Article
Construction & Building Technology
Zhihao Wang, Zhipeng Cheng, Hao Wang, Fangfang Yue, Hui Gao, Buqiao Fan
Summary: This paper develops a new inerter-based damper called the eddy-current inertial mass damper (ECIMD) and investigates the damping effect of installing two ECIMDs on a single stay cable through theoretical analysis, experimental study, and parameter optimization. Results show that the damping effect of ECIMDs is closely related to their installation position and mechanical properties.
STRUCTURAL CONTROL & HEALTH MONITORING
(2022)
Article
Acoustics
G. Shen, J. Macdonald, H. E. Coules
Summary: This paper introduces a nonlinear cable-supported model that considers the interaction between cables and the bridge deck in cable-stayed bridges. Analytical solutions are derived using scaling and averaging methods, revealing vibration behavior different from simple cable-only systems. The results highlight the strong influence of the mass ratio between cables and the deck on the cable-deck interaction.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Environmental Sciences
Maksat Kalybek, Mateusz Bocian, Wojciech Pakos, Jacek Grosel, Nikolaos Nikitas
Summary: This study demonstrates the potential of camera-based vibration monitoring systems in experimental modal analysis, showing high accuracy in modal parameters analysis under varying levels of intensity. However, effective application of these systems requires consideration of issues related to sensitivity, nature of excitation force, and signal and image processing.
Article
Engineering, Mechanical
Zhi-hao Wang, Zhi-peng Cheng, Guang-zhao Yin, Wenai Shen
Summary: Previous studies have shown that using passive control devices such as negative stiffness dampers (NSDs) and inertial mass dampers (IMDs) can effectively reduce vibration in stay cables. This study proposes a novel passive control device called magnetic negative stiffness eddy-current inertial mass damper (MNS-ECIMD) for cable vibration mitigation, which combines the advantages of both dampers. The performance of the MNS-ECIMD is validated through mechanical modeling and small-scale prototype testing, and its effect on cable vibration mitigation is analyzed through parametric analysis and numerical simulation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Acoustics
Yang Liu, Yan-wei Xu, Zhi-hao Wang
Summary: This study proposes using internal high damping rubber dampers and external negative stiffness dampers to control the multi-mode vibration of long stay cables. Through complex modal analysis and parametric studies, different coupling schemes are found to provide better control effects in different modal ranges, offering a diversified solution for multi-mode damping enhancement.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2023)
Article
Acoustics
Xuewen Yu, Danhui Dan
Summary: This paper proposes a 2D spectral analysis method based on damped Capon (dCAPON) and damped APES (dAPES) for structural modal parameter identification. The frequency and damping are estimated from the 2D dCAPON energy spectrum first, and then the amplitude (to construct the modal shape) corresponding to the frequency-damping point is calculated by the dAPES. The raw evenly-spaced computing grid is optimized into a banded hierarchically-refined one, greatly improving the computational efficiency. The performance of the proposed method is studied and it is investigated through the numerical and experimental data of a benchmark structure. The proposed method provides a simple and direct approach to estimating structural modal parameters, particularly for frequency and damping ratio.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
Xin Li, Zhi-peng Cheng, Zhi-hao Wang, Bu-qiao Fan
Summary: This paper investigates the coupled damping effect of a parallel-connected viscous mass damper (PVMD) and a grounded cross-tie on a single stay cable. The complex wave number equations of the cable-PVMD-cross-tie system are formulated through complex modal analysis. Parametric studies show that the optimal vibration control of the cable can be achieved by optimizing the installation positions of the cross-tie.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2022)
Article
Engineering, Civil
Mateusz Bocian, Nikolaos Nikitas, Maksat Kalybek, Mieszko Kuzawa, Pawel Hawryszkow, Jan Bien, Jerzy Onysyk, Jan Biliszczuk
Summary: This study investigates the dynamic performance of the largest one-pylon cable-stayed bridge in Poland using a consumer-grade digital camera and open access image-processing algorithms. The results show that a vibration monitoring system based on a consumer-grade digital camera can provide an economically viable alternative for monitoring the dynamic behavior patterns of large-scale bridges.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Engineering, Civil
Renjie Shen, Xiangdong Qian, Jianfang Zhou, Chin-Long Lee
Summary: In this paper, a modified eigensystem realization algorithm is extended to nonviscous damping system for modal parameter identification and relaxation parameter calculation. The state space formulation is used to express the equation of motion with nonviscous damping. The proposed method establishes a nonlinear relationship between the eigenvalues and the damping parameters of a nonviscous damping system. The accuracy of the method is verified through numerical examples.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Engineering, Civil
Renjie Shen, Xiangdong Qian, Jianfang Zhou, Chin-Long Lee
