Determination of Resonance Frequency of Air Column for the Measurement of Pressure using Pressure Transducers

In aerospace applications static tests are carried out for design qualification and validation. During tests different types of parameters are measured and acquired. Performance analysis of the system under test is carried out using the acquired data. Pressure is a very important parameter used for performance analysis of such aerospace related systems and subsystems. Pressure transducers of different types are used for measuring pressure parameter. Pressure transducers are available with cavity or without cavity. Based on the type of transducer the response varies and the same is modeled differently. This paper presents the Helmholtz resonator and Organ pipe models for theoretical analysis of the performance of pressure transducer with inlet tubes. Using these analytical models, resonance frequency and damping ratio of pressure transducer with different sizes of inlet tubes are estimated. Dynamic calibration of cavity type pressure transducer is carried out to obtain second order response. Inlet tube of dimensions 6 × 4.1 × 51 mm is used for this purpose. The experimental setup uses an Aronson calibrator, inlet tube, nitrogen gas cylinder, pressure transducer and an acquisition system. Pressure transducer is mounted on the inlet tube which in turn is connected to the calibrator. From the experimental data, dynamic parameters are evaluated using percentage overshoot method. Theoretical and experimental results are used to calculate percentage error.