Pub Date : 2024-06-14DOI: 10.1177/10775463241261550
Junjie Wu, Xiaobin Zhan, Tielin Shi
Resonance can enhance energy conversion and transmission efficiency in mechanical systems. However, maintaining effective resonant behavior by tracking the resonant frequency can be challenging due to load fluctuations. This study introduces a software-based phase-locked loop (SPLL) control method for three-degree-of-freedom acoustic resonant systems (3DOFARS). Initially, the dynamic equation governing the behavior of 3DOFARS is provided, followed by a frequency domain analysis based on the amplitude-phase frequency characteristic curve. Subsequently, the SPLL control method is developed by considering the phase relationship between the system’s excitation signal and response signal, and a control model is then established using Simulink. For the step, slope, and sinusoidal disturbances with specific amplitude and frequency variations, the SPLL control method can track the excitation frequency to the resonant frequency in real time. Among these disturbances, step disturbances pose a greater risk of system instability compared to slope and sinusoidal disturbances. Finally, simulation verification and statistical analysis are carried out by introducing quality interferences of varying types, amplitudes, and frequencies to assess the SPLL control method’s impact on different interferences. Under stable conditions, the SPLL method has better control capabilities against low-frequency interference and better robustness against high-frequency interference. In comparison to conventional methods, the SPLL control method effectively maintains real-time tracking of the excitation frequency to the resonant frequency while upholding process flow integrity.
{"title":"Resonance frequency tracking control of a three-degree-of-freedom acoustic resonance system","authors":"Junjie Wu, Xiaobin Zhan, Tielin Shi","doi":"10.1177/10775463241261550","DOIUrl":"https://doi.org/10.1177/10775463241261550","url":null,"abstract":"Resonance can enhance energy conversion and transmission efficiency in mechanical systems. However, maintaining effective resonant behavior by tracking the resonant frequency can be challenging due to load fluctuations. This study introduces a software-based phase-locked loop (SPLL) control method for three-degree-of-freedom acoustic resonant systems (3DOFARS). Initially, the dynamic equation governing the behavior of 3DOFARS is provided, followed by a frequency domain analysis based on the amplitude-phase frequency characteristic curve. Subsequently, the SPLL control method is developed by considering the phase relationship between the system’s excitation signal and response signal, and a control model is then established using Simulink. For the step, slope, and sinusoidal disturbances with specific amplitude and frequency variations, the SPLL control method can track the excitation frequency to the resonant frequency in real time. Among these disturbances, step disturbances pose a greater risk of system instability compared to slope and sinusoidal disturbances. Finally, simulation verification and statistical analysis are carried out by introducing quality interferences of varying types, amplitudes, and frequencies to assess the SPLL control method’s impact on different interferences. Under stable conditions, the SPLL method has better control capabilities against low-frequency interference and better robustness against high-frequency interference. In comparison to conventional methods, the SPLL control method effectively maintains real-time tracking of the excitation frequency to the resonant frequency while upholding process flow integrity.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141341453","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 : 2024-06-14DOI: 10.1177/10775463241260111
Nan Li, Changqing Bai
Configuration-controllable phononic crystals (CCPCs) have broad application prospects in engineering because of their adjustable vibration-reduction properties. Owing to the complicated constitutive relationship and nonlinear geometric deformation, it is difficult to accurately predict the dynamic characteristics of CCPCs using the finite element method (FEM) or theoretical methods. In this study, we employed a nonlinear autoregressive with exogenous input (NARX) artificial neural network (ANN) to identify the dynamic model of the CCPC under an impact load, using data from over 100 experiments and numerous accumulated samples. The corresponding experimental data for the CCPC were used to train the ANN and determine the rational ANN model. The identification results indicate that appropriate number of neurons and time-delay orders can effectively reduce the identification errors. Compared with the response predicted by the FEM, the identification model can describe the nonlinear characteristics emerging from phononic crystal (PC) experiments more accurately. This study provides an efficient and accurate online identification approach for PC-modeling.
