Research on Design of the Resistance Probe and Experiments Using the Probe

According to our prior research,sound radiation resistance expression has been derived with measurable sound pressures.In this paper,sound radiation resistance is studied by experimental research.A small loudspeaker is selected to approximate a point simple source,two microphones are choosed to measure surface sound pressure and the sound pressure of loudspeaker cavity separately.A sound radiation resistance probe is designed and signal acquisition device is selected.Then a measurement system is set up.The probe and the measurement system are used to measure the sound radiation resistance of baffled circular piston.Analytical and experimental radiation resistance curve as a function of frequency are compared.The results show that the analytical and experimental predictions for the resistance are in close agreement between 1 kHz and 3 kHz.Thus the resistance probe can be used to predict radiation resistance of geometrically complex boundary surfaces.