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Numerical modeling and experimental investigation of a two-phase sink vortex and its fluid-solid vibration characteristics

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第1期25卷 47-62页

作者： Zichao YIN Yesha NI Lin LI Tong WANG Jiafeng WU Zhe LI Dapeng TAN College of Mechanical Engineering Zhejiang University of TechnologyHangzhou310014China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou310058China

A sink vortex is a common physical phenomenon in continuous casting,chemical extraction,water conservancy,and other industrial processes,and often causes damage and loss in ***,the real-time monitoring of the sink vortex state is important for improving industrial production ***,its suction-extraction phenomenon and shock vibration characteristics in the course of its formation are complex mechanical dynamic factors for flow field state *** address this issue,we set up a multi-physics model using the level set method(LSM)for a free sink vortex to study the two-phase interaction ***,a fluid–solid coupling dynamic model was deduced to investigate the shock vibration characteristics and reveal the transition mechanism of the critical flow *** numerical results show that the coupling energy shock induces a pressure oscillation phenomenon,which appears to be a transient enhancement of vibration at the vortex penetration *** central part of the transient enhancement signal is a high-frequency *** on the dynamic coupling model,an experimental observation platform was established to verify the accuracy of the numerical *** water-model experiment results were accordant with the numerical *** above results provide a reference for fluid state recognition and active vortex control for industrial monitoring systems,such as those in aerospace pipe transport,hydropower generation,and microfluidic devices.

关键词： Free sink vortex Fluid-solid coupling Level set method(LSM) Multi-physics model vibration characteristics

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Research on the Influence of Raceway Waviness on the vibration characteristics of Deep Groove Ball Bearings

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Mechanical Engineering Science 2024年第1期6卷 13-20页

作者： Yuanlong CHEN Jiarui ZHOU Xinyu WEN Shaoqi WANYAN Yuqing WANG School of Mechanical Engineering Hefei University of TechnologyHefeiAnhui23009China

The dynamics model of a 2-degree-of-freedom deep groove ball bearing is established by incorporating the raceway surface waviness model comprising multiple sinusoidal functions *** model is solved using the fourth-order Runge-Kutta method to obtain the vibration characteristics including displacement,velocity,acceleration,and frequency of the *** of the model is accomplished through comparison with theoretical vibration *** influence of the amplitude of waviness of the inner and outer ring raceway surfaces of deep groove ball bearings on the vibration displacement,peak-to-peak vibration displacement and root-mean-square vibration acceleration is analyzed,and the results show that as the amplitude of the inner and outer ring raceway surfaces waviness increases,all the vibration characteristic indexes increase,indicating that the vibration amplitude of the bearings as well as the energy of the waviness-induced shock waveforms increase with the increase of the amplitude of the waviness.

关键词： Waviness Deep groove ball bearing vibration characteristics Dynamics

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vibration characteristics and machining performance of a novel perforated ultrasonic vibration platform in the grinding of particulate-reinforced titanium matrix composites

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Frontiers of Mechanical Engineering 2023年第1期18卷 179-195页

作者： Yang CAO Biao ZHAO Wenfeng DING Qiang HUANG National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Ultrasonic vibration-assisted grinding(UVAG)is an advanced hybrid process for the precision machining of difficult-to-cut *** resonator is a critical part of the UVAG *** performance considerably influences the vibration amplitude and resonant *** this work,a novel perforated ultrasonic vibration platform resonator was developed for *** holes were evenly arranged at the top and side surfaces of the vibration platform to improve the vibration characteristics.A modified apparent elasticity method(AEM)was proposed to reveal the influence of holes on the vibration *** performance of the vibration platform was evaluated by the vibration tests and UVAG experiments of particulate-reinforced titanium matrix *** indicate that the reasonable distribution of holes helps improve the resonant frequency and vibration *** modified AEM,the finite element method,and the vibration tests show a high degree of consistency for developing the perforated ultrasonic vibration platform with a maximum frequency error of 3%.The employment of ultrasonic vibration reduces the grinding force by 36%at most,thereby decreasing the machined surface defects,such as voids,cracks,and burnout.

关键词： ultrasonic vibration-assisted grinding perforated ultrasonic vibration platform vibration characteristics apparent elasticity method grinding force surface integrity

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vibration characteristics OF FLUID-STRUCTURE INTERACTION OF CONICAL SPIRAL TUBE BUNDLE

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Journal of Hydrodynamics 2010年第1期22卷 121-128页

作者： YAN Ke GE Pei-qi BI Wen-bo SU Yan-cai HU Rui-rong Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of Education School of Mechanical Engineering Shandong University Jinan 250061 China

