Wavelet application for reduction of measurement noise effects in inverse boundary heat conduction problems

Ahmadi‐Noubari, H.; Pourshaghaghy, A.; Kowsary, Farshad; Hakkaki-Fard, Ali

doi:10.1108/09615530810846356

Cited by 10 publications

(3 citation statements)

References 21 publications

(29 reference statements)

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“…For smoothing the time-temperature history, the Gram orthogonal polynomials can be used, described in detail by Taler (1995). In turn, in the study by Ahmadi‐Noubari et al (2008), for reduction of temperature measurement noise effects, the application of wavelet denoising algorithm was proposed.…”

Section: Introductionmentioning

confidence: 99%

Identification of three-dimensional transient temperature fields in thick-walled elements using the inverse method

Jaremkiewicz

2018

HFF

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Purpose The purpose of this paper is to propose a method of determining the transient temperature of the inner surface of thick-walled elements. The method can be used to determine thermal stresses in pressure elements. Design/methodology/approach An inverse marching method is proposed to determine the transient temperature of the thick-walled element inner surface with high accuracy. Findings Initially, the inverse method was validated computationally. The comparison between the temperatures obtained from the solution for the direct heat conduction problem and the results obtained by means of the proposed inverse method is very satisfactory. Subsequently, the presented method was validated using experimental data. The results obtained from the inverse calculations also gave good results. Originality/value The advantage of the method is the possibility of determining the heat transfer coefficient at a point on the exposed surface based on the local temperature distribution measured on the insulated outer surface. The heat transfer coefficient determined experimentally can be used to calculate thermal stresses in elements with a complex shape. The proposed method can be used in online computer systems to monitor temperature and thermal stresses in thick-walled pressure components because the computing time is very short.

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Section: Introductionmentioning

confidence: 99%

Identification of three-dimensional transient temperature fields in thick-walled elements using the inverse method

Jaremkiewicz

2018

HFF

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“…In recent years, extensive research has been conducted on the development of methods based on solving inverse heat conduction problems [5][6][7][8][9][10][11][12][13]. These methods enable determination of the inner surface temperature on the basis of two known boundary conditions on the outer surface.…”

Section: Introductionmentioning

confidence: 99%

Determination of transient temperature fields in thick-walled elements using the inverse method

Jaremkiewicz

Cebula

2017

E3S Web Conf.

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Abstract. The purpose of this paper is to propose a method of determining the transient temperature of the inner surface of thick-walled elements. The method can be used to determine thermal stresses in pressure elements. An inverse marching method is proposed to determine the transient temperature of the thickwalled element inner surface with high accuracy. The inverse method was validated computationally. The comparison between the temperatures obtained from the direct heat conduction problem solution and the results obtained by means of the proposed inverse method is very satisfactory. The advantage of the method is the possibility of determining the heat transfer coefficient at a point on the exposed surface based on the local temperature distribution measured on the insulated outer surface. The heat transfer coefficient determined experimentally can be used to calculate thermal stresses in elements with a complex shape. The proposed method can be used in online computer systems to monitor temperature and thermal stresses in thick-walled pressure components because the computing time is very short.

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“…This can be achieved via providing information in other parts of the system through special equipments. Such problems involve a variety of challenges and have received considerable attention from many researchers in recent years (Beck et al, 1985;Murio, 1993;Al-Khalidy, 1998;Taler and Duda, 2001;Park and Jung, 2001;Lamm, 1995;Alifanov, 1994;Machado and Orlande, 1997;Molavi et al, 2010a, b;Ö zisik and Orlande, 2000;Pourshaghaghy et al, 2007;Kowsary et al, 2006;Ahmadi-Noubari et al, 2008). Assessment of heat flux profile at the surfaces of a conductive body from the measurements of temperature at a few points in the domain is typically called the inverse heat conduction problem (IHCP).…”

Section: Introductionmentioning

confidence: 99%

Novel gradient‐based methods for heat flux retrieval

Molavi

Rezapour

Noori

et al. 2013

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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Purpose -The purpose of this paper is to present novel search formulations in gradient-type methods for prediction of boundary heat flux distribution in two-dimensional nonlinear heat conduction problems. Design/methodology/approach -The performance of gradient-type methods is strongly contingent upon the effective determination of the search direction. Based on the definition of this parameter, gradient-based methods such as steepest descent, various versions of both conjugate gradient and quasi-Newton can be distinguished. By introducing new search techniques, several examples in the presence of noise in data are studied and discussed to verify the accuracy and efficiency of the present strategies. Findings -The verification of the proposed methods for recovering time and space varying heat flux. The performance of the proposed methods via comparisons with the classical methods involved in its derivation. Originality/value -The innovation of the present method is to use a hybridization of a conjugate gradient and a quasi-Newton method to determine the search directions in gradient-based approaches.

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Wavelet application for reduction of measurement noise effects in inverse boundary heat conduction problems

Cited by 10 publications

References 21 publications

Identification of three-dimensional transient temperature fields in thick-walled elements using the inverse method

Identification of three-dimensional transient temperature fields in thick-walled elements using the inverse method

Determination of transient temperature fields in thick-walled elements using the inverse method

Novel gradient‐based methods for heat flux retrieval

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