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A nonlinear creep model for surrounding rocks of tunnels based on kinetic energy theorem

Journal of Rock Mechanics and Geotechnical Engineering 2023年第2期15卷 363-374页

作者： Wenbo Liu Hui Zhou Shuguang Zhang Shuai Jiang Liu Yang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering Guilin University of TechnologyGuilin541004China School of Civil Engineering Guilin University of TechnologyGuilin541004China

The initiating condition for the accelerated creep of rocks has caused difficulty in analyzing the whole creep ***,the existing Nishihara model has evident shortcomings in describing the accelerated creep characteristics of the viscoplastic stage from the perspective of internal energy to analyze the mechanism of rock creep failure and determine the threshold of accelerated creep *** on the kinetic energy theorem,Perzyna viscoplastic theory,and the Nishihara model,a unified creep constitutive model that can describe the whole process of decaying creep,stable creep,and accelerated creep is *** reveal that the energy consumption and creep damage in the process of creep loading mainly come from the internal energy changes of geotechnical *** established creep model can not only describe the viscoelasticeplastic creep characteristics of rock,but also reflect the relationship between rock energy and creep deformation *** addition,the research results provide a new method for determining the critical point of creep deformation and a new idea for studying the creep model and creep mechanical properties.

关键词： Internal energy kinetic energy theorem Perzyna viscoplastic theory Nishihara model Accelerated creep Initiating threshold

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Bus mass estimation algorithm based on kinetic energy theorem

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Journal of Measurement Science and Instrumentation 2015年第2期6卷 103-110页

作者：张文娟秦静谢辉马红杰黄登高天津大学内燃机燃烧学国家重点实验室天津300072

Bus mass is an important factor that affects fuel consumption and one of the key input parameters associated with automatic shift and hybrid electric vehicle （HEV） energy management strategy. A city bus mass estimation method based on kinetic energy theorem was proposed in this paper. The real-time data including vehicle speed and engine torque were collected by a remote data acquisition system. The samples in the process of being accelerated were selected to conduct vehicle mass estimation at the same bus stop with the same gear. The average estimation error is 2. 92% after the verification by actual data. Compared with the method based on recursive least squares, the algorithm based on kinetic energy theorem requires less sample length and the estimation error is smaller. Therefore, the method is more suitable for the bus mass estimation. The influences of gear, rolling resistance coefficient, wind resistance coefficient and road slope on mass estimation accuracy were analyzed.

关键词： bus mass kinetic energy theorem recursive least squares

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Dynamic Response of Ocean Trestle to Horizontal Impact of Moving Mass

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China Ocean Engineering 2002年第1期17卷 51-60页

作者：陈云甸朱斌陈仁朋 Geotechnical Engineering Institute Zhejiang University

Based on the Winkler hypothesis, a model for analysis of the flexural response of an ocean trestle embedded in layered soil to horizontal impact of a moving mass is developed. By use of the transfer matrix in Lime domain, one can calculate the flexural dynamic response of a single pile. Then, by use of the boundary conditions of piles at the pile top, the dynamic response of the structure is analyzed. By use of the model proposed in this paper, the interactive force between the moving mass and the structure can be computed based on Work's kinetic energy theorem and Newton iterative method. Thus the approach does not have to assume the interactive force, while the traditional method have to. The approach more accords with the engineering practice than the traditional method and it is convenient for engineering design.

关键词： dynamic response ocean structure transfer matrix kinetic energy theorem

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A Combined Numerical-Experimental Study on the Noise Power Spectrum Produced by an Electromagnetic Sensor for Slurry Flow

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Fluid Dynamics & Materials Processing 2021年第3期17卷 511-529页

作者： Song Gao Xin Jin Qiaohong Liu College of Agricultural Equipment Engineering Henan University of Science and TechnologyLuoyang471023China School of Medical Instruments Shanghai University of Medicine and Health SciencesShanghai201318China

The signals generated by electromagnetic flow sensors used for slurry fluids are often affected by noise interference produced by interaction with the slurry *** this study,the power spectrum characteristics of the signal are studied,and an attempt is made to determine the relationship between the characteristics of the related noise and the velocity and concentration of the slurry *** experiments are conducted and the related power spectrum curve is obtained processing the signal measured by the sensor with *** simulations are also carried out in the frame of an Eulerian approach in order get additional insights into the considered problem through comparison with the experimental *** following conclusions are drawn:(1)The intensity of noise is directly proportional to the number of solid particles colliding with the electrode of the electromagnetic flow sensor per unit time,and to the square of the average velocity of the flow layer near the pipe wall.(2)With an increase in the slurry noise intensity,the power spectrum curve shifts upward in the logarithmic coordinate system(and vice versa).

关键词： Electromagnetic flow sensor slurry noise power spectrum kinetic energy theorem

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Research on the Optimal Strategy of"Working Together with One Heart"Project

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Journal of Contemporary Educational Research 2022年第5期6卷 96-101页

作者： Jing Cong Basic Department of Liaoning Institute of Science and Technology Benxi 117000Liaoning ProvinceChina

The"Working Together with One Heart"project,also known as the"One Heart Drum"project,is a collaboration skill development project,which assesses the collaboration skills of its team *** this paper,the method of combining actual problems with physical model analysis is used to determine the influence of different factors in the project operation,and a geometric analysis model is also *** MATLAB simulation and assignment operation,the optimal strategy of the project is finally obtained.

关键词： "Working Together with One Heart"project Conservation of momentum Geometric model kinetic energy theorem

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