Yves Candau - Academia.edu (original) (raw)

Papers by Yves Candau

Research paper thumbnail of Set membership parameter estimation in the frequency domain based on complex intervals

International Journal of Control, Automation and Systems, 2009

This paper is devoted to set membership parameter estimation for non-linear complex-valued models... more This paper is devoted to set membership parameter estimation for non-linear complex-valued models. In such a context, the error between the measured data and the output model is supposed to be bounded with known prior bounds. The proposed approach is based on set inversion via complex interval analysis. A first contribution of this paper is the extension of logarithm and exponentiel functions to polar intervals. In a second part, it is shown on an engineering application devoted to thermal parameter estimation, that the proposed interval complex representation is useful.

Research paper thumbnail of Identification des sources et quantification de leur contribution aux niveaux de PM10. Etude d'un site industriel en Italie

Journal Européen des Systèmes Automatisés, 2005

Research paper thumbnail of Hourly ozone prediction for a 24-h horizon using neural networks

Environmental Modelling & Software, 2008

Research paper thumbnail of Air pollutant emissions prediction by process modelling – Application in the iron and steel industry in the case of a re-heating furnace

Environmental Modelling & Software, 2007

Monitoring air pollutant emissions of large industrial installations is necessary to ensure compl... more Monitoring air pollutant emissions of large industrial installations is necessary to ensure compliance with environmental legislation. Most of the available measurement techniques are expensive, and measurement conditions such as high-temperature emissions, difficulty of access, are often difficult. That is why legislation can not impose a permanent emission monitoring in many countries. The possibility to replace it with predictive models based on the routine measurements of the main control parameters of the installation is analysed in this paper. In order to identify these models, a special measurement campaign of emissions must be performed or, alternatively, a deterministic modelling of the process can be developed. This study was carried out in the case of a real installation in the steel industry i.e. a billet re-heating furnace. Physical phenomena involved in combustion within the furnace were complex enough to prefer an empirical black-box modelling of the furnace over a deterministic approach. A 3-week monitoring campaign of fume emissions at the stack was performed; furnace process parameters during the same period were available. The relationship between CO 2 emissions and furnace process parameters could successfully be expressed linearly, while NO 2 emission modelling required a non-linear model. Artificial neural networks modelling revealed a good ability to predict NO 2 and CO 2 emissions.

Research paper thumbnail of A nondestructive method for diagnostic of insulated building walls using infrared thermography

This work deals with the development of an experimental protocol for the diagnostic of multi-laye... more This work deals with the development of an experimental protocol for the diagnostic of multi-layered insulated building walls. First, a test bench is set up in order to measure front and back sides temperatures of standard panels. The panels considered have insulation thicknesses of 2, 6 and 10cm. The front side is heated by two halogen lamps of 500W. A CEDIP Jade Long wave infrared camera and thermocouples are used to carry out temperature measurements. In a second time, a one dimensional model based on thermal quadruples and Laplace transforms was developped under Matlab environment. Also, we developped a three dimensional model based on finite volumes using Fluent computational code. Finally, a method of identification of physical parameters is implemented by performing least square minimization based on Levenberg-Marquardt method. The experimental measurements are compared to theoretical results and by minimization we obtain thermal conductivity and diffusivity as well as thickness of the two layers.

Research paper thumbnail of A simultaneous characterization of thermal conductivity and diffusivity of polymer materials by a periodic method

Journal of Physics D: Applied Physics, 2004

A periodic method is used to determine simultaneously both thermal conductivity and diffusivity o... more A periodic method is used to determine simultaneously both thermal conductivity and diffusivity of various polymer materials at room temperature. The sample is placed between two metallic plates and temperature modulation is applied on the front side of one of the metallic plates. The temperature at the front and rear sides of both plates is measured and the experimental transfer function is calculated. The theoretical thermal heat transfer function is calculated by the quadrupole method. Thermal conductivity and diffusivity are simultaneously identified from both real and imaginary parts of the experimental transfer function. The thermophysical parameters of several polymer samples (PTFE, PVDF and PA11) with different thicknesses (respectively, 5 mm, 2 mm and 300 µm) were studied and compared with values from the literature. The values identified for the thermal parameters are in good agreement with values from the literature for PTFE and PVDF samples; however, we show that the method reaches its limit for the thinner PA11 sample, owing to inadequacy of the thermal model.

