Pub Date : 2024-08-17DOI: 10.1177/10775463241273003
Wei Liu, Xiandong Wang
In this work, the wave approach is combined with nonlocal elasticity theory to address the problems of mechanics of composite nanoscale spherical shells. To the authors’ knowledge, many published literature primarily concentrate on investigating the nonlocal frequencies of nanoscale spherical shells by utilizing conventional method. Currently, no such work has been carried out on the nanoscale spherical shells from wave standpoint, particularly for the laminated nanocomposites. In this work, the characteristic determinant corresponding to composite laminated nanoscale spherical shells is formulated mathematically by incorporating general solution and transfer matrix into the conventional method. Based on wave propagation, the propagation, reflection, and coordination matrices are derived and assembled to capture the nonlocal frequencies. With respect to the composite laminated nanoscale spherical shells, the nonlocal frequencies predicted by wave approach are compared with the conventional solutions to demonstrate the validity of the proposed wave approach. Additionally, the accuracy and validity of the present method for single nanoscale spherical shells are simultaneously confirmed and examined by the available published data. Finally, the illustrative parametric studies are further scrutinized to exhibit the mechanical properties of spherically composite nanostructures.
{"title":"Nonlocal elasticity theory for radial vibration of composite nanoscale spherical shells via wave approach","authors":"Wei Liu, Xiandong Wang","doi":"10.1177/10775463241273003","DOIUrl":"https://doi.org/10.1177/10775463241273003","url":null,"abstract":"In this work, the wave approach is combined with nonlocal elasticity theory to address the problems of mechanics of composite nanoscale spherical shells. To the authors’ knowledge, many published literature primarily concentrate on investigating the nonlocal frequencies of nanoscale spherical shells by utilizing conventional method. Currently, no such work has been carried out on the nanoscale spherical shells from wave standpoint, particularly for the laminated nanocomposites. In this work, the characteristic determinant corresponding to composite laminated nanoscale spherical shells is formulated mathematically by incorporating general solution and transfer matrix into the conventional method. Based on wave propagation, the propagation, reflection, and coordination matrices are derived and assembled to capture the nonlocal frequencies. With respect to the composite laminated nanoscale spherical shells, the nonlocal frequencies predicted by wave approach are compared with the conventional solutions to demonstrate the validity of the proposed wave approach. Additionally, the accuracy and validity of the present method for single nanoscale spherical shells are simultaneously confirmed and examined by the available published data. Finally, the illustrative parametric studies are further scrutinized to exhibit the mechanical properties of spherically composite nanostructures.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":"22 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-16DOI: 10.1177/10775463241273016
Na Lei, Han Ding, Youfu Tang, Peichen Jiang
The traditional Hertz contact model has the problem of mismatch in the scope of application when analyzing reciprocating compressor clearance faults. Therefore, a modified conformal contact force model is proposed in this paper, based on the L–N contact force model, and the modified stiffness coefficient Kc and the modified stiffness index nc are introduced to obtain the modified conformal contact force model. The validity of the modified conformal contact force model was verified by developing simulation model and theory dynamics equations. Based on the simulation model, the effects of different clearance values, different clearance fault locations, and different operating conditions on the dynamic response were investigated. The accuracy of the simulation model was verified by performing fault tests on reciprocating compressors. The simulation results show that, as the number of bearing clearance faults increases, the acceleration of crosshead vibration decreases, and the addition of slide clearance faults increases the acceleration of crosshead vibration; as the friction force and rotational speed increase, the amplitude and frequency of cross head vibration impact under composite clearance faults will be further intensified. For the study of clearance faults in the same type of mechanism, the work done in this paper can be a reference.
