Mechanical Systems and Signal Processing最新文献

{"title":"A probability-preservation-based subdomain inverse mapping strategy for direct probability identification of random parameters in complex engineering systems","authors":"Xin Huang ,&nbsp;Meng-Ze Lyu ,&nbsp;Jian-Bing Chen ,&nbsp;Jie Li","doi":"10.1016/j.ymssp.2025.112651","DOIUrl":"10.1016/j.ymssp.2025.112651","url":null,"abstract":"<div><div>The response analysis of high-dimensional, nonlinear engineering systems under various excitations is inevitably associated with significant randomness and uncertainty. To assess engineering reliability accurately, a detailed stochastic model for the system must be developed first. However, some system parameters, such as those in modeling the nonlinear restoring force, cannot be directly measured and must instead be indirectly obtained through experiments. For engineering systems characterized by large-scale identical units or identical component units, it is feasible to acquire statistical system outputs, which consequently enables the probability identification of random parameters. Previous studies on the parameter identification of stochastic systems typically focused on identifying deterministic statistical quantities of the assumed certain probability-distribution forms. However, it is indeed difficult for these assumed distribution forms to accurately capture the true probability distribution to be identified. In this paper, the inverse probability problem is analyzed from the perspective of the principle of preservation of probability, and a probability-preservation-based subdomain inverse mapping (PPIM) strategy for direct probability identification is proposed. This strategy enables direct probability identification for random parameters, avoiding the assumption of certain probability-distribution forms. Under the PPIM strategy, a composite vector decomposition-combination (CDC) method is further developed to address the cases involving non-injective mappings. By assembling the composite vector and implementing the decomposition-combination iterations, the probability distribution of random parameters can be efficiently identified. Additionally, the incremental point-selection strategy, along with a global incremental point-selection (GIP) method and a local incremental point-augmentation (LIP) method, is developed in the numerical implement to realize the efficient reuse of sample data and significantly reduce the computational costs. Finally, several numerical examples are studied to demonstrate the efficiency of the proposed method in the probability identification of random parameters for engineering systems.</div></div>","PeriodicalId":51124,"journal":{"name":"Mechanical Systems and Signal Processing","volume":"232 ","pages":"Article 112651"},"PeriodicalIF":7.9,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing bandwidth of triboelectric vibration energy harvesters through magnetic tuning","authors":"Chaoyang Zhao ,&nbsp;Xin Li ,&nbsp;Liwei Dong ,&nbsp;Guobiao Hu ,&nbsp;Chengjia Han ,&nbsp;Yiqing Dong ,&nbsp;Liya Zhao ,&nbsp;Yaowen Yang","doi":"10.1016/j.ymssp.2025.112704","DOIUrl":"10.1016/j.ymssp.2025.112704","url":null,"abstract":"<div><div>This paper presents a novel design approach for ultra-wideband triboelectric vibration energy harvesters (UWBTVEH) by utilizing magnetic interactions to enhance performance. The triboelectric transducer operates through the coupled effect of two triboelectric layers, with nonlinear hardening and softening behaviors precisely controlled using both attractive and repulsive magnetic forces. This mechanism enables easy adjustment of beam resonances, resulting in a significantly broadened bandwidth. The approach is validated with a cost-effective UWBTVEH prototype comprising two cantilever beams, middle plates, magnet pairs and triboelectric transducers operating in a contact-separation mode. Nonlinear magnetic forces acting on the beams further influence the dynamic behavior of the triboelectric layers. Theoretical and experimental analyses demonstrate that the harvester, equipped with top and bottom magnet pairs at a 14 mm gap distance, achieves a bandwidth of 11.7 Hz under a base acceleration of 0.6 g. This performance marks a 72 % increase in the bandwidth compared to conventional triboelectric energy harvesters without magnet tuning under the same conditions. An electro-mechanical model was established and validated through experiments, demonstrating that the model effectively captures the key features of the harvester, including its wideband behavior, voltage output magnitude and asymmetric voltage signal. Furthermore, the energy generation capability of the UWBTVEH was demonstrated by powering an IoT sensing module, enabling wireless signal transmission. In summary, the proposed methodology offers valuable guidance for designing UWBTVEHs, making it particularly significant in applications involving variable-frequency energy sources.