation sideband mechanism problems, this paper proposes a dynamic model for the planetary gear transmission (PGT). Based on the time-varying vibration transfer path analysis, a novel analytical vibration signal model is derived using the mode superposition method to study the vibration characteristics of the ring gear. In the presented signal model, we analyze the complicated modulation sidebands in terms of frequency and reveal the amplitude modulation effect of the carrier. Results show that amplitudes of modulation sidebands are slightly asymmetric for a single planet system, while the amplitudes of modulation sidebands are asymmetric for the multiple planets system. Furthermore, methods for suppressing the vibration are proposed by designing the appropriate planet position angles, meshing phasing, and load sharing performance. Finally, simulation and experimental signals are compared to verify the proposed model. The result shows that experimental signals keep good consistency with the simulated signals.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"54 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139441953","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}
Pub Date : 2024-01-08DOI: 10.1177/10775463241226868
Haonan He, Ran Bi, Shihao Zhao, Ming Wang, Xiaozhen Li
When railways traverse densely populated industrial areas, the periodic operation of large-scale factory equipment can produce consistent and regular environmental excitation on bridge structures. This excitation, if resonant with the structure, may cause significant vibration of the bridge, posing a threat to trains’ running safety. For the first time, this paper tackles this practical concern by combining field measurements with an analysis of how environment-induced bridge vibrations impact the operational performance of high-speed trains. The environmental vibration was equivalently incorporated into the analysis of the train-bridge coupled vibration system, examining the effects of structural vibration amplitude, frequency, and environmental influence range. The effect of bridge vibration on the driving performance of high-speed trains was evaluated from the spatial frequency domain properties of dynamic irregularity of track and the trains’ performance sensitivity to different parameters. The field measurements reveal that the environment-induced bridge vibration results in a translational motion of the beam driven by the transverse bending of the pier, resonating at approximately 1.5 Hz with an amplitude of 1.33 mm. The CRH series train, characterized by a prominent lateral mode close to 1.5 Hz (i.e., the wavelength sensitive to the train’s lateral running stability predominantly falls within the 30 m–100 m range at speed of 200∼350 km/h), exhibits a high susceptibility to vibrations induced by the environment in bridges. Among the examined parameters, the amplitude of bridge vibration has the most pronounced impact on the train’s acceleration, showing a linear correlation. The combined effect of bridge vibration and track static irregularity resulted in the lateral acceleration of the car body reaching 0.9 m/s2, which is close to the regulatory limit of 1.0 m/s2. Through parameter analysis, the maximum amplitude of the bridge that can be sustained while ensuring driving stability can be determined.
{"title":"Influence of environment-induced bridge vibration on high-speed train’s driving performance","authors":"Haonan He, Ran Bi, Shihao Zhao, Ming Wang, Xiaozhen Li","doi":"10.1177/10775463241226868","DOIUrl":"https://doi.org/10.1177/10775463241226868","url":null,"abstract":"When railways traverse densely populated industrial areas, the periodic operation of large-scale factory equipment can produce consistent and regular environmental excitation on bridge structures. This excitation, if resonant with the structure, may cause significant vibration of the bridge, posing a threat to trains’ running safety. For the first time, this paper tackles this practical concern by combining field measurements with an analysis of how environment-induced bridge vibrations impact the operational performance of high-speed trains. The environmental vibration was equivalently incorporated into the analysis of the train-bridge coupled vibration system, examining the effects of structural vibration amplitude, frequency, and environmental influence range. The effect of bridge vibration on the driving performance of high-speed trains was evaluated from the spatial frequency domain properties of dynamic irregularity of track and the trains’ performance sensitivity to different parameters. The field measurements reveal that the environment-induced bridge vibration results in a translational motion of the beam driven by the transverse bending of the pier, resonating at approximately 1.5 Hz with an amplitude of 1.33 mm. The CRH series train, characterized by a prominent lateral mode close to 1.5 Hz (i.e., the wavelength sensitive to the train’s lateral running stability predominantly falls within the 30 m–100 m range at speed of 200∼350 km/h), exhibits a high susceptibility to vibrations induced by the environment in bridges. Among the examined parameters, the amplitude of bridge vibration has the most pronounced impact on the train’s acceleration, showing a linear correlation. The combined effect of bridge vibration and track static irregularity resulted in the lateral acceleration of the car body reaching 0.9 m/s2, which is close to the regulatory limit of 1.0 m/s2. Through parameter analysis, the maximum amplitude of the bridge that can be sustained while ensuring driving stability can be determined.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"23 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139445482","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}
Pub Date : 2024-01-08DOI: 10.1177/10775463231226345
Jinlong Hu, Zhe Xie, Yang Liu, Guoli Zhu
In the process of full-face tunnel boring machine (TBM) tunneling, pitch angle measurement accuracy of the laser target is greatly reduced by low frequency vibrations with large amplitude and multiple degrees of freedom. In order to improve pitch angle measurement accuracy of laser target under vibration, a three-degree-of-freedom (3-DOF) active vibration isolation system is designed in this paper. A plate-type voice coil motor with large air gap and large thrust is designed based on genetic algorithm. In order to increase damping of the vibration isolation system, an eddy current damper is designed by combining copper plate and permanent magnet of the voice coil motor. An active vibration isolation device for laser target was built by using the designed plate-type voice coil motor and eddy current damper, and the dynamic model of the system was established. Aiming at control and stability problems caused by the nonlinear factors, a High-Frequency sliding mode controller which can ensure system asymptotically stable is designed in this paper. A 1–30 Hz sinusoidal sweep excitation experiment was performed on a shaking table. The experimental results show that the active vibration isolation system has a good damping effect. The root mean square (RMS) of acceleration in Y direction can be attenuated by 90.5%, in Z direction can be attenuated by 95.8%. The active isolation system effectively attenuates the vibration transmitted to the laser target, and pitch angular fluctuation of the laser target is reduced by 75.8%. The designed active vibration isolation system improves the pitch angle measurement accuracy of the laser target.
{"title":"A novel 3-DOF active vibration isolation method for TBM’s laser target","authors":"Jinlong Hu, Zhe Xie, Yang Liu, Guoli Zhu","doi":"10.1177/10775463231226345","DOIUrl":"https://doi.org/10.1177/10775463231226345","url":null,"abstract":"In the process of full-face tunnel boring machine (TBM) tunneling, pitch angle measurement accuracy of the laser target is greatly reduced by low frequency vibrations with large amplitude and multiple degrees of freedom. In order to improve pitch angle measurement accuracy of laser target under vibration, a three-degree-of-freedom (3-DOF) active vibration isolation system is designed in this paper. A plate-type voice coil motor with large air gap and large thrust is designed based on genetic algorithm. In order to increase damping of the vibration isolation system, an eddy current damper is designed by combining copper plate and permanent magnet of the voice coil motor. An active vibration isolation device for laser target was built by using the designed plate-type voice coil motor and eddy current damper, and the dynamic model of the system was established. Aiming at control and stability problems caused by the nonlinear factors, a High-Frequency sliding mode controller which can ensure system asymptotically stable is designed in this paper. A 1–30 Hz sinusoidal sweep excitation experiment was performed on a shaking table. The experimental results show that the active vibration isolation system has a good damping effect. The root mean square (RMS) of acceleration in Y direction can be attenuated by 90.5%, in Z direction can be attenuated by 95.8%. The active isolation system effectively attenuates the vibration transmitted to the laser target, and pitch angular fluctuation of the laser target is reduced by 75.8%. The designed active vibration isolation system improves the pitch angle measurement accuracy of the laser target.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"60 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139446660","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}
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