{"title":"Dynamic response analysis of composite clearance fault in reciprocating compressor transmission mechanism","authors":"Na Lei, Han Ding, Youfu Tang, Peichen Jiang","doi":"10.1177/10775463241273016","DOIUrl":"https://doi.org/10.1177/10775463241273016","url":null,"abstract":"The traditional Hertz contact model has the problem of mismatch in the scope of application when analyzing reciprocating compressor clearance faults. Therefore, a modified conformal contact force model is proposed in this paper, based on the L–N contact force model, and the modified stiffness coefficient K<jats:sub>c</jats:sub> and the modified stiffness index n<jats:sub>c</jats:sub> are introduced to obtain the modified conformal contact force model. The validity of the modified conformal contact force model was verified by developing simulation model and theory dynamics equations. Based on the simulation model, the effects of different clearance values, different clearance fault locations, and different operating conditions on the dynamic response were investigated. The accuracy of the simulation model was verified by performing fault tests on reciprocating compressors. The simulation results show that, as the number of bearing clearance faults increases, the acceleration of crosshead vibration decreases, and the addition of slide clearance faults increases the acceleration of crosshead vibration; as the friction force and rotational speed increase, the amplitude and frequency of cross head vibration impact under composite clearance faults will be further intensified. For the study of clearance faults in the same type of mechanism, the work done in this paper can be a reference.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":"252 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gearboxes play a vital role in the power transmission of mechanical equipment, and studying fault diagnosis methods is essential to ensure the normal operation of rotating machines. Since the vibration signal of the gearbox has unstable characteristics with strong background noise, a novel approach of fault diagnosis for wind turbine gearbox based on variational mode decomposition (VMD) optimized by sparrow search algorithm (SSA) and improved refined composite multi-scale dispersion entropy (IRCMDE) is proposed in this paper. Firstly, for reducing background noise, sample signals are decomposed by the model of SSA-VMD, and the denoised signals are recomposed according to the correlation coefficient. Then, the proposed IRCMDE under a certain scale factor is calculated to extract initial feature information of the recomposed signal. In the next step, the initial features are reduced to 3 dimensions by the algorithm of the Gaussian process latent variable model (GPLVM). Finally, a support vector machine (SVM) is used to diagnose the different states of gearbox faults. Experimental and comparative experimental results from the wind turbine drivetrain diagnostics simulator (WTDDS) show that the proposed method can quickly and accurately identify the fault of gear transmission.
{"title":"A novel approach of fault diagnosis for gearbox based on VMD optimized by SSA and improved RCMDE","authors":"Jiahao Cao, Xiaodong Zhang, Hongwei Wang, Runsheng Yin","doi":"10.1177/10775463241272983","DOIUrl":"https://doi.org/10.1177/10775463241272983","url":null,"abstract":"Gearboxes play a vital role in the power transmission of mechanical equipment, and studying fault diagnosis methods is essential to ensure the normal operation of rotating machines. Since the vibration signal of the gearbox has unstable characteristics with strong background noise, a novel approach of fault diagnosis for wind turbine gearbox based on variational mode decomposition (VMD) optimized by sparrow search algorithm (SSA) and improved refined composite multi-scale dispersion entropy (IRCMDE) is proposed in this paper. Firstly, for reducing background noise, sample signals are decomposed by the model of SSA-VMD, and the denoised signals are recomposed according to the correlation coefficient. Then, the proposed IRCMDE under a certain scale factor is calculated to extract initial feature information of the recomposed signal. In the next step, the initial features are reduced to 3 dimensions by the algorithm of the Gaussian process latent variable model (GPLVM). Finally, a support vector machine (SVM) is used to diagnose the different states of gearbox faults. Experimental and comparative experimental results from the wind turbine drivetrain diagnostics simulator (WTDDS) show that the proposed method can quickly and accurately identify the fault of gear transmission.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":"83 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-14DOI: 10.1177/10775463241271843
Anpeng Xu, Zhenbang Xu, Hui Zhang, Shuai He, Lintao Wang
The use of space technology and small space loads is increasingly common. To address this, a mechanism for isolation vibration in small optical load has been proposed. The mechanism includes a coarse and fine stage parallel pointing platform (CFPP). This paper investigates an active vibration isolation scheme for the novel pointing stabilization mechanism. The kinetic energy minimization principle is derived from the analysis of its working mechanism and dynamic feedforward characteristics. This principle is confirmed by the feedforward of the indeterminate degrees of freedom of the under-constrained mechanism. A hybrid control scheme of feedback and feedforward is developed based on the H∞ algorithm and the optimal feedforward control algorithm. Simulation and experimentation have proven that the vibration isolation efficiency of more than 20 dB can be achieved in all three axis rotation directions. This meets the precision pointing requirements of small optical load effectively.
