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�������պ����ѧѧ�� 2006, Vol. 32 Issue (04) :391-394    DOI:
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1. �Ͼ����պ����ѧ ����ѧԺ, �Ͼ� 210016;
2. �Ͼ����պ����ѧ �����ѧԺ, �Ͼ� 210016
New algorithm of processing multi occultation and its application in infrared radiation calculation of military helicopter
Chen Haitao1, Bian Enrong2*
1. School of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. School of Aeronautics and Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

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Abstract�� To solve the problem of calculating visible net area under any direction in infrared radiation calculation for military helicopter, a new algorithm based on stochastic simulation was proposed. By using surface modeling method, the helicopter's three-dimensional model was constructed and discretilized into quad surface elements. The mathematic model for helicopter was represented with the winged-edge structure. Visibility test, depth test and shelter test were applied to find out all the other polygons that have occultation relationship with the researched spatial polygon, then put them into a set. The statistics method of random variable was introduced subsequently to calculate the net area of this polygon. The calculation results of certain military helicopter and simple object show that the percentage error for simple object can be controlled within 5%, and for complex object can meet the engineering requirement by controlling the total polygons and random points reasonably. The algorithm has been used successfully in the calculation software of military helicopter 's infrared radiation. Applications show that the algorithm is stable, reliable and suitable for engineering analyses.
Keywords�� military helicopter   infrared radiation   occultation   random variable     
Received 2005-04-11;
Fund:

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�º���, �����.��װֱ���������������ж����ڵ�����[J]  �������պ����ѧѧ��, 2006,V32(04): 391-394
Chen Haitao, Bian Enrong.New algorithm of processing multi occultation and its application in infrared radiation calculation of military helicopter[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(04): 391-394
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