Summary: In this paper, a modified eigensystem realization algorithm is applied to identify modal parameters and relaxation parameters in nonviscous damping systems. The equation of motion with nonviscous damping is transformed into the state space formulation, and the equality between the eigenvalues of the second-order equation and the state space formulation is proved. The proposed method utilizes a nonlinear relationship between the eigenvalues and the damping parameters of the nonviscous damping system. The accuracy of the method is validated through three numerical examples.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Engineering, Mechanical
Hui Gao, Hao Wang, Jian Li, Jianxiao Mao, Zhihao Wang
Summary: A novel negative stiffness inerter damper (NSID) is proposed to improve the control performance of stay cables. The NSID utilizes the damping enhancement of negative stiffness and inerter for cable vibration control. The modal behavior of the cable based on optimum parameters of the NSID is explored, and the damping enhancement principle and conditions are demonstrated. The control efficacy of the NSID is evaluated, showing better performance than other dampers in mitigating multi-mode cable vibrations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Computer Science, Interdisciplinary Applications
Miaomin Wang, Fuyou Xu, Yan Xu, James Brownjohn
Summary: This paper proposes a subpixel refinement technique called self-adaptive edge points matching (SEPM) to accurately measure subpixel-level displacements under varying lighting conditions. The SEPM utilizes the gradient and shape information of the target edge contour and has demonstrated high accuracy in three different illumination tests.
COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Engineering, Mechanical
Hui Gao, Hao Wang, Jian Li, Jianxiao Mao, Zhihao Wang
Summary: A novel negative stiffness inerter damper (NSID) is proposed in this study to improve the control performance of stay cables. The NSID utilizes the damping enhancement of negative stiffness and inerter for cable vibration control. The study explores the modal behavior of the cable based on optimum parameters of the NSID and demonstrates the principle and conditions of the NSID for cable vibration control. The NSID performs better than other dampers in mitigating cable vibrations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Acoustics
Pranav Agrawal, Armaghan Salehian
Summary: This technical brief presents the experimental study and model validations for the damping mechanisms of cable-harnessed beam structures. The experimental and model results show very good agreements in predicting the structural damping induced by the cables.
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2021)
Article
Acoustics
Xin Zhang, Shuaitao Hu, Shixiang Zhang, Huaxin Zhu, Maosen Cao, Qiang Wang, Dragoslav Sumarac
Summary: This paper presents a vibration model for modal analysis and vibration control of a vertical cable-dual tuned mass damper (C-DTMD) coupled system. The model introduces non-dimensional parameters for describing the in-plane vibration and comprehensively studies the phenomenon of modal split. Parameter analysis shows the effect of various factors on vibration reduction. The proposed model accurately describes the in-plane vibration modes of C-DTMD systems and provides a basis for optimal damper design.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2023)
Article
Engineering, Mechanical
Xuanen Kan, Yanjun Lu, Fan Zhang, Weipeng Hu
Summary: A blade disk system is crucial for the energy conversion efficiency of turbomachinery, but differences between blades can result in localized vibration. This study develops an approximate symplectic method to simulate vibration localization in a mistuned bladed disk system and reveals the influences of initial positive pressure, contact angle, and surface roughness on the strength of vibration localization.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Zimeng Liu, Cheng Chang, Haodong Hu, Hui Ma, Kaigang Yuan, Xin Li, Xiaojian Zhao, Zhike Peng
Summary: Considering the calculation efficiency and accuracy of meshing characteristics of gear pair with tooth root crack fault, a parametric model of cracked spur gear is established by simplifying the crack propagation path. The LTCA method is used to calculate the time-varying meshing stiffness and transmission error, and the results are verified by finite element method. The study also proposes a crack area share index to measure the degree of crack fault and determines the application range of simplified crack propagation path.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Rongjian Sun, Conggan Ma, Nic Zhang, Chuyo Kaku, Yu Zhang, Qirui Hou
Summary: This paper proposes a novel forward calculation method (FCM) for calculating anisotropic material parameters (AMPs) of the motor stator assembly, considering structural discontinuities and composite material properties. The method is based on multi-scale theory and decouples the multi-scale equations to describe the equivalence and equivalence preconditions of AMPs of two scale models. The effectiveness of this method is verified by modal experiments.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Hao Zhang, Jiangcen Ke
Summary: This research introduces an intelligent scheduling system framework to optimize the ship lock schedule of the Three Gorges Hub. By analyzing navigational rules, operational characteristics, and existing problems, a mixed-integer nonlinear programming model is formulated with multiple objectives and constraints, and a hybrid intelligent algorithm is constructed for optimization.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Jingjing He, Xizhong Wu, Xuefei Guan
