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82 results about "Relational equation" patented technology

Gas loss calculation method

The invention relates to a method for calculating gas loss according to a relation between an accumulated desoprtion value and the time. A large quantity of experiments show that the relational equation between the accumulated desorption value in the initial stage after pressure of coal cuttings is released is V=A(t/T)<n>, but the power exponent n is not a constant, is related to the gas pressure and is changed along with the time; accurate determination of the power exponent n of the accumulated desorption value is a key for calculation of the gas loss. In order to accurately calculate the gas loss, the method comprises the steps of 1, firstly evaluating the gas pressure of a coal seam through on-site measurement; 2, recording the observation time t, the accumulated desorption value Vt with the time t, the total desorption time T and the loss time t0 during the on-site measurement of the gas content; 3, measuring the value of n in a lab under a condition of the gas pressure of the coal seam to be measured: obtaining a unitary regression relational equation between lnVt and ln[(t+t0)n-t0n] through Excel by a least square method, wherein an intercept is ln(A/Tn), and substituting the n value and the T value to obtain an A value; and 4, substituting the A value, the T value the n value into V=A(t0/T)<n> to obtain the gas loss V.
Owner:HENAN POLYTECHNIC UNIV

Inertial geomagnetic matching location method under influence of geomagnetic daily variation

The invention provides an inertial geomagnetic matching location method under the influence of geomagnetic daily variation. The inertial geomagnetic matching location method comprises the following steps: reading position measurement values ai and bi of a to-be-matched point at N moments from an inertial navigation system, and obtaining geomagnetic field strength information Ii from a magnetometer; respectively reading corresponding reference values I (ai, bi) of geomagnetic field strength and corresponding gradient reference values Ix, i and Iy, i of the geomagnetic field strength from a pre-stored geomagnetic database according to positions of N to-be-matched points indicated by the inertial navigation system; bringing in and initializing longitude and latitude error, course error and geomagnetic daily variation error; calculating delta M of increment of the longitude and latitude error, increment of the course error and increment of the geomagnetic daily variation error; updating M of the longitude and latitude error, the course error and the geomagnetic daily variation error; judging whether a termination iteration condition is met or not, and calculating parameters K and delta K according to updated M; obtaining the longitude and latitude error, the course error and the geomagnetic daily variation error according to iteration calculation, and substituting an obtained result into a relational equation of a matching track and a reference track, thus obtaining the matching track.
Owner:HARBIN INST OF TECH
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