</div></div>","PeriodicalId":51124,"journal":{"name":"Mechanical Systems and Signal Processing","volume":"232 ","pages":"Article 112704"},"PeriodicalIF":7.9,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cavitation intensity recognition for axial piston pump based on transient flow rate measurement and improved transfer learning method","authors":"Renyuan Wang ,&nbsp;Yuanzhi Xu ,&nbsp;Wenkan Mu ,&nbsp;Yucan Chen ,&nbsp;Zongxia Jiao","doi":"10.1016/j.ymssp.2025.112667","DOIUrl":"10.1016/j.ymssp.2025.112667","url":null,"abstract":"<div><div>Cavitation phenomenon occurred in the axial piston pump will lead to damages inside the pump as well as vibration and noise in the pipeline system, which makes the cavitation monitoring become a much concerned topic. Compared with the pressure pulsation, the flow ripple of the pump could reflect the cavitation intensity more directly, because the flow ripple is independent on the pipeline and the load valve. This paper proposes a temporal-spatial method of characteristics (TSMOC) to calculate the exact flow rate at the pump discharge, using two measured pressures along the pipeline. The basic idea is treating two pressures as the boundaries, achieving time-marching scheme of flow ripples within the boundaries and space-marching scheme towards the pump discharge port. The TSMOC is verified numerically compared with results of computational fluid dynamic (CFD) simulation. As such the pump’s flow rate is obtained based on measured pressures, and a flow dataset can be created for training the artificial neural networks. For pumps operate under various working conditions, a transfer learning method is introduced due to its strong domain adaption ability, to recognize new tasks with minimal additional training. However, the present transfer learning methods may not achieve high accurate performance because their feature extractors do not suit cavitation features. To improve the recognition accuracy, a novel method with dual path attention mechanism (DPAM) combined with the architecture of correlation alignment (CORAL) method, called DPAM-CORAL, is proposed. To validate the effectiveness of the flow dataset and the learning method, the test rig for the pump cavitation is established and experiments are carried out. The results indicate that the proposed DPAM-CORAL based on the flow dataset could achieve an average recognition accuracy of 98.0%, which is the highest among all the learning methods. It is also demonstrated that the cavitation recognition based on the flow dataset is more accurate than that based on the pressure dataset. The proposed TSMOC method and improved transfer learning method in this work are proven to be effective and accurate.</div></div>","PeriodicalId":51124,"journal":{"name":"Mechanical Systems and Signal Processing","volume":"232 ","pages":"Article 112667"},"PeriodicalIF":7.9,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A fully coupled model for tribo-dynamic performance analysis of gas foil bearing-rotor system during start-up","authors":"Xuewei Zhao ,&nbsp;Changlin Li ,&nbsp;Jie Li ,&nbsp;Jianjun Du ,&nbsp;Yong Lu","doi":"10.1016/j.ymssp.2025.112699","DOIUrl":"10.1016/j.ymssp.2025.112699","url":null,"abstract":"<div><div>The wear taking place on the top foil surface due to asperity contact with the rotor during start-up is a significant contributor to the failure of gas foil bearings. Hence, research on the start-up behaviors of foil bearings is crucial for improving structural design and extending service life. This paper presents a transient model to investigate the tribo-dynamic performance of foil bearing-rotor system during start-up, which comprehensively considers transient hydrodynamic pressure, deflection of the foil structure, dynamic motion of the rotor and multi-domain coupling effect. The Reynolds equation is formulated with consideration of the gas rarefaction and surface roughness effects. Both the top foil and bump foil are modeled using the beam elements, between which the close/loose contacts are considered. To alleviate time-lack issue and improve convergence, this model is numerically solved in a fully coupled manner. A test rig is established for validation. The simulations reveal that the hydrodynamic and asperity contact forces show obvious fluctuations in the initial period of start-up. Subambient pressure occurs within the gas film, causing the separations between the top foil and bumps. Besides, the effects of nominal clearance, acceleration time and surface roughness on the tribo-dynamic performance of foil bearing-rotor system during start-up are evaluated.</div></div>","PeriodicalId":51124,"journal":{"name":"Mechanical Systems and Signal Processing","volume":"232 ","pages":"Article 112699"},"PeriodicalIF":7.9,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Physics-guided ODE neural network for high-fidelity gearbox dynamics modeling based on vibration measurements","authors":"Rui He ,&nbsp;Xingkai Yang ,&nbsp;Yifei Wang ,&nbsp;Zhigang Tian ,&nbsp;Mingjian Zuo ,&nbsp;Zhisheng Ye","doi":"10.1016/j.ymssp.2025.112720","DOIUrl":"10.1016/j.ymssp.2025.112720","url":null,"abstract":"<div><div>High-fidelity dynamics modeling of gearboxes is the prerequisite for developing digital twins capable of elucidating failure behaviors under varying speed conditions. However, traditional approaches, such as finite element and lumped parameter models, often exhibit discrepancies from real-world measurements. This issue is particularly pronounced in complex systems, which limits their practical applicability. To overcome this limitation, we propose a novel physics-guided ordinary differential equation (ODE) neural