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1) Noise, sound power, sound insulation.

2) Noise, sound power, sound insul.

3) First, the sound power and prestige.

4) The sound power level of oil pan was estimated by the method of vibration velocity.

5) Sound power determination using sound intensity methods can be categorized into the discrete point and scanning measurement methods.

6) Considering the attenuation of ultrasound,[http://sentencedict.com/sound power.html] the actual sound power of several different frequencies and different power ultrasonic in the liquid was determined by using the calorimetric method.

7) In this paper, the errors of sound power determination using sound intensity measurement are studied, based on the analysis of experimental results with the eyes of engineering application.

8) Based on the theory, practicable techniques of sound power determination are proposed and correct power formulas presented.

9) Some experimental formulae about jet sound power and jet noise pressure which are contributed by the Noise Control Laboratory of The Pennsylvania State University are recommended.

10) There are specific Powered Mechanical Equipment (PME) with sound power lower than those specified in Technical Memorandum on Noise from Construction other than Percussive Piling (TM1).

11) Sound power determination in reverberation chambers is discussed in the light of normal mode theory. Rigorous as well as statistical formulas are found, and the aged problem of.

12) The sound power and efficiencies of these different aerodynamic sound have been compared with each other.

13) Measurement and calculation of sound pressure level and sound power level.

14) The sound power sensitivity analysis reveals the relationship between the radiation power caused by structure vibration and the design variables of structure.

15) A simple method of grading the internal combustion engine noise by its sound power level is adopted to compare the noises of 4100QBZL diesel engine with cooling fans of different diameters.

16) Oil pan shoulder function due to the uniqueness of oil cooling, so the oil pan was semi-damping enwrapped in the experimentation , The results showed a piece of sound power level lower 1.

17) To verify the accuracy and reliability of the system, contrast tests on reference sound power source and small motor are performed respectively in a semianechoic chamber and a common room.

18) Numerical results show that stiffeners have no important influence on radiated sound power, while decrease surface average velocity and increase radiation efficient.

19) The most difficult things in study of cutting noise are to determine the sound power respect to any cutting position and the noise contribution from one radiator to the total cutting noise.

20) With the measurement of average sound pressure level and sound power level, the noise reduction result of the oil pan made by sandwich steel plate was proved.

21) In the design and manufacture of hearing, our super miniature sound power converter enjoys high reputation.

22) Finally figures of direction coefficient of sound pressure level are given out. Then using these figures the relationship between sound power level and sound pressure level radiated by a fan in...

23) With two typical fans attached to an infinite plate and a finite plate as examples, structure-borne sound power is predicted with the proposed approximate formula.