The Experts below are selected from a list of 2103 Experts worldwide ranked by ideXlab platform

Carsten Hoever - One of the best experts on this subject based on the ideXlab platform.

  • The influence of modelling parameters on the simulation of Car Tyre rolling losses and rolling noise
    2012
    Co-Authors: Carsten Hoever
    Abstract:

    Due to legislative changes within the EU there is an increased demand for improvement in Car Tyre rolling resistance and noise generation. Yet, apart from empirical data based on measurements, there is little information concerning the relationship between rolling resistance and rolling noise generation. The purpose of this work is to establish a simulation framework which allows to explore the underlying physical processes connecting both areas. Special emphasis is put on the development of an accurate and efficient condensation procedure for the estimation of the necessary Tyre input data from detailed design data available to the manufacturer. The method is exemplified by the derivation of the input deck for a 175/65 R14 Tyre which was previously not implemented in the modelling tool. For the simulations a waveguide finite element model of the Car Tyre is combined with a non-linear 3D model of the Tyre/road contact to simulate the structural dynamics of a Tyre rolling under steady-state conditions on a real road. Rolling resistance is calculated based on the power input into the Tyre while the velocity field on the Tyre surface is used to determine the radiated sound pressure based on a boundary element method approach. The applicability of the approach is shown by calculating rolling resistance and sound radiation for an initial setup of modelling parameters. In the further course of the study the influence of a variety of modelling parameters on the outcome of the rolling loss and rolling noise simulations is investigated. A number of key parameters for the simulation of one or both of the quantities are identified. It can be shown that especially the contact stiffness and the geometry of the BEM mesh are crucial parameters for the rolling noise simulations. Some remarks on the required quality of Tyre input data are made. Further results show that it is not generally possible to relate variations in input and transfer mobilities to changes of rolling resistance or rolling noise and vice versa.

  • A Simulation-Based Parameter Study of Car Tyre Rolling Losses and Sound Generation
    2012
    Co-Authors: Carsten Hoever, Wolfgang Kropp
    Abstract:

    Due to legislative changes within the EU there is an increased demand for improvements in Car Tyre rolling resistance and noise generation. Apart from measurement data, however, information about the relationship between rolling resistance and rolling noise generation is sCarce. It is the goal of this study to investigate the fundamental physical processes connecting both areas. Additionally, it is evaluated whether a simultaneous reduction of both rolling resistance and rolling noise is possible or if this is contradicting requirement. A previously presented model for simulating the structural dynamics and rolling resistance of a rolling Car Tyre is extended to allow rolling noise calculation. The approach is based on a waveguide finite element model of the Tyre. Tyre/road contact forces are obtained using a non-linear 3D contact model. The velocity field on the Tyre surface is used to determine the radiated sound pressure based on a boundary element method. In a parameter study it is evaluated how much dissipation and sound radiation are affected by material properties, Tyre construction and road surfaces. Due to the characteristics of the modelling approach, detailed information about dissipation and sound generation in different frequency regions, wave orders or parts of the Tyre is available. The results show that rolling resistance and radiation are mainly low wave order, low frequency phenomena which are, at least partly, controlled by the same set of modes. This suggests that by modifying specific Tyre properties reductions in both sound radiation and rolling resistance can be achieved.

  • Waveguide-Finite-Element based parameter study of Car Tyre rolling losses
    2011
    Co-Authors: Carsten Hoever, Patrick Sabiniarz, Wolfgang Kropp
    Abstract:

    Low rolling resistance and a low noise level are two characteristics of a Car Tyre which are often seen as conflicting with each other. Simultaneously, there is an increased demand for improvement in both fields due to legislative changes. Due to the fact that there is little to no detailed information available on the relation between rolling resistance and acoustical behaviour of Car Tyres, an in-depth investigation of this subject seems to be desirable. In a first step, a Waveguide-Finite-Element-Model (WFEM) of a Car Tyre is combined with a non-linear 3D contact model to calculate the resulting contact forces between Tyre and road surface. This can be used to make a detailed prediction of the Tyre vibrations. For steady state rolling the input power into the Tyre at the Tyre-road interface gives the rolling resistance in terms of dissipated power. This includes detailed information on frequency and wave order distribution of dissipation. Using a parameter study, it is evaluated how the rolling resistance is affected by material properties or the Tyre design.

