结合位移传感器,提出了基于弹性形变的拉索索力测量装置和方法,介绍了系统的结构和原理,通过标定、加载试验和滤波获得拉索索力数据和与之对应的拉索形变量数据。最后,经过数据拟合分析得出拉索形变量与拉索索力值的线性关系,并加以验...结合位移传感器,提出了基于弹性形变的拉索索力测量装置和方法,介绍了系统的结构和原理,通过标定、加载试验和滤波获得拉索索力数据和与之对应的拉索形变量数据。最后,经过数据拟合分析得出拉索形变量与拉索索力值的线性关系,并加以验证。当索力测量范围为5~20 k N,测量频率为1 Hz时,最大测量误差将可控制在10%以内,平均测量误差约5%,且随着待测索力的增大,测量精度随之升高。展开更多
In this paper, molecular orientation behavior of polymethylene chains was investigated on the basis of considering long\|distance interactions by using the enumeration calculation method and the rotational isomeric st...In this paper, molecular orientation behavior of polymethylene chains was investigated on the basis of considering long\|distance interactions by using the enumeration calculation method and the rotational isomeric state(RIS) model. The chain lengths are from \%N\%=12 to \%N=\%24, and the Lennord\|Jennes potential was adopted in the non\|local interaction calculations. The molecular orientation function(Legendre polynomial) may be well expressed as\$\$<P\-2(ζ)>/(λ\+2-λ\+\{-1\})=a(λ\+2-λ\+\{-1\})+b\$\$here\% a\% and\% b\% only depend on the chain length, and decrease with the increase of chain length, especially for \%b\%. In the meantime, we also calculate the Helmholtz free energy change in the process of tensile deformation. Comparisons with Gaussian chains are made, and our results are close to those obtained from the Roe and Krigbaum theory.展开更多
文摘结合位移传感器,提出了基于弹性形变的拉索索力测量装置和方法,介绍了系统的结构和原理,通过标定、加载试验和滤波获得拉索索力数据和与之对应的拉索形变量数据。最后,经过数据拟合分析得出拉索形变量与拉索索力值的线性关系,并加以验证。当索力测量范围为5~20 k N,测量频率为1 Hz时,最大测量误差将可控制在10%以内,平均测量误差约5%,且随着待测索力的增大,测量精度随之升高。
文摘In this paper, molecular orientation behavior of polymethylene chains was investigated on the basis of considering long\|distance interactions by using the enumeration calculation method and the rotational isomeric state(RIS) model. The chain lengths are from \%N\%=12 to \%N=\%24, and the Lennord\|Jennes potential was adopted in the non\|local interaction calculations. The molecular orientation function(Legendre polynomial) may be well expressed as\$\$<P\-2(ζ)>/(λ\+2-λ\+\{-1\})=a(λ\+2-λ\+\{-1\})+b\$\$here\% a\% and\% b\% only depend on the chain length, and decrease with the increase of chain length, especially for \%b\%. In the meantime, we also calculate the Helmholtz free energy change in the process of tensile deformation. Comparisons with Gaussian chains are made, and our results are close to those obtained from the Roe and Krigbaum theory.
