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Lateral Vibration Analyses of Flying Vehicle under Thrust and Drag

Song Jian

Strategic Study of CAE 2000, Volume 2, Issue 10,   Pages 63-72

Abstract:

In this paper, the influence of thrust and air drag on rocket lateral vibration is studied, and thefrequency reduction under the thrust and drag is analyzed.The formulas for evaluation of the changes of frequencies and vibration modes are obtained.

Keywords： aircraft     rocket     lateral vibration     thrust and drag     vibration mode and frequency    

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Conformal analysis of fundamental frequency of vibration of elastic clamped plates

QI Hongyuan, ZHU Hengjun

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4,   Pages 429-432 doi: 10.1007/s11465-007-0073-z

Abstract: To calculate the fundamental frequency of vibration of special-shaped and elastic clamped plates, theGalerkin method is used to obtain the solution of fundamental frequency in the vibrating differentialFinally, taking ellipse elastic clamped plates as an example, the effects on fundamental frequency coefficient

Keywords： direction     theory     vibration     odd     complicated boundary    

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Relative vibration identification of cutter and workpiece based on improved bidimensional empirical mode

Jiasheng LI, Xingzhan LI, Wei WEI, Pinkuan LIU

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 2,   Pages 227-239 doi: 10.1007/s11465-020-0587-1

Abstract: In the process of cutting, the relative vibration between the cutter and the workpiece has an importantIn this study, the bidimensional empirical mode decomposition (BEMD) method is used to identify suchThe characteristic surface topography representing the relative vibration between the cutter and theThe decimal part of the frequency ratio that has an important effect on the shape of the contour cansurface morphology demonstrate the validity of the improved BEMD algorithm in realizing the relative vibration

Keywords： bidimensional empirical mode decomposition     spatial spectrum analysis     boundary effect     vibration identification    

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Frequency domain a9ctive vibration control of a flexible plate based on neural networks

Jinxin LIU, Xuefeng CHEN, Zhengjia HE

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 2,   Pages 109-117 doi: 10.1007/s11465-013-0252-z

Abstract:

A neural-network (NN)-based active control system was proposed to reduce the low frequency noise radiationMulti-frequency control in frequency domain was achieved by simulation through the NN-based control systemsThese works lay a solid foundation for the active vibration control of mechanical structures.

Keywords： active vibration control (AVC)     neural network (NN)     low frequency noise     frequency domain control     multi-frequency    

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Prediction of characteristic blast-induced vibration frequency during underground excavation by using

Tae Un PAK; Guk Rae JO; Un Chol HAN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 8,   Pages 1029-1039 doi: 10.1007/s11709-022-0861-x

Abstract: changes of blasting vibration parameters such as vibration velocity and energy in different frequencyFrom analysis of results, it can be found that peak velocity and energy of blasting vibration in frequencyfrequency.Most frequency bands were affected by blasting source distance, and the frequency band of 0–62.5 Hz reflectedBy presenting a simplified method to predict main vibration frequency, this research may provide significant

Keywords： wavelet analysis     blast-induced vibration     frequency characteristics     underground excavation    

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Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 173-179 doi: 10.1007/s11709-009-0034-1

Abstract: are essential for flutter analysis of long-span bridges, and they are generally identified from the vibrationMaking use of the forced vibration testing data of three sectional models, namely, a thin-plate modelIt was shown that all the flutter derivatives of the thin-plate model identified with the frequency-domainMore precisely, the frequency-domain method usually results in smooth curves of the flutter derivativesidentification results of flutter derivatives relatively sensitive to the signal phase lag between vibration

Keywords： long-span bridges     wind-induced vibration     flutter derivatives     forced vibration test     time-domain method     frequency-domain method    

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A frequency error estimation for isogeometric analysis of Kirchhoff–Love cylindrical shells

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0006-x

Abstract: A frequency error estimation is presented for the isogeometric free vibration analysis of Kirchhoff–LoveBy analyzing the discrete isogeometric equations with the aid of harmonic wave assumption, the frequencyis naturally embedded into the frequency error measures without the need of explicit frequency expressionsNumerical results not only thoroughly verify the theoretical convergence rates of frequency solutionsthe isogeometric free vibration analysis of Kirchhoff–Love cylindrical shells.