  • Investigation of stress-distribution in a Car Tyre with regards to rolling resistance
    2010
    Co-Authors: Carsten Hoever, Patrick Sabiniarz, Wolfgang Kropp
    Abstract:

    In recent years the method of waveguide finite element modelling has emerged as a suitable tool for the simulation of the structural behaviour of Tyres. It combines cross-sectional finite element modelling with classical wave propagation methods along the waveguide. Compared to traditional finite element methods it is numerically much more efficient and provides greater physical insights into the vibrational behaviour. In an ongoing project an existing waveguide finite element model for the calculation of stationary (non-rolling) Tyre vibrations is extended to allow for calculation of the stress distributions inside a rolling Tyre being in contact with the ground. The results are used to identify local areas of high stress, which are not only important from a structural point of view but which can also be associated with high energy losses due to dissipation, hence affecting the overall rolling resistance of the Tyre. The procedure and preliminary results will be presented.

Wolfgang Kropp - One of the best experts on this subject based on the ideXlab platform.

  • A Simulation-Based Parameter Study of Car Tyre Rolling Losses and Sound Generation
    2012
    Co-Authors: Carsten Hoever, Wolfgang Kropp
    Abstract:

    Due to legislative changes within the EU there is an increased demand for improvements in Car Tyre rolling resistance and noise generation. Apart from measurement data, however, information about the relationship between rolling resistance and rolling noise generation is sCarce. It is the goal of this study to investigate the fundamental physical processes connecting both areas. Additionally, it is evaluated whether a simultaneous reduction of both rolling resistance and rolling noise is possible or if this is contradicting requirement. A previously presented model for simulating the structural dynamics and rolling resistance of a rolling Car Tyre is extended to allow rolling noise calculation. The approach is based on a waveguide finite element model of the Tyre. Tyre/road contact forces are obtained using a non-linear 3D contact model. The velocity field on the Tyre surface is used to determine the radiated sound pressure based on a boundary element method. In a parameter study it is evaluated how much dissipation and sound radiation are affected by material properties, Tyre construction and road surfaces. Due to the characteristics of the modelling approach, detailed information about dissipation and sound generation in different frequency regions, wave orders or parts of the Tyre is available. The results show that rolling resistance and radiation are mainly low wave order, low frequency phenomena which are, at least partly, controlled by the same set of modes. This suggests that by modifying specific Tyre properties reductions in both sound radiation and rolling resistance can be achieved.

  • Waveguide-Finite-Element based parameter study of Car Tyre rolling losses
    2011
    Co-Authors: Carsten Hoever, Patrick Sabiniarz, Wolfgang Kropp
    Abstract:

    Low rolling resistance and a low noise level are two characteristics of a Car Tyre which are often seen as conflicting with each other. Simultaneously, there is an increased demand for improvement in both fields due to legislative changes. Due to the fact that there is little to no detailed information available on the relation between rolling resistance and acoustical behaviour of Car Tyres, an in-depth investigation of this subject seems to be desirable. In a first step, a Waveguide-Finite-Element-Model (WFEM) of a Car Tyre is combined with a non-linear 3D contact model to calculate the resulting contact forces between Tyre and road surface. This can be used to make a detailed prediction of the Tyre vibrations. For steady state rolling the input power into the Tyre at the Tyre-road interface gives the rolling resistance in terms of dissipated power. This includes detailed information on frequency and wave order distribution of dissipation. Using a parameter study, it is evaluated how the rolling resistance is affected by material properties or the Tyre design.

  • Investigation of stress-distribution in a Car Tyre with regards to rolling resistance
    2010
    Co-Authors: Carsten Hoever, Patrick Sabiniarz, Wolfgang Kropp
    Abstract:

    In recent years the method of waveguide finite element modelling has emerged as a suitable tool for the simulation of the structural behaviour of Tyres. It combines cross-sectional finite element modelling with classical wave propagation methods along the waveguide. Compared to traditional finite element methods it is numerically much more efficient and provides greater physical insights into the vibrational behaviour. In an ongoing project an existing waveguide finite element model for the calculation of stationary (non-rolling) Tyre vibrations is extended to allow for calculation of the stress distributions inside a rolling Tyre being in contact with the ground. The results are used to identify local areas of high stress, which are not only important from a structural point of view but which can also be associated with high energy losses due to dissipation, hence affecting the overall rolling resistance of the Tyre. The procedure and preliminary results will be presented.

