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In practice, because my company is chosen engine configured machine, take measures to control the unit itself is very difficult, and unrealistic. Taking into account the oil during operation of the machine is generally mainly in the noise pollution of the surrounding environment, therefore, how to effectively control the oil in the machine room noise external radiation is a very real and must be addressed. Select the program should be able to be done both to effectively reduce ambient noise, but also to organize the flow of air inside the room is good, meets generators needed for the operation of air traffic, in order to guarantee the normal operation of the unit. Simply reduce noise leaking oil at the expense of the air flow within the room will cause the aircraft surface uneven cooling, reducing the generating capacity of the machine oil, affecting the normal use. After years of cooperation with the department of environmental protection, oil consumption engine room noise processing, and accumulated some experience in governance, mainly must determine the appropriate control scheme according to the specific room project, which should take into account environmental standard room Area of ​​the room Retaining structure and form of aircraft models, power, cooling air flow and other factors. Integrated control is the core concept of sound insulation, etc., which uses a sealed envelope will be set off from the world, reducing external sound source sound radiation. The so-called sound insulation and other parts of the overall concept is the envelope structure (such as civil and structural parts for doors, windows and other parts) of the amount of noise should be quite. Channel reserved the room with the outside world (such as the cooling fan outlet, the engine exhaust outlet, room ventilation ports, etc.) must be designed muffler channel and its insertion loss should sound insulation envelope rather, only this will ensure a standard of environmental noise outside the room. We still import a 500 kW unit, for example, oil room interior walls are designed to fit sound-absorbing panels, but with a sound-absorbing ceiling panels, acoustic treatment after this not only increases the amount of noise envelope structure, but also reduce oil reverberant room inside, there are generally 3 ~ 5dB (a) results. For engine noise in the high-frequency noise, because of its short wavelength, the use of blocking the way to achieve their goals. As the engine noise in the low-frequency component is more abundant, the barrier alone can not achieve satisfactory results, it should be used in muffler channel impedance composite structure, with characteristic resistance muffler structure to control the spread of the low-frequency noise. After the engine room noise can be effectively controlled to ensure appropriate environmental standards to meet the requirements of the unit under normal operating conditions, to daytime and 55 dB (A), night 45 dB (A). This is in our previous work has been /confirm/ied.

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