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光盘轴向机械动态特性测量方法的研究 被引量:1
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作者 裴先登 王海卫 谢长生 《仪器仪表学报》 EI CAS CSCD 北大核心 2003年第4期406-409,共4页
研究了光盘轴向机械动态特性和聚焦伺服系统的关系 ,系统研究了影响光盘轴向偏摆各分量对总偏摆的影响 ,据此建立光盘轴向偏摆的数学模型。根据该模型 ,分析了几种有代表性的测量方法的优缺点并重点研究了它们各自的测量精度 ,提出了一... 研究了光盘轴向机械动态特性和聚焦伺服系统的关系 ,系统研究了影响光盘轴向偏摆各分量对总偏摆的影响 ,据此建立光盘轴向偏摆的数学模型。根据该模型 ,分析了几种有代表性的测量方法的优缺点并重点研究了它们各自的测量精度 ,提出了一种全新的基于激光三角法的测量方法。 展开更多
关键词 光盘 轴向机械动态特性 测量方法 聚焦伺服系统 轴向偏摆 数学模型 激光三角法
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光盘轴向机械动态特性的计算机自动测试系统
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作者 裴先登 王海卫 谢长生 《小型微型计算机系统》 CSCD 北大核心 2002年第12期1522-1525,共4页
光盘系统的开发者和光盘介质的提供者需要一种能自动、方便测量光盘轴向机械动态特性的测试系统 .本文系统介绍了一种新型、基于激光三角法的、适用于自动化生产线的光盘机械动态特性计算机自动测试系统 .系统构成框图。
关键词 光盘 轴向机械动态特性 计算机 自动测试系统 光盘驱动器
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消防梯升降机构的运动学和动力学参数求解与仿真 被引量:2
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作者 周明健 王玉勤 沈银杰 《蚌埠学院学报》 2018年第5期23-27,32,共6页
分析了消防梯升降机构在消防救援工程车中的广泛应用,消防升降机构中液压缸的油压、流量、行程等相关参数设计是否合理直接影响着消防梯升降机构的工作状况。针对消防梯升降机构的相关设计参数不精确而造成其机械动态特性不稳定的情况,... 分析了消防梯升降机构在消防救援工程车中的广泛应用,消防升降机构中液压缸的油压、流量、行程等相关参数设计是否合理直接影响着消防梯升降机构的工作状况。针对消防梯升降机构的相关设计参数不精确而造成其机械动态特性不稳定的情况,建立RPRⅡ级机构模型求解消防梯升降机构的运动学参数和动力学参数。以某一型号消防梯升降机构为例,运用MATLAB仿真出消防梯升降机构工作时液压缸的运动学和动力学图,获得液压缸的无杆腔内实时压强和实时流量参数,为消防梯升降机构具有良好的机械动态特性奠定基础。 展开更多
关键词 消防梯升降机构 运动学参数 动力学参数 机械动态特性
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变幅机构的运动学和动力学参数求解与仿真 被引量:1
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作者 周明健 王玉勤 朱伟平 《新乡学院学报》 2017年第6期56-60,共5页
变幅机构广泛应用于工程机械中,变幅机构中变幅油缸的机械动态特性直接影响着变幅机构的工作状况。针对因变幅机构的相关设计参数不精确而造成变幅机构机械动态特性不稳定的情况,采用导杆机构模型逆向求解变幅机构的运动学参数和动力学... 变幅机构广泛应用于工程机械中,变幅机构中变幅油缸的机械动态特性直接影响着变幅机构的工作状况。针对因变幅机构的相关设计参数不精确而造成变幅机构机械动态特性不稳定的情况,采用导杆机构模型逆向求解变幅机构的运动学参数和动力学参数。以某一型号变幅机构为例,运用MATLAB仿真出变幅机构工作时变幅油缸运动学和动力学图,获得变幅油缸无杆腔内实时压强和实时流量参数,便于变幅机构的设计与控制,为变幅机构具有良好的机械动态特性奠定基础。 展开更多
关键词 变幅机构 运动学参数 动力学参数 机械动态特性
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传递矩阵建模法在轴横向振动分析中的应用 被引量:1
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作者 李芸 《机械研究与应用》 2005年第4期84-85,共2页
介绍用传递矩阵法进行机械动态分析的思路,通过实例探索在机械动态分析设计中,轴横向振动固有频率的计算方法。
关键词 机械动态特性 传递矩阵 力学模型 横向振动 固有频率
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Investigation of Structural System Safety
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作者 Cemal Eyyubov Mehmet Hasnalbant Isa Eyyubov 《Journal of Civil Engineering and Architecture》 2018年第8期586-604,共19页
In order to investigate the behavior of buildings and engineering structures during earthquakes, based on the data of seismic observation devices mounted on constructions with typical characteristics, results of inves... In order to investigate the behavior of buildings and engineering structures during earthquakes, based on the data of seismic observation devices mounted on constructions with typical characteristics, results of investigating the change of mechanical properties of building structural system over time and the results of examination of structural rigidity and safety change over time, depending on the dynamic characteristics of the building, determined by experimental investigations made at intervals are mentioned in this article. In addition, evaluation of earthquake acceleration acting on structures due to earthquake-induced damage characteristics of buildings and engineering constructions which are made earthquake resistant is also included here. 展开更多
关键词 Earthquake intensity macro seismic investigation structural system safety RIGIDITY ground acceleration.
