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对F D I M I I型新型刚体转动惯量测量仪进行了改进, 从仪器的摆角控制、 周期自动测量两个方面进
行改进, 用改进后的仪器对圆盘和圆环的转动惯量进行测量, 从实验数据分析发现, 圆盘和圆环的理论值和实验值
的百分误差小于5%, 可以有效地减小实验误差 相似文献
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用三线摆对刚体薄圆盘绕不同轴转动时的转动惯量进行测量,通过实验与数据分析,验证了反映刚体转动惯量重要性质的垂直轴定理,从而实现了对刚体转动惯量实验内容的扩充. 相似文献
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PASCO转动运动传感器可以精准地测量并实时地记录物体转动时的角速度。在落体法测量刚体转动惯量的实验中,为了提高实验的精度,将PASCO转动运动传感器与刚体转动惯量实验仪相结合,用PASCO转动运动传感器直接测量角速度并计算角加速度。改进后的仪器简化了实验步骤,提高了实验精度。对圆盘、圆环和圆柱试样的转动惯量进行测量,三组实验的相对误差分别为0.2%、0.7%和0.3%,实验结果准确。通过实验结果可得,改进后的实验仪器操作简单且测量精度很高。 相似文献
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气垫导轨在刚体转动惯量测定实验中的应用 总被引:1,自引:0,他引:1
本文介绍了一种测量刚体转动惯量的新方法。即把气垫导轨和刚体转动仪结合起来来测量刚体的转动惯量,使传统的气垫导轨实验和刚体转动惯量测定实验得以更新,提高了实验测量的精度,拓展了实验内容。 相似文献
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In this paper, a finite element formulation, used to analyze the contact-impact behavior of geared rotor systems coupled with the rotational, lateral, and axial vibrations between gears at high rotational speeds, has been developed. A gear impact element to model the contact-impact behavior between gears has been developed and its numerical method is discussed. A relative displacement measurement idea has been proposed to measure vibration parameter for contrast experiment in high rotational geared system. The equations of motion are derived and solved iteratively during each time increment until the unbalanced force decrease to an acceptable tolerance level. Based on the proposed method, an analysis program, GEARS, has been developed. The contact-impact behavior of geared rotor systems is analyzed especially under high rotational speed condition as numerical examples, which are demonstrated to show the effectiveness of the proposed method. 相似文献
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An instantaneous temperature imaging technique for chemically reacting, supersonic flows over bodies is described and demonstrated in a H2/O2/Ar shock tube flow (M=1.3, 0.7 atm, 1760K freestream). Based on a planar fluorescence measurement, the approach uses a two-line rotational population ratio to infer temperature. The measured 2-d temperature profiles qualitatively match the expected flowfield structure around the blunt body, and the temperature increase across the bow shock in a single-shot measurement agrees within 5–10% of the prediction of a 1-d shock analysis. The significant systematic error sources for the technique are detailed, and the random error effects associated with shot-noise-limited fluorescence images are statistically analyzed to identify transitions which minimize the temperature errors for instantaneous and average measurements. Even for average temperature measurements, the analysis predicts errors which can be as large as 5–10% when noisy fluorescence images are used in conjunction with low temperature sensitivity. In general, temperature errors can be reduced by increasing sensitivity, i.e., the energy separation of the two rotational levels, until the fluorescence shot-noise rises to a value of 30–50% within the temperature range of interest. 相似文献
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本文研究分析扭摆法测量转动惯量实验的系统误差来源,在此基础上对实验方法、装置提出改进,改进后实验结果与理论值的百分差可降低一至二个数量级. 相似文献
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基于阵列波导光栅的智能服装人体测温解调系统研究 总被引:1,自引:0,他引:1
研究并实现了一种应用于智能服装中人体温度测量的阵列波导光栅解调系统。分析了系统的解调原理,搭建了光纤布拉格光栅解调实验平台,采用了强度法解调出光纤光栅的布拉格波长,完成了光纤光栅传感器串联前后解调的实验。结果表明,系统对光纤布拉格光栅的布拉格波长的解调具有高线性度,波长测量精度可达0.001 nm,光纤布拉格光栅传感器间串扰所造成的解调误差为0.000 5 nm,人体温度的测量误差为±0.16 ℃。该解调系统精度高、串扰低,可适用于智能服装中人体温度的测量。 相似文献