构型可控声子晶体（CCPC）具有可调节的减振特性，在工程领域有着广阔的应用前景。由于复杂的构成关系和非线性几何变形，使用有限元法（FEM）或理论方法很难准确预测 CCPC 的动态特性。在本研究中，我们采用了具有外生输入的非线性自回归（NARX）人工神经网络（ANN）来识别 CCPC 在冲击载荷下的动态模型，使用的数据来自 100 多个实验和大量累积样本。CCPC 的相应实验数据用于训练人工神经网络并确定合理的人工神经网络模型。识别结果表明，适当的神经元数量和时延阶数可以有效降低识别误差。与有限元预测的响应相比，识别模型能更准确地描述声子晶体（PC）实验中出现的非线性特性。这项研究为 PC 建模提供了一种高效、准确的在线识别方法。
{"title":"Dynamic modeling of configuration-controllable phononic crystal using NARX neural networks","authors":"Nan Li, Changqing Bai","doi":"10.1177/10775463241260111","DOIUrl":"https://doi.org/10.1177/10775463241260111","url":null,"abstract":"Configuration-controllable phononic crystals (CCPCs) have broad application prospects in engineering because of their adjustable vibration-reduction properties. Owing to the complicated constitutive relationship and nonlinear geometric deformation, it is difficult to accurately predict the dynamic characteristics of CCPCs using the finite element method (FEM) or theoretical methods. In this study, we employed a nonlinear autoregressive with exogenous input (NARX) artificial neural network (ANN) to identify the dynamic model of the CCPC under an impact load, using data from over 100 experiments and numerous accumulated samples. The corresponding experimental data for the CCPC were used to train the ANN and determine the rational ANN model. The identification results indicate that appropriate number of neurons and time-delay orders can effectively reduce the identification errors. Compared with the response predicted by the FEM, the identification model can describe the nonlinear characteristics emerging from phononic crystal (PC) experiments more accurately. This study provides an efficient and accurate online identification approach for PC-modeling.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"90 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141342328","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}
A laminated permanent magnet array eddy current damper (LPMAECD) is proposed to achieve excellent performance for large-scale precision micro-vibration isolation. It improves the damping coefficient by perpendicular magnetized permanent magnet arrays (PMPMA) and laminar arrangement. The PMPMA forms a magnetic field with unilateral characteristics that increase the air gap magnetic flux density and decrease the magnetic flux density near the yoke, thus achieving a high damping coefficient and a low magnetic leakage. Furthermore, the laminar arrangement increases the damping coefficient further and linearly. The theoretical model of LPMAECD is established and validated, and the effect of its geometrical parameters is analyzed. Experimental results show that the damping ratio of the vibration isolation system is raised from 0.12 to 0.32 by LPMAECD, and the peak transmissibility is attenuated by 66%, with the isolation level improved from VC-D to VC-E. It provides an effective method for solving the weak throttling damping of large-scale precision micro-vibration isolation.
{"title":"Laminated permanent magnet array eddy current damper for large-scale precision micro-vibration isolation","authors":"Yamin Zhao, Junning Cui, Rongxian Cui, Mingrui Jin, Jingdong Zhao","doi":"10.1177/10775463241257573","DOIUrl":"https://doi.org/10.1177/10775463241257573","url":null,"abstract":"A laminated permanent magnet array eddy current damper (LPMAECD) is proposed to achieve excellent performance for large-scale precision micro-vibration isolation. It improves the damping coefficient by perpendicular magnetized permanent magnet arrays (PMPMA) and laminar arrangement. The PMPMA forms a magnetic field with unilateral characteristics that increase the air gap magnetic flux density and decrease the magnetic flux density near the yoke, thus achieving a high damping coefficient and a low magnetic leakage. Furthermore, the laminar arrangement increases the damping coefficient further and linearly. The theoretical model of LPMAECD is established and validated, and the effect of its geometrical parameters is analyzed. Experimental results show that the damping ratio of the vibration isolation system is raised from 0.12 to 0.32 by LPMAECD, and the peak transmissibility is attenuated by 66%, with the isolation level improved from VC-D to VC-E. It provides an effective method for solving the weak throttling damping of large-scale precision micro-vibration isolation.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"56 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141345503","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 : 2024-06-13DOI: 10.1177/10775463241255765
F. Jeniš, Tomáš Michálek, M. Kubík, Aleš Hába, Z. Strecker, Jiří Žáček, I. Mazůrek