空间技术和小型空间负载的使用越来越普遍。为此，我们提出了一种用于隔离小型光学负载振动的机制。该机制包括一个粗级和细级平行指向平台（CFPP）。本文研究了新型指向稳定机制的主动振动隔离方案。通过对其工作机制和动态前馈特性的分析，得出了动能最小化原理。这一原理通过对欠约束机构的不确定自由度的前馈得到了证实。基于 H∞ 算法和最优前馈控制算法，开发了一种反馈和前馈混合控制方案。仿真和实验证明，三轴旋转方向的隔振效率均可达到 20 dB 以上。这有效地满足了小型光学负载的精确指向要求。
{"title":"Design of active vibration isolation controller for pointing stabilization mechanism based on feedforward–feedback hybrid control","authors":"Anpeng Xu, Zhenbang Xu, Hui Zhang, Shuai He, Lintao Wang","doi":"10.1177/10775463241271843","DOIUrl":"https://doi.org/10.1177/10775463241271843","url":null,"abstract":"The use of space technology and small space loads is increasingly common. To address this, a mechanism for isolation vibration in small optical load has been proposed. The mechanism includes a coarse and fine stage parallel pointing platform (CFPP). This paper investigates an active vibration isolation scheme for the novel pointing stabilization mechanism. The kinetic energy minimization principle is derived from the analysis of its working mechanism and dynamic feedforward characteristics. This principle is confirmed by the feedforward of the indeterminate degrees of freedom of the under-constrained mechanism. A hybrid control scheme of feedback and feedforward is developed based on the H<jats:sub>∞</jats:sub> algorithm and the optimal feedforward control algorithm. Simulation and experimentation have proven that the vibration isolation efficiency of more than 20 dB can be achieved in all three axis rotation directions. This meets the precision pointing requirements of small optical load effectively.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":"14 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-14DOI: 10.1177/10775463241273021
Ajaypal Singh, Hans Vreman, Andrew E Dressel, Jason K Moore
This project was designed to understand the causes and mechanisms of bicycle disc brake noise and use that information to formulate and evaluate possible mitigation techniques. Brake noise was generated by a real bicycle running on a treadmill and recorded by microphone and laser vibrometer. Six independent variables, brake force, rotor thickness, front fork stiffness, weather conditions, spoke tension, and friction coefficient, were varied according to a one-quarter fractional factorial design. A finite element model of the rotor, pads, and calliper was also formulated and analysed. The results of these two methods, particularly the disc mode shapes and frequencies, suggest that doublet mode splitting and reconverging plays a role in noise generation and that changing the rotor mass or breaking its symmetry could interfere with such noise generation. Finally, of these mitigations, breaking disc symmetry proved the most fruitful, with noise magnitude reductions from 72% to 99%, depending on frequency.
