波纹度同轴承振动关系的试验研究     

邓祥明  陈学英 《五邑大学学报(社会科学版)》1992,(3)

本文以D80029型轴承为研究对象,应用逐步回归方法,对内圈沟道波纹度同轴承振动的关系进行了试验研究和统计分析。在此基础上得出了具有一定理论和实践意义的几点结论。  相似文献   

空压机启动故障的分析与处理     

都基海  李跃 《辽宁科技学院学报》2015,(3):36-38

通过对英格索兰C55MX3空压机检修后启动振值高跳脱原因分析,排除机械传动和安装工艺因素影响,最后确诊为电气系统老化接触器开路时闪弧形成的强磁干扰造成空压机数据监测值漂移振值高跳脱。对老化的电气元件进行更换后排除了空压机启动跳脱故障,保证空压机的试车成功。  相似文献   

弹簧和振动物体质量对弹簧振动周期的影响     

李宗领  张辉  李耀宗  张晓娣 《咸阳师范学院学报》2003,18(4):19-21

从理论上分析了柱形弹簧振动系统的振动情况，并给出了柱形、锥形弹簧振动系统振动周期相对于弹簧质量、振动物体质量的实验结果。  相似文献   

Influence of surface treatments on fatigue life of a two-stroke free piston linear engine component using random loading     

RAHMAN M.M ARIFFIN A.K. JAMALUDIN N HARON C.H.C. 《浙江大学学报(A卷英文版)》2006,7(11):1819-1830

INTRODUCTION Fatigue durability has long been important issues in the design of a two-stroke free piston linear engine structure (Torres and Voorwald, 2002; Rahman et al., 2005a; 2005b). Durability assessment is traditionally done in the later part of the product development stage when prototypes are available, and heavily re- lied on in confirming ground durability tests. This process is very time consuming and often results in over-design with weight penalties, which is the major obsta…  相似文献   

Parametrically excited oscillation of stay cable and its control in cable-stayed bridges     

孙炳楠  汪至刚  高赞明  倪一清 《浙江大学学报(A卷英文版)》2003,4(1):13-20

This paper presents a nonlinear dynamic model for simulation and analysis of a kind of parametrically excited vibration of stay cable caused by support motion in cable-stayed bridges. The sag, inclination angle of the stay cable are considered in the model, based on which, the oscillation mechanism and dynamic response characteristics of this kind of vibration are analyzed through numerical, calculation. It is noted that parametrically excited oscillation of a stay cable with certain, sag, inclination angle and initial static tension force may occur in cable-stayed bridges due to deck vibration under the condition that the natural frequency of a cable approaches to about half of the, first model frequency of the bridge deck system. A new vibration control system installed on the cable anchorage is proposed as a possible damping system to suppress, the cable parametric oscillation. The numerical calculation results showed that with the use of this damping system, the cable oscillation due to the vibration of the deck and/or towers will be considerably reduced. Project supported by National Natural Science Foundation of China (No. 59978044)  相似文献   

管线振动的计算分析     

宣征南  韩建宇 《茂名学院学报》1997,(1)

该文根据连续体振动理论,对某二氧化碳吸收管线的振动问题进行了深入的分析。通过实地测量建立管线的计算模型,算出管线现有约束情况下的固有频率和振型。同时,模拟若干种不同的约束条件进行计算,最终找出了解决管线振动的根本方法。  相似文献   

Method of analyzing vibration characteristics of armature system of hermetically sealed electromagnetic relay     

REN Wan-bin CUI Li LUO Fu-biao ZHAI Guo-fu 《浙江大学学报(A卷英文版)》2007,8(3):434-438

Published research is minimal on vibration characteristics of hermetically sealed electromagnetic relay (EMR) ex- posed to mechanical environment. The vibration characteristics of armature system, link contact system with electromagnetic system will cause EMR malfunction. The nonlinear dynamics model of armature systems was studied by considering electro- magnetic attraction force and opposite mechanical force in this paper. Angular displacements of armature under different sinu- soidal vibration conditions are solved in order to obtain the failure mode result from armature system. Vibration tests showed the presented analyzing method is suitable for EMR. The conclusions are instructive for increasing vibration resistance of armature systems of EMR, and are significant for reliability design of switch apparatus.  相似文献   

振膜阻尼式料位器的原理及应用     

Liu Hengdong Wang Yiliang 《大连大学学报》1991,(4)

本文所述的料位器是利用振动阻尼的原理研制的。其外形为圆柱形,它是由振动膜(用金属薄板制作)、驱动器(也是换能器)、电子电路等组成。其特点是:感应面(振动膜)是一个与外壳镶为一体的金属平面。安装使用时即可探入设备内部,也可与设备内壁成一平面,不受湿度、粉尘、污物的影响。经特殊加工可应用于特殊环境,检测不同物料的定点位置。通过在大连第一和第三粮库的烘干塔上使用表明,用振动阻尼的原理制作的料位器,在复杂恶劣的环境中检测粉粒物制的定点位置,性能稳定可非。是现已采用的料位器所不能比拟的。  相似文献   

Track-position and vibration control simulation for strut of the Stewart platform     

Zhao-dong XU  Chen-hui WENG 《浙江大学学报(A卷英文版)》2013,14(4):281-291

Vibrations inherently generated by on-board disturbance sources degrade the performance of the instruments in an on-orbit spacecraft, which have stringent accuracy requirements. The Stewart platform enables both track-positioning and vibration control. The strut of the Stewart platform is designed as a piezoelectric (PZT) element in series with a voice coil motor (VCM) element and a viscoelastic element. The track-positioning system uses a VCM as the main positioning control driver and a PZT as the positioning compensator. The vibration control system uses the characteristics of struts including active and passive control elements to attenuate the vibration. Simulation results indicate that the Stewart platform with the designed struts has good performance in tracking and vibration attenuation with different interference waves.  相似文献   

Fused empirical mode decomposition and wavelets for locating combined damage in a truss-type structure through vibration analysis     

Arturo Garcia-Perez  Juan P. Amezquita-Sanchez  Aurelio Dominguez-Gonzalez  Ramin Sedaghati  Roque Osornio-Rios  Rene J. Romero-Troncoso 《浙江大学学报(A卷英文版)》2013,14(9):615-630

Structural health monitoring （SHM） is a relevant topic for civil systems and involves the monitoring, data processing and interpretation to evaluate the condition of a structure, in order to detect damage. In real structures, two or more sites or types of damage can be present at the same time. It has been shown that one kind of damaged condition can interfere with the detection of another kind of damage, leading to an incorrect assessment about the structure condition. Identifying combined damage on struc- tures still represents a challenge for condition monitoring, because the reliable identification of a combined damaged condition is a difficult task. Thus, this work presents a fusion of methodologies, where a single wavelet-packet and the empirical mode decom- position （EMD） method are combined with artificial neural networks （ANNs） for the automated and online identification-location of single or multiple-combined damage in a scaled model of a five-bay truss-type structure. Results showed that the proposed methodology is very efficient and reliable for identifying and locating the three kinds of damage, as well as their combinations. Therefore, this methodology could be applied to detection-location of damage in real truss-type structures, which would help to improve the characteristics and life span of real structures.  相似文献