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Dynamic characteristics of a magnetorheological pin joint for civil structures

Yancheng LI,Jianchun LI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 1,   Pages 15-33 doi: 10.1007/s11465-014-0283-0

Abstract: test scheme is designed to obtain the dynamic performance of MR pin joint in the dominant earthquake frequencySome unique phenomena different from those of MR damper are observed through the experimental testingA computationally-efficient model is proposed by introducing a hyperbolic element to accurately reproduceComprehensive investigations on the model accuracy and dependences of the proposed model on loading condition(frequency and amplitude) and input current level are reported in the last section of this paper.

Keywords： Magnetorheological pin joint     hyperbolic hysteresis model experimental testing frequency dependence    

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Experimental study on the temperature dependence of ultraviolet absorption cross-sections of sulfur dioxide

ZHANG Shiliang, ZHOU Jie, CHEN Xiaohu

Frontiers in Energy 2008, Volume 2, Issue 2,   Pages 183-186 doi: 10.1007/s11708-008-0025-2

Abstract: The photoabsorption cross-sections of sulfur dioxide were measured in the spectral regions of 200–230 nm and 275–315 nm at 298–415 K, using a grating monochromator with a resolution of 0.2 nm. The discrete absorption cross-section is directly correlated with the number of quantum excited from the base state. The absorption cross-sections at the peaks of discrete bands decreased linearly with the increase of temperature, which corresponded to the decrease in the population of vibrational and rotational transitions from the base level to higher excitation levels. The absorption cross-section peaks decreased linearly when the temperature increased from 298 to 415 K, with relative drops of 74.0% and 75.8% at 200–230 nm and 275–315 nm, respectively. Another distinctive feature of sulfur dioxide absorption spectra in the above two spectral regions was the quasiperiodic structure of the absorption peaks, whose equal wavelength intervals were 1.53 nm and 1.95 nm, respectively. Red and blue shifts were not found at the absorption peak positions.
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Dependence of error sensitivity of frequency on bias voltage in force-balanced micro accelerometer

Lili CHEN, Wu ZHOU

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 2,   Pages 146-149 doi: 10.1007/s11465-013-0260-z

Abstract:

To predict more precisely the frequency of force-balanced micro accelerometer with different biasvoltages, the effects of bias voltages on error sensitivity of frequency is studied.The resonance frequency of accelerometer under closed loop control is derived according to its operationExperimental results indicate that the relative errors between test data and theory data are less thansensitivity with designed parameters of structure, circuit and process error can be used to predict the frequency

Keywords： Micro-Electro-Mechanical Systems (MEMS)     micro accelerometer     force-balanced micro accelerometer     frequency    

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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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Numerical Simulation of the Hyperbolic Mild Slope Equation

Tang Jun,Shen Yongming,Qiu Dahong

Strategic Study of CAE 2007, Volume 9, Issue 4,   Pages 70-74

Abstract:

The hyperbolic mild slope equation has been widely used as an effectivemathematic model to simulate the propagation of water waves in coastal zones.mild slope equation and two examples have been used to validate the numerical model.The numerical results show that the numerical model used in the paper can be effectively used in thenumerical simulation of the hyperbolic mild slope equation.

Keywords： wave model     hyperbolic mild slope equation     numerical simulation    

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Shaking table testing of hard layered soil-pile-structure interaction system

LI Peizhen, REN Hongmei, LU Xilin, SONG Heping, CHEN Yueqing

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 346-352 doi: 10.1007/s11709-007-0046-7

Abstract: The natural frequency of the system was less than that of the structure on rigid foundation if the SSI

Keywords： super-structure     Generally     Magnification     frequency     different    

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Development and testing of a wireless smart toolholder with multi-sensor fusion

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 4, doi: 10.1007/s11465-023-0774-y

Abstract: However, current table and rotational dynamometers for milling force, vibration, and temperature testingThereafter, structural design, circular runout, dynamic balancing, static stiffness, and dynamic inherent frequencyExperimental results demonstrate that the smart toolholder accurately captures machining data with a

Keywords： toolholder     multi-sensor fusion     circular runout     dynamic balancing     static stiffness     dynamic inherent frequency    

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Analysis of the dynamic hysteresis characteristic of finger seal

LEI Yanni, CHEN Guoding

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 32-36 doi: 10.1007/s11465-007-0005-y

Abstract: The research about hysteresis characteristic of finger seal (FS), which was carried out based on themodel with static loads, could not reflect the dynamics behavior of FS system when the rotor runs atA mass spring damper dynamics model of FS system was proposed and the hysteresis characteristic of theThis work shows that the dynamics characteristic analysis of the FS is necessary and the dynamics modelThis dynamics model is the basis for the optimization design of FS system.

