无系统的

The invention relates to the measurement field and solves the problem that no method is available for accurately measuring the included angle between the laser emission shaft and the mechanical reference surface in an optical test system with small beam divergence angle and strict requirement for pointing control accuracy.

本发明涉及测量领域，它解决了在光束发散角小、指向控制精度要求高的光学测试系统中，激光发射轴与机械基准面的夹角需要严格测出，目前并无方法对其进行测量的问题。

In this thesis, a detailed dynamics model of various kinds of tracks laid on the bridge such as ballast track, REHDA track, slab track, elasticity supported block track and all kinds of roadbed-bridge transition structure of the high-speed railway is established for the

本文在国内首次针对高速铁路桥上有碴轨道、长枕埋入式无碴轨道、板式轨道、弹性支承块式轨道结构以及各种轨道的路桥过渡段建立了系统全面的动力学模型。

Huaqing Group is specialized in electronic and mechanical application of high-tech enterprises, the main products are electricity motorcycle devices, including Gao Yabao, ignition, regulators, flashlight, relays, the release of resistance, motorcycle plating Pieces, including brake rod, the handle, and change file-under par start, tail planes, bumper, the former bracket, the middle folder, and so on, the electric motor vehicle with brush, brushless motor, in shoring planes, handle, as well as通用汽油机ignition systems, mainly for the Jincheng, Qianjiang, in Shanghai, Longxin, Dayang, in the margin, Jin Hao, such as motorcycle factory整机matching.

华青集团是专业从事电子及机械技术应用的高新技术企业，目前的主要产品有摩托车用电器件，包括高压包、点火器、稳压器、闪光器、继电器、释放电阻等，摩托车用电镀件，包括刹车杆、把手、变档杆、起动杆、尾架、保险杠、前托架、中间文件夹等，电动车用有刷电机、无刷电机、中撑架、把手等，以及通用汽油机点火系统等，目前主要为金城、钱江、宗申、隆鑫、大阳、中裕、豪进等摩托车整机厂配套。

Secondly,this paper makes simulations on PID control,Nonline-PID control and Fuzzy-PID control under step-response and sudden-load change in the case of brush and brushless excitation system.

其次，分别在有刷和无刷励磁系统下，对普通PID、非线性PID和模糊自适应PID三种控制方式在阶跃响应和突变负载的情况下进行仿真，对输出的机端电压进行分析并得出相关结论。

Based on analysis to the principle of back-to-back converter for direct-driven variable speed constout frequency WECS,phase lock loop based sensorless control strategy was adopted to determine the speed and phase angle of PMSG,and its work principle and realization method are analyzed in detail.

在分析直驱型变速恒频风电系统背靠背变流器工作原理的基础上，采用锁相环无速度传感器控制策略对永磁同步发电机的速度和相位进行观测，对其工作原理和实现方法进行了分析。

The simulation and experimental results prove that the PLL based sensorless control can obtain accurate speed and phase angle information of PMSG,have fast response,good current control effect,and good steady-state and dynamic performances,may be used to substitute conventional encoder to control the PMSG,by further improvement especially at low speed,for direct-driven WECS.

仿真与实验结果表明，锁相环无速度传感器控制能够准确获取电机转速与角度信息，响应速度快、电流控制效果好，具有较好的稳态与动态性能，经过进一步优化，特别是提高低速段性能后，可以在直驱风电系统中替代常规编码器实现对永磁同步发电机的控制。

Fang was the first person who pointed and that no difference was made between the voiced and voiceless bilabials, and between lips, teeth, etc.

方以智第一次提出了古人唇音轻重不分、舌音舌头舌上无别、舌音齿音相混、喉音牙音淆乱的理论，切合古音实际，开启了清代钱大昕等人的系统研究。

The University Sports Centre offers a 33-metr indoor swimming pool; a sports hall comprising four badminton courts which can be used for football, basketball, hockey, netball, volleyball, tennis and various regular classes ranging from aerobics to boxercise; a weights room; 3 squash courts; a 9metre indoor climbing wall; cardiovascular workout equipment and 2 sun beds.

学校体育中心拥有一个 33 米的室内游泳场，一个内有 4 个羽毛球场的运动馆，也可用於足球、篮球、曲棍球、无挡板篮球、排球、网球、健美操和拳击训练班，一个重量训练馆、3 个壁球场、一面九米室内登山墙、心血管系统锻炼设备和两个日光浴床。

Landfills without a landfill gas collection system, which vent freely to the atmosphere, therefore have a significant and rising influence on the greenhouse effect.

无堆填沼气收集系统、自由的气氛中宣泄，因此有重大影响，对温室效应的上涨。

Especially in the field of elevator, numerical control machine tool etc., the traditional decelerater-electrical motor drive mode are now gradually replaced by the integrated drive system that is built up power electronic-electrical motor-mechanical load with center of micro-electronic info processor. The main study objects of this item are the gearless elevater traction drive system.

尤其在电梯和数控机床等低速大扭矩驱动领域中，以电子信息处理技术为核心与电力电子电源-电动机-机械负载组成融为一体的闭环无级变速系统，正在逐步取代传统的减速机-电动机驱动模式。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。