Analysis Of Uncertainty And Fluid Dynamics For Non-rotating Piston Gauge

Pressure measurement has been influencing people's daily life. PressureMeasurement and Testing Technology is widely used in industrial, defense andscientific research. It reflects the level of our national scientific and technologicaldevelopments with first-class measurement science and technology level. Accuratemeasurement is the guarantee of the correctness of scientific research.This paper first describes the development of pressure measurement industry.Pressure Measurement and Testing Technology is constantly developing. New pistongauge is also emerging. The accuracy of the pressure measurement is improving. Andthe measurement range is constantly growing. As new technologies continue tointegrate into piston gauge, the structure becomes more complex. The principle of thetraditional piston gauge is introduced in the paper. A new design concept for thedeficiencies of the traditional piston gauge is proposed. Compared with the traditionalpiston gauge, new non-rotating piston gauge is advanced.The main content of this thesis are the design and analysis of fluid dynamicssystem about10Mpa no-rotating piston gauge. The structure of traditional piston gauge issimple, and pressure calibrator is manual driven. The hydraulic system is relatively simple. Thepressure calibration system of non-rotating piston gauge is driven by servo motors and micro-flowpump. This no-rotating piston gauge changes basic structure of friction in the traditionalpiston gauge with rolling friction instead of sliding friction. Traditional piston gaugereduces friction by rotary piston which can make the hydrodynamic oil film. Thefriction coefficient value can reach0.03. Rolling friction coefficient can reach0.002. Itimproves the friction conditions. For high-precision measuring instruments, theaccuracy is greatly improved.The weight loading system of non-rotating piston gauge is also different from theconventional piston gauge. The automatic weight loading system and servo motor drivesystem greatly facilitate the operation of the technical operator. The system uses anumber of electronic control technologies to achieve precise control and improve workefficiency.The structure of the piston cylinder in build pressure system and uncertainty of thenon-rotating piston gauge are designed and analyzed in the thesis. This new type pistongauge use linear rolling bearings as the support and replace traditional sliding frictioninstitutions by rolling friction institutions. And the structural advantages are described.In order to facilitate understanding of the accuracy of the machine, this paper analyzes the impact of uncertainty factors, deduced the formula of synthesis uncertainty aboutthe rotating piston gauge. This facilitates the validation of the uncertainty of thenon-rotating piston gauge.Gap leakage is an important research question of the piston gauge. This paperdescribes the gap leaks principle in details. By means of the Fluent software, this papermade a gap of piston leak fluid dynamics simulation analysis. Software simulationanalysis is to verify the principle of this new structure. Unified analysis of the results ofsimulation and experiment, and ultimately determine the rationality of such a structure.After completion of the final assembly of the machine, there is a series ofcommissioning tests. According to the follow-up test data, a reasonable analysis of thenon-rotating piston gauge will be made. The analysis of the conclusions will verify thebasic functions and performance parameters of non-rotating piston gauge. In order tofully validate the performance parameters of the rotating piston gauge follow-up for along time a lot of data analysis must be made.