{"title":"Bicycle disc brake noise analysis and mitigation","authors":"Ajaypal Singh, Hans Vreman, Andrew E Dressel, Jason K Moore","doi":"10.1177/10775463241273021","DOIUrl":"https://doi.org/10.1177/10775463241273021","url":null,"abstract":"This project was designed to understand the causes and mechanisms of bicycle disc brake noise and use that information to formulate and evaluate possible mitigation techniques. Brake noise was generated by a real bicycle running on a treadmill and recorded by microphone and laser vibrometer. Six independent variables, brake force, rotor thickness, front fork stiffness, weather conditions, spoke tension, and friction coefficient, were varied according to a one-quarter fractional factorial design. A finite element model of the rotor, pads, and calliper was also formulated and analysed. The results of these two methods, particularly the disc mode shapes and frequencies, suggest that doublet mode splitting and reconverging plays a role in noise generation and that changing the rotor mass or breaking its symmetry could interfere with such noise generation. Finally, of these mitigations, breaking disc symmetry proved the most fruitful, with noise magnitude reductions from 72% to 99%, depending on frequency.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":"7 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the design of a typical dynamic absorber, the components corresponding to the dynamic vibration absorber (DVA) should be reduced to a lumped constant system model comprising a mass, spring, and damper. The equivalent mass and stiffness must be determined and linked to design coefficients. However, no studies on the dynamic design of a main structure (main system) and an attached DVA (sub-system) based on an FE model without constructing a reduced-order equivalent model with a few DOFs have been conducted. This study proposes a new method of extracting and simplifying the design of a sub-system to function as a DVA using the state of a finite element (FE) model. We established the relationship between the condition of the sub-system functioning as a DVA and the modal parameter of the entire system. According to a survey, the modal kinetic energies, which were calculated from the partial mass matrix and mode vectors, of the main system and sub-system are approximately equal. We used this relationship to redesign the sub-system. As the modal kinetic energy was used as a design index, the FE model could be redesigned without constructing an equivalent lumped parameter model consisting of two or three degrees of freedom (DOFs) as in the conventional DVA design. We demonstrated the relationship between the modal kinetic energies of the main system and sub-system when it functions as a DVA for a 2-DOF lumped mass model and discussed how to distinguish the sub-system from the entire system (multi-DOF system). Considerable improvement was found in re-designing at FE model, validating the proposed method. The proposed method can be used to redesign components that behave similarly to dynamic absorbers to effectively reduce vibration from the results of FE analysis, without modeling the system as a lumped constant system.
在设计典型的动态减震器时，应将与动态减震器（DVA）相对应的部件简化为由质量、弹簧和阻尼器组成的整块恒定系统模型。必须确定等效质量和刚度，并将其与设计系数联系起来。然而，基于有限元模型对主体结构（主系统）和附属 DVA（子系统）进行动态设计，而不构建具有少量 DOF 的降阶等效模型的研究尚未开展。本研究提出了一种新方法，利用有限元 (FE) 模型的状态提取并简化子系统的设计，使其发挥 DVA 的功能。我们确定了作为 DVA 运行的子系统的状态与整个系统的模态参数之间的关系。根据一项调查，主系统和子系统的模态动能（由部分质量矩阵和模态矢量计算得出）大致相等。我们利用这一关系重新设计了子系统。由于模态动能被用作设计指标，因此可以重新设计 FE 模型，而无需像传统 DVA 设计那样构建一个由两个或三个自由度（DOF）组成的等效整块参数模型。我们展示了主系统和子系统的模态动能之间的关系，当主系统作为二维自由度块状质量模型的 DVA 时，并讨论了如何将子系统与整个系统（多维自由度系统）区分开来。在对 FE 模型进行重新设计时，发现了显著的改进，验证了所提出的方法。所提出的方法可用于重新设计与动态吸收器行为相似的部件，以有效减少 FE 分析结果中的振动，而无需将系统建模为一个块状常数系统。
