Investigation and development of a dynamic pressure measurement standard

Dynamic pressure is measured in many important fields such as combustion analysis, automotive industry, turbomachinery, aerodynamics, fluid power and control, production processes and within medicine. The encountered amplitudes range from a few Pa to several GPa and frequencies range from below one Hz to about one MHz. Along with the development of higher frequency sensors came the need for dynamic pressure calibration. Since dynamic calibrators were not commercially available until relatively recently, many laboratories developed unique calibration devices to suit specific needs. These included a variety of hydraulic and pneumatic shock, pulse, and sine wave pressure generators. The dead weight tester was sometimes used in a pressure release mode to generate a known, negative pressure pulse. This investigation aims to make step change improvements in pressure in for dynamic measurements. To investigate and develop a dynamic pressure measurement standard, a system was designed and manufactured. A drop weight system and impact test machine system were modified and it was automatized. Maksimum acceleration and velocity of dropping mass were masured and thanks to energy conservation laws, pressure value was calculated. A model function was defined. For the pressure transmission media, different oils was investigated in terms of pressure transmission and compressibility. As a pressure range, 500 MPa was tried to exceed at the 1% accuracy.