米-17是米-8的深入改进型号，为提高高海拔高温性能，采用了更加强大的发动机，于1975年开始服役。
Mi-17, entered service in 1975, is the highly improved Mi-8, with more powerful engines for 'hot and high' conditions.
调速试验表明，该PID调速系统降低了发动机转速振荡，减少系统响应时间，有效地提高了整车的性能。
The experiment showed that this PID speed governing system could reduce the surging of engine speed and shorten the system responding time, consequently improve the vehicle performance.
该方法可以提高发动机的加速性能并满足加速过程中的各项约束条件。
By this method, the engine acceleration performance can be improved greatly and each constraint in the acceleration process is satisfied.
模拟计算了各种工况下的发动机性能：怠速工况降低了残余废气系数，提高了进气流速，稳定性得到改善；
We simulate engine performance in various operating conditions:in idle condition, it reduces the residual gas coefficient and increases airflow velocity, so that idle stability is improved.
为提高发动机性能、减轻质量和降低生产成本，开发了一种新型的裂解连杆用钢。
In order to improve engine performance, reduce weight and production cost, a new kind of fragmentation connecting-rod steel is developed.
同时，随着法规的逐渐严格，怎样在降低排放同时提高发动机的性能已经成为现在人们关心的最主要问题之一。
How to save energy and control the exhaust emissions while improving engine performance are the main topics people caring about.
使用该复合添加剂还能够有效地提高发动机的动力性能，延长发动机的服役寿命。
The said additive could also improve the dynamic performance of the engine and prolonged the service life.
同时，装配时连杆与连杆盖紧密接触并互相锁定，可提高曲轴零件的刚度，改善发动机的性能。
At same time, impinging on and mutual lock of rod and cover when assembling them can improve rigidity of other series crankshaft parts and engine performance.
设计高性能喷注器、提高发动机比冲性能是发动机设计者一直追求的目标。
To design a high performance injector and to improve engine impulse performance are the permanent goals of engine designers.
为了提高发动机的效率和扭矩、改善发动机的性能，针对CA4GE发动机研究、设计、开发了发动机塑料进气歧管。
In order to improve engine efficiency and torque as well as the engine performance, plastic intake manifold was developed for CA4GE engine.
新工艺的采用，有效地提高了发动机的性能。
A new technology is applied, which can improve effectively the properties of engine.
这对提高火箭发动机壳体力学性能有很大的作用。
It can be very useful to promote the physical performance of rocket-engine-rind.
随着现代航空发动机性能的持续提高，气冷涡轮的设计变得越来越重要。
With the continuous improvement in performance of modern aeroengines, the design of air-cooled turbines has become ever more important.
为提高发动机台架试验的自动化水平，开发了发动机自动化性能试验及标定试验系统。
The quality of automatic bench tests is improved using an integrated system of automatic engine bench tests and EC engine calibration tests.
试验结果表明，先进的控制策略的运用有助于提高发动机的整体性能。
The results of the tests show that the advanced control logic will help to improve the engine's integrative performances.
AMSOIL十六烷值提高升压柴油燃料添加剂的质量，效益的柴油发动机，特别是高性能的设计。
AMSOIL Cetane Boost Additive improves diesel fuel quality that benefits all diesel engines, especially high performance designs.
为提高热声发动机的热力性能，采用氦-氩混合工质对一台驻波型热声发动机进行了无负荷工况的试验研究。
To enhance the performance of a thermoacoustic prime mover, a series of experiments were conducted by using He-Ar mixture as working fluid.
实践证明这种基于遗传神经网络方法的故障诊断系统具有收敛速度快、推广性能强的特点，极大提高了发动机故障诊断系统的效率和准确性。
The convergence and generalization ability of the genetic and neural network system is improved remarkably and the accuracy and the efficiency of engine diagnosis system are added.
本文还对该系统建立了相应的控制策略，根据具体情况选择最合适的工作模式，并优化与发动机相关工作模式的性能，提高整车运行的燃油效率，减少尾气排放。
The vehicle control strategy is established to choose the most appropriate operation mode and optimize the overall vehicle operation involving the engine in terms of fuel economy and emission levels.
论述了固体火箭发动机用绝热层材料的烧蚀过程以及提高耐烧蚀性能的功能添加剂的种类和作用。
The ablation process of insulator in solid rocket motor is expounded. Some functional additives increasing ablation property are described, too.
随着对发动机性能和排放要求的不断提高，使得配气机构的开发和研制以及使用新型配气机构变得更加迫切。
As the engine becoming more intensify and its speed increasing quickly, the development and application of new model valve train getting more and more urgently.
但当点火能量增大到一定程度后，继续提高点火能量对发动机燃烧性能的影响不再明显。
But when reach a certain line, further spark energy increase will not improve the combustion significantly.
但当点火能量增大到一定程度后，继续提高点火能量对发动机燃烧性能的影响不再明显。
But when reach a certain line, further spark energy increase will not improve the combustion significantly.
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