Method to evaluate the running time of pneumatic tools in a car workshop
Keywords:DC power transmission, High pass filters, Pneumatics, Pressure regulation, Pressure regulators, Absolute values, Agilent, Air compressor, Digital pressure, Filtered signals, High precision, High-pass, Measuring device, Power supply, Pressure change, Pressure curve, Relay control, Running time, Working point
AbstractA measuring device that is capable of measuring the actual trigger times of several working points simultaneously of pneumatic tools in a car workshop is developed. The system consists of several high precision digital pressure switches capable of fast detection of pressure and the switches have a common power supply delivering 12 V DC. The readings were data logged to the hard disk of a computer with software developed with Agilent VEE-Pro 6.0. The pressure curve shows pressure changes caused by the use of tools and the slow variation caused by the relay control of the air compressor. The absolute value of high-pass filtered signal is smoothed using the Savitsky-Golay smoothing. The system is tested in one car shop where a pressure regulator did not exist, and in a laboratory workshop where a pressure regulator is in all outputs.
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