查询词典 variable-density system

On the basis of analyzing in quo of the waterworks in our country, this designs a suit of constant pressure water supply automatic system paper by using variable frequency speed-regulating technology based on PLC.

本论文结合我国中小城市多层住宅小区的用水现状，设计了一套基于PLC的变频调速恒压自动控制供水系统。

It's pointed out that soft sensor will play more important role in field bus network control system. According to this, a crude solution was addressed. At last, we point out that soft sensor technology must used to build an information warehouse for the whole enterprise, combined with data fusion, data warehouse, data rectification and other related technologies. The main contributions of this dissertation are as follows: The background, requirement, and application situation of soft sensors are expounded, the theories, methods and skills of soft sensing technology are analyzed, and the fruits and problems in current soft sensor technologies are summarized. Some new methods of soft sensor is proposed: A principal component analysis-based secondary variable selection method are proposed; A new conception which modeling data should have gross error detection is addressed, and then a cluster analysis-based modeling data gross error detection method is given.

本文的主要贡献有：对软测量技术根据实践的要求进行了一定的理论研究，针对具体问题提出了新的方法：讨论了辅助变量选择问题，研究了基于主元分析的辅助变量选择方法，该方法克服了传统方法只能利用数学模型产生的仿真数据进行最优辅助变量选择的缺点，可以根据历史数据进行辅助变量选择；提出了建模数据显著误差侦破的概念，指出传统的显著误差侦破研究的是已知过程数学模型的情况，而建模时数学模型是未知的，但是直接来自现场的数据并不能保证不含显著误差，并用基于聚类分析的方法解决了该问题，该方法利用聚类分析原理，直接面对过程数据，不需以过程模型为基础，在此基础上给出了软测量建模过程中样本数据的处理方法。

Motion synchronization between tool in X direction and principal axis rotation was controlled by electronic gearbox in cam turning. And profiling mechanism could be superseded by servo tool-holder. Linear motor direct drive servo tool-holder was designed, and host-slave control system with PC and DSP was developed for the require of high-speed and realtime servo. The technical process was analyzed in cam turning. Servo tool holder with tool swinging and principal axis variable rotate speed were presented to keep constant cutting angle and speed.

将电子齿轮箱用于凸轮车削加工系统的传动，以伺服刀架取代了传统加工的靠模装置，实现了刀具X方向直线运动与机床主轴转动的同步控制；设计了直线电机直接驱动的伺服刀架及基于PC与DSP构成的上—下位机控制结构，采用DSP进行实时控制以满足高速伺服需要；对凸轮加工过程的工艺特点与恒角度、恒速度车削进行研究，提出了具有刀具摆动功能的伺服刀架与机床主轴变转速运动方案。

The principle variation of beam deflection is calculated with two variable parameters: the initial speed and the acceleration of moving mass, using the solution method of time-variant mechanical system.

利用时变力学系统的求解方法，得到在移动质量的初速度和加速度两个运动参数变化情况下，梁的挠度变化规律。

Secondly, it gives the dynamic model and random variable model of closed yard coal wharf logistics system.

其二，建立了封闭式堆场煤炭码头物流系统的动态模型和随机变量模型。

The hierarchy architecture of the compiling system is presented. Thinking about the way of alignment and distribution of a array, the range of a index variable in a FORALL statement, and the subscript expression of the element of a array, the communication requirements in an array assignment are classified into three categories: no communication, SHIFT communication, and other type of communication.

综合数组的分布方式、对准、FORALL语句的空间索引变量范围以及数组元素的下标表达式，将程序语句中所隐含的通信划分为3种情形，即无通信、SHIFT通信和其它通信，指出了这种划分的意义，给出相应的通信检测算法，描述了具体的实现细节；详细讨论了SHIFT通信以及利用阴影区技术对它进行的优化，对于REMAP通信的典型形式及其优化也进行了讨论。

In this thesis, synchronous motor soft-start system based on variable reactance technique is studied .

本文所设计的是基于磁控电抗器技术的异步电机软起动控制系统，为实现交流异步电机的软起动而研究开发。

Infer:with the dynamical system in any state, any result of a measurement of a real dynamical variable is one of its eigenvalues.

如果力学系统处于属于力学变量e属于本征值e'的本征态，则对力学变量e的测量肯定得到结果e'。

However, due to the lack of effective mechanism to reserve proper channel time for real time variable bit rate applications, the system cannot guarantee the quality of service.

然而，因为缺少针对即时性可变动位元率服务所设计的通道时间分配机制，此系统对於该类型的资料传输支援性并不佳。

The order of differential equation is reduced when the dual variable s of Hamilton system are used in mechanical problems.

力学中的Hamilton体系采用对偶变量描述问题。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。