Keywords： FS     necessary     hysteresis characteristic     optimization     spring    

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Experimental monitoring of the strengthening construction of a segmental box girder bridge and fieldtesting of external prestressing tendons anchorage

Ali Fadhil NASER, Zonglin WANG

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 3,   Pages 308-320 doi: 10.1007/s11709-012-0140-3

Abstract: measuring the elongation of the external tendons in each level of the tension; and measuring the natural frequencymonitoring process show that the measured values of the deformation, the elongation, and the natural frequency

Keywords： prestressed concrete     box girder     monitoring     external tendons     strain     deflection    

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The Path Dependence of Chinese Corporate Governance——Theoretical and Positive Analysis

Bing Hongyan

Strategic Study of CAE 2004, Volume 6, Issue 2,   Pages 82-87

Abstract:

Building on reviewing the theories of path dependence, this paper analyses the two sources of thepath dependence of corporate governance, i. e.Structure-driven path dependence and rule-driven path dependence,and reveals the effect of the path dependenceanalyses the developing process of Chinese corporate governance, and points out three kinds of path dependence

Keywords： Chinese corporate governance     path dependence     structure-driven path dependence     rule-driven path dependence    

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Model testing of tripod caisson foundations in silty clay subjected to eccentric lateral loads

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 3,   Pages 467-476 doi: 10.1007/s11709-023-0933-6

Abstract: In this study, model tests were conducted to investigate the bearing capacities of tripod caisson foundations

Keywords： tripod caisson foundation     silty clay     eccentric lateral capacity     model tests    

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Ambient vibration testing and updating of the finite element model of a simply supported beam bridge

Ivan Gomez ARAUJO, Esperanza MALDONADO, Gustavo Chio CHO

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3,   Pages 344-354 doi: 10.1007/s11709-011-0124-8

Abstract: ambient vibration test on a concrete bridge constructed in 1971 and calibration of its finite element modelThen, these characteristics were used to update the finite element model of the bridge by formulatingtransverse; and these experimentally obtained dynamic characteristics were also achieved in the analytical modeloptimization techniques showed great versatility to optimize any number and type of variables in the model

Keywords： modal analysis     parameter identification     ambient vibration test     Eigensystem Realization Algorithm (ERA) method     finite element method    

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Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine

Pengxing YI,Peng HUANG,Tielin SHI

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 4,   Pages 388-402 doi: 10.1007/s11465-016-0404-z

Abstract: This paper examines the distinctive modal properties of WTGs through finite element (FE) and experimentalFirst, a whole system model is developed to investigate the first 10 modal frequencies and mode shapesGiven the complex structure and operating conditions of WTG, this study applies spring elements to the modelthe frequency response function method of single point excitation and multi-point response.that the characteristic frequency of the studied gearbox avoids its eigen-frequency very well.

Keywords： wind turbine gearbox     modal analysis     finite element analysis     modal frequency     bearing equivalence    

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Tank-dependence of the functionality and network differentiation of activated sludge community in a full-scale

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 3, doi: 10.1007/s11783-023-1636-x

Abstract:

● Environmental parameters affected functional bacteria and network associations.

Keywords： Activated sludge     Bacterial community     Tank-dependence     Network association     Functional bacteria    

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Development and testing of a weather-based model to determine potential yield losses caused by potato

Alexey FILIPPOV, Maria KUZNETSOVA, Alexander ROGOZHIN, Olga IAKUSHEVA, Valentina DEMIDOVA, Natalia STATSYUK

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 4,   Pages 462-468 doi: 10.15302/J-FASE-2018239

Abstract: Using information about late blight development in an experimental potato field recorded over 30 seasonsdifferences in disease development between these regions and may be used to develop recommendations for a frequency

Keywords： potato     late blight     Phytophthora infestans     yield losses     retrospective analysis     mathematical model    

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Title Author Date Type Operation

Dynamic characteristics of a magnetorheological pin joint for civil structures

Yancheng LI,Jianchun LI

Journal Article

Experimental study on the temperature dependence of ultraviolet absorption cross-sections of sulfur dioxide

ZHANG Shiliang, ZHOU Jie, CHEN Xiaohu

Journal Article

Dependence of error sensitivity of frequency on bias voltage in force-balanced micro accelerometer

Lili CHEN, Wu ZHOU

Journal Article

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

QI Hongyuan, GUAN Yiduo

Journal Article

Numerical Simulation of the Hyperbolic Mild Slope Equation

Tang Jun,Shen Yongming,Qiu Dahong

Journal Article

Shaking table testing of hard layered soil-pile-structure interaction system

LI Peizhen, REN Hongmei, LU Xilin, SONG Heping, CHEN Yueqing

Journal Article

Development and testing of a wireless smart toolholder with multi-sensor fusion

Journal Article

Analysis of the dynamic hysteresis characteristic of finger seal

LEI Yanni, CHEN Guoding

Journal Article

Experimental monitoring of the strengthening construction of a segmental box girder bridge and fieldtesting of external prestressing tendons anchorage

Ali Fadhil NASER, Zonglin WANG

Journal Article

The Path Dependence of Chinese Corporate Governance——Theoretical and Positive Analysis

Bing Hongyan

Journal Article

Model testing of tripod caisson foundations in silty clay subjected to eccentric lateral loads

Journal Article

Ambient vibration testing and updating of the finite element model of a simply supported beam bridge

Ivan Gomez ARAUJO, Esperanza MALDONADO, Gustavo Chio CHO

Journal Article

Numerical analysis and experimental investigation of modal properties for the gearbox in wind turbine

Pengxing YI,Peng HUANG,Tielin SHI

Journal Article

Tank-dependence of the functionality and network differentiation of activated sludge community in a full-scale

Journal Article

Development and testing of a weather-based model to determine potential yield losses caused by potato

Alexey FILIPPOV, Maria KUZNETSOVA, Alexander ROGOZHIN, Olga IAKUSHEVA, Valentina DEMIDOVA, Natalia STATSYUK

Journal Article