Liu Xiao - One of the best experts on this subject based on the ideXlab platform.

  • Car Tyre Tyre of Intelligent Monitoring Method Research and Risk Simulation
    Computer Simulation, 2013
    Co-Authors: Liu Xiao
    Abstract:

    Research accurate recognition of automobile tire burst risks.Automobile tire structure is complex and has different degrees of vibration.This paper put forward a tire pressure monitoring method based on support vector machine(SVM).It sets method to collect the value of tire pressure,uses support vector machine method to establish automobile tire pressure abnormal monitoring model,thus fulfills the flat tire monitoring.The experiment results show that the algorithm can improve the accuracy of identification.

Rubia Idris - One of the best experts on this subject based on the ideXlab platform.

  • microwave induced pyrolysis of waste truck Tyres with Carbonaceous susceptor for the production of diesel like fuel
    Journal of The Energy Institute, 2019
    Co-Authors: Rubia Idris, Cheng Tung Chong, Farid Nasir Ani
    Abstract:

    Abstract Microwave-induced pyrolysis technique was utilised to pyrolyse waste truck Tyres (TT) into useful pyrolysis oil with the aid of activated Carbon. The effect of temperature was studied to determine the truck-Tyre pyrolysis oil (TTPO) yield, hydroCarbon fractions, chemicals composition, energy yield and fuel properties. The activated Carbon functions as microwave absorber to elevate the pyrolysis temperature for enhancing production of pyrolysis oil. The optimal pyrolysis temperature of 500 °C produces highest TTPO yield of 38.12 wt% with calorific value of 42.39 MJkg−1 and energy yield of 40.55 wt%. Detailed analysis shows the TTPO contained large amount of aromatic hydroCarbons and limonene (14.29%) compared to pyrolysis oil from personal Car Tyre. Among the important chemical compounds also discovered in TTPO are benzene, toluene, xylene (BTX). The relative yields of toluene obtained at 400 °C is 14.85%, whereas the relative yields of benzene and xylene at 450 °C were 0.85 and 7.60%, respectively. The physiochemical properties of TTPO500 are rather similar to conventional diesel, except the slightly lower flash point and calorific value for the former. This work shows that microwave-induced pyrolysis is a promising technique to recover diesel-like fuel for use as supplemental alternative fuel.

Farid Nasir Ani - One of the best experts on this subject based on the ideXlab platform.

  • microwave induced pyrolysis of waste truck Tyres with Carbonaceous susceptor for the production of diesel like fuel
    Journal of The Energy Institute, 2019
    Co-Authors: Rubia Idris, Cheng Tung Chong, Farid Nasir Ani
    Abstract:

    Abstract Microwave-induced pyrolysis technique was utilised to pyrolyse waste truck Tyres (TT) into useful pyrolysis oil with the aid of activated Carbon. The effect of temperature was studied to determine the truck-Tyre pyrolysis oil (TTPO) yield, hydroCarbon fractions, chemicals composition, energy yield and fuel properties. The activated Carbon functions as microwave absorber to elevate the pyrolysis temperature for enhancing production of pyrolysis oil. The optimal pyrolysis temperature of 500 °C produces highest TTPO yield of 38.12 wt% with calorific value of 42.39 MJkg−1 and energy yield of 40.55 wt%. Detailed analysis shows the TTPO contained large amount of aromatic hydroCarbons and limonene (14.29%) compared to pyrolysis oil from personal Car Tyre. Among the important chemical compounds also discovered in TTPO are benzene, toluene, xylene (BTX). The relative yields of toluene obtained at 400 °C is 14.85%, whereas the relative yields of benzene and xylene at 450 °C were 0.85 and 7.60%, respectively. The physiochemical properties of TTPO500 are rather similar to conventional diesel, except the slightly lower flash point and calorific value for the former. This work shows that microwave-induced pyrolysis is a promising technique to recover diesel-like fuel for use as supplemental alternative fuel.