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300t研配试冲压机动梁结构优化设计
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作者 田方 陶柯 刘丽颖 《沈阳工业大学学报》 CAS 1995年第3期44-47,共4页
运用SAP5程序对该动梁结构进行了分析,提出了适合该梁的力学模型,在保证原动梁外形不变、重量不增加等条件下,采用优化方法追求其刚度最大,对其结构进行了优化设计.并得到SAP5程序的计算验证.
关键词 冲压机 动梁结构 优化设计
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Finite element analysis of dynamic stability of skeletal structures under periodic loading 被引量:4
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作者 THANA Hemantha Kumar AMEEN Mohammed 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第2期245-256,共12页
This paper addresses the dynamic stability problem of columns and frames subjected to axially applied periodic loads. Such a structure can become unstable under certain combinations of amplitudes and frequencies of th... This paper addresses the dynamic stability problem of columns and frames subjected to axially applied periodic loads. Such a structure can become unstable under certain combinations of amplitudes and frequencies of the imposed load acting on its columns/beams. These are usually shown in the form of plots which describe regions of instability. The finite element method (FEM) is used in this work to analyse dynamic stability problems of columns. Two-noded beam elements are used for this purpose. The periodic loading is decomposed into various harmonics using Fourier series expansion. Computer codes in C++ using object oriented concepts are developed to determine the stability regions of columns subjected to periodic loading. A number of nu-merical examples are presented to illustrate the working of the program. The direct integration of the equations of motions of the discretised system is carried out using Newmark’s method to verify the results. 展开更多
关键词 Finite element analysis Dynamic stability Mathieu-Hill equation
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Improvement for design of beam structures in large vibrating screen considering bending and random vibration 被引量:7
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作者 彭利平 刘初升 +2 位作者 宋宝成 武继达 王帅 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第9期3380-3388,共9页
Demand for large vibrating screen is huge in the mineral processing industry. As bending and random vibration are not considered in a traditional design method for beam structures of a large vibrating screen, fatigue ... Demand for large vibrating screen is huge in the mineral processing industry. As bending and random vibration are not considered in a traditional design method for beam structures of a large vibrating screen, fatigue damage occurs frequently to affect the screening performance. This work aims to conduct a systematic mechanics analysis of the beam structures and improve the design method. Total motion of a beam structure in screening process can be decomposed into the traditional followed rigid translation(FRT), bending vibration(BV) and axial linear-distributed random rigid translation(ALRRT) excited by the side-plates. When treated as a generalized single-degree-of-freedom(SDOF) elastic system analytically, the BV can be solved by the Rayleigh's method. Stochastic analysis for random process is conducted for the detailed ALRRT calculation. Expressions for the mechanics property, namely, the shearing force and bending-moment with respect to BV and ALRRT, are derived, respectively. Experimental and numerical investigations demonstrate that the largest BV exists at the beam center and can be nearly ignored in comparison with the FRT during a simplified engineering design. With the BV and FRT considered, the mechanics property accords well with the practical situation with the maximum error of 6.33%, which is less than that obtained by traditional method. 展开更多
关键词 large vibrating screen BEAM bending vibration random vibration mechanics analysis
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Structural safety monitoring for Nanjing Yangtze River Bridge 被引量:6
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作者 黄方林 何旭辉 +1 位作者 陈政清 曾储惠 《Journal of Central South University of Technology》 EI 2004年第3期332-335,共4页
In order to evaluate objectively and accurately the integrity, safety and operating conditions in real time for the Nanjing Yangtze River Bridge, a large structural safety monitoring system was described. The monitori... In order to evaluate objectively and accurately the integrity, safety and operating conditions in real time for the Nanjing Yangtze River Bridge, a large structural safety monitoring system was described. The monitoring system is composed of three parts: sensor system, signal sampling and processing system, and safety monitoring and assessment system. Combining theoretical analysis with measured data analysis, main monitoring contents and layout of measuring points were determined. The vibration response monitoring was significantly investigated. The main contents of safety monitoring on vibration response monitoring are vibration of the main body of the Nanjing Yangtze river bridge, collision avoidance of the bridge piers, vibration of girders on high piers for the bridge approach and earthquake. As a field laboratory, the safety monitorying system also provides information to investigate the unknown and indeterminate problems on bridge structures and specific environment around bridges. 展开更多
关键词 structural safety monitoring Nanjing Yangtze river bridge safety monitoring system vibration (response)
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Semi-active Control with Variable Damper for Pier-Beam Transversal Vibration
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作者 Jianguo Xu Xiang Liu +1 位作者 Bo Wang Huai Chen 《Journal of Civil Engineering and Architecture》 2010年第2期41-46,共6页
In this paper, the method of semi-active control with variable damper is presented to deal with the relatively poor transversal seismic condition of bridge. Based on the LQR control algorithm the control effectiveness... In this paper, the method of semi-active control with variable damper is presented to deal with the relatively poor transversal seismic condition of bridge. Based on the LQR control algorithm the control effectiveness for transverse vibration of pier-beam structure of bridge are discussed. Taking the structure as a multiple-degree of freedom system, the calculating model of structure-variable damper system is set up and the differential equation is derived, combined with practical example the control system is simulated and studied by various semi-active control algorithms and passive strategy with MATLAB. The results show that the semi-active control with variable damper can decrease the transverse vibration effectively and the control effect is obvious. 展开更多
关键词 Pier-beam structure of bridge vibration control transverse vibration variable damper control semi-active control algorithms LQR algorithm.
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A Method to Improve First Order Approximation of Smoothed Particle Hydrodynamics
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作者 陈思 周岱 +1 位作者 包艳 董石麟 《Journal of Shanghai Jiaotong university(Science)》 EI 2008年第2期136-138,共3页
Smoothed particle hydrodynamics (SPH) is a useful meshless method.The first and second orders are the most popular derivatives of the field function in the mechanical governing equations.New methods were proposed to i... Smoothed particle hydrodynamics (SPH) is a useful meshless method.The first and second orders are the most popular derivatives of the field function in the mechanical governing equations.New methods were proposed to improve accuracy of SPH approximation by the lemma proved.The lemma describes the relationship of functions and their SPH approximation.Finally,the error comparison of SPH method with or without our improvement was carried out. 展开更多
关键词 smoothed particle hydrodynamics first order derivatives ACCURACY error comparison
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Etched Optical Fiber Vibration Sensor to Monitor Health Condition of Beam Like Structures 被引量:2
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作者 Kishore PUTHA Dinakar DANTALA Srimannarayana KAMINENI Vengal Rao PACHAVA 《Photonic Sensors》 SCIE EI CAS 2013年第2期124-130,共7页
Using a center etched single mode optical fiber, a simple vibration senor is designed to monitor the vibrations of a simply supported beam. The sensor has high linear response to the axial displacement of about 0.8mm ... Using a center etched single mode optical fiber, a simple vibration senor is designed to monitor the vibrations of a simply supported beam. The sensor has high linear response to the axial displacement of about 0.8mm with a sensitivity of 32mV/10p, m strain. The sensor is tested for periodic and suddenly released forces, and the results are found to coincide with the theoretical values. This simple design, small in size and low cost sensor may find applications in industry and civil engineering to monitor the vibrations of the beam structures and bridges. 展开更多
关键词 Optical fiber etched fiber simply supported beam vibration sensor health condition monitoring
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