Abstract
The paper describes the test rig dedicated for air gauge dynamical characteristics assessment. The computerised system enables measurement of the amplitudes of back-pressure pk dependent on the input signal circular frequency ω. Dedicated software performs full control on the calibration procedure, which consists of setting a rotational speed and registration of measuring signal, and further data processing. Circular frequency ω was gradually changed with the appropriate step, in order to obtain a series of frequencies in the range from 0.1 to 20 Hz. The response of a measurement system was registered as a sinusoidal curve which after smoothening and interpolation procedures provided an amplitude-frequency graph with its main characteristics, such as time constant and the frequency f0.95 that generated dynamic error 5%. It was demonstrated that sine input dynamic calibration corresponds with real conditions of the in-process measurement with air gauges.
Highlights
The air gauges are known for almost a century as cheap and precise measurement devices [1] with the resolution of 0.1 μm [2]
The most commonly used type is the back-pressure air gauge with electronic conversion of the pressure signal, so it may be incorporated into an extended computerised quality control system [4]
The present paper describes the computerised test rig dedicated for air gauge dynamical characteristics assessment
Summary
The air gauges are known for almost a century as cheap and precise measurement devices [1] with the resolution of 0.1 μm [2]. Some new propositions apply time conversion of the linear dimension with the air gauges [3]. Test rigs are equipped with computers performing detailed analyses of the air gauges [10, 11]. Improving computational capacities stimulates continuous investigations on air gauges dynamic characteristics [12, 13]. Dynamic calibration determines the relationship between an input of known dynamic behaviour and the measurement system output. The present paper describes the computerised test rig dedicated for air gauge dynamical characteristics assessment. It is very important that the dynamic calibration conditions are close to the real conditions of measurement with air gauges, such as roundness assessment [15] or in-situ measurement [16]. The presented test rig applies a sine input and performs the necessary calculations to assess the dynamic characteristics of the examined air gauge
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