It is generally accepted that semi-actively (S/A) controlled dampers can significantly improve the behaviour of a road or rail vehicle. In the case of a railway vehicle, it is possible to increase comfort using S/A control of vertical or lateral secondary dampers. On another way, S/A control offers the possibility of solving a contradiction in the damping requirements for different driving modes, in the case of control of bogie yaw dampers. However, this case has not yet been sufficiently investigated. This paper deals with applying magnetorheological dampers with semi-active control in the locomotive bogie to reduce hunting oscillation. The magnetorheological bogie yaw damper design, new algorithms for its control and application on a complex multi-body locomotive model that simulates fast running on a real straight track are shown. An essential part of the paper focuses on the effect of the damping force level and damper force transient response time. The results have shown that using the semi-active control of the yaw dampers makes it possible to reduce vehicle body lateral oscillation by 60% and improve running stability for higher equivalent conicity and subcritical speed. The critical speed can be increased by more than 250 km/h. The efficiency of the proposed semi-active control increases with increasing damping force level and decreasing transient response time. The control is most effective under conditions of low equivalent conicity.
人们普遍认为，半主动（S/A）控制减震器可以显著改善公路或铁路车辆的性能。就轨道车辆而言，使用 S/A 控制垂直或横向二级阻尼器可以提高舒适性。另一方面，在控制转向架偏航阻尼器的情况下，S/A 控制可解决不同驾驶模式对阻尼要求的矛盾。然而，这种情况尚未得到充分研究。本文论述了在机车转向架中应用具有半主动控制功能的磁流变阻尼器，以减少狩猎振荡。文中展示了磁流变转向架偏航阻尼器的设计、新的控制算法以及在复杂多体机车模型上的应用，该模型模拟了在真实直线轨道上的快速运行。论文的一个重要部分侧重于阻尼力水平和阻尼力瞬态响应时间的影响。结果表明，对偏航阻尼器进行半主动控制可将车体横向振荡减少 60%，并在等效同轴度和次临界速度较高时提高运行稳定性。临界速度可提高 250 km/h 以上。随着阻尼力水平的提高和瞬态响应时间的缩短，所提出的半主动控制的效率也在提高。在低等效同轴度条件下，控制最为有效。
{"title":"Semi-active yaw dampers in locomotive running gear: New control algorithms and verification of their stabilising effect","authors":"F. Jeniš, Tomáš Michálek, M. Kubík, Aleš Hába, Z. Strecker, Jiří Žáček, I. Mazůrek","doi":"10.1177/10775463241255765","DOIUrl":"https://doi.org/10.1177/10775463241255765","url":null,"abstract":"It is generally accepted that semi-actively (S/A) controlled dampers can significantly improve the behaviour of a road or rail vehicle. In the case of a railway vehicle, it is possible to increase comfort using S/A control of vertical or lateral secondary dampers. On another way, S/A control offers the possibility of solving a contradiction in the damping requirements for different driving modes, in the case of control of bogie yaw dampers. However, this case has not yet been sufficiently investigated. This paper deals with applying magnetorheological dampers with semi-active control in the locomotive bogie to reduce hunting oscillation. The magnetorheological bogie yaw damper design, new algorithms for its control and application on a complex multi-body locomotive model that simulates fast running on a real straight track are shown. An essential part of the paper focuses on the effect of the damping force level and damper force transient response time. The results have shown that using the semi-active control of the yaw dampers makes it possible to reduce vehicle body lateral oscillation by 60% and improve running stability for higher equivalent conicity and subcritical speed. The critical speed can be increased by more than 250 km/h. The efficiency of the proposed semi-active control increases with increasing damping force level and decreasing transient response time. The control is most effective under conditions of low equivalent conicity.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"33 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141346220","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 : 2024-06-13DOI: 10.1177/10775463241259296
P. Boscariol, D. Richiedei, A. Trevisani
Motion planning is an effective tool for the suppression of residual oscillation in underactuated mechanical systems, and in particular, model-based method can be used to virtually eliminate any unwanted oscillation after the completion of a motion task. Here, a novel motion planning method, aimed at maximizing robustness to model uncertainties and based on a direct formulation, is proposed and tested. The choice of a direct formulation is aimed at overcoming the numerical problems often encountered when dealing with indirect trajectory planning methods, including the limited robustness to any model-plant mismatch. The proposed direct method is based on three different motion profiles, and is tested for the rest-to-rest motion of a slender beam, with and without parametric robustness constraints, but the same framework can be adapted to countless other situations and formulations. The experimental results showcase good accuracy and a sensible improvement in mitigating the effects of unmodeled perturbations on the system sported by the proposed robustified method over its non-robust counterpart. Experimental results show also the outcome is very similar to the one resulting from a more numerically challenging solution formulated as an indirect problem by means of a two-point boundary value problem.