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Experimental investigation on dynamic mechanical characteristics and microstructure of steam-cured concrete 被引量:5
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作者 LONG GuangCheng WANG Meng +1 位作者 XIE YouJun MA KunLin 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第10期1902-1908,共7页
Steam-cured concrete is widely used to manufacture prefabricated units of high-speed railway foundation structure such as girder and track slab.The dynamic mechanical property of steam-cured concrete is one of the key... Steam-cured concrete is widely used to manufacture prefabricated units of high-speed railway foundation structure such as girder and track slab.The dynamic mechanical property of steam-cured concrete is one of the key properties affecting service performance of high-speed railway foundation structure.In the present paper,serial macro/micro-experiments were carried out to investigate the dynamic elastic modulus,shear modulus,damping ratio,and microstructure of steam-cured concrete.The relationships between compositions,curing regime,microstructure,and dynamic properties of steam-cured concrete as well as the corresponding mechanisms were discussed.The results indicate that steam-cured concrete in early age has a larger dynamic elastic modulus and shear modulus as well as a smaller damping ratio compared with standard-cured concrete.On the contrary,at a later age a slightly smaller dynamic elastic modulus and a larger damping ratio of steam-cured concrete are observed.Addition of mineral admixture results in a bit lower dynamic elastic modulus and damping ratio of concrete than that of the control specimen without mineral admixtures.The achievements can provide some fundamental suggestions for materials parameters selection during structural design of steam-cured concrete precast element. 展开更多
关键词 steam-cured concrete dynamic elastic modulus shear modulus damping ratio MICROSTRUCTURE
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Dynamic Characteristics of Hydrocarbon Fuel within the Channel at Supercrit- ical and Pyrolysis Condition 被引量:1
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作者 YU Bin ZHOU Weixing +1 位作者 QIN Jiang BAO Wen 《Journal of Thermal Science》 SCIE EI CAS CSCD 2017年第6期560-569,共10页
Regenerative cooling with fuel as the coolant is used in the scramjet engine. In order to grasp the dynamic cha- racteristics of engine fuel supply processes, this article studies the dynamic characteristics of hydroc... Regenerative cooling with fuel as the coolant is used in the scramjet engine. In order to grasp the dynamic cha- racteristics of engine fuel supply processes, this article studies the dynamic characteristics of hydrocarbon fuel within the channel. A one-dimensional dynamic model was proved, the thermal energy storage effect, fuel volume effect and chemical dynamic effect have been considered in the model, the ordinary differential equations were solved using a 4th order Rungc-Kutta method. The precision of the model was validated by three groups of expe- rimental data. The effects of input signal, working condition, tube size on the dynamic characteristics of pressure, flow rate, temperature have been simulated. It is found that cracking reaction increased the compressibility of the fuel pyrolysis mixture and lead to longer responding time of outlet flow. The responding time of outlet flow can reach 3s when tube is 5m long which will greatly influence the control performance of the engine thrust system. Meanwhile, when the inlet flow rate appears the step change, the inlet pressure leads to overshoot, the overshoot can reach as much as 100%, such highly transient impulse will result in detrimental effect on fucl pump. 展开更多
关键词 dynamic characteristics N-DECANE SUPERCRITICAL PYROLYSIS
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Maximal-overlap adaptive multiwavelet for detecting transient vibration responses from dynastic signal of rotating machineries
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作者 HE ShuiLong ZI YanYang +3 位作者 ZHAO ChenLu CHEN BinQiang WANG XiaoDong HE ZhengJia 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第1期136-150,共15页
Vibration signal is an important prerequisite for mechanical fault detection. However, early stage defect of rotating machiner- ies is difficult to identify because their incipient energy is interfered with background... Vibration signal is an important prerequisite for mechanical fault detection. However, early stage defect of rotating machiner- ies is difficult to identify because their incipient energy is interfered with background noises. Multiwavelet is a powerful tool used to conduct non-stationary fault feature extraction. However, the existing predetermined multiwavelet bases are independ- ent of the dynamic response signals. In this paper, a constructing technique of vibration data-driven maximal-overlap adaptive multiwavelet (MOAMW) is proposed for enhancing the extracting performance of fault symptom. It is able to derive an opti- mal multiwavelet basis that best matches the critical non-stationary and transient fault signatures via genetic algorithm. In this technique, two-scale similarity transform (TST) and symmetric lifting (SymLift) scheme are combined to gain high designing freedom for matching the critical faulty vibration contents in vibration signals based on the maximal fitness objective. TST and SymLift can add modifications to the initial multiwavelet by changing the approximation order and vanishing moment of mul- tiwavelet, respectively. Moreover, the beneficial feature of the MOAWM lies in that the maximal-overlap filterbank structure can enhance the periodic and transient characteristics of the sensor signals and preserve the time and frequency analyzing res- olution during the decomposition process. The effectiveness of the proposed technique is validated via a numerical simulation as well as a rolling element beating with an outer race scrape and a gearbox with rub fault. 展开更多
关键词 fault diagnosis maximal-overlap adaptive multiwavelet two-scale similarity transform symmetric lifting rotating machineries
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