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185 results about "Performance factor" patented technology

Navigation satellite low-orbit monitoring constellation optimization design method

The invention provides a navigation satellite low-orbit monitoring constellation optimization design method. An existing technology foundation and a future technology development trend are fully considered, navigation satellite low-orbit monitoring constellation design requirements and constraint conditions are analyzed, a Walker-[delta] constellation and a sun synchronous regression orbit are selected, and an elevation criterion containing a monitoring station cover factor, a performance factor and a constellation orbit parameter is built at the same time, so a navigation satellite low-orbit monitoring constellation going through the optimization design has good monitoring performance. The optimization design of the navigation satellite low-orbit monitoring constellation can be effectively achieved according to the navigation satellite low-orbit monitoring constellation optimization design method brought forward in the invention, the technical scheme is scientific and optimal, and the navigation satellite low-orbit monitoring constellation optimization design method has high implementability; and the designed constellation can use the less total number of satellites to achieve a large monitoring station cover factor and a large performance factor.
Owner:PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV

Downhole Electric Driven Pump Unit

A downhole electric driven pump unit for oil production comprises a submersible electric motor (1), a driven oil pump (2), a working plunger pump (4), an oil tank (7) provided with a secondary oil filter (8), an oil volume expansion compensator (9) and a hydraulic engine (10). Above-piston and under-piston cavities (11, 12) of the hydraulic engine cylinder (13) are connected to the oil pump suction and discharge sides (15, 16) through a distributor (14). The hydraulic engine piston (17) is connected to the plunger (18) of the working pump. The electric motor is provided with a protector (19) and is cinematically linked with the driven pump shaft by means of the protector shaft. The working pump cylinder (20) is provided with a sealed cylindrical diaphragm (21) made of elastic material such that oil filled cavity (22) is formed. The working pump plunger (18) is mounted such that it is reciprocatingly displaceable in the cavity (22). A pressure valve (31) is arranged above the discharge valve (6) such that a cavity (23) is formed. The compensator (6) is in the form of a cylinder (24) provided with a cylindrical diaphragm (25) which is placed therein such that an internal sealed cavity (26) communicating with the oil tank (7) and an annular cavity (27) is formed. Said invention makes it possible to increase the performance factor and reliability of the unit.
Owner:PONOMAREV ANATOLY KONSTANTINOVICH +3
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