共查询到20条相似文献,搜索用时 156 毫秒
1.
2.
3.
4.
5.
本文对弦的横振动方程进行了严格推导,得出波速的解析解,并在共振时测量了波长和共振频率的实验值,理论与实验相吻合.本文对杆的横振动方程亦进行了严格推导,对一端卡住、另一端自由时进行了数值求解,得出共振时容许的前几个本征频率的表达式及相应共振波节位置,给出通解,实验中测出了不同长度时不锈钢薄细长条的基频及前几阶泛音共振频率,测出的波节位置与理论值一致,并求出不锈钢长条的杨氏模量,与标准值相符.进一步推广到圆形钢丝环的小振动情形,实验上测出了圆环共振时的频率及波长,求出截面为圆形的细钢丝的杨氏模量,与现有值基本符合. 相似文献
6.
7.
8.
利用力敏传感器的电压输出特性与受力之间的关系结合静力称衡法,从理论上推导出了测量细丝直径的公式,然后设计出了相应的实验方案并进行了验证.利用该公式测量出的细丝直径与常规方法测量出的细丝直径相比较,二者的测量结果相差甚小,说明测量细丝直径的方案确实可行.这种测量细丝直径的新方法,在实际生活和教学科研方面有一定的参考和应用价值. 相似文献
9.
10.
基于传统的用拉伸法测量钢丝的杨氏模量实验,利用CSY-998型传感器平台研究钢丝杨氏模量,一方面是对电桥法中电阻式应变传感器的实际应用,另一方面通过与其它实验方法的比较,对学生拓展思维、创新实验也起到了较好的作用。 相似文献
11.
12.
本文在传统的力学量测定的实验基础上,利用电学量参数变化测定杨氏模量,达到研究应力与应变的规律。 相似文献
13.
直流双臂电桥在测定金属杨氏模量中的应用 总被引:1,自引:1,他引:0
本阐述了QJ44型直流双臂电桥的适用范围及测量原理,将对长度及长度增量表示的金属杨氏模量公式换算成以电阻及电阻增量表示的杨氏模量公式。从而通过测量金属丝拉伸前后的电阻值,计算出金属杨氏模量。 相似文献
14.
本文系统地研究了动力学法测量杨氏模量的实验原理,结果表明实验测得的频率是金属棒与换能器组成的系统的固有频率,并得到该频率的基本公式.结果还证实由外推法处理后的频率的确是金属棒的固有频率. 相似文献
15.
分析了测量圆柱体弯曲形变杨氏模量的实验原理,得出了理论公式,将测量拉压形变、弯曲形变的杨氏模量以及扭转形变的剪切模量3个实验中样品形状统一成圆柱体. 相似文献
16.
17.
18.
《声学学报:英文版》2015,(4)
Density and elastic modulus change ratios are introduced to describe the sound velocity of submarine sediment.The density change ratio is a composite parameter describing the sound velocity.It is expressed by three physical parameters:porosity,solid phase density and seawater density.The elastic modulus change ratio is also a composite parameter of sound velocity.It is expressed by three physical parameters,including porosity,solid phase modulus and seawater bulk modulus.The sound velocity formula can be developed into a Taylor polynomial formula of these two composite parameters.The change in the two composite parameters constitutes the sound velocity surface,which contains the complete information regarding velocity properties and sediment characteristics.The one-parameter velocity formula is a curve on the velocity surface.Each porosity-velocity empirical formula,which represents various sea locations and conditions,is transformed to a standard form.This result is the product of a reference velocity and a modulation function.Comparisons of the numerical calculation and measurements show that the derived modulation functions yield similar results.The difference between the velocity formula derived in this paper and the Wood velocity formula is due to the elastic modulus models. 相似文献
19.
20.
Nicolas Javahiraly Ayoub Chakari Lionel Calegari Patrick Meyrueis 《Optics & Laser Technology》2004,36(3):239-243
We propose a new optical method for the determination of the rigidity modulus G of solid materials. The rigidity modulus is determined by measuring the twisted angle θ as a response of the material sample, depending on the applied force. The measuring of this twisted angle can be carried out by using an adapted polarimetric sensor. The effective measurement of rigidity modulus G for aluminum, Plexiglas and steel was experimentally obtained 1.4464×1010,0.99417×109 and 1.0395×1011 N m, respectively. The study has demonstrated the effective usefulness of our method for evaluating the rigidity modulus. A good agreement between the theoretical and experimental results was achieved. 相似文献