那怎样才能降低转速呢？
齿数不同的一对齿轮能够提高或降低转速。
A pair of gears with different number of teeth will increase or decrease the speed of rotation.
要降低噪音，最简单的方法是增大旋翼桨叶的夹角，也叫“节距”，或是降低转速。
The simplest way to dampen a helicopter's noise is to increase the Angle of the rotor's blades, also called the pitch, and slow them down.
本课题研制电子调速器来控制汽油发电机转速，以降低转速超调，提升发电机性能。
This study develop a Digital electronic governor to control rotate speed of Petrol generator in order to reduce rotate speed fluctuate, improve it's performance.
对功率小或转速高的电钻通过设置减速器来增大扭力或降低转速，以提高疏通效果。
The electric drill with small power or a high rotating speed increases torsion or reduces the rotating speed by being provided with a speed reducer in order to increase dredging effects.
为了可靠运行，必须降低转速的波动，即必须有效抑制负载转矩脉动和电机电磁转矩脉动带来的转速波动。
In order to have a reliable operation, must reduce the speed fluctuation, namely must effectively restrain the load torque ripple and motor electromagnetic torque ripple of speed fluctuation bring.
你们现在所要做的，就是降低地球转速，降低2。4秒。
All you would have to do is slow the earth down by about 2.4 seconds.
但是，旋转速度不变的情况下增加球速会降低升力系数。
However, increasing the velocity at a given spin reduced the lift coefficient.
空心圆锥滚子轴承可用油冷却滚子，使温升降低，从而提高了允许的转速。
Hollow tapered roller bearings available oil cooling roller, so that temperature rise reduced, thereby increasing the speed allowed.
压力过大要求变频器降低电机转速，必要时停止部分寿力空压机配件。
Pressure requirements inverter reduce the motor speed and, when necessary, stop part sullair air compressor parts.
但随着负荷率的降低，发动机转速被限制在最小转速下运行，系统的一部分供热量被浪费，一次能利用率降低。
However, with the lower load factor, engine speed is limited to the minimum speed run, part of the system for the heat is wasted, a lower utilization.
转速降低以后，泵的流量会反而增加，而且泵的噪音会降低，但肯定打不到理论流量。
Speed is reduced, the pump flow rate will increase instead, and the noise of the pump will be lower, but certainly can't flow theory.
在这种状况下，必须降低泵的转速，加大电机的功率，加大进出口的管径来减少介质的流动阻力。
Under this situation, we must reduce the speed of pump, increase the power of the motor, increase the import and export of pipe diameter to reduce the flow resistance of the medium.
进一步分析表明，能耗不能降低的原因仍然是因为转速被稳定在最低转速下运行所致。
Further analysis shows that the reasons for reducing energy consumption can not continue because the speed was stable in operation due to the minimum speed.
这是不低于川崎的工厂赛车手，并帮助降低发动机的振动，平滑功率传输，提高了低转速油门响应。
This is on par with Kawasaki's factory racers and helps reduce engine vibration, smooths power delivery and enhances low-rpm throttle response.
提高转速使金刚石刀片切割难度，降低主轴转速使刀片切割速度更快。
Increasing spindle speed makes the diamond blade cut harder, decreasing the spindle speed makes the blade cut faster.
去掉转速传感器可以降低成本及提高系统可靠性。
The removal of speed sensor can reduce the cost and improve the system reliability.
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.
降低了接触应力，提高了轮带、托轮和轴承的寿命，便于实现自动控制和提高窑的转速。
The contact stress is reduced, the life of the wheel, roller and bearings is prolong, it makes autocontrol easy and increases rotate speed of kiln.
CA6140车床主轴转速部分保留原车床的手动变速功能，改造简单易行，可降低劳动强度，提高生产效率。
The spindle speed of CA6140 remains the manual function of shifting gears. The alteration is easy and it can reduce labor intensity and improve productive efficiency.
转笼转速增加使分级精度降低，但对机内粗粉料的分散影响较大。
The classifying precision is decreased with the increase of the rotor rotating speed, and more seriously for the coarse part.
独特的交错纹风扇设计有效减低转速以降低噪音及震动。
Special lateral cross-flow fan makes lower fan rotation speed, which ensures lower noise and vibration levels.
结果表明：合理选择砂轮振动频率或工件主轴转速能有效提高工件表面精度，降低表面波纹度。
The results showed that, with appropriate wheel vibration frequency or appropriate workpiece rotate speed, the surface precision of workpiece can be improved.
研究表明，磁拉力可降低一阶临界转速和临界振幅；
The study shows that the magnetic pull force can decrease both the first critical speed and the critical amplitude.
有源磁力轴承在高转速场合应用时，由于转子的不平衡响应，降低了转子的旋转精度。
The unbalance of rotor deteriorates the rotors rotating precision when active magnetic bearings are used in high speed condition.
根据冷却的实际需要自动调节风扇的转速，不仅可降低功率消耗、节省燃油，而且还可以达到降低噪声、延长发动机寿命等效果。
Automatically modulating the fan's rotational speed according to cooling requirement can not only reduce the power and fuel consumptions, but also reduce noise level and prolong the engine's lifetime.
降低主机转速是船舶普遍采用的节能措施。
Reducing rotational speed run of main engine is generally used for a method of economizing in energy resources on board.
该带以迄今为止所能实现的经过降低的转速驱动，从而减小带的磨损。
The belt is driven at a reduced rotational speed to that achievable hitherto, and thus there is reduced wear on the belt.
该带以迄今为止所能实现的经过降低的转速驱动，从而减小带的磨损。
The belt is driven at a reduced rotational speed to that achievable hitherto, and thus there is reduced wear on the belt.
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