Article
Engineering, Mechanical
Xiang Liu, Chunqi Wang, Yumin Zhang, Lixi Huang
Summary: An investigation into a smart micro-perforated panel aims to enhance the sound absorption performance of MPP absorbers at low frequencies, utilizing a combination of mechanical damping, electrical shunt damping, and Helmholtz resonance. Different multimode shunt design methods are explored to intensify panel vibration and improve sound absorption, with absorption peaks induced by electromechanical coupling found at frequencies lower than the MPP's Helmholtz resonance frequency.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Mechanical
Weiping Yang, Yatsze Choy, Ying Li
Summary: In this study, the sound absorption performance of a wavy micro-perforated panel absorber (WMPPA) is investigated. The WMPPA exhibits promising potential for the control of low-frequency and broadband noise, with improved sound absorption performance at lower frequencies and additional absorption peaks in the middle to high-frequency range. The study validates the proposed model and uncovers the acoustical properties and performance enhancements of the WMPPA.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Xiyue Ma, Daniil Yurchenko, Kean Chen, Lei Wang, Yang Liu, Kai Yang
Summary: This paper investigates the performance of a new type of sound-controlled micro-perforated panel absorber, which achieves wide-band perfect low-frequency sound absorption using a point force controlled backing panel. The theoretical model is established and the influence of structure size and point force position on sound absorption performance is explored. Experimental tests are conducted to validate the findings, and the physical mechanisms of active control are analyzed. A simplified error sensing strategy is also constructed. The results show that locating the point force at the center or using a relatively small sized absorber can achieve perfect sound absorption in a wide controllable bandwidth.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Acoustics
Chenhao Dong, Zhao Liu, Robert Pierce, Xiaoling Liu, Xiaosu Yi
Summary: A new micro perforated sandwich panel with honeycomb-hierarchical pore structure core is developed in this study. By combining carbonized cotton with hierarchical pore structure and a micro perforated honeycomb core, the sound-absorbing performance of the structure is enhanced without significant weight increase. Experimental results show that the average sound absorption coefficient of the structure can be improved from 0.220 to 0.558 with pure carbonized cotton filling, and further increased to 0.626 with hierarchical pore structure. Additionally, theoretical and finite element models are established with prediction errors of 16.8% and 8.6% respectively.
Article
Engineering, Mechanical
Wei He, Xiangjun Peng, Fengxian Xin, Tian Jian Lu
Summary: This study investigates the superior sound absorption performance of ultralight micro-perforated sandwich panels with double-layer hierarchical honeycomb core. Theoretical model predictions and numerical simulations validate the physical mechanisms underlying sound absorption, with systematic parametric study revealing optimal structural parameters for maximizing sound absorption. Viscous dissipation of air inside micro-perforations and around inlet/outlet regions is shown to dominate sound absorption, while the proposed hierarchical construction offers improved load-bearing capacity and significantly enhanced sound absorption across a wide frequency range compared to panels with regular honeycomb core.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Construction & Building Technology
Gunawan, Iwan Prasetiyo, Brian Yuliarto, Azma Putra, Irianto
Summary: Woven fabric perforation is beneficial for meeting the microstructure requirement of a micro-perforated panel absorber. The use of minute holes created by woven fabrics allows for the fabrication of high perforation ratio MPP with a diameter of 0.1-0.3 mm. The study discusses the properties of these minute holes and their associated absorption characteristics. Theoretical results and experimental investigations validate the findings, showing that controlling weft yarn density can successfully fabricate minute holes. The woven fabrics can achieve a half-absorption bandwidth of up to 5000 Hz (>3 octaves) with a peak absorption coefficient of over 0.8, and changing hole diameter can affect absorption behavior. The study confirms the applicability of Maa's model for predicting absorption of MPP using woven fabric material.
Article
Acoustics
Heming Li, Jinwu Wu, Shanlin Yan, Qibo Mao
Summary: This paper presents the design and development of micro-perforated panel (MPP) absorbers with a variable section partition to solve the broadband sound absorption problem. Three types of MPP absorbers were developed based on the cavity, and their absorption characteristics were investigated and optimized. Experimental results show that the optimized absorbers have superior broadband sound absorption performance compared to conventional MPP absorbers.
Article
Engineering, Mechanical
Xuewei Liu, Maolin Liu, Fengxian Xin
Summary: This article presents a new type of low-frequency sound absorbing Helmholtz resonator, with theoretical models verified by simulations and experiments. The influences of various factors on sound absorption are studied, and an energy dissipation compensation mechanism is discovered. This new resonance metamaterial provides a new avenue for the design of low-frequency sound absorbers.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Acoustics
Xiyue Ma, Kean Chen, Lei Wang, Yang Liu, Shaohu Ding
Summary: This paper presents a theoretical investigation on actively controlling the low frequency sound absorption of large-sized micro-perforated panel absorber (MPPA) by using point source placed in the cavity. Results show that the sound absorption performance can be significantly improved, with the optimal position of the point source at the central of the cavity section. The control mechanism is to enhance the Helmholtz type resonant absorption.
