Methoden und Analyse der technischen und psychoakustischen Schallemission pneumatischer Komponenten

  • Methods and analysis of technical and psychoacoustic noise of pneumatic components

Waerder, Maximilian; Murrenhoff, Hubertus (Thesis advisor); Schmitz, Katharina (Thesis advisor)

Aachen : Shaker (2021)
Book, Dissertation / PhD Thesis

In: Reihe Fluidtechnik. D 107
Page(s)/Article-Nr.: vi, 127 Seiten : Illustrationen, Diagramme

Dissertation, RWTH Aachen University, 2020

Abstract

Pneumatic drive technology is characterized by cost-efficiency and robustness. The major advantage lies in the realization of linear movements with medium-range force requirements. Due to the use of pressurized air as the medium of energy transport there is the inherent disadvantage of noise emission yet. Usually, the typical exhaust noise which is exciting the surrounding air volume is described as loud and annoying. This work intents to enhance the understanding and the analysis of this noise emission in order to optimize the perceived sound. Thus, it should be influenced to reach the statutory thresholds as well as the subjective noise perception without impairing the dynamic properties of the system. For this purpose, the relevant technical and psychoacoustic parameters and models are introduced and discussed firstly. Subsequently, the reasons for noise generation and possible transfer mechanism in pneumatic systems are derived and evaluated by the means of current noise reduction approaches. Based on those findings different methodologies for the analysis of pneumatic component and system noise emission are described, performed and validated. Besides analytical methods also numerical computational fluid dynamics, vibroacoustic analysis and measurements are conducted. Existing noise measurements standards build the foundation for the development of three different acoustic test bench designs. The measurements not only lead to the scientific knowledge gained but also validate the analytic and numerical approaches. Due to shown anomalies of certain measurement results an adapted model of the psychoacoustic parameter sharpness is developed and validated. Finally, the conducted methodologies are compared to each other in terms of applicability, efficiency and possible barriers for pneumatic noise assessment. Thus, this work provides a guideline for the systematic noise analysis of pneumatic components taking technical and psychoacoustic constraints into account.

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