Abstract
It is well-known that the reduction of noise levels is not strictly linked to the reduction of noise annoyance. Even earthmoving machine manufacturers are facing the problem of customer complaints concerning the noise quality of their machines with increasing frequency. Unfortunately, all the studies geared to the understanding of the relationship between multidimensional characteristics of noise signals and the auditory perception of annoyance require repeated sessions of jury listening tests, which are time-consuming. In this respect, an annoyance prediction model was developed for compact loaders to assess the annoyance sensation perceived by operators at their workplaces without repeating the full sound quality assessment but using objective parameters only. This paper aims at verifying the feasibility of the developed annoyance prediction model when applied to other kinds of earthmoving machines. For this purpose, an experimental investigation was performed on five earthmoving machines, different in type, dimension, and engine mechanical power, and the annoyance predicted by the numerical model was compared to the annoyance given by subjective listening tests. The results were evaluated by means of the squared value of the correlation coefficient, R2, and they confirm the possible applicability of the model to other kinds of machines.
Highlights
It has been proved that sound levels, sound pressure, or even sound power, properly weighted, are not able to assess the annoyance that a sound may generate [1]
This paper aims at verifying the feasibility of the developed annoyance prediction model when applied to other kinds of earthmoving machines
This paper reports the results of a study aimed at verifying the feasibility of an annoyance prediction model developed for compact loaders when applied to other kinds of earth moving machines
Summary
It has been proved that sound levels, sound pressure, or even sound power, properly weighted, are not able to assess the annoyance that a sound may generate [1]. Results highlighted that the loudness JND becomes greater as the overall sound pressure level of the signal increases, while the sharpness JND has very small variations related to the overall level [8] All of these studies followed the “product sound quality” approach that, very powerful in relating the physical characteristics of the noise to the auditory perception of annoyance, requires repeated sessions of jury listening tests, which are time-consuming [9,10,11,12]. The several experiments and analyses performed in order to validate this thesis are extensively reported
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