{"title":"Direct solutions for robust vibration suppression through motion design","authors":"P. Boscariol, D. Richiedei, A. Trevisani","doi":"10.1177/10775463241259296","DOIUrl":"https://doi.org/10.1177/10775463241259296","url":null,"abstract":"Motion planning is an effective tool for the suppression of residual oscillation in underactuated mechanical systems, and in particular, model-based method can be used to virtually eliminate any unwanted oscillation after the completion of a motion task. Here, a novel motion planning method, aimed at maximizing robustness to model uncertainties and based on a direct formulation, is proposed and tested. The choice of a direct formulation is aimed at overcoming the numerical problems often encountered when dealing with indirect trajectory planning methods, including the limited robustness to any model-plant mismatch. The proposed direct method is based on three different motion profiles, and is tested for the rest-to-rest motion of a slender beam, with and without parametric robustness constraints, but the same framework can be adapted to countless other situations and formulations. The experimental results showcase good accuracy and a sensible improvement in mitigating the effects of unmodeled perturbations on the system sported by the proposed robustified method over its non-robust counterpart. Experimental results show also the outcome is very similar to the one resulting from a more numerically challenging solution formulated as an indirect problem by means of a two-point boundary value problem.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"38 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141345846","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 : 2024-06-12DOI: 10.1177/10775463241259568
A. Oliveira, Antônio Almeida Silva, Marcelo Cavalcanti Rodrigues, Estephanie Nobre Dantas Grassi, Carlos José de Araújo, Romulo Pierre Batista do Reis
One of the main applications of shape memory alloy (SMA) concerns vibration control, especially superelastic SMA (SMA-SE), which presents a significant stress hysteresis and can work as a damper while adding minimal weight to the structure. In helicopters, vibration is a phenomenon inherent to their operation, and although cannot be eliminated, must be minimized to acceptable levels of safety and comfort. In this context, this paper aims to present the design, testing, and dynamic behavior of a new device entitled smart pitch link, a device with superelastic material for passive vibration control. The paper depicts the design process, assembly, and device testing using a whirl tower that simulates a helicopter rotor in hover. The approach adopts a comparative analysis of the dynamic response on the prototype in reference condition, with a stiff pitch link, with the modified prototype, and with the superelastic pitch link installation. In addition, beyond hover tests, cyclic commands and an asymmetrical lateral gust were employed to observe the output response of the device under transient loadings. Contrary to the literature data about the low time response of SMA, the device presents satisfactory time response and attenuation in frequencies close to main rotor frequencies, with signal attenuations between 2 to 4 dB without any external energy consumption, which, in a comparative analysis, may exceed more than 50% of vibrational amplitude attenuation.