Heat transfer enhancement is achieved by flow-induced vibration in elastic tube bundles heat exchangers. For a further understanding of heat transfer enhancement mechanism and tube structure optimization, it is of importance to study the vibration characteristics of fluid-structure interaction of tube bundles. The finite element method is applied in the study of fluid-structure interaction of a new type elastic heat transfer element, i.e., the dimensional conical spiral tube bundle. The vibration equation and element matrix for the tube are set up by the regulation of different helical angles and coordinate transformation, together with the simplification of the joint body of the two pipes. The vibration characteristics of conical spiral tube bundle are analyzed at different velocities of the tube-side flow, and the critical velocity of vibration buckling is obtained. The results show that the natural frequency of the tube bundle decreases as the flow speed increases, especially for the first order frequency, and the critical velocity of vibration buckling is between 1.2665 m/s-1.2669 m/s. The vibration mode of conical spiral tube bundle is mainly z-axial, which is feasible to be induced and controlled.

关键词： conical spiral tube heat exchanger finite element method fluid-structure interaction vibration characteristics

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Experimental investigation on vibration characteristics of the medium-low-speed maglev vehicle-turnout coupled system

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Railway Engineering Science 2022年第2期30卷 242-261页

作者： Miao Li Dinggang Gao Tie Li Shihui Luo Weihua Ma Xiaohao Chen State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China Maglev Transportation Engineering R&D Center Tongji UniversityShanghai 201804China City Rail Technical Development Department CRRC Dalian Locomotive and Rolling Stock Co.LtdDalian 116022China

The steel turnout is one of the key components in the medium–low-speed maglev line ***,the vehicle under active control is prone to vehicle–turnout coupled vibration,and thus,it is necessary to identify the vibration characteristics of this coupled system through field *** this end,dynamic performance tests were conducted on a vehicle–turnout coupled system in a medium–low-speed maglev test ***,the dynamic response data of the coupled system under various operating conditions were ***,the natural vibration characteristics of the turnout were analysed using the free attenuation method and the finite element method,indicating a good agreement between the simulation results and the measured results;the acceleration response characteristics of the coupled system were analysed in detail,and the ride quality of the vehicle was assessed by Sperling ***,the frequency distribution characteristics of the coupled system were *** these test results could provide references for model validation and optimized design of medium–low-speed maglev transport systems.

关键词： Medium–low-speed maglev Vehicle–turnout coupled system Field test vibration characteristics Ride quality

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vibration characteristics of Framed SUV Cab Based on Coupled Transfer Path Analysis

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Automotive Innovation 2019年第1期2卷 26-34页

作者： Wei Yang Jiqing Chen Zongjian Liu Fengchong Lan School of Mechanical and Automotive Engineering South China University of Technology and Guangdong Provincial Key Laboratory of Automotive EngineeringGuangzhou 510641China

The vibration transmission paths in a sport-utility vehicle with a frame structure were used to evaluate the coupled vibra-tion of each vibration transmission *** method was based on the transmission path of an“engine-powertrain mount system-frame-vehicle body suspension-body-driver seat rail,”and the research objective was to improve the vibration char-acteristics of the *** coupled transfer path analysis combined analysis and experiment to establish the vehicle vibration transmission path model and a finite element simulation *** this method,the vibration level of the driver’s seat rail was reduced and engineering practice was effectively used to improve the vibration characteristics of the *** method was applied to a framed SUV cabin.

关键词： Framed SUV SUV cabin vibration characteristics Coupling Transfer path

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vibration characteristics simulation and comparison of traditional cab system model and seat–cab coupled model for trucks

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第3期10卷 65-84页

作者： Leilei Zhao Yuewei Yu Changcheng Zhou Simon Feng School of Transportation and Vehicle Engineering Shandong University of Technology 12 Zhangzhou Road Zibo 255049ShandongP.R.China Shandong Automobile Spring Factory Zibo Co. Ltd.No.39Heji RoadHuantai Economic Development Zone Zibo 255049ShandongP.R.China

To define the application fields of the traditional cab system model and the seat–cab coupled model,this paper mainly aims to investigate the differences of the vibration characteristics of the two ***,the two models and their motion equations were ***,based on the mechanical parameters of the seat and cab system for a truck,the transmissibility characteristics of the two models were *** results show that the traditional model can relatively accurately predict the pitch and roll vibration characteristics of the real seat–cab ***,it overvalues the vertical vibration transmitted from the front suspensions of the ***,the typical excitation conditions and the measuring points were ***,under the typical excitation conditions,the dynamic responses of the measuring points were *** results show that under the vertical excitation condition,the dynamic responses of the two models have obvious *** the roll excitation condition and the pitch excitation condition,the roll responses and the pitch responses of the cab between the two models show almost no obvious *** the random excitation condition,the vertical acceleration responses have relatively larger deviations between the two models,however,the angular acceleration responses are almost the *** the preliminary design of the cab system,the traditional cab system model can be ***,for the accurate design and the optimization of the seat–cab system,the seat–cab coupled model is recommended.

