Article
Mechanics
Ramazan-Ali Jafari-Talookolaei, Mostafa Attar, Paolo S. Valvo, Farzaneh Lotfinejad-Jalali, Seyedeh Farzaneh Ghasemi Shirsavar, Morteza Saadatmorad
Summary: In this paper, the flapwise and chordwise free vibrations of a rotating laminated composite beam are studied using the finite element method. The results can contribute to a more accurate prediction of the free vibration response of rotating composite beams.
COMPOSITE STRUCTURES
(2022)
Article
Acoustics
Jun Wu, Branislav Titurus
Summary: A new vibration suppression method is proposed in this paper for a rotating Timoshenko beam axially loaded by a tendon with the inerter-damper guiding elements. The effectiveness of vibration suppression is closely related to the optimal tuning strategy and the use of inerter-dampers as guiding elements.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Aerospace
Yanan Wu, Haijun Xuan, Changyao Wu, Dong Mi, Mingmin Qu, Tao Jin
Summary: This study investigated the effect of underplatform dampers (UPDs) on the forced torsional vibration response of turbine blades within a multi-blade system. Pre-stressed finite element modal analysis and the harmonic balance method were used to calculate the vibration responses. The experiments on a rotating multi-blade system showed that UPDs could effectively reduce blade torsional vibration but excessive force could lead to large vibration peaks.
Article
Materials Science, Multidisciplinary
Nasser Firouzi, Sayyed Roohollah Kazemi
Summary: This paper investigates the enhancement of vibration suppression of thick beams. By adding extra boundary conditions, the stability of the beam is increased. Moreover, considering the thick beam reveals that the equivalent damping of the beam enhances, resulting in an increase in excitation amplitude and frequency, and thus improving the stability of the beam.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Acoustics
Venkateswararao Manchi, C. Sujatha
Summary: The study proposed a centrifugal double pendulum vibration absorber (CDPVA) to simplify the design for higher orders by deploying two pendulums in series; the mass and length values of the double pendulum are tuned to match the two natural frequencies, with torsional springs used at the pivot joints to counteract gravitational effects; through numerical simulation and actual testing, the designed CDPVA proved to be effective in reducing torsional vibration and vibration levels.
Article
Engineering, Aerospace
Hesheng Han, Lihua Tang, Jianing Wu, Shupeng Sun, Peilun Yin, Dengqing Cao
Summary: A Kresling-origami-inspired isolator (KOI) with quasi-zero stiffness (QZS) property is proposed in this work, which can achieve vibration isolation in axial, torsional, and coupled vibrations. The KOI utilizes a design with a bi-stable base and the special point Case-Q to achieve QZS property. The dynamic responses of the KOI are calculated and compared with simulation results, showing good agreement. The transmissibility of the KOI under axial and torsional vibrations demonstrates efficient vibration isolation performance, even for weak excitations, due to its nonlinearity.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Zhi-Yuan Wu, Han Yan, Lin-Chuan Zhao, Ge Yan, Zhi-Bo Yang, Hai-Feng Hu, Wen-Ming Zhang
Summary: A novel axial-bending coupled breathing crack model for rotating blades is proposed in this study, providing valuable insights for fault diagnosis and safety monitoring of cracked blades.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Ocean
Jun Liu, Shuang Liang, Yili Chen, Min Zhang
Summary: In this study, a coupled nonlinear vibration model for riserless drill-string in deepwater, considering both seawater and stratum sections, was established. The effectiveness of the model was demonstrated qualitatively and quantitatively using torsional vibration model results and field test data. The research provides an effective analysis method and theoretical guidance for riserless drill-string design.
APPLIED OCEAN RESEARCH
(2023)
Article
Mechanics
Buesra Uzun, Omer Civalek, Mustafa Tzgur Yayli
Summary: In this study, the size-dependent torsional and longitudinal free vibrations of restrained saturated porous nanorods are investigated using a higher-order elasticity theory. The strain gradient elasticity model is employed to overcome the inconsistencies of the classical elasticity model. The proposed higher-order model provides a well-posed boundary value problem for any small size parameter value. The dynamic response of the nanorods is significantly influenced by the elastic spring coefficients, small-scale parameter, and saturation.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Acoustics
Daniel J. Segalman, Firas A. Khasawneh
Summary: This article discusses the vibration response and research methods of stepped beams, focusing on the transfer matrix method (TMM). The TMM models each step of the beam as a uniform element, utilizing local eigenfunctions to describe the vibration characteristics. The article also presents a reformulation for stepped Euler-Bernoulli beams that addresses numerical singularity problems.
