Abstract
In this study, sound measurements of an axial piston pump and an internal gear pump were performed and subjective pleasantness judgements were collected in listening tests (to analyze the subjective pleasantness), which could be seen as the inverse of the subjective annoyance of hydraulic drives. Pumps are the dominant sound source in hydraulic systems. The noise generation of displacement machines is subject of current research. However, in this research only the sound pressure level (SPL) was considered. Psychoacoustic metrics give new possibilities to analyze the sound of hydraulic drive technology and to improve the sound quality. For this purpose, instrumental measurements of the acoustic and psychoacoustic parameters are evaluated for both pump types. The recorded sounds are played back to the participants in listening tests. Participants evaluate them regarding the subjective pleasantness by means of paired comparison, which is an indirect scaling method. The dependence of the subjective pleasantness on speed and pressure was analyzed for both pump types. Different regression analyses were carried out to predict the subjectively perceived pleasantness or annoyance of the pumps. Results show that a lower speed is the decisive operating parameter for reducing both the SPL and the annoyance of a hydraulic pump.
Highlights
The electrification of mobile machinery is subject of current research
The sound recordings were evaluated in listening tests with regard to pleasantness by participants
The dominant excitation frequencies still correlate with the number of displacers and rotational speed
Summary
The electrification of mobile machinery is subject of current research. Construction machinery manufacturers presented the first electrified mobile work machines in the compact segment [1]. The perception of the annoyance or pleasantness, respectively, of a sound depends especially on its acoustic and psychoacoustic properties. A physical measurement was considered without including the subjective perception or annoyance of the sound in the evaluation. The acoustic and psychoacoustic properties of variable speed hydraulic drives were investigated. The contribution to the subjectively perceived pleasantness or annoyance of the respective hydraulic drive was analyzed. The sound recordings were evaluated in listening tests with regard to pleasantness by participants These subjective assessments of pleasantness were correlated with instrumentally measured acoustic and psychoacoustic sound characteristics. A model for the calculation of the perceived pleasantness or annoyance of hydraulic drives are presented
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