形状记忆合金（SMA）的主要应用之一涉及振动控制，尤其是超弹性 SMA（SMA-SE），它具有显著的应力滞后性，可作为阻尼器使用，同时对结构的增重最小。在直升机中，振动是其运行中固有的现象，虽然无法消除，但必须将其减小到可接受的安全和舒适水平。在这种情况下，本文旨在介绍一种名为 "智能俯仰连接 "的新装置的设计、测试和动态行为，该装置采用超弹性材料，用于被动振动控制。本文利用一个模拟直升机旋翼悬停的旋翼塔，描述了设计过程、组装和设备测试。该方法对原型机在参考条件下的动态响应进行了比较分析，包括刚性变桨链、改进后的原型机和安装了超弹性变桨链的原型机。此外，除悬停测试外，还采用了循环指令和不对称横向阵风来观察设备在瞬态负载下的输出响应。与有关 SMA 时间响应较低的文献数据相反，该装置在接近主转子频率的频率下呈现出令人满意的时间响应和衰减，信号衰减在 2 到 4 dB 之间，没有任何外部能量消耗，在比较分析中，可能超过振动振幅衰减的 50%。
{"title":"Helicopter vibration control employing superelastic pitch link with shape memory alloy","authors":"A. Oliveira, Antônio Almeida Silva, Marcelo Cavalcanti Rodrigues, Estephanie Nobre Dantas Grassi, Carlos José de Araújo, Romulo Pierre Batista do Reis","doi":"10.1177/10775463241259568","DOIUrl":"https://doi.org/10.1177/10775463241259568","url":null,"abstract":"One of the main applications of shape memory alloy (SMA) concerns vibration control, especially superelastic SMA (SMA-SE), which presents a significant stress hysteresis and can work as a damper while adding minimal weight to the structure. In helicopters, vibration is a phenomenon inherent to their operation, and although cannot be eliminated, must be minimized to acceptable levels of safety and comfort. In this context, this paper aims to present the design, testing, and dynamic behavior of a new device entitled smart pitch link, a device with superelastic material for passive vibration control. The paper depicts the design process, assembly, and device testing using a whirl tower that simulates a helicopter rotor in hover. The approach adopts a comparative analysis of the dynamic response on the prototype in reference condition, with a stiff pitch link, with the modified prototype, and with the superelastic pitch link installation. In addition, beyond hover tests, cyclic commands and an asymmetrical lateral gust were employed to observe the output response of the device under transient loadings. Contrary to the literature data about the low time response of SMA, the device presents satisfactory time response and attenuation in frequencies close to main rotor frequencies, with signal attenuations between 2 to 4 dB without any external energy consumption, which, in a comparative analysis, may exceed more than 50% of vibrational amplitude attenuation.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"92 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141352592","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 : 2024-06-10DOI: 10.1177/10775463241257748
S. F. Haseen, P. Lakshmi
This article addresses the optimization of a Vehicle Active Suspension System (VASS) through the application of a Linear Quadratic Regulator (LQR) controller. The primary objective is to enhance ride comfort and ensure vehicle stability by addressing the divergent needs of vibration control. The research identifies key issues in existing optimization algorithms, namely, the exploration stage inefficiency in Big Bang Big Crunch Optimization (B3C) and the slow convergence rate in Coyote Optimization (CO). To overcome these challenges, a novel hybrid algorithm, Hybrid Coyote optimization based Big Bang Big Crunch (HB3C), is proposed. The research objective is to optimize the LQR weighting matrices using the HB3C algorithm, aiming for improved ride comfort and vehicle safety. The problem statement involves the inadequacies of existing algorithms in addressing the exploration and convergence issues. The motivation lies in enhancing the efficiency of VASS through optimal control, leading to better ride comfort and safety. The methodology involves integrating CO within a loop with B3C to compute the optimum reduction rate for the algorithm. Since, B3C algorithm’s success is highly dependent on selecting the ideal reduction rate. This hybrid approach is then applied to optimize the existing LQR weighting matrices. The results are evaluated in terms of time domain and frequency domain response analysis, with a focus on ride comfort based on ISO 2631-1 standards. The study demonstrates a maximum reduction of approximately 74% achieved by the optimized HB3C-LQR controllers.