关键词： Ride comfort traditional model seat-cab coupled model vibration characteristics

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vibration characteristics of a multi-block high-temperature superconducting maglev system

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Journal of Modern Transportation 2012年第2期20卷 98-102页

作者： Zhifang FU Lifeng ZHAO Xing LIANG Key Laboratory of Magnetic Levitation Technologies and Maglev Trains(Ministry of Education of China) Superconductivity and New Energy R&D CenterSouthwest Jiaotong UniversityChengdu 610031China

The multi-block high-temperature superconducting （HTS） maglev system has more complicated dynamic characteristics than the single-block HTS maglev system. To study its vibration characteristics, we designed a maglev measurement system. The system responses at the excitation frequencies of 2, 3 and 15 Hz were examined. Results show that the responses under excitation frequencies of 2 and 3 Hz include a 6 Hz component, which means that the maglev system is a critical nonlinear system. Moreover, the 6 Hz component is much stronger than the 2 Hz or 3 Hz components in the response spectra. There is the interaction between excitation and response. Under an excitation frequency of 15 Hz, intensified low-frequency perturbations were observed.

关键词： high-temperature superconductor vibration characteristics maglev system

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Application of Improved Hybrid Interface Substructural Component Modal Synthesis Method in vibration characteristics of Mistuned Blisk

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Chinese Journal of Mechanical Engineering 2014年第6期27卷 1219-1231页

作者： BAI Bin BAI Guangchen LI Chao School of Energy and Power Engineering Beihang University

The large and complex structures are divided into hundreds of thousands or millions degrees of freedom（DOF） when they are calculated which will spend a lot of time and the efficiency will be extremely low. The classical component modal synthesis method （CMSM） are used extensively, but for many structures in the engineering of high-rise buildings, aerospace systemic engineerings, marine oil platforms etc, a large amount of calculation is still needed. An improved hybrid interface substructural component modal synthesis method（HISCMSM） is proposed. The parametric model of the mistuned blisk is built by the improved HISCMSM. The double coordinating conditions of the displacement and the force are introduced to ensure the computational accuracy. Compared with the overall structure finite element model method（FEMM）, the computational time is shortened by23.86%–31.56%and the modal deviation is 0.002%–0.157% which meets the requirement of the computational accuracy. It is faster 4.46%–10.57% than the classical HISCMSM. So the improved HISCMSM is better than the classical HISCMSM and the overall structure FEMM. Meanwhile, the frequency and the modal shape are researched, considering the factors including rotational speed, gas temperature and geometry size. The strong localization phenomenon of the modal shape’s the maximum displacement and the maximum stress is observed in the second frequency band and it is the most sensitive in the frequency veering. But the localization phenomenon is relatively weak in 1st and the 3d frequency band. The localization of the modal shape is more serious under the condition of the geometric dimensioning mistuned. An improved HISCMSM is proposed, the computational efficiency of the mistuned blisk can be increased observably by this method.

关键词： modal shape mistuned blisk vibration characteristics computational efficiency computational accuracy

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Prediction of vibration characteristics in Beam Structure Using Sub-Scale Modeling with Experimental Validation

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Chinese Journal of Mechanical Engineering 2015年第5期28卷 928-934页

作者： ZAI Behzad Ahmed SAMI Saad KHAN M Amir AHMAD Furqan PARK Myung Kyun Structure Design and Development Directorate Institute of Space Technology Department of Civil and Environmental Engineering KAIST Department of Mechanical Engineering Myongji University

Geometric or sub-scale modeling techniques are used for the evaluation of large and complex dynamic structures to ensure accurate reproduction of load path and thus leading to true dynamic characteristics of such structures. The sub-scale modeling technique is very effective in the prediction of vibration characteristics of original large structure when the experimental testing is not feasible due to the absence of a large testing facility. Previous researches were more focused on free and harmonic vibration case with little or no consideration for readily encountered random vibration. A sub-scale modeling technique is proposed for estimating the vibration characteristics of any large scale structure such as Launch vehicles, Mega structures, etc., under various vibration load cases by utilizing precise scaled-down model of that dynamic structure. In order to establish an analytical correlation between the original structure and its scaled models, different scale models of isotropic cantilever beam are selected and analyzed under various vibration conditions（ i.e. free, harmonic and random） using finite element package ANSYS. The developed correlations are also validated through experimental testing The prediction made from the vibratory response of the scaled-down beam through the established sets of correlation are found similar to the response measured from the testing of original beam structure. The established correlations are equally applicable in the prediction of dynamic characteristics of any complex structure through its scaled-down models. This paper presents modified sub-scale modeling technique that enables accurate prediction of vibration characteristics of large and complex structure under not only sinusoidal but also for random vibrations.

关键词： sub-scale modeling resonance frequency vibration characteristics scale factors power spectral density

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