Unlock instant, AI-driven research and patent intelligence for your innovation.

Single-variable B-spline function earth surface sun shape model based on observation data

A sun shape model and observation data technology, applied in genetic model, electrical digital data processing, complex mathematical operation, etc., can solve the problems of model discontinuity, low fitting accuracy, inability to analyze and integrate radiation energy, and achieve high model The effect of continuous features, high fitting accuracy, and high fitting accuracy

Pending Publication Date: 2022-06-24
ZHEJIANG UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a univariate B-spline function surface based on observation data for the problems of low fitting accuracy of the current surface sun shape model, discontinuous model, incapable analytical integration of radiant energy and inability to directly align the model CSR. sun shape model

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Single-variable B-spline function earth surface sun shape model based on observation data
  • Single-variable B-spline function earth surface sun shape model based on observation data
  • Single-variable B-spline function earth surface sun shape model based on observation data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Suppose the analytical model of the sun shape is:

[0025]

[0026] Among them, N i，d (θ) represents the B-spline function basis function, P i represents the control coefficient of the B-spline function, θ represents the angle offset, θ aureole Indicates the maximum angle offset of the peripheral halo, with a value of 43.6mrad. Here, the unit of θ is mrad. In addition, θ disk Indicates the maximum angular offset of the sun center disc, which is 4.65mrad.

[0027] The total radiant energy of the disc and halo sections can be derived as follows:

[0028]

[0029] where Φ disk Indicates the total radiant energy of the disc section. Here, the unit of θ is rad. Since θ is sufficiently small, sin(θ)≈θ and cos(θ)≈1, so

[0030]

[0031] Similarly,

[0032]

[0033] where Φ aureole Indicates the total radiant energy of the halo portion. CSR(χ) is defined as the total radiant energy Φ of the halo part aureole and total radiant energy Φ all The ratio of t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a univariate B-spline function earth surface sun shape model based on observation data, which comprises the following steps: firstly, based on real observation data, processing the data to obtain 84 groups of sun scanning sections; under the condition that a cubic B-spline function fits a left end point interpolation, constructing a quadratic programming problem by adding two constraints; using a differential evolution algorithm to solve node vector positions when CSR is equal to 0.005, using the same node vector number and positions for other 83 sun scanning profiles, performing quadratic programming solution, and determining an optimal control coefficient; 84 groups of sun shape expressions are determined through second-order derivative constraint correction; the sun shape expressions corresponding to the other unknown CSRs are obtained by interpolating the sun shape function expressions of the two adjacent known CSRs. The earth surface sun shape analytical model established by the method has the advantages of high fitting precision, continuous model, and direct alignment of the radiant energy analyzable integral and the CSR. The method has good application value in the field of photo-thermal solar simulation.

Description

technical field [0001] The invention relates to the field of solar photothermal power generation, in particular to a surface sun shape model established based on real solar light intensity distribution observation data. Background technique [0002] In the field of solar thermal power generation system simulation, the shape of the sun (which describes the distribution of solar light intensity from the center to the edge) is one of the foundations of radiant energy density distribution simulation, which directly affects the accuracy of the simulation. Therefore, it is crucial to construct a sun shape model that conforms to the real solar light intensity distribution. Sun shape models are divided into two categories: extraterrestrial sun shape models and surface sun shape models. The extraterrestrial sun shape model does not consider the halo, and the main models used include the Pillbox model and the Kuiper model. The surface sun shape model considers halo. The main models ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/27G06N3/12G06F17/15G06F17/16G06F17/18G06F113/00
CPCG06F30/27G06N3/126G06F17/15G06F17/16G06F17/18G06F2113/00
Inventor 冯结青孙业顺赵乐赵豫红
Owner ZHEJIANG UNIV