{"title":"Active suspension control using novel HB3C optimized LQR controller for vibration suppression and ride comfort enhancement","authors":"S. F. Haseen, P. Lakshmi","doi":"10.1177/10775463241257748","DOIUrl":"https://doi.org/10.1177/10775463241257748","url":null,"abstract":"This article addresses the optimization of a Vehicle Active Suspension System (VASS) through the application of a Linear Quadratic Regulator (LQR) controller. The primary objective is to enhance ride comfort and ensure vehicle stability by addressing the divergent needs of vibration control. The research identifies key issues in existing optimization algorithms, namely, the exploration stage inefficiency in Big Bang Big Crunch Optimization (B3C) and the slow convergence rate in Coyote Optimization (CO). To overcome these challenges, a novel hybrid algorithm, Hybrid Coyote optimization based Big Bang Big Crunch (HB3C), is proposed. The research objective is to optimize the LQR weighting matrices using the HB3C algorithm, aiming for improved ride comfort and vehicle safety. The problem statement involves the inadequacies of existing algorithms in addressing the exploration and convergence issues. The motivation lies in enhancing the efficiency of VASS through optimal control, leading to better ride comfort and safety. The methodology involves integrating CO within a loop with B3C to compute the optimum reduction rate for the algorithm. Since, B3C algorithm’s success is highly dependent on selecting the ideal reduction rate. This hybrid approach is then applied to optimize the existing LQR weighting matrices. The results are evaluated in terms of time domain and frequency domain response analysis, with a focus on ride comfort based on ISO 2631-1 standards. The study demonstrates a maximum reduction of approximately 74% achieved by the optimized HB3C-LQR controllers.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"4 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141363457","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}
In tunnel excavation, blasting is widely adopted as an efficient excavation method. However, the influence of vibration on tunnel surrounding rock and support structures during the blasting process cannot be ignored. In this study, based on the background of tunnel blasting construction, we theoretically analyze the reasonable range for selecting the optimal delay time, considering the wave superposition cancellation effect and rock fragmentation effect. We use field measured single-hole waveform and calculate superimposed predicted waveforms for different delay time through linear superposition. This allows us to determine the optimal delay time; it is then validated through numerical simulation and field experiment. The results indicate that, based on the principles of interference vibration reduction and rock fragmentation, the optimal delay time in theory should be in the range of 6.14–8.06 ms. By performing superposition calculation on the measured single-hole waveforms, we determined that the optimal delay time for continuous detonation of cut-holes is 7 ms. The delay time of 7 ms falls within a reasonable millisecond range and it is consistent with the results of numerical simulation. When the optimal delay time was applied to field blasting, the measured vibration waveforms exhibited uniform distribution. Compared to blasting without delay, the peak vibration velocity of the cut-holes decreased from 2.08 cm/s to 0.20 cm/s, and the dominant frequency band shifted from 20 Hz–60 Hz to 30 Hz–120 Hz. This achieved the desired effects of reducing vibration and enhancing frequency. These findings can serve as a reference for future similar engineering projects.
{"title":"Determination and application study of optimal delay time for tunnel millisecond blasting based on interference vibration reduction method","authors":"Chuanpeng Liu, Yanqi Song, Fuxin Shen, Junjie Zheng, Zhixin Shao, Juntao Yang","doi":"10.1177/10775463241258519","DOIUrl":"https://doi.org/10.1177/10775463241258519","url":null,"abstract":"In tunnel excavation, blasting is widely adopted as an efficient excavation method. However, the influence of vibration on tunnel surrounding rock and support structures during the blasting process cannot be ignored. In this study, based on the background of tunnel blasting construction, we theoretically analyze the reasonable range for selecting the optimal delay time, considering the wave superposition cancellation effect and rock fragmentation effect. We use field measured single-hole waveform and calculate superimposed predicted waveforms for different delay time through linear superposition. This allows us to determine the optimal delay time; it is then validated through numerical simulation and field experiment. The results indicate that, based on the principles of interference vibration reduction and rock fragmentation, the optimal delay time in theory should be in the range of 6.14–8.06 ms. By performing superposition calculation on the measured single-hole waveforms, we determined that the optimal delay time for continuous detonation of cut-holes is 7 ms. The delay time of 7 ms falls within a reasonable millisecond range and it is consistent with the results of numerical simulation. When the optimal delay time was applied to field blasting, the measured vibration waveforms exhibited uniform distribution. Compared to blasting without delay, the peak vibration velocity of the cut-holes decreased from 2.08 cm/s to 0.20 cm/s, and the dominant frequency band shifted from 20 Hz–60 Hz to 30 Hz–120 Hz. This achieved the desired effects of reducing vibration and enhancing frequency. These findings can serve as a reference for future similar engineering projects.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":"101 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141361333","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 : 2024-06-09DOI: 10.1177/10775463241260106
Phuc Tran, Saeid Bashash
This paper aims to develop a high-precision controller for a flexible link manipulator using polynomial reference, feedforward input, and feedback control. The control objective is to move the tip of the flexible link to a target position as quickly as possible without exciting its resonant modes. Upon a frequency response-based system identification, a frequency-domain feedback controller is designed for reference tracking. The controller includes a proportional-integral controller, a lead filter, and a set of notch filters to control the rigid body and the flexible link dynamics. A set of polynomial reference and feedforward input trajectories are then designed to improve the tracking performance and minimize residual vibrations. The conventional polynomial reference is generated based on the rigid body motion of the system. A revised polynomial reference generation method is then developed by adding flexible motions to the conventional reference. Simulations and experimental tests indicate significant improvements in the performance of the control system using the revised polynomial trajectories.
