A batch least - squares maximum likelihood estimator is employed to calibrate the model coefficients of accelerometer and a polynomial post - fit method is used to establish temperature models of these coefficients . the temperature models of accelerometer bias and scale factor of accelerometer are established between - 20oc and 50 oc . after compensating the temperature error by using these models , the post - fit residuals of the accelerometer output have been improved to 10 ? 5 g , and the trend term of accelerometer changing with temperature basically vanished 采用最小二乘极大似然估计和多项式拟合的方法,分析加速度计静态模型系数随加速度计壳体温度变化的规律,建立了- 20oc 50oc之间加速度计零偏和标度因数误差的温度模型,应用该模型对加速度计温度干扰进行补偿,补偿后,加速度计输出的拟合均方根误差一到二个数量级,并且基本上消除了加速度计输出随温度变化的趋势项,使得加速度计测量精度得到了明显提高。
Secondly , spfm ( sliding polynomial fitting method ) was discussed and the arithmetic has been compared with pfm ( polynomial fitting method ) . meanwhile , the model was corrected , and the parameters of arithmetic - - system sampling frequency , the length of sliding window and the exponent of fitting polynomial - - have been optimized 并在此基础上讨论了滑动窗多项式拟合预测算法（ spfm ） ，对该算法与普通的多项式外推预测进行了比较，对模型进行了适应性修正，并对算法的参数：系统采样频率、滑动窗大小、拟合多项式指数进行了优化。
Firstly the phase is extracted from interferogram by filtering and displacing frequency spectrum . then the wavefront and the line integral density are recovered by using fft or polynomial fitting method . lastly the radial local density distribution is calculated from the fitting curve of line integral density by the abel inversion 首先对干涉图进行频谱滤波，用频谱移频法从干涉图中提取相位，然后用快速傅立叶变换或多项式拟合实现波面重建，计算线积分密度，再利用abel积分变换从线积分密度的拟合曲线中反演径向体密度分布。
Under windows nt and labview development environment , using the linear fit module , exponential fit module > general polynomial fit module of labview to design a method for fitting the experiment data , the results of curve fitting indicate that the purpose of general polynomial fitting is better than the rest . separating the equivalent input impedance of magnetostrictive transducers without stimulate current from input impedance of it with stimulate loop based on the results of curve fitting , and determining the syntony frequency and electric simulation network parameters of magnetostrictive transducers by this input impedance . finally , with labview network functions , realizing magnetostrictive transducer electric simulation system based on web server and discussing a scheme for this system network by datasocket . the method of this paper can more accurately determine the syntony frequency and electric simulation network parameters of magnetostrictive transducers than the testing method of syntony & anti - syntony . at the same time , discussing virtual instrument measurement system and how to realize magnetostrictive transducer electric simulation network system by labview network functions of network virtual instrument measurement development environment 在windowsnt系统环境和labview虚拟仪器技术开发平台下，首次利用labview中的直线拟合模块、指数拟合模块以及多项式拟合模块，设计了一种对实验所得数据进行曲线拟合的方法，对三种拟合方法进行了比较，曲线拟合结果表明，多项式拟合方法相对于其它两种拟合方法效果更好；根据曲线拟合的结果可从带激励线圈的磁致伸缩换能器的输入阻抗中分离出磁致伸缩换能器铁芯在无激励电流时机械振动形成的等效输入阻抗，并由此输入阻抗确定了磁致伸缩换能器的谐振频率及其电气模拟网络参数；最后通过labview提供的网络功能，实现了基于web服务器的磁致伸缩换能器电气模拟虚拟仪器测试系统，并探讨了通过datasocket技术实现该系统网络化的方案。
At the end of this section the paper specifies three possible failure modes of the ultimate resistance , depending on the ratio between the flexural resistance of the flanges and the axial resistance of the bolts . this numerical analysis includes many nonlinear structure behaviors such as contact status nonlinearities , geometric nonlinearities and material nonlinearities 文章就连接翼缘板刚度的变化和设置加劲肋等构造措施对连接的高强度螺栓内力、翼缘板间的接触压力、撬力和节点刚度的影响进行了对比分析，并对有限元的计算结果进行了多项式拟合。
