This study investigated the human subjective response to steering wheel vibration of the type caused by a four-cylinder diesel engine idle in passenger cars. Vibrotactile perception was assessed using sinusoidal amplitude-modulated vibratory stimuli of constant energy level (r.m.s. acceleration, 0.41 m/s 2) having a carrier frequency of 26 Hz (i.e. engine firing frequency) and modulation frequency of 6.5 Hz (half-order engine harmonic). Evaluations of seven levels of modulation depth parameter m (0.0, 0.1, 0.2, 0.4, 0.6, 0.8, and 1.0) were performed in order to define the growth function of human perceived disturbance as a function of amplitude modulation depth. Two semantic descriptors were used (unpleasantness and roughness) and two test methods (the Thurstone paired-comparison method and the Borg CR-10 direct evaluation scale) for a total of four tests. Each test was performed using an independent group of 25 individuals. The results suggest that there is a critical value of modulation depth m = 0.2 below which human subjects do not perceive differences in amplitude modulation and above which the stimulus-response relationship increases monotonically with a power function. The Stevens power exponents suggest that the perceived unpleasantness is non-linearly dependent on modulation depth m with an exponent greater than 1 and that the perceived roughness is dependent with an exponent close to unity.


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    Title :

    Human subjective response to steering wheel vibration caused by diesel engine idle


    Contributors:


    Publication date :

    2005


    Size :

    12 Seiten, 33 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English






    Human subjective response to steering wheel vibration caused by diesel engine idle

    Ajovalasit,M. / Giacomin,J. / Univ.of Sheffield,GB | Automotive engineering | 2005


    Human perception of diesel engine idle vibration

    Giacomin,J. / Ajovalasit,M. / Univ.of Sheffield,GB | Automotive engineering | 2004


    Analysis of variations in diesel engine idle vibration

    Ajovalasit, M / Giacomin, J | SAGE Publications | 2003