数学模型

Based on the simple global noise source, take the noise which is cared by people into account. Get the sound pressure level after processing the noise sources sound pressure. Educe the allowable value of the upper limit, through linking to the sound pressure level which is permitted. Taking the value into the reliability modals established before, found the diplex integral mathematics modals that is restricted.

考虑约束因素的影响，引入人们所关心的噪声，以结构简单的球形声源为基础，在对声源声压做了相对处理后，得到其声压级，结合许用声压级指标，求得许用频率上限值，将该值代入已建立的防共振模糊可靠度模型，建立有约束防共振模糊可靠度计算的双重积分数学模型。

The method and corresponding models are firstly presented to fit observation data of creep with renovated normal distribution curve.

同时考虑岩土工程的随机性和模糊性，应用模糊优选理论对有关数学模型解算中权的确定进行了研究，并给出了相应的计算权重模型。

In chapter 2, the present distribution parameter of fluid pipe are analysed and compared with each other in both time domain and frequency domain. One of them is considered to be most suitable for theoretical analysis of hydraulic system.

第二章分别从时域和领域两个角度，对现存的各种流体管道数学模型进行了分析和对比，从中选择适合本课题进行研究的流体管道模型。

The guidance system is built according to the relative relationship in three dimensions. For longitudinal plane, by introducing the subsidiary smooth function, the attraction domain of sliding mode are analyzed and determined, and the stability of the guidance system is proven, considering from the coupling relations of two planes in three dimensions.

根据末端三维弹目相对运动学关系，建立了三维制导系统的数学模型，并以纵向平面模型和变结构控制中到达条件为基础，引入分段光滑连续函数，以三维平面间的耦合关系为出发点，从两个方面分析并确定了过载受限变结构制导律的滑动模态吸引区，证明其制导系统的稳定性。

Based on the systematic analyses of the applications and developments of step motor, the driving technique of step motor are analyzed in this paper, and upon these statements, a mathematical model of VR step motor is built. With this model, the coil current of step motor with chopping driver and the non-loaded starting frequency are simulated for the base of designing of step motor servo system.

本文在系统分析了步进电机应用和发展的基础上，对步进电机的驱动技术作了详尽的论述，建立了三相反应式步进电动机的数学模型，并利用该模型对斩波驱动的步进电机绕组电流及空载运行的启动频率等进行了仿真，为步进电机驱动系统的设计提供了依据。

The accuracy of the friction model directly affects the position precision,dynamic characteristics and friction compensation of mechanical systems.

针对预滑动摩擦的建模，重点介绍了几种描述预滑动摩擦的数学模型，并对各种模型的特点分别加以讨论。

A new method which utilize the data of electrometric titration of the known acid to establish a multiple-unit linear regression math model is proposed for the analysis of the liquid propellent in order to overcome the shortcoming of accuracy lower in available analyzing method and requiring more precious instruments in neural network method.

该方法利用已知酸的电位滴定数据建立多元线性回归数学模型，利用化学因子分解该模型，对未知样进行浓度测定。

This paper discuss the character of jacquard knitting technics ,we analyse the relationships between knitting technics and embossment graph and give a math model.

本文讨论了针织纬编电脑提花大圆机编织工艺的特点，然后对编织工艺与图形学中的浮雕图形的特点进行分析，提出其完整的电脑提花大圆机编织工艺的浮雕算法数学模型，同时对模型中的几个关键参数进行了讨论，最后给出了该算法在花型系统中的应用成果。

The theoretic mathematical model is deduced according to the principle of energy balance and is validated by system identification.

从能量的角度推导了系统的机理数学模型，并用系统辨识的方法验证了该模型。

After establishing index system, we find a mathematical model that suitable for this system--Data Envelopment Analysis model.

在建立了指标体系之后，我们找到适合这一体系的数学模型——数据包络分析模型。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。