变速

It is the high and new technical products, so it can replace the mechanical transmission and can produce a cess of around 35%.

该产品属机电一体化的高新技术产品，高附加值产品，是机械变速的更新换代产品，产品利税率在35%左右。

It mainly by the gear transmission chain drive components, gear transmission gear from the two groups to achieve variable-speed rotary tiller planting problems.

它主要由齿轮传动链传动组成，其中齿轮传动由2组齿轮来达到旋耕播种变速速问题。

To add the finishing touch to the executive design of the interior, the gear lever knob is set with leather and chrome.

要添加画龙点睛的内部行政设计，变速杆旋钮设置皮革和铬。

The t你好n film packing,equipped with a chopstick clamper and an automatic stopping,features embossing,three-sided sealing,cutting,automatic counting and tiding up.

一双筷子包一个袋子，经由过程压花，三边封口，切断，完成包装。全机设有统计、收拾整顿、夹筷不用人的劳力停机、变频变速等装配。

Researches show that the drive force characteristics of the electric tractor drive system based on series DC motor is close the ideal characteristics, the curves are concave, low speed with constant power, and high speed with constant torque; the electric tractor has large working speed under different shifts, but the extensive coincidence speed shows that the variable ratio of the gear is unreasonable; the maximum climbable gradient of this electric tractor is more than 30%, and does not need frequent shift when working for its extensive climbable gradient; there are many influence factors of continuous working time, which the more obvious factors are working speed and working load, the working time increases with the increase of the working speed and working load.2. Simulation researches on the drive characteristic of the electric tractor.

研究结果表明：基于串励直流电动机(来源：ABC21论文网www.abclunwen.com)的电动拖拉机电驱动系统的驱动力特性场接近理想驱动力特性场，其各挡下的驱动力特性是一组下凹的曲线，低速恒转矩，高速恒功率；同一行驶速度下所对应高挡驱动力大于低挡驱动力，这是由电机的调速特性决定的；电动拖拉机各个挡位下具有较广的稳定作业速度范围，但是各个挡位之间速度重合的范围较多，说明所用变速箱变速比与电动机匹配不合理；电动拖拉机最大爬坡度达到30%以上，并且各挡爬坡度变化范围较广，作业过程中不需要频繁换挡；影响电动拖拉机连续作业时间的因素较多，其中作业行驶速度和作业负荷影响最为明显，作业负荷越大，连续作业时间就越短，作业速度越快，连续作业时间就越短。2、电动拖拉机驱动特性仿真研究。

The drive system adopts 5 independent drive mechanisms and a common drive mechanism, therefore both the working space and cost are reduced. In the design of the control system, the hydraulic servo technique and modern control technique are applied. The hydraulic stepless variable speed device adopts compound open and closed static pressure drive pattern, ensuring the smoothness of the drive.

其中的传动方案设计中采用5个独立的传动系统和1个共用的传动系统，既节约了空间和成本，又满足了技术要求；控制系统设计中运用了液压伺服技术和现代控制理论技术；液压无级变速装置采用闭式和开式静压传动系统相结合的方式，传动系统平稳，波动小。

I only completed simply variable speed constant frequency test and synchronization test because of time and equipment.

由于时间，器件等的原因，只完成了基本的变速恒频实验和并网实验。

Analysis of a Variable Speed Constant Frequency Wind Power Generation System works.

详细说明：析了变速恒频双馈风力发电系统的工作原理。

The model of hydraulic motor pump variable speed control system is built.

同时建立了该液压电机泵变速控制系统的数学模型。

In order to produce domestic controllers of wind turbine generators, by analyzing corer problems, hardware type-choosing methods and software control processing, a solution to the pitch control algorithm of the MW wind turbine generator controller is proposed, based on the PID control of blade's rotate speed, accelerated speed and pitch angle.

为实现风力发电设备核心控制器国产化，通过分析风力发电机核心控制器所要解决的主要问题、硬件选型方法和软件控制流程，对兆瓦级变桨变速风力发电机组核心控制器提出基于叶轮转速、加速度和角度PID控制的变桨控制算法解决方案。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