TITLE:
Generation of Arbitrary Pressure Pulsation of Wide Frequency Range for Flow Meter Testing in a Laminar Gas Pipeline
AUTHORS:
Mitsuhiro Nakao, Tomonori Kato, Takashi Oowaku, Hirohisa Sakuma, Toshiharu Kagawa
KEYWORDS:
Unsteady Flow, Flow Meter, Linear Wave, Superimposed Wave, Pneumatics
JOURNAL NAME:
Journal of Flow Control, Measurement & Visualization,
Vol.2 No.4,
September
18,
2014
ABSTRACT: The present paper presents a device to test flow meters under an arbitrary pressure pulsation in a gas pipeline with a laminar flow containing frequency components up to 50 Hz, with the amplitude reaching hundreds of pascals. In order to reduce flow noise, the device has a strainer-like element connected to a pipeline under test and uses an open-loop control law based on the frequency response test. The control signal is calculated by adding the inputs to obtain each of the sinusoidal waves included in the original wave, which was decomposed by Fourier analysis. The validity of the developed method is demonstrated through the generation tests of superimposed pressure waves containing frequency components up to 50 Hz. Analysis of the relative uncertainty demonstrated the relative uncertainty to be less than 10% when the generated pressure is larger than 360 Pa.