Thermal stability is provided by a 3-stage fan with a very low noise level.

热稳定性是由3级风扇的噪音非常低的水平。

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The test results indicate that the system has a very low noise background and can satisfy the most test requirements.

测试结果表明，该系统具有很低的噪声底部，可满足绝大部分测试需要。

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Besides, there is almost no axial and radial force in the advanced hydraulic model, so it can move smoothly, causing very low noise and little vibration.

同时优秀的水力模型几乎没有轴向力和径向力，因而运行平稳、噪音低、振动小。

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"The aircraft had to be able to land and take off in 125 meters, it also had to have a very low noise output and the aircraft needed to be able to accelerate rapidly up to 350 mph in order to get point to point at low level very quickly, " said Avcen managing director Mike Dacre.

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