Summary: A sensitivity and reliability enhanced ultrasonic method has been developed in this study to monitor and predict stress loss in pre-stressed multi-layer structures. The method leverages the potential breathing effect of porous cushion materials in the structures to increase the sensitivity of the signal feature to stress loss. Experimental investigations show that the proposed method offers improved accuracy, reliability, and sensitivity to stress change.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Benyamin Hosseiny, Jalal Amini, Hossein Aghababaei
Summary: This paper presents a method for monitoring sub-second or sub-minute displacements using GBSAR signals, which employs spectral estimation to achieve multi-dimensional target detection. It improves the processing of MIMO radar data and enables high-resolution fast displacement monitoring from GBSAR signals.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xianze Li, Hao Su, Ling Xiang, Qingtao Yao, Aijun Hu
Summary: This paper proposes a novel method for bearing fault identification, which can accurately identify faults with few samples under complex working conditions. The method is based on a Transformer meta-learning model, and the final result is determined by the weighted voting of multiple models.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xiaomeng Li, Yi Wang, Guangyao Zhang, Baoping Tang, Yi Qin
Summary: Inspired by chaos fractal theory and slowly varying damage dynamics theory, this paper proposes a new health monitoring indicator for vibration signals of rotating machinery, which can effectively monitor the mechanical condition under both cyclo-stationary and variable operating conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Hao Wang, Songye Zhu
Summary: This paper extends the latching mechanism to vibration control to improve energy dissipation efficiency. An innovative semi-active latched mass damper (LMD) is proposed, and different latching control strategies are tested and evaluated. The latching control can optimize the phase lag between control force and structural response, and provide an innovative solution to improve damper effectiveness and develop adaptive semi-active dampers.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Menghao Ping, Xinyu Jia, Costas Papadimitriou, Xu Han, Chao Jiang, Wang-Ji Yan
Summary: Identification of non-Gaussian processes is a challenging task in engineering problems. This article presents an improved orthogonal series expansion method to convert the identification of non-Gaussian processes into a finite number of non-Gaussian coefficients. The uncertainty of these coefficients is quantified using polynomial chaos expansion. The proposed method is applicable to both stationary and nonstationary non-Gaussian processes and has been validated through simulated data and real-world applications.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Lei Li, Wei Yang, Dongfa Li, Jianxin Han, Wenming Zhang
Summary: The frequency locking phenomenon induced by modal coupling can effectively overcome the dependence of peak frequency on driving strength in nonlinear resonant systems and improve the stability of peak frequency. This study proposes the double frequencies locking phenomenon in a three degrees of freedom (3-DOF) magnetic coupled resonant system driven by piezoelectricity. Experimental and theoretical investigations confirm the occurrence of first frequency locking and the subsequent switching to second frequency locking with the increase of driving force. Furthermore, a mass sensing scheme for double analytes is proposed based on the double frequencies locking phenomenon.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Kai Ma, Jingtao Du, Yang Liu, Ximing Chen
Summary: This study explores the feasibility of using nonlinear energy sinks (NES) as replacements for traditional linear tuned mass dampers (TMD) in practical engineering applications, specifically in diesel engine crankshafts. The results show that NES provides better vibration attenuation for the crankshaft compared to TMD under different operating conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Wentao Xu, Li Cheng, Shuaihao Lei, Lei Yu, Weixuan Jiao
Summary: In this study, a high-precision hydraulic mechanical stand and a vertical mixed-flow pumping station device were used to conduct research on cavitation signals of mixed-flow pumps. By analyzing the water pressure pulsation signal, it was found that the power spectrum density method is more sensitive and capable of extracting characteristics compared to traditional time-frequency domain analysis. This has significant implications for the identification and prevention of cavitation in mixed-flow pump machinery.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xiaodong Chen, Kang Tai, Huifeng Tan, Zhimin Xie
Summary: This paper addresses the issue of parasitic motion in microgripper jaws and its impact on clamping accuracy, and proposes a symmetrically stressed parallelogram mechanism as a solution. Through mechanical modeling and experimental validation, the effectiveness of this method is demonstrated.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Zhifeng Shi, Gang Zhang, Jing Liu, Xinbin Li, Yajun Xu, Changfeng Yan
Summary: This study provides useful guidance for early bearing fault detection and diagnosis by investigating the effects of crack inclination and propagation direction on the vibration characteristics of bearings.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)