network. This method integrates a neural network into the gearbox dynamics model to address model incompleteness, specifically the discrepancies between theoretical predictions and actual system behavior. Real acceleration measurements are utilized to calibrate both the neural network and the overall dynamics model, enabling the inference of unknown dynamic parameters without the need for prior determination. By aligning simulated responses with experimental data, the model captures system dynamics with high accuracy. The proposed physics-guided ODE neural network is fully differentiable with respect to both model incompleteness and undetermined dynamic parameters. The effectiveness of this high-fidelity modeling approach is demonstrated using an experimental two-stage gearbox system. Validation against experimental test rig data under varying rotational speeds and faulty conditions confirms the model capability to replicate real-world dynamic responses.</div></div>","PeriodicalId":51124,"journal":{"name":"Mechanical Systems and Signal Processing","volume":"232 ","pages":"Article 112720"},"PeriodicalIF":7.9,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A low-frequency unidirectional-strain-mode bistable piezoelectric vibration energy harvester via prestressing curved vibrators","authors":"Chenyang He ,&nbsp;Shijie Lin ,&nbsp;Mingxuan Liu ,&nbsp;Li Zhang ,&nbsp;Junwu Kan ,&nbsp;Fanxu Meng ,&nbsp;Zhonghua Zhang","doi":"10.1016/j.ymssp.2025.112692","DOIUrl":"10.1016/j.ymssp.2025.112692","url":null,"abstract":"<div><div>Vibration energy harvesting using piezoelectric transduction becomes increasingly popular as a promising alternative to electrochemical batteries for powering low-power wireless and portable electronic devices. A low-frequency unidirectional-strain-mode bistable piezoelectric vibration energy harvester (USB-PVEH) is proposed to offer a viable solution to the possible damage caused by the bidirectional deformation of piezoelectric plates in this paper. The salient characteristics of the USB-PVEH were that bistable vibration energy harvesting was implemented via the unidirectional-strain piezoelectric vibrators which were constructed by prepressuring two initially-curved piezoelectric plates. Also, the deformation of pre-bent piezoelectric vibrators subjected to the unidirectional compressive strain wasn’t directly induced by the external vibration source but triggered indirectly by the elastic beam. To prove the structural feasibility and ascertain the influence of adjustable magnet installation parameters on the energy harvester, the theoretical investigation, simulation, fabrication and experimental testing were conducted. The results showed that the potential well structure in nonlinear magnetic force can be altered by adjusting installation parameters such as the horizontal distance, vertical distance and installation angle of the adjustable magnet, thereby modifying the dynamic performance of the energy harvester. Additionally, the USB-PVEH exhibited an optimal parameter combination (<em>d</em> = 14 mm, <em>h</em> = 6 mm, <em>α</em> = 67.5°), where the natural frequency was 16 Hz and the effective bandwidth was 19.6 Hz. Furthermore, the maximum output power of the USB-PVEH could reach 5.27 mW at 16 Hz with the optimal load resistance of 70 kΩ. Consequently, it is expected that the USB-PVEH can provide reference for the structural design of PVEH in high-amplitude environments.</div></div>","PeriodicalId":51124,"journal":{"name":"Mechanical Systems and Signal Processing","volume":"232 ","pages":"Article 112692"},"PeriodicalIF":7.9,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel unified dynamical modeling of perforated plates based on negative mass equivalence","authors":"Kaiyuan Tian ,&nbsp;Yilong Wang ,&nbsp;Bo Fang ,&nbsp;Dengqing Cao ,&nbsp;Kaiping Yu ,&nbsp;Xutao Mei","doi":"10.1016/j.ymssp.2025.112723","DOIUrl":"10.1016/j.ymssp.2025.112723","url":null,"abstract":"<div><div>Plate-shaped structures are extensively utilized in aerospace, automotive, marine, and civil engineering, often featuring holes or cutouts for weight reduction, material savings, and design flexibility. However, the irregular shapes of their structures pose challenges in accurately extracting modal shapes using traditional analytical dynamical modeling methods. To address this challenge, this paper proposes a novel semi-analytical method for modal extraction in flat plates, particularly suitable for those with holes or cutouts, based on negative mass equivalence. Taking the perforated flat plates as examples, their dynamical models are developed using polynomial interpolation with Chebyshev polynomials and the Rayleigh-Ritz method. The concepts of “negative mass” and “positive mass” are employed to represent the features of openings, with Lagrange multipliers ensuring compatibility at connection nodes. Model validations are performed through comparisons of results regarding the natural frequencies, modal shapes, and dynamical responses obtained from this method, the finite element method, and the experimental method. The results demonstrate that the RMS error of the natural frequency is within 3.89 % and the accuracy of the model improves as the number of polynomial terms and connection nodes increases. Furthermore, the proposed method employs analytical modal shapes with minimal degrees of freedom to develop models, achieving exceptional computational efficiency with over 98 % time savings compared to the finite element method. This work provides a new pathway for advancing dynamical modeling methods of plates and enhancing simulation efficiency, with the potential to contribute to the development of active control and aeroelastic analysis techniques in plate-shaped structures.