Fuzzy control of the discharge pressure of sand pump during refracturing;

Volume efficiency,internal leakage and exhaust pressure will cause temperature rise of Roots blowers.

In order to find the relationship between punching rate and exhaust pressure,we used Fluent software to simulate the inner flow field of mufflers with different punching rate.

Using relationship between the change of the instant exhaust pressure of the engine and speed, the frequency signal of the engine exhaust was collected and transited into electrical signal, which was delivered to signal processor and converted into digital pulse signal, then transferred to the center processor.

The serial control of the compressors discharge pressure;

Analysis of influence of discharge pressure on the uncertainty measurement of reciprocating refrigeration compressor;

For a split type air source heat pump, compares and analyses variation of the parameters such as compressor shaft power, suction and discharge pressures under normal defrosting and false defrosting conditions.

During the modelling for optimizing the production parameters of progressive cavity pump wells using the nodal system analysis,both discharge port pressure and suction pressure need to be calculated in order to further choose progressive cavity pump and design rods according to pressure difference.