Article
Acoustics
Pyung-Sik Ma, Hyun-Sil Kim, Seong-Hyun Lee, Yun-Ho Seo
Summary: In this study, micro-perforated panel (MPP) resonators are designed to achieve quasi-perfect absorption in a two-port system. By coupling multiple resonators, near-zero transmission and reflection can be achieved simultaneously, leading to near-unity absorption over a broadband frequency range.
Article
Acoustics
Shanlin Yan, Jinwu Wu, Jie Chen, Yin Xiong, Qibo Mao, Xiang Zhang
Summary: The study investigated the sound absorption performance of micro-perforated plate under different parameters and designed two single-layer honeycomb micro-perforated plate structures using optimization algorithm to achieve broadband sound absorption. Experimental results showed that the depth of the perforations had a significant impact on the sound absorption performance, and using particle swarm optimization algorithm can improve the performance.
Article
Physics, Applied
Xiao Liang, Jiaming Chu, Xiangjun Ouyang, Qifu Yang, Zhuo Zhou, Haofeng Liang, Zhen Yang, Liang Su, Wenjie Wang
Summary: In this paper, a composite sound absorption structure with labyrinthine units and a micro-perforated panel (MPP) is proposed for the manipulation of sound waves in a fluid medium. The sound absorption mechanism is investigated using numerical and simulation methods, and it is found that acoustic streaming effects have a significant impact on the absorption mechanism. The sound absorption is attributed to sound energy focusing, local resonance, and acoustic energy localization and dissipation effects. The proposed structure exhibits good sound absorption performance and provides a new approach for the design and optimization of sonic black hole (SBH) structures.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Acoustics
Xiyue Ma, Lei Wang, Kean Chen, Xuhua Tian
Summary: This paper presents a comprehensive investigation on the passive and active low frequency sound absorption performance of the finite and large sized micro-perforated panel absorber (FLS-MPPA) for oblique incidence excitation (OIE). The theoretical model of the FLS-MPPA is established and validated, and the passive sound absorption performance and physical mechanisms are explored. The active control performance and physical mechanism of sound absorption improvement are also analyzed.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
He Xu, Deyi Kong
Summary: This paper describes the theoretical prediction, simulation research, and experimental verification of finite cylindrical micro-perforated panel absorbers (FC-MPPAs) in noise control. The results show that FC-MPPAs have unique acoustic characteristics and their structural parameters are closely related to acoustic energy dissipation efficiency. The studies provide helpful insights for the design and application of FC-MPPAs to achieve better noise reduction effects.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Acoustics
Jingfeng Ning, Qian Geng, M. P. Arunkumar, Yueming Li
Summary: A light composite absorber with a micro-perforated sandwich panel filled with thin porous materials is proposed in this study to achieve a wide absorption bandwidth. The theoretical model derived by the transfer matrix method is in good agreement with experimental results, showing better performance compared to other absorbers. The absorption mechanism and the effects of internal components on absorption performance are analyzed in detail.
Article
Acoustics
Ning Han, Chunqi Wang
NOISE CONTROL ENGINEERING JOURNAL
(2015)
Article
Acoustics
Chunqi Wang, Lixi Huang
JOURNAL OF SOUND AND VIBRATION
(2012)
Article
Acoustics
Chunqi Wang, Lixi Huang, Yumin Zhang
JOURNAL OF SOUND AND VIBRATION
(2014)
Article
Acoustics
Y. S. Choy, Lixi Huang, Chunqi Wang
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2009)
Article
Acoustics
Chunqi Wang, Li Cheng, Jie Pan, Ganghua Yu
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2010)
Article
Acoustics
Chunqi Wang, Lixi Huang
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2011)
Article
Materials Science, Multidisciplinary
Chunqi Wang, Jiayu Xiao, Jingcheng Zeng, Dazhi Jiang, Zhiqing Yuan
MATERIALS CHEMISTRY AND PHYSICS
(2012)
Article
Engineering, Mechanical
Chunqi Wang, Lixi Huang
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2012)
Article
Acoustics
Changyong Jiang, Chunqi Wang, Lixi Huang
Article
Engineering, Mechanical
Yumin Zhang, Chunqi Wang, Lixi Huang
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Physics, Applied
Yumin Zhang, Chunqi Wang, Lixi Huang
APPLIED PHYSICS LETTERS
(2020)
Article
Acoustics
Zhibo Wang, Yat Sze Choy, Chunqi Wang
JOURNAL OF SOUND AND VIBRATION
(2020)
Proceedings Paper
Acoustics
Chunqi Wang, Yumin Zhang, Lixi Huang
FLUID-STRUCTURE-SOUND INTERACTIONS AND CONTROL
(2016)
Article
Acoustics
C. Q. Wang, Y. S. Choy
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2015)
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)