Research paper thumbnail of A comparative analysis of dielectric, rheological and thermophysical behaviour of ethylene vinyl acetate/BaTiO 3 composites

Journal of Physics D: Applied Physics, 2008

Dielectric, rheological and thermal behaviours of ethylene vinyl acetate/barium titanate sphere (... more Dielectric, rheological and thermal behaviours of ethylene vinyl acetate/barium titanate sphere (EVA/BaTiO3) composite materials were investigated in this work. Several composites were prepared for different volume concentrations (from 5% to 49%) and for two types of spheres sizes d: d = 9 µm and d = 105 µm. We show that the use of larger particles allows an increase of

Research paper thumbnail of Monitoring acupressure stimulation effects by infrared thermography

Qirt Journal, 2004

Acupressure is a healing therapy that provides stimulation without needle by applying any pressur... more Acupressure is a healing therapy that provides stimulation without needle by applying any pressure to the meridians of traditional Chinese acupuncture (the most important branch of the tTraditional Chinese medicine). This article presents an application of the infrared thermography to the thermal reactivity of Human body skin due to the acupressure stimulation. To survey an in vivo human skin surface,

Research paper thumbnail of Validation of a building thermal model by using ALLAN. Simulation software

Energy and Buildings, 1995

This paper presents the ALLAN.™Simulation software, the modelling approach using this tool and th... more This paper presents the ALLAN.™Simulation software, the modelling approach using this tool and the experimental validation carried out for a dwelling subjected to actual indoor and outdoor conditions. ALLAN. Simulation is a software designed at the Gaz de France Research and Development Division and developed with the aid of the Compagnie d'Ingénierie et de Systèmes Informatiques. It is a general

Research paper thumbnail of Complex Interval Arithmetic Using Polar Form

Reliable Computing, 2006

In this paper, the polar representation of complex numbers is extended to complex polar intervals... more In this paper, the polar representation of complex numbers is extended to complex polar intervals or sectors; detailed algorithms are derived for performing basic arithmetic operations on sectors. While multiplication and division are exactly defined, addition and subtraction are not, and we seek to minimize the pessimism introduced by these operations. Addition is studied as an optimization problem which is analytically solved. The complex interval arithmetic thus defined is illustrated with some numerical examples which show that in many applications, the polar representation is more advisable.

Research paper thumbnail of Set membership parameter estimation in the frequency domain based on complex intervals

International Journal of Control, Automation and Systems, 2009

This paper is devoted to set membership parameter estimation for non-linear complex-valued models... more This paper is devoted to set membership parameter estimation for non-linear complex-valued models. In such a context, the error between the measured data and the output model is supposed to be bounded with known prior bounds. The proposed approach is based on set inversion via complex interval analysis. A first contribution of this paper is the extension of logarithm and exponentiel functions to polar intervals. In a second part, it is shown on an engineering application devoted to thermal parameter estimation, that the proposed interval complex representation is useful.

Research paper thumbnail of Identification des sources et quantification de leur contribution aux niveaux de PM10. Etude d'un site industriel en Italie

Journal Européen des Systèmes Automatisés, 2005

Research paper thumbnail of Hourly ozone prediction for a 24-h horizon using neural networks

Environmental Modelling & Software, 2008

Research paper thumbnail of Air pollutant emissions prediction by process modelling – Application in the iron and steel industry in the case of a re-heating furnace

Environmental Modelling & Software, 2007

Monitoring air pollutant emissions of large industrial installations is necessary to ensure compl... more Monitoring air pollutant emissions of large industrial installations is necessary to ensure compliance with environmental legislation. Most of the available measurement techniques are expensive, and measurement conditions such as high-temperature emissions, difficulty of access, are often difficult. That is why legislation can not impose a permanent emission monitoring in many countries. The possibility to replace it with predictive models based on the routine measurements of the main control parameters of the installation is analysed in this paper. In order to identify these models, a special measurement campaign of emissions must be performed or, alternatively, a deterministic modelling of the process can be developed. This study was carried out in the case of a real installation in the steel industry i.e. a billet re-heating furnace. Physical phenomena involved in combustion within the furnace were complex enough to prefer an empirical black-box modelling of the furnace over a deterministic approach. A 3-week monitoring campaign of fume emissions at the stack was performed; furnace process parameters during the same period were available. The relationship between CO 2 emissions and furnace process parameters could successfully be expressed linearly, while NO 2 emission modelling required a non-linear model. Artificial neural networks modelling revealed a good ability to predict NO 2 and CO 2 emissions.