{"title":"Re-designing strategy to enable a sub-system to function as a dynamic vibration absorber","authors":"Masami Matsubara, Kohei Takahashi, Kohei Furuya, Akira Saito, Shozo Kawamura","doi":"10.1177/10775463241272924","DOIUrl":"https://doi.org/10.1177/10775463241272924","url":null,"abstract":"In the design of a typical dynamic absorber, the components corresponding to the dynamic vibration absorber (DVA) should be reduced to a lumped constant system model comprising a mass, spring, and damper. The equivalent mass and stiffness must be determined and linked to design coefficients. However, no studies on the dynamic design of a main structure (main system) and an attached DVA (sub-system) based on an FE model without constructing a reduced-order equivalent model with a few DOFs have been conducted. This study proposes a new method of extracting and simplifying the design of a sub-system to function as a DVA using the state of a finite element (FE) model. We established the relationship between the condition of the sub-system functioning as a DVA and the modal parameter of the entire system. According to a survey, the modal kinetic energies, which were calculated from the partial mass matrix and mode vectors, of the main system and sub-system are approximately equal. We used this relationship to redesign the sub-system. As the modal kinetic energy was used as a design index, the FE model could be redesigned without constructing an equivalent lumped parameter model consisting of two or three degrees of freedom (DOFs) as in the conventional DVA design. We demonstrated the relationship between the modal kinetic energies of the main system and sub-system when it functions as a DVA for a 2-DOF lumped mass model and discussed how to distinguish the sub-system from the entire system (multi-DOF system). Considerable improvement was found in re-designing at FE model, validating the proposed method. The proposed method can be used to redesign components that behave similarly to dynamic absorbers to effectively reduce vibration from the results of FE analysis, without modeling the system as a lumped constant system.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":"47 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-06DOI: 10.1177/10775463241254252
Qiwu Zhao, Xiaoli Zhang
The remaining useful life of rolling element bearing affects the reliability and stability of the machine. Accurately predicting the remaining useful life of rolling element bearings is always necessary to make maintenance decisions in practical engineering. However, the remaining useful life prediction methods using traditional machine learning are incompetent for the task of training without labels, which consumes computational cost, financial resources, and labor. Therefore, a gated recurrent unit model based on feature dimensionality reduction and the multi-head self-attention mechanism (MHGRU) is established, and a homology algorithm is proposed to train the model and make the prediction. The isometric feature mapping algorithm and a homology algorithm are used in the model training, which incorporates the advantages of appreciable computational efficiency and preservation of automatic labeling for training in engineering. First, 24 basic features are extracted from the life-cycle vibration signals of rolling element bearings to reconstruct fusion features by the isometric feature mapping algorithm, which aims to reduce the feature dimension and improve computational efficiency. Since the multi-head self-attention mechanism in the MHGRU has the ability to comprehensively highlight the attention coefficient for long-term fusion features at different moments, it gives the gated recurrent unit considerable performance in reducing the computational complexity of extremely long time series and improving the accuracy of prediction results. In addition, two open-source IEEE PHM Challenge and XJTU-SY bearing datasets sampled by the sensor are adopted to assess the prediction performance of the MHGRU with homology algorithm. Finally, some existing remaining useful life prediction approaches of rolling element bearings are used for comparison. The experimental results show that MHGRU is suitable for the remaining useful life prediction of rolling element bearings and is superior to other models.
