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螺杆泵杆柱系统自振频率分析 被引量:3
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作者 卢怀宝 王忠德 张文飞 《油气田地面工程》 1997年第6期67-69,共3页
根据螺杆泵杆柱系统的结构与力学特点,应用动力学中的有限元法对螺杆泵杆柱的系统自振频率进行了分析和计算。文中详细叙述了该问题的力学及数学模型、边界条件的处理、数值求解方法等,并给出了实际应用的数值算例。该方法可直接用于... 根据螺杆泵杆柱系统的结构与力学特点,应用动力学中的有限元法对螺杆泵杆柱的系统自振频率进行了分析和计算。文中详细叙述了该问题的力学及数学模型、边界条件的处理、数值求解方法等,并给出了实际应用的数值算例。该方法可直接用于解决螺杆泵杆柱系统的共振频率分析问题。 展开更多
关键词 螺杆泵 抽油杆 自振频率分析 杆柱系统
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功率超声珩磨声振子系统的计算机仿真
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作者 高艳霞 祝锡晶 陆志猛 《新技术新工艺》 2007年第12期7-9,共3页
在功率超声珩磨加工装置的设计中,由于其声振子系统的自振频率很难用常规的计算方法准确判断,这给装置的设计实验和投入生产带来了很大的不便。本文通过计算机仿真技术对中北大学自行设计的Φ150mm立式珩磨装置的声振子系统进行自振频... 在功率超声珩磨加工装置的设计中,由于其声振子系统的自振频率很难用常规的计算方法准确判断,这给装置的设计实验和投入生产带来了很大的不便。本文通过计算机仿真技术对中北大学自行设计的Φ150mm立式珩磨装置的声振子系统进行自振频率分析和相应振型的数值模拟,取得了很好的成果。文中建立了相应的声振子系统的数学模型,完成了声振子系统自振频率分析和相应振型的数值模拟,并对其进行了动力响应分析,解决了超声珩磨加工装置设计中响应的难题。 展开更多
关键词 功率超声珩磨 子系统 计算机仿真 自振频率分析 动力响应分析
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Modal analysis on transverse vibration of axially moving roller chain coupled with lumped mass 被引量:4
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作者 许立新 杨玉虎 +1 位作者 常宗瑜 刘建平 《Journal of Central South University》 SCIE EI CAS 2011年第1期108-115,共8页
The modal characteristics of the transverse vibration of an axially moving roller chain coupled with lumped mass were analyzed.The chain system was modeled by using the multi-body dynamics theory and the governing equ... The modal characteristics of the transverse vibration of an axially moving roller chain coupled with lumped mass were analyzed.The chain system was modeled by using the multi-body dynamics theory and the governing equations were derived by means of Lagrange's equations.The effects of the parameters,such as the axially moving velocity of the chain,the tension force,the weight of lumped mass and its time-variable assign position in chain span,on the modal characteristics of transverse vibration for roller chain were investigated.The numerical examples were given.It is found that the natural frequencies and the corresponding mode shapes of the transverse vibration for roller chain coupled with lumped mass change significantly when the variations of above parameters are considered.With the movement of the chain strand,the natural frequencies present a fluctuating phenomenon,which is different from the uniform chain.The higher the order of mode is,the greater the fluctuating magnitude and frequency are. 展开更多
关键词 roller chain modal analysis transverse vibration lumped mass
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Theoretical Explanation for Lower Order Harmonic Resonance Phenomenon of Three-Ring Gear Transmissions 被引量:2
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作者 杨建明 张策 +1 位作者 林忠钦 陈关龙 《Journal of Shanghai Jiaotong university(Science)》 EI 2003年第1期71-74,共4页
Dynamic investigations revealed that lower order harmonic resonance phenomenon exists in the three ring gear transmission. That is, when the input speed is close to 1/3, 1/6, 1/9,…, 1/3 n of the primary natural frequ... Dynamic investigations revealed that lower order harmonic resonance phenomenon exists in the three ring gear transmission. That is, when the input speed is close to 1/3, 1/6, 1/9,…, 1/3 n of the primary natural frequency of the transmission, the loads on the bearings and gears are especially high. This paper explained this phenomenon from the viewpoint of parametric resonance in terms of perturbation technique. A conclusion was drawn that the basic reason for this phenomenon is the primary resonance caused by forcing excitation and parametric resonance caused by parametric change. 展开更多
关键词 three ring gear transmission lower order resonance phenomenon natural frequency primary resonance parametric resonance
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Dynamic Properties of Long Large Cross-section Underground Structures in Dynamic Seismic Analysis
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作者 Chen Canshou Qi Chengzhi +2 位作者 Yang Xiuren Chen Guoxing Chen Jianjie 《Earthquake Research in China》 2011年第3期330-339,共10页
Seismic safety of underground structures is one of the main concerns in underground space exploitation. As the first step for dynamic seismic response analysis, the free vibration of long large cross-section undergrou... Seismic safety of underground structures is one of the main concerns in underground space exploitation. As the first step for dynamic seismic response analysis, the free vibration of long large cross-section underground structures is studied in the present paper. The general free transverse vibration motion equation of long large cross-section underground structure is derived with the comprehensive consideration of internal and external damping, effects of shear, cross-sectional rotational inertia and axial force, and a twoparameter soil model. In this way, Timoshenko's beam theory is extended. Two limit cases of free transverse vibration of underground structures are discussed. Parameter study shows that in general wave propagation velocities in structures increase with soil elastic parameters. However the influence of Winkler's parameter k is significant while the effect of the second soil elastic parameter gp is insignificant. The free vibration frequency of underground structures increases with relative wave number and soil elastic parameters. Unlike the influence of soil elastic parameters on wave propagation velocities, the influence of soil elastic parameters k and gp on the vibration frequency of underground structures have the same order; therefore the influence of the second soil parameter gp on the free vibration of underground structures should not be neglected in dynamic seismic analysis of underground structures 展开更多
关键词 Seismic safety Underground structure Free vibration Two-parameter soilmodel
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