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Pub Date : 2024-06-08DOI: 10.1177/10775463241259619
Sichao Sun, Jie Luo, Ao Huang, Xinyu Xia, Jiale Yang, Hua Zhou
It is significant to predict the remaining useful life (RUL) of the bearing to ensure its safe and stable operation. At present, the data-driven method has been successfully applied in the field of bearing RUL prediction. However, the feature correlations between data at different moments may be different, few methods can dynamically identify the change of the feature correlations between input data at different moments, which can impact the performance of the prediction. This article proposes an innovative RUL prediction method based on the adaptive feature correlations aggregation module (AFCA) and gated recurrent unit (GRU) to address this issue. First, statistical features are extracted from the vibration signal, and the fully connected graph is constructed to map the vibration signal data into the graph structure. Subsequently, the AFCA module is designed and constructed, and the AFCA-GRU model is built by combining GRU. A series of constructed fully connected graphs are fed into the model, and the hidden degradation information in graph structure data is mined to realize the prediction of bearing RUL. Among them, AFCA is used to adaptively explore the spatial correlations between graph node features at different moments, and GRU is used to explore the temporal correlations between graph structures. The PHM2012 Challenge dataset is utilized to validate the effectiveness of the proposed method. The comparative experimental results demonstrate that the performance of the method proposed herein surpasses that of other data-driven methodologies, with the capability to accurately predict the RUL of bearings.
{"title":"Remaining useful life prediction for rolling bearings based on adaptive aggregation of dynamic feature correlations","authors":"Sichao Sun, Jie Luo, Ao Huang, Xinyu Xia, Jiale Yang, Hua Zhou","doi":"10.1177/10775463241259619","DOIUrl":"https://doi.org/10.1177/10775463241259619","url":null,"abstract":"It is significant to predict the remaining useful life (RUL) of the bearing to ensure its safe and stable operation. At present, the data-driven method has been successfully applied in the field of bearing RUL prediction. However, the feature correlations between data at different moments may be different, few methods can dynamically identify the change of the feature correlations between input data at different moments, which can impact the performance of the prediction. This article proposes an innovative RUL prediction method based on the adaptive feature correlations aggregation module (AFCA) and gated recurrent unit (GRU) to address this issue. First, statistical features are extracted from the vibration signal, and the fully connected graph is constructed to map the vibration signal data into the graph structure. Subsequently, the AFCA module is designed and constructed, and the AFCA-GRU model is built by combining GRU. A series of constructed fully connected graphs are fed into the model, and the hidden degradation information in graph structure data is mined to realize the prediction of bearing RUL. Among them, AFCA is used to adaptively explore the spatial correlations between graph node features at different moments, and GRU is used to explore the temporal correlations between graph structures. The PHM2012 Challenge dataset is utilized to validate the effectiveness of the proposed method. The comparative experimental results demonstrate that the performance of the method proposed herein surpasses that of other data-driven methodologies, with the capability to accurately predict the RUL of bearings.","PeriodicalId":508293,"journal":{"name":"Journal of Vibration and Control","volume":" 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141369535","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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