(1) Sound intensity measurement allows accurate identification, isolation and ranking of individual sound sources.

(2) For sound intensity probe, the design project based on pp algorithm is firstly put forward.

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

(4) A measuring method for two microphone cross spectrum sound intensity suits for the determination of acoustical power of a machine and the identification of sound source on the spot.

(5) As a vector, the measurement of the sound intensity involves it's amplitude and direction.

(6) The noise power, sound intensity, sound presure, vibration velocity and corresponding frequency spectrum of JHC6400 rear axle surface were measured and analysed.

(7) The measurement of sound intensity can be applied to course detect , product research and development applications.

(8) Objective To investigate the effects of sound intensity and frequency on phonatory stability.

(9) The noise power, sound intensity, sound pressure, vibration acceleration and corresponding time-frequency spectrum of 6480 driver axle surface were measured and analysed.

(10) A measure of sound intensity equivalent to one decibel at 1000 Hz.

(11) This paper has explained the characteristics, virtue of sound intensity measurement and the principle.

(12) People tend to adjust the volume upward as their ears become accustomed to a given sound intensity.

(13) Because the irrotational component of the active intensity depends on the surface sound intensity, measuring the surface sound intensity can avoid the effect of the rotation.

(14) 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.

(15) Then the paper puts up the modeling and designing of functions of noise analyzer such as noise spectrum analysis, sound intensity and so on.

(16) System hardware circuit audio digital signal source achieve this functions:Sound signals, sound intensity level control, data communications, liquid crystal display, alarm and power.

(17) The phase mismatch error is the main error source of sound intensity measurement system.

(18) The noise characteristics of the idle bandsaw were measured with sound intensity method. Thevalues of sound intensity. vector chart, contour chart and mesh chart of noise were obtained.

(19) In chapter two, wave motion equation, sound energy, sound energy flux density, sound intensity and its scaling method and the theorem of two-microphone sound intensity have been introduced.

(20) Moreover, the removal efficiency of ultrafine particles increases with sound intensity increasing.

(21) The results of measurement are affected apparently by the relative phase shift between the two microphones of the transducer of the sound intensity meter, especially in the lower frequency range.