41 results about "Finite difference coefficient" patented technology

The invention provides a digital truck scale offset load error correction method based on a least square method, belonging to the field of weighing and metering and relating to a correction method for reducing the digital truck scale offset load errors, particularly relating to the correction of the truck scale offset load errors by means of the least square method. According to the method, the offset load errors of a digital truck scale are corrected by means of the least square method, namely, the offset load errors are reduced by acquiring a better angle difference coefficient through optimization, for a commonly used digital truck scale, the sensor values under the state that the scale is empty are written down , and then the sensor values under the angle pressing operation for many times are written down, the frequency of the angle pressing operation is greater than or equal to the number of the sensors, the values are substituted into the equation derived by the least square method to obtain an optimal angle difference coefficient. The method is simple in calculation and can be conveniently transplanted into a microcontroller. The weighing weight is calculated by using such a method, the levelness of the installation of a digital electronic truck scale is improved and the errors caused by the inconsistency of the sensitivity of sensors can be reduced, and the weighing accuracy of the truck scale is improved.

The invention discloses an implicit staggered-grid finite difference elastic wave numerical simulation method and device. The method comprises the steps that a dispersion relation expression is obtained based on an implicit staggered-grid finite difference scheme and a plane wave theoretical formula; (M+1) discrete points are evenly taken within the value range of beta in the dispersion relation expression, and the left and right sides of the dispersion relation expression are set to be equal on the discrete points so that a linear algebraic equation set is obtained; the linear algebraic equation set is solved so that the implicit staggered-grid finite difference coefficient am and constant b are obtained; an elastic wave equation is solved based on the implicit staggered-grid finite difference coefficient am, the constant b and the implicit staggered-grid finite difference format; and a wave field diagram is generated according to the solving result and wave field analysis is performed according to the wave field diagram. The solving error of the elastic wave equation can be reduced and the numerical solution accuracy can be enhanced so that a more accurate wave field stimulation record can be obtained. When the same calculation error is constrained, calculation time can be reduced and calculation efficiency can be enhanced.