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
Qihang Li, Can Chen, Shuai Gao, Yinglin Ren, Weimin Wang
Summary: This paper investigates the nonlinear coupling between bending and torsional vibrations in rotor systems and proposes a method to improve the efficiency of transient numerical simulation. Through numerical simulations and experimental validation, it is found that torsional excitation generates sideband frequency components in CBT models and the effect of gravity is significant.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Mehrdad Mohammadnejad
Summary: In this paper, a new Fredholm transformation approach is proposed to analyze the flapwise-bending vibration of nano-beams. The effects of size-dependency are investigated using Eringen non-local elasticity theory, while the rotatory inertia effect on the flapwise vibration of the beam is studied using Rayleigh theory. The novelty of this approach lies in the introduction of a new change of variable, which simplifies and shortens the solution process. The accuracy of the approach is verified through comparison with numerical results available in other published references.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Engineering, Civil
Hamid Reza Balali Dehkordi, Yaghoub Tadi Beni
Summary: This paper investigates the coupled bending and torsional vibration analysis of microbeams under axial force based on Timoshenko's beam theory. The motion equations of the system are established using the modified non-classic coupled stress theory and the Hamilton principle. The generalized differential quadratures method is used to solve the obtained set of differential equations. The results show excellent agreement with other researchers' results and provide insights into the influence of various factors on natural frequencies.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Acoustics
Fan Yang, Yong-Chen Pei
Summary: This paper proposes a novel vibration control method, named position phase-based vibration suppression method, for the rotating flexible disk system under parametric excitations. By applying external parametric excitation and adjusting the position phase angle, this method can efficiently achieve vibration suppression. Two vibration evaluation indexes are proposed and the usable phase region for vibration suppression is determined.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Mechanical
Qian Xiong, Hong Guan, Hui Ma, Zhiyuan Wu, Xumin Guo, Weiwei Wang
Summary: This study proposes a nonlinear dynamic model for a rotating cracked blade considering the breathing effect, and a new crack fault diagnosis indicator is also proposed. Verification and analysis show that the severity of the crack affects the energy response, and vibration characteristic parameters can be effectively used for crack fault diagnosis.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Hongzheng Han, Kaigang Yuan, Hui Ma, Zhike Peng, Zhanwei Li, Songtao Zhao, Bangchun Wen
Summary: This paper accurately calculates the initial gaps considering tooth broken faults based on tooth contact analysis, and yields the time-varying mesh stiffness and non-load transmission error using a loaded tooth contact analysis program. The study finds that neglecting the mesh stiffness of missing tooth profiles would lead to serious corner contact phenomenon, and the simulation result considering the corner contact effect is closer to the experimental result.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Mechanical
Pengfei Wang, Yang Yang, Hui Ma, Hongyang Xu, Xu Li, Zhong Luo, Bangchun Wen
Summary: This paper studies the vibration characteristics of cage fracture faults in rolling bearings from both simulation and experimental aspects. It finds that when cage fracture occurs, the system amplitude increases and obvious impact vibration characteristics appear, and the vibration energy gradually concentrates to low-frequency vibration. These results provide important reference for the identification and diagnosis of rolling bearing misalignment and cage fracture.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Xiantao Zhang, Yongfeng Yang, Hui Ma, Mingming Shi, Ping Wang
Summary: This paper proposes a novel diagnosis indicator for rotor systems with rub-impact fault. The indicator takes into account the force, velocity, and phase information in a time interval and is developed based on the vibration power flow theory. The results of theoretical analysis and experiments show that the proposed indicator can accurately detect the severity of rub-impact faults.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Computer Science, Interdisciplinary Applications
Zizhen Qiao, Kangkang Chen, Changjiang Zhou, Hui Ma
Summary: A novel simulation dynamic model is established for the two-stage cracked gear drive of wind turbines based on fracture mechanics theory. The results of simulation and experiment verify the proposed model and reveal the significant influence of cracks on the mesh stiffness and dynamic characteristics of the gears.
SIMULATION MODELLING PRACTICE AND THEORY
(2023)
Article
Engineering, Electrical & Electronic
Xiaoyu Fan, Wenchao Liang, Jin Zeng, Yang Yang, Hui Ma, Chenguang Fan, Shunguo Fu
Summary: A reduced dynamic model of a rotating blade with a dovetail fixture is established, taking into account rotation-induced effects and using the fixed-interface method in ANSYS. Various parameters affecting the nonlinear vibration responses of the system are discussed, including rotating speed, friction factor, and stator blade number. The results show that contact-induced nonlinearity, friction factor, and stator blade number have significant effects on the system's vibration behavior.