{"title":"Prediction of remaining useful life for rolling bearing based on ISOMAP and multi-head self-attention with gated recurrent unit","authors":"Qiwu Zhao, Xiaoli Zhang","doi":"10.1177/10775463241254252","DOIUrl":"https://doi.org/10.1177/10775463241254252","url":null,"abstract":"The remaining useful life of rolling element bearing affects the reliability and stability of the machine. Accurately predicting the remaining useful life of rolling element bearings is always necessary to make maintenance decisions in practical engineering. However, the remaining useful life prediction methods using traditional machine learning are incompetent for the task of training without labels, which consumes computational cost, financial resources, and labor. Therefore, a gated recurrent unit model based on feature dimensionality reduction and the multi-head self-attention mechanism (MHGRU) is established, and a homology algorithm is proposed to train the model and make the prediction. The isometric feature mapping algorithm and a homology algorithm are used in the model training, which incorporates the advantages of appreciable computational efficiency and preservation of automatic labeling for training in engineering. First, 24 basic features are extracted from the life-cycle vibration signals of rolling element bearings to reconstruct fusion features by the isometric feature mapping algorithm, which aims to reduce the feature dimension and improve computational efficiency. Since the multi-head self-attention mechanism in the MHGRU has the ability to comprehensively highlight the attention coefficient for long-term fusion features at different moments, it gives the gated recurrent unit considerable performance in reducing the computational complexity of extremely long time series and improving the accuracy of prediction results. In addition, two open-source IEEE PHM Challenge and XJTU-SY bearing datasets sampled by the sensor are adopted to assess the prediction performance of the MHGRU with homology algorithm. Finally, some existing remaining useful life prediction approaches of rolling element bearings are used for comparison. The experimental results show that MHGRU is suitable for the remaining useful life prediction of rolling element bearings and is superior to other models.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":"40 2 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141934407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-02DOI: 10.1177/10775463241267037
Salwa Yahia, Saida Bedoui, Kamel Abderrahim
This paper introduces a new method for detecting switching instants and designing data-driven FTC for stochastic switched systems susceptible to sensor faults. The approach uses clustering algorithms and classification techniques to establish sub-models based on input-output databases. A data-driven approach is used to estimate the sensor fault, and controllers are generated for each mode to counteract the effects of the fault and minimise noise. The controller gains are determined using a novel LMIs derived from the general Lyapunov function. This approach’s effectiveness is proven through numerical analysis, which features two simulation examples of stochastic switched systems. The first example demonstrates a faulty stochastic switched system with two modes, while the second example depicts a practical application of vehicle rollover prevention systems.
{"title":"Classification-based estimation of commutation instants for sensor fault-tolerant control in switched systems","authors":"Salwa Yahia, Saida Bedoui, Kamel Abderrahim","doi":"10.1177/10775463241267037","DOIUrl":"https://doi.org/10.1177/10775463241267037","url":null,"abstract":"This paper introduces a new method for detecting switching instants and designing data-driven FTC for stochastic switched systems susceptible to sensor faults. The approach uses clustering algorithms and classification techniques to establish sub-models based on input-output databases. A data-driven approach is used to estimate the sensor fault, and controllers are generated for each mode to counteract the effects of the fault and minimise noise. The controller gains are determined using a novel LMIs derived from the general Lyapunov function. This approach’s effectiveness is proven through numerical analysis, which features two simulation examples of stochastic switched systems. The first example demonstrates a faulty stochastic switched system with two modes, while the second example depicts a practical application of vehicle rollover prevention systems.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":"18 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141885058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-30DOI: 10.1177/10775463241267337
Yifan Xuan, Guojun Zhu, Xingqi Luo, Zhenbo Tang, Yang Wang
The rotating speed conversion strategy has a significant impact on the stability of the variable speed operation of the mixed flow pump. Taking a mixed-flow pump as the research object, this paper collects the shaft vibration, pressure pulsation, and external characteristic parameters under different conversion times based on the synchronous acquisition system, and analyzes the influence of conversion time on these parameters. Finally, based on the improved TOPSIS evaluation method, the influence of different conversion time on the stability of the mixed-flow pump is evaluated. The results indicate that the conversion time is positively correlated with the amplitude of shaft vibration and pressure pulsation in the pump during the transition of rotating speed reduction. The local rubbing of the shaft can induce the vibration component corresponding to the high harmonics frequencies such as 2 f n, 3 f n, and 4 f n. The high correlation frequency band of the impeller outlet pressure pulsation and shaft vibration is located between 64 Hz and 120 Hz. And this frequency band is not affected by the conversion time. According to the TOPSIS evaluation results, in the transition process of speed reduction, the longer the rotating speed conversion time, the worse the stability of the mixed-flow pump during the conversion process.
