Delta Form-Factor Calculation for the Cubic Tetrahedral Algorithm

Beran-Koehn, Jeffrey C.; Pavicic, Mark J.

doi:10.1016/b978-0-08-050755-2.50070-1

Cited by 5 publications

(2 citation statements)

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“…Во всех проекционных методах облученная площадка/поверх-ность проектируется на специальную поверхность: на полусферу в методе единичной сферы, на поверхность половины куба [9], на плоскость [10] или на грани те-траэдра [11]. Полученная проекция подразделяется на «пиксели», и для каждого пикселя проверяется, на по-верхность какой зоны падает энергия, прошедшая через этот пиксель.…”

Section: аналитическое решениеunclassified

Integration Parameters Valuation for Surface Zones Radiation Angle Coefficient Computation

Коптелов¹,

Malikov²,

Лисиенко³

2015

Izv. vysš. učebn. zaved., Čern. metall.

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Аннотация. Проведено численное сравнение известных методов вычисления угловых коэффициентов при различном взаимном расположе-нии поверхностей. Предложен простой критерий, который позволяет оценить погрешность вычисления угловых коэффициентов априори. Предложен алгоритм априорного выбора метода и количества узлов интегрирования до вычисления угловых коэффициентов. Алгоритм позволяет существенно сократить время вычисления угловых коэффициентов путем использования минимального количества узлов ин-тегрирования, обеспечивая при этом желаемую точность для каждой конкретной пары поверхностей.Ключевые слова: теплообмен излучением, угловые коэффициенты, интегрирование. INTEGRATION PARAMETERS VALUATION FOR SURFACE ZONES RADIATION ANGLE COEFFICIENT COMPUTATIONAbstract. The well known methods for view factor calculation are compared numerically for various geometric arrangements. Simple criterion is introduced that allows one to estimate the error in the computed view factor a priori. The algorithm for choosing the integration method and number of nodes before calculation of a view factor is proposed. The algorithm allows one to save much computation time by always using minimum number of nodes for each pair of surface zones and insures a desired accuracy.

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Section: аналитическое решениеunclassified

Integration Parameters Valuation for Surface Zones Radiation Angle Coefficient Computation

Коптелов¹,

Malikov²,

Лисиенко³

2015

Izv. vysš. učebn. zaved., Čern. metall.

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“…For further details, the reader is referred to the computer graphics literature, where the method is well documented. 5,6,34,35 Several tests were carried out to compare the form factors given by HeliosFF to analytical form factors for rectangular rooms and rectangular patches. 31 For all cases considered, the maximum difference between the analytical form factors and those predicted by HeliosFF was 15%.…”

Section: Form Factorsmentioning

confidence: 99%

Improved algorithms and methods for room sound-field prediction by acoustical radiosity in arbitrary polyhedral rooms

Nosal

Hodgson

Ashdown³

2004

The Journal of the Acoustical Society of America

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This paper explores acoustical (or time-dependent) radiosity--a geometrical-acoustics sound-field prediction method that assumes diffuse surface reflection. The literature of acoustical radiosity is briefly reviewed and the advantages and disadvantages of the method are discussed. A discrete form of the integral equation that results from meshing the enclosure boundaries into patches is presented and used in a discrete-time algorithm. Furthermore, an averaging technique is used to reduce computational requirements. To generalize to nonrectangular rooms, a spherical-triangle method is proposed as a means of evaluating the integrals over solid angles that appear in the discrete form of the integral equation. The evaluation of form factors, which also appear in the numerical solution, is discussed for rectangular and nonrectangular rooms. This algorithm and associated methods are validated by comparison of the steady-state predictions for a spherical enclosure to analytical solutions.

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A Practical Radiosity Method for Predicting Transmission Loss in Urban Environments

Liang

Liu

2004

J Wireless Com Network

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The ability to predict transmission loss or field strength distribution is crucial for determining coverage in planning personal communication systems. This paper presents a practical method to accurately predict entire average transmission loss distribution in complicated urban environments. The method uses a 3D propagation model based on radiosity and a simplified city information database including surfaces of roads and building groups. Narrowband validation measurements with line-of-sight (LOS) and non-line-of-sight (NLOS) cases at 1800 MHz give excellent agreement in urban environments.

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Delta Form-Factor Calculation for the Cubic Tetrahedral Algorithm

Cited by 5 publications

References 0 publications

Integration Parameters Valuation for Surface Zones Radiation Angle Coefficient Computation

Integration Parameters Valuation for Surface Zones Radiation Angle Coefficient Computation

Improved algorithms and methods for room sound-field prediction by acoustical radiosity in arbitrary polyhedral rooms

A Practical Radiosity Method for Predicting Transmission Loss in Urban Environments

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