</div></div>","PeriodicalId":51124,"journal":{"name":"Mechanical Systems and Signal Processing","volume":"232 ","pages":"Article 112723"},"PeriodicalIF":7.9,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A two-harmonic homotopy method to experimentally uncover isolated resonances","authors":"Ghislain Raze,&nbsp;Gaëtan Kerschen","doi":"10.1016/j.ymssp.2025.112670","DOIUrl":"10.1016/j.ymssp.2025.112670","url":null,"abstract":"<div><div>Secondary resonances of nonlinear systems may appear as isolated branches of solutions, challenging their characterization and making them particularly difficult to observe experimentally. This work exploits a two-harmonic homotopy method that leverages two-harmonic forcing as a proxy to connect primary and secondary resonances. An experimental implementation with simple feedback controllers is presented. This approach is then validated with an electronic Duffing oscillator and a doubly clamped beam featuring a distributed geometrical nonlinearity. It is shown to experimentally uncover isolas in both of these examples.</div></div>","PeriodicalId":51124,"journal":{"name":"Mechanical Systems and Signal Processing","volume":"232 ","pages":"Article 112670"},"PeriodicalIF":7.9,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rotor states of motion estimation using on-shaft MEMS accelerometers","authors":"Dennis Janssens ,&nbsp;Jan Croes ,&nbsp;Claus Claeys ,&nbsp;Frank Naets","doi":"10.1016/j.ymssp.2025.112658","DOIUrl":"10.1016/j.ymssp.2025.112658","url":null,"abstract":"<div><div>This paper presents a novel method for measuring rotational acceleration, speed, and position in industrial applications involving stationary mounted rotating drivelines. The proposed method utilizes shaft-mounted MEMS type accelerometers, while accounting for imperfect mounting, non-matched sensitivity of the sensors, and possible misalignment. By combining linear accelerations from accelerometers mounted on the surface of a rotating driveshaft with a state space model of the rotational states of motion in an extended Kalman filter, the proposed method provides accurate measurements with great flexibility in sensor placement. Next to the method to obtain the states of motion, a calibration strategy is also introduced to deal with often unknown sensor parameters. The data can be transmitted over a slip ring or by wireless transmission, making it a convenient and cost-effective approach for obtaining rotational states of motion in industrial settings.</div></div>","PeriodicalId":51124,"journal":{"name":"Mechanical Systems and Signal Processing","volume":"232 ","pages":"Article 112658"},"PeriodicalIF":7.9,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Frequency response data-based feedforward control strategy for ultra-precision tool servo diamond turning of freeform surfaces","authors":"Hao Wu ,&nbsp;YiXuan Meng ,&nbsp;DingKun Meng ,&nbsp;Rui Wang ,&nbsp;ZhiWei Zhu ,&nbsp;MingJun Ren ,&nbsp;XinQuan Zhang ,&nbsp;LiMin Zhu","doi":"10.1016/j.ymssp.2025.112706","DOIUrl":"10.1016/j.ymssp.2025.112706","url":null,"abstract":"<div><div>Tool servo diamond turning faces significant challenges when machining freeform surfaces at relatively high speeds, primarily due to tracking errors caused by the limited bandwidth of the servo axis. Integrating an additional feedforward controller with existing controllers is often necessary to enhance tracking performance. However, the design of a closed-loop inversion-based feedforward controller generally relies on an accurate transfer function of the controlled system, which is frequently compromised by unavoidable modeling errors. To address this issue, this paper proposes a novel frequency response data (FRD)-based feedforward control strategy for trajectory modification in tool servo diamond turning. This strategy directly utilizes the FRD to design a flexible-order finite impulse response filter that approximates the inverse behavior of the servo axis. A constrained optimization problem is formulated to obtain a flat amplitude and phase frequency response within the interested bandwidth, with the differential evolution algorithm adopted to determine the optimal filter parameters. Experimental validation on a commercial ultra-precision lathe confirms the effectiveness of the proposed strategy. Comparative results reveal a substantial enhancement in the form accuracy of the machined freeform surfaces, achieving a 70% reduction in the PV error and a 96% reduction in the RMS error compared to those obtained without the feedforward controller. The simplicity and efficiency of this strategy make it well-suited for industrial ultra-precision machining applications.</div></div>","PeriodicalId":51124,"journal":{"name":"Mechanical Systems and Signal Processing","volume":"232 ","pages":"Article 112706"},"PeriodicalIF":7.9,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}