Article
Automation & Control Systems
Yongchao Zhang, Zhaohui Ren, Ke Feng, Kun Yu, Hui Ma, Zheng Liu
Summary: This article proposes a novel transformer-enabled multisensor collaborative cross-domain intelligent diagnosis framework, which can achieve the transformation and fusion of diagnostic knowledge among multiple sensors. Experimental results show that the proposed method has significant benefits for the health management of complex rotating machinery.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Acoustics
Hongxu Tian, Haixu Wang, Xiaoyu Zhao, Hui Ma
Summary: This paper establishes a dynamic model of Geared turbofan (GTF) star gear-rotor coupling system, considering the flexibility of various components. The study finds that structural flexibility significantly affects the modal characteristics of the system. The counter-rotating between the low-pressure rotor and the fan rotor results in frequency veering, and low frequency excitation at star gear train can cause resonant vibration of the rotor.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Mechanical
Hongyang Xu, Pengfei Wang, Hui Ma, Yang Yang, Xiaopeng Li, Zhong Luo, Qingkai Han, Bangchun Wen
Summary: Clearance fit is a common assembly method for bearings in rotor systems, which can affect the mechanical properties of the bearing and rotor system. This study proposes a three-dimensional clearance fit model considering the fillet and six-degree-of-freedom motion of the outer ring, along with an analytical stiffness model for ball bearings. By coupling these models with a finite element model of a spindle, a dynamic model of a multi-supported rotor system is established and experimentally verified, taking into account the nonlinear factors of ballraceway contact and outer ring-bearing pedestal contact. The effects of fit clearance, radial force, and axial force on the vibration behavior and contact characteristics of the ball bearing are analyzed.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Jin Zeng, Yang Yang, Hui Ma, Yiren Yang, Chenguang Fan
Summary: Developed a dynamic modelling strategy that considers the structural flexibility and rotating effects in the shaft, disk, and blade components. Successfully addressed the couplings of the shaft-disk and disk-blade using the penalty method and compatibility equation of deformation. Verified the improved modelling strategies for the shaft-disk coupling system, with and without blade components, by comparing with experimental and solid model results. Demonstrated the accuracy and efficiency of the beam-shell hybrid model in simulating the dynamic characteristics of the shaft-disk coupling system with and without blades.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2023)
Article
Metallurgy & Metallurgical Engineering
Wen-kang Huang, Hui Ma, Zhi-fang Zhao, Peng-fei Wang, Zhi-ke Peng, Xiao-xu Zhang, Song-tao Zhao
Summary: Elastohydrodynamic lubrication (EHL) plays a crucial role in improving the stability and reliability of gear transmissions by reducing surface deformation and friction. A proposed model investigates the complex relationship between EHL and time-varying mesh stiffness (TVMS) in spur gears and aims to solve the TVMS under EHL. The model incorporates EHL, slice coupling, extended tooth contact (ETC), gear body coupling flexibility, and modified tooth stiffness. The effects of EHL and slice coupling on meshing characteristics are analyzed, showing that considering slice coupling significantly increases the TVMS of gears with crowning and shifts the load distribution towards the middle of the tooth side.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Engineering, Mechanical
Zhanwei Li, Xinliang Tian, Binrong Wen, Hui Ma, Weimin Ding, Hetao Song, Linqiao Wang, Zhike Peng
Summary: In this study, an integrated wind turbine transmission system is established, considering the effects of blade flexibility, centrifugal/Coriolis force, centrifugal force of the planet gear, flexibilities of gear shafts, and generator torque controller. The dynamic characteristics of the transmission system in non-stationary conditions are analyzed using a 5-MW wind turbine. The results show that optimal power point tracking results in increased generator torque fluctuation and poor power quality, and sudden changes in wind speed greatly influence angle of attack and radial displacement of the planet gear.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Hongxu Tian, Wenkang Huang, Zimeng Liu, Hui Ma
Summary: This paper presents an efficient method for obtaining the dynamic mesh stiffness and dynamic response of a helical gear pair. Unlike the traditional dynamic model that utilizes a time-dependent sequence, the mesh stiffness using the presented method is updated according to the gear displacement vector at each sub-step of the numerical calculation. Three-dimensional loaded tooth contact analysis (3D LTCA) is used to determine the mesh stiffness, and a surrogate model based on sparse polynomial chaos expansion (SPCE) is proposed to improve the computational efficiency. The results suggest that the SPCE model exhibits high accuracy and can significantly improve the computational efficiency of the PCE model, making it suitable for dynamic calculations.
Article
Mechanics
Hong Guan, Hui Ma, Yang Yang, Pengfei Wang, Hongyang Xu, Qian Xiong, Ming Liu
Summary: This article investigates the influence of assembly errors on the vibration responses of a dual-rotor-gear-bearing system with rubbing. A finite element model of the system is built, and a new model to simulate angular misalignment of gears is proposed. The nonlinear dynamic characteristics of the system are analyzed under different misalignment angles and rotating speeds.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Mechanical
Hong Guan, Qian Xiong, Hui Ma, Yang Yang, Jin Zeng, Pengfei Wang, Yingli Bao
Summary: This study establishes a finite element model of a gear-dual-rotor system considering gear meshing excitation, and a reduced dynamic model using the fixed interface component mode synthesis method. The study finds that gear meshing is a new cause of partial rubbing and reveals interesting phenomena in transversal and torsional responses.
MECHANISM AND MACHINE THEORY
(2024)
Proceedings Paper
Computer Science, Artificial Intelligence
Tao Yang, Yiyuan Zhou, Qidong Tang, Feng Xu, Hui Ma, Jieru Zhao, Li Jiang
Summary: Sparsity is important in deep learning models for efficiency and scalability. The proposed SpMMPlu compiler plug-in extends the representation and optimization ability for SpMM in current deep learning compiler frameworks. It introduces a flexible intermediate representation called Sparse IR and uses a two-step method to achieve efficient Sparse IR for each sparsity pattern.
2023 60TH ACM/IEEE DESIGN AUTOMATION CONFERENCE, DAC
(2023)
