A psychological evaluation method for fluctuating random noise based on fuzzy set theory

The invention relates to a method for evaluating the annoyance of squeaking noises within an audible signal generated during the operation of a motor vehicle or during the operation of one of its components. According to the invention, the existence of at least one squeaking noise is detected, this at least one squeaking noise is evaluated with regard to at least two predetermined characteristics, and a quantity characteristic of the annoyance of this at least one squeaking noise is determined from the at least two evaluations of this at least one squeaking noise.

Method and device for evaluating the annoyance of squeaking noises

A problem of context effects in the case where human beings judge the psychological impression due to a noise stimulus by use of categorized adjective scale, is studied from the viewpoint that the subjective judgment of the impression can be recognized as a fuzzy logical conduct. The authors introduce a model of truth qualification, well known in fuzzy logic, into the process of the subjective judgment so that the behavior of context can be understood ideally and easily. The study based on fuzzy logic is developed into a practical psychological response model including the concept of randomness. The validity of the viewpoint and the usefulness of the proposed response model is examined by a simulation and by actual data on the context effects. Finally, the relationships and the differences between a conventional psychometric method and this study are discussed. >

A study of context effects based on fuzzy logic in the case of psychological impression caused by noise stimulus

Developing a System for Measuring the Membership Functions of Psychological Impressions to Acoustic Noise

The present invention relates to a method for rating the noise of a braking device of a motor vehicle when the vehicle is traveling, comprising the following steps: a step of recording the signals and parameters of the braking noise of the vehicle, which comprises, for each actuation (i) of the braking device, measuring the maximum level of the acoustic pressure and the duration of the noise, and determining partial ratings CPN (i) and CPD (i) depending on the values measured in accordance with predetermined rules, and at the end of travel, determining the mean of the individual partial ratings CPN (i) and CPD (i); a step of determining a third partial rating CPO, which is based on the occurrence of the noise; and a step of overall rating taking the various partial ratings into account

Method for rating the noise of the brakes of a motor vehicle

An opinion that the psychological impression caused by noise exposure can be regarded as a fuzzy event is first shown, based on the information obtained from an actual psychological experiment. That is, the psychological impression is essentially subjective and originally includes fuzziness. The above subjective psychological impression is grasped quantitatively by using the so‐called membership function in the field of fuzzy set theory. Next, a new systematical method for estimating and/or predicting the psychological impression is proposed, in the case when the persons are exposed to the fluctuating random noise of arbitrary probability distribution type. Finally, the validity and usefulness of the proposed method are confirmed experimentally by applying it to the actually observed data for road traffic noise.

Shizuma Yamaguchi

Papers

A systematical study for psychological impression caused by fluctuating random noise based on fuzzy set theory