Keywords： isogeometric analysis     Kirchhoff–Love cylindrical shell     free vibration     frequency error     convergence    

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Multi-harmonic forced vibration and resonance of simple beams to moving vehicles

Frontiers of Structural and Civil Engineering   Pages 981-993 doi: 10.1007/s11709-023-0979-5

Abstract: modeled the moving-vehicle-induced forcing excitation on a single-span prismatic bridge as a multiple frequency-multiplicationThe forced modal responses consist of multiple frequency-multiplication steady-state harmonics and onedamped mono-frequency complementary harmonic.The forced resonance amplification characteristics of the fundamental mode for beam response estimationsingle-span simple beams, the moving vehicle carriage heaving oscillation modulates the beam modal frequency

Keywords： forced vibration     linear Euler beam     moving load     harmonic structure     frequency modulation     end restraints    

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Design of ultrasonic elliptical vibration cutting system for tungsten heavy alloy

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0715-1

Abstract: In this study, a high-performance ultrasonic elliptical vibration cutting (UEVC) system is developedworking principle of piezoelectric transducers on the ultrasonic vibrator using the fifth resonant modeof bending are analyzed to realize the dual-bending vibration modes.vibration locus, which is verified by finite element method.the UEVC system present the resonant frequency of 41 kHz and the maximum amplitude of 14.2 μm.

Keywords： tungsten heavy alloy     ultrasonic elliptical vibration cutting     Timoshenko’s theory     resonant mode of    

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Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremelynoisy ambient vibration tests in Shiraz-Iran

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 446-472 doi: 10.1007/s11709-019-0605-8

Abstract: The main purpose of the present study is to enhance high-level noisy data by a wavelet-based iterative filtering algorithm for identification of natural frequencies during ambient wind vibrational tests on a petrochemical process tower. Most of denoising methods fail to filter such noise properly. Both the signal-to-noise ratio and the peak signal-to-noise ratio are small. Multiresolution-based one-step and variational-based filtering methods fail to denoise properly with thresholds obtained by theoretical or empirical method. Due to the fact that it is impossible to completely denoise such high-level noisy data, the enhancing approach is used to improve the data quality, which is the main novelty from the application point of view here. For this iterative method, a simple computational approach is proposed to estimate the dynamic threshold values. Hence, different thresholds can be obtained for different recorded signals in one ambient test. This is in contrast to commonly used approaches recommending one global threshold estimated mainly by an empirical method. After the enhancements, modal frequencies are directly detected by the cross wavelet transform (XWT), the spectral power density and autocorrelation of wavelet coefficients. Estimated frequencies are then compared with those of an undamaged-model, simulated by the finite element method.

Keywords： ambient vibration test     high level noise     iterative signal enhancement     wavelet     cross and autocorrelation    

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Control of wind-induced vibration of long-span bridges and tall buildings

GU Ming

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 1,   Pages 51-62 doi: 10.1007/s11709-007-0005-3

Abstract: With the rapid increase in scales of structures, research on controlling wind-induced vibration of large-scaleFor wind-induced vibration of large-scale structures, vibration frequencies and damping modes vary withA new semiactive lever-type tuned mass damper (TMD) with an adjustable frequency is proposed to controlThe results demonstrate that the proposed strategies can reduce vibration effectively, and can adaptto wind-induced vibration control of large-scale structures in the uncertain dynamic circumstance.

Keywords： torsional buffeting     large-scale     semiactive     adjustable frequency     building aeroelastic    

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Fundamental frequency and testing mode of complicated elastic clamped-plate vibration

QI Hongyuan, GUAN Yiduo

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 360-364 doi: 10.1007/s11465-008-0084-4

Abstract: set up the mapping function between a complicated region and a unit dish region, and the fundamental frequencyTaking an elastic rectangle-plate with arc radius as an example, the testing mode frequency band of platesis determined by analyzing the fundamental frequency; meanwhile, according to hamming testing methodComparing the first order modal frequency with the theoretical fundament frequency, the validity of thetesting mode method and theoretical analysis are verified.