转速转换策略对混流泵变速运行的稳定性有重要影响。本文以混流泵为研究对象，基于同步采集系统采集了不同转换时间下的轴振动、压力脉动和外部特性参数，并分析了转换时间对这些参数的影响。最后，基于改进的 TOPSIS 评价方法，评价了不同转换时间对混流泵稳定性的影响。结果表明，在转速降低的过渡阶段，转换时间与泵的轴振动幅度和压力脉动呈正相关。轴的局部摩擦会引起与 2 f n、3 f n 和 4 f n 等高次谐波频率相对应的振动分量。叶轮出口压力脉动与轴振动的高相关频段位于 64 Hz 至 120 Hz 之间。该频段不受转换时间的影响。根据 TOPSIS 评估结果，在降速过渡过程中，转速转换时间越长，混流泵在转换过程中的稳定性越差。
{"title":"Effect of conversion time on the stability of mixed-flow pump in rotating speed conversion","authors":"Yifan Xuan, Guojun Zhu, Xingqi Luo, Zhenbo Tang, Yang Wang","doi":"10.1177/10775463241267337","DOIUrl":"https://doi.org/10.1177/10775463241267337","url":null,"abstract":"The rotating speed conversion strategy has a significant impact on the stability of the variable speed operation of the mixed flow pump. Taking a mixed-flow pump as the research object, this paper collects the shaft vibration, pressure pulsation, and external characteristic parameters under different conversion times based on the synchronous acquisition system, and analyzes the influence of conversion time on these parameters. Finally, based on the improved TOPSIS evaluation method, the influence of different conversion time on the stability of the mixed-flow pump is evaluated. The results indicate that the conversion time is positively correlated with the amplitude of shaft vibration and pressure pulsation in the pump during the transition of rotating speed reduction. The local rubbing of the shaft can induce the vibration component corresponding to the high harmonics frequencies such as 2 f<jats:sub> n</jats:sub>, 3 f<jats:sub> n</jats:sub>, and 4 f<jats:sub> n</jats:sub>. The high correlation frequency band of the impeller outlet pressure pulsation and shaft vibration is located between 64 Hz and 120 Hz. And this frequency band is not affected by the conversion time. According to the TOPSIS evaluation results, in the transition process of speed reduction, the longer the rotating speed conversion time, the worse the stability of the mixed-flow pump during the conversion process.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":"44 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141864813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-29DOI: 10.1177/10775463241264869
Xingpeng Zhang, Yuru Li, Peng Guo, Meilin Gao
This paper presents theoretical results on the impulsive synchronization of discrete-time fractional-order quaternion-valued neural networks (DFQVNNs) with time delay and parameter uncertainty. First, a useful assumption for parameter uncertainty is put out, predicated on the observation that it is typically brought about by a very tiny disruption. Next, we realize impulsive synchronization for DFQVNNs with the same structure by utilizing the nabla discrete Mittag–Leffler function. We put out a novel synchronization theory for more intricate scenarios in which the architectures of the DFQVNNs are heterogeneous. Finally, the applicability of the theoretical results is demonstrated through numerical examples.
{"title":"Synchronization of heterogeneous discrete-time fractional-order quaternion-valued neural networks with time delay and parameter uncertainty using the impulsive method","authors":"Xingpeng Zhang, Yuru Li, Peng Guo, Meilin Gao","doi":"10.1177/10775463241264869","DOIUrl":"https://doi.org/10.1177/10775463241264869","url":null,"abstract":"This paper presents theoretical results on the impulsive synchronization of discrete-time fractional-order quaternion-valued neural networks (DFQVNNs) with time delay and parameter uncertainty. First, a useful assumption for parameter uncertainty is put out, predicated on the observation that it is typically brought about by a very tiny disruption. Next, we realize impulsive synchronization for DFQVNNs with the same structure by utilizing the nabla discrete Mittag–Leffler function. We put out a novel synchronization theory for more intricate scenarios in which the architectures of the DFQVNNs are heterogeneous. Finally, the applicability of the theoretical results is demonstrated through numerical examples.","PeriodicalId":17511,"journal":{"name":"Journal of Vibration and Control","volume":"474 1","pages":""},"PeriodicalIF":2.8,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141864815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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