Research paper thumbnail of A nondestructive method for diagnostic of insulated building walls using infrared thermography

This work deals with the development of an experimental protocol for the diagnostic of multi-laye... more This work deals with the development of an experimental protocol for the diagnostic of multi-layered insulated building walls. First, a test bench is set up in order to measure front and back sides temperatures of standard panels. The panels considered have insulation thicknesses of 2, 6 and 10cm. The front side is heated by two halogen lamps of 500W. A CEDIP Jade Long wave infrared camera and thermocouples are used to carry out temperature measurements. In a second time, a one dimensional model based on thermal quadruples and Laplace transforms was developped under Matlab environment. Also, we developped a three dimensional model based on finite volumes using Fluent computational code. Finally, a method of identification of physical parameters is implemented by performing least square minimization based on Levenberg-Marquardt method. The experimental measurements are compared to theoretical results and by minimization we obtain thermal conductivity and diffusivity as well as thickness of the two layers.

Research paper thumbnail of A simultaneous characterization of thermal conductivity and diffusivity of polymer materials by a periodic method

Journal of Physics D: Applied Physics, 2004

A periodic method is used to determine simultaneously both thermal conductivity and diffusivity o... more A periodic method is used to determine simultaneously both thermal conductivity and diffusivity of various polymer materials at room temperature. The sample is placed between two metallic plates and temperature modulation is applied on the front side of one of the metallic plates. The temperature at the front and rear sides of both plates is measured and the experimental transfer function is calculated. The theoretical thermal heat transfer function is calculated by the quadrupole method. Thermal conductivity and diffusivity are simultaneously identified from both real and imaginary parts of the experimental transfer function. The thermophysical parameters of several polymer samples (PTFE, PVDF and PA11) with different thicknesses (respectively, 5 mm, 2 mm and 300 µm) were studied and compared with values from the literature. The values identified for the thermal parameters are in good agreement with values from the literature for PTFE and PVDF samples; however, we show that the method reaches its limit for the thinner PA11 sample, owing to inadequacy of the thermal model.

Research paper thumbnail of A comparative analysis of dielectric, rheological and thermophysical behaviour of ethylene vinyl acetate/BaTiO 3 composites

Journal of Physics D: Applied Physics, 2008

Dielectric, rheological and thermal behaviours of ethylene vinyl acetate/barium titanate sphere (... more Dielectric, rheological and thermal behaviours of ethylene vinyl acetate/barium titanate sphere (EVA/BaTiO3) composite materials were investigated in this work. Several composites were prepared for different volume concentrations (from 5% to 49%) and for two types of spheres sizes d: d = 9 µm and d = 105 µm. We show that the use of larger particles allows an increase of

Research paper thumbnail of Monitoring acupressure stimulation effects by infrared thermography

Qirt Journal, 2004

Acupressure is a healing therapy that provides stimulation without needle by applying any pressur... more Acupressure is a healing therapy that provides stimulation without needle by applying any pressure to the meridians of traditional Chinese acupuncture (the most important branch of the tTraditional Chinese medicine). This article presents an application of the infrared thermography to the thermal reactivity of Human body skin due to the acupressure stimulation. To survey an in vivo human skin surface,

Research paper thumbnail of Validation of a building thermal model by using ALLAN. Simulation software

Energy and Buildings, 1995

This paper presents the ALLAN.™Simulation software, the modelling approach using this tool and th... more This paper presents the ALLAN.™Simulation software, the modelling approach using this tool and the experimental validation carried out for a dwelling subjected to actual indoor and outdoor conditions. ALLAN. Simulation is a software designed at the Gaz de France Research and Development Division and developed with the aid of the Compagnie d'Ingénierie et de Systèmes Informatiques. It is a general

Research paper thumbnail of Complex Interval Arithmetic Using Polar Form

Reliable Computing, 2006

In this paper, the polar representation of complex numbers is extended to complex polar intervals... more In this paper, the polar representation of complex numbers is extended to complex polar intervals or sectors; detailed algorithms are derived for performing basic arithmetic operations on sectors. While multiplication and division are exactly defined, addition and subtraction are not, and we seek to minimize the pessimism introduced by these operations. Addition is studied as an optimization problem which is analytically solved. The complex interval arithmetic thus defined is illustrated with some numerical examples which show that in many applications, the polar representation is more advisable.