Keywords： multi-point excitation     rectangle-plate     single-point     processing technology     trigonometric interpolation    

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Evaluation of transmissibility for a class of nonlinear passive vibration isolators

Z. K. PENG, Z. Q. LANG, G. MENG

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 4,   Pages 401-409 doi: 10.1007/s11465-012-0349-9

Abstract:

In this study, the concept of Output Frequency Response Functions (OFRFs) is applied to representthe transmissibility of nonlinear isolators in frequency domain.characteristic parameters might affect the force and displacement transmissibility is built for the vibrationoutputs of the nonlinear isolators, and the introduction of a nonlinear anti-symmetric damping into vibrationThese conclusions are of significant importance in the analysis and design of the nonlinear vibration

Keywords： nonlinear vibration     volterra series     Output Frequency Response Functions (OFRFs)     nonlinear damping     vibration    

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A preliminary research on wireless cantilever beam vibration sensor in bridge health monitoring

Xinlong TONG, Shanglin SONG, Linbing WANG, Hailu YANG

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 2,   Pages 207-214 doi: 10.1007/s11709-017-0406-x

Abstract: Considering natural frequency of vibration and intensity of the beam body, design a new type of piezoelectricand data collection card, experimental verification of the radio piezoelectric vibrating cantilever vibrationresponse is intact, the beam produced signal by vibration, acquisition card converts and wireless transmitdata, this proved a good and intuitive linear response in simulation of bridge vibration test.Finally, the paper designed a kind of new wireless sensor of vibration cantilever beam, suitable for

Keywords： piezoelectric cantilever beam     bridge     natural frequency     wireless sensor    

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Computation and investigation of mode characteristics in nonlinear system with tuned/mistuned contact

Houxin SHE, Chaofeng LI, Qiansheng TANG, Hui MA, Bangchun WEN

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 1,   Pages 133-150 doi: 10.1007/s11465-019-0557-7

Abstract: system with multiple friction contact interfaces that is well-suited to the investigation of nonlinear moderebuild the matrices of the coupling system, which can be easily solved to calculate the nonlinear modeMoreover, this study analyzed the effects of the tuned and mistuned contact features on the nonlinear mode

Keywords： coupling vibration     nonlinear mode     original algorithm     contact interface    

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Title Author Date Type Operation

Lateral Vibration Analyses of Flying Vehicle under Thrust and Drag

Song Jian

Journal Article

Conformal analysis of fundamental frequency of vibration of elastic clamped plates

QI Hongyuan, ZHU Hengjun

Journal Article

Relative vibration identification of cutter and workpiece based on improved bidimensional empirical mode

Jiasheng LI, Xingzhan LI, Wei WEI, Pinkuan LIU

Journal Article

Frequency domain a9ctive vibration control of a flexible plate based on neural networks

Jinxin LIU, Xuefeng CHEN, Zhengjia HE

Journal Article

Prediction of characteristic blast-induced vibration frequency during underground excavation by using

Tae Un PAK; Guk Rae JO; Un Chol HAN

Journal Article

Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Journal Article

A frequency error estimation for isogeometric analysis of Kirchhoff–Love cylindrical shells

Journal Article

Multi-harmonic forced vibration and resonance of simple beams to moving vehicles

Journal Article

Design of ultrasonic elliptical vibration cutting system for tungsten heavy alloy

Journal Article

Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremelynoisy ambient vibration tests in Shiraz-Iran

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI

Journal Article

Control of wind-induced vibration of long-span bridges and tall buildings

GU Ming

Journal Article

Fundamental frequency and testing mode of complicated elastic clamped-plate vibration

QI Hongyuan, GUAN Yiduo

Journal Article

Evaluation of transmissibility for a class of nonlinear passive vibration isolators

Z. K. PENG, Z. Q. LANG, G. MENG

Journal Article

A preliminary research on wireless cantilever beam vibration sensor in bridge health monitoring

Xinlong TONG, Shanglin SONG, Linbing WANG, Hailu YANG

Journal Article

Computation and investigation of mode characteristics in nonlinear system with tuned/mistuned contact

Houxin SHE, Chaofeng LI, Qiansheng TANG, Hui MA, Bangchun WEN

Journal Article