误差模型

Simulation results show that the relative-effective error of bridge structure parameter identification is less than 10%, the application of Levenberg-Marquardt algorithm is feasible, its quantitative message can be put forward for bridge structure condition assessment.

对一连续粱的数值模拟计算表明，在Gauss-Newton法迭代发散的情况下，Levenberg—Marquardt法的识别结果相对误差在10％左右，Levenberg—Marquardt法基本能实现对真实结构参数的识别，为结构进一步的状态评估提供了结构模型最基本的量化信息。

The simulation for the multi-component linear frequency-modulated signals demonstrates the improvement of classification performance compared with time-frequency analysis only.

以分类误差最小为目标，自适应调整支撑矢量核和时频表示核的参数，并对SAR运动目标回波模型——线性调频信号进行仿真实验，实验结果表明这一方法提高了分类精度，改善了分类性能。

Therefore the author built a 3-D model based on the surface equations of roller gear cam, and presented a method of using coordinate measuring machine to measure the surfaces of the cam.

为此，本文以弧面分度凸轮的轮廓面方程为基础，建立了弧面分度凸轮的三维模型，提出了一种用三坐标测量机测量其轮廓面误差的方法。

The clearance cause more serious effect on the response of turret than that of the rotary table. This result agrees with the experimental response of roller gear indexing cam mechanism. In addition, some problems, such as the impacts on mechanism with clearance, effect on response for preload, effect for inertia of rotary table and stiffness of output-shaft, effect on wave of velocity and torsion for motor characteristic, and so on are investigated.

通过对扭转动力学模型的计算还对以下问题进行了研究：间隙造成的横越冲击的表现；预紧的存在对响应的影响；间隙的存在对有廓形误差的凸轮机构的动力学响应的影响；分度盘轴的刚度和载荷盘惯量对含间隙分度凸轮机构响应的影响；电机特性对转速波动和扭矩波动的影响等等。

Aiming at the key technology of numerical control, taking NC gear shaper as research object, some issues are studied in this paper.1 NC gear shaper YK5120 was developed.1 Three dimensional model of NC gear shaper is built, kinematics simulation and interference checking of NC gear shaper are carried out.2 Based on kinematic theory of multi-body system, the precision of gear shaper and the error of generated gear are analyzed and simulated.3 Applying finite element software, the natural frequency and mode of NC gear shaper are analyzed.

本文针对插齿机数控化中的关键技术，以数控插齿机为研究对象，做了以下研究工作：1 设计完成YK5120型数控插齿机机械结构；2 建立了数控插齿机的三维模型，并对其进行了运动仿真和干涉检验；3 以多体系统运动学理论为基础，对数控插齿机的精度和齿轮加工误差进行了分析与仿真；4 应用有限元软件，对数控插齿机的各阶固有频率及振型进行了分析。

Combining theoretical analysis with experimental demonstration,the mathematical models of the quadrant and the mechanical gravity- pendulum tilt sensor are built.

通过理论分析建立了象限仪读数和机械重力摆式倾斜传感器输出的数学模型，运用数学推导的方法描述了火炮耳轴倾斜随火炮纵倾的关系，从理论上阐明了用象限仪标定炮耳轴倾斜传感器产生误差的原因及其量值，通过试验进行了验证，并提出了解决方法。

Amathematic model of a servo system with a lead screw drive was used to analyze the dynamic characteristics of the servo system in the transfer process.

文中首先描述算法的求解过程，并对其进行了误差分析，然后建立机床伺服系统的数学模型，通过分析轨迹转接过程中伺服系统的动态响应特性，证明了控制算法的有效性。

The geometrical characteristic of error hand for 2D linear segment uncertainty ε(subscript σ) model has been studied in this paper.

对地理信息系统中2维线元不确定性ε模型的误差带的几何特征进行研究。

In this paper, the framework of measuring head of large diameter measurement system in multi-rolling-wheel method is designed by using the designing knowledge of precise mechanic, the knowledge of data processing and error correction and the method of the mathematical model fitting about measuring force and wheel deformation is described.

本论文中应用精密机械设计、数据处理与误差修正等知识，介绍了大直径多滚压轮测量系统的测量头结构设计和滚轮变形与测量力之间数学模型的拟合方法。

In this paper, the framework of measuring head of large diameter measurement system in multi-rolling-wheel method is designed by using the designing knowledge of precise mechanic, the knowledge of data processing and error correction and the method of the mathematical model fitting about measuring force and wheel deformation is described.

中文摘要：本论文中应用精密机械设计、数据处理与误差修正等知识，介绍了大直径多滚压轮测量系统的测量头结构设计和滚轮变形与测量力之间数学模型的拟合方法。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失