曲线拟合

This paper introduces eight methods of time-frequency analysis,such as Hilbert transform,Hilbert-Huang transform, sine curve fitting ,Ricker wavelet matching,short time Fourier transform,wavelet .

本文介绍了Hilbert变换、Hilbert-Huang变换、正弦曲线拟合、雷克子波匹配、短时傅立叶变换、小波变换、S变换以及Cohen类这八种方法，并从时间分辨率、频率分辨率，以及对多频率成份信号适应能力等各方面阐述了各种方法的优缺点，对其中的一些方法结合了理论记录进行了试算，进一步阐述了这些方法的长处和不足之处。

In order to predict the post-construction settlement, based on a thorough analysis on the law of settlement development, citing the Verhulst model which good reflect its main characteristic, using the curve fitting method, mining the information contained in the construction data; betakes the improvement non-linear fitting algorithm on the model parameter inversion.

目的 为提高软土路基的工后沉降量预测精度，给设计和造价控制提供反馈信息。方法在深入分析沉降发生发展规律的基础上，引入Verhulst模型，采用改进的曲线拟合的经验计算方法，挖掘施工期的实测数据所蕴含的信息。

The paper reviews the development in the analytical theory of mechanical behavior of composites, pointing out the problems existed, presenting creatively the concept of yarn state, solving the descriptive problem of perform structure of any woven composites and laying the foundation for predetermining the elastic behavior of 3-d woven composites with computer. On the basis of yarn state, the relative cross section deformation theory is introduced, the yarn cross section deformation is studied, and the experiential formula is described in the paper on the basis of experiment. The crimping state of yarn is studied, the classical "straight warp view"is modified, and the crimp height value of crimped yarn is studied. At the same time, with shrinkage rate sine method, the paper proposes the idea which imitate the shape of crimped yarn. With the third power template curve, the paper describes the microgeometry structure of fabric, finding a brief and precise approach for the calculation of mechanical behavior of composites.

本文回顾了复合材料力学性能分析理论的发展，指出了存在的问题，创造性地提出了纱态概念，解决了任意结构机织复合材料预制件结构表征问题，进而为用计算机预报三维机织复合材料的弹性性能打下了基础；基于纱态概念，提出了相对截面变形理论，研究了纱线截面变形情况，在实验的基础上给出了纱线截变经验公式；研究了纱线屈曲状态，修正了传统的&地经纱直线论&，提出了以纱线缩率研究屈曲峰谷值的思想，同时以三次样条曲线拟合了纱线的卷曲形状，较好地描述了织物的细观几何结构，为复合材料力学性能的计算找到了一条既比较简便又比较精确的途径。

In this paper, the practical data is analysed and get a good effect. It proves that it is vailed for VTI layers using the approximation moveout formula in this paper. This method has a good foreground.

本文还结合实际资料进行了分析，取得了较好的效果，说明了用本文建立时距曲线拟合公式进行横向各向同性介质多波速度分析是可行的，且具有广阔的发展前景。

First, the test procedure of anti-lock brakes using JF-132 brake tester is introduced. Then, using curve fitting and optimization method, the linear model, hysteresis model and variable linear model of pressure torque relations are developed based on test data.

首先，介绍在JF-132型汽车制动器试验台上进行防抱死制动器模拟试验的方法，其次，在获得大量试验数据的基础上，运用曲线拟合和优化技术，建立制动压力—力矩关系的线性模型、迟滞模型和可变线性模型。

Chain grate stoker ; step response ; curve fitting ; dynamic performance

链条锅炉；阶跃响应；曲线拟合；动态特性

One of these experiments is that large turbine generator stator end of the two-tier network predigests streamline continuous conical woven conical shell-beam structure or laminated reinforced cone shell model, after experimental modal analysis to identify various parameters

一般来说，力锤的锤头中包含一个压电式力传感器，端部绕组还要安装用于采集振动响应信号的加速度传感器，对两个传感器的信号一起进行频响函数估计，并进行曲线拟合，最后得到被测物的模态参数，根据得到的

When based on dual wavelength chromatographic data analysis, a new method, namely dual wavelength characteristic information analysis, used for the base line correction, determination of number of components and region of pure components signal.

但色谱峰的重叠给多组分的同时分析带来了困难，因此针对色谱重叠峰的解析提出了不少方法，如曲线拟合、神经网络、小波变换、窗口因子分析、直观推导式演进特征投影分析等 [1～ 7] 。

Based on curve fitting,deformation observation data is processed and deformation tendency function is made out.

文章以曲线拟合为基础，对变形观测数据进行分析处理，求解出变形趋势函数。

Adopting the curve fitting method, the relationship between the burnout time, the damage energy and the injecting voltage is obtained.

利用曲线拟合的方法，获得了器件烧毁时间、损伤能量和注入电压的关系。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。