Relationship between Hand-arm Vibrations and subjective evaluation by a Magnitude Estimation Method : one or both hands excitation
* Presenting author
Steering wheel vibration is one of the factors determining the comfort in a driving car experience. This current study aims at characterizing discomfort induced by steering-wheel vibration in terms of frequency, level and direction. Measurements were realized with seven cars of different sizes and motorizations. That study showed that the maximum level of vibration was related to the first steering column resonance, occurring between 30 and 50 Hz; vibration levels was determined between 0.3 and 5 m.s-2. Then a magnitude estimation experience was conducted to relate the perceived intensity to the steering wheel physical vibration. Two directions were investigated : along the arm and in the normal direction of the palm. 34 subjects participated to the experiment. The relation fits Steven's law; the exponent varied from 1.1 and 1.6, depending on frequency and direction of the excitation. Part of the experience was also to quantify the difference on perception of intensity introduce by one or both hands on the steering wheel.