Machines cause vibrations and noise – usually undesirable, but often unavoidable. These emissions are often referred to as NVH – Noise, Vibration Harshness – and can become a problem not only in terms of worker protection legislation, but also in terms of product quality and machine life. NVH is becoming more and more relevant as a result of the constant quest for greater efficiency and the associated higher workload.
With the help of numerical simulation, the vibroacoustic behavior can be precisely analyzed and improved on the basis of structure-borne noise, i.e. structural vibrations. Compared to tests with physical prototypes, not only time and costs can be saved, but also more accurate results can be achieved and more variants tested. Based on the results, effective vibration and noise minimization measures can then be developed.
- Identification of the sound radiating components
- Evaluation of model variants for design optimization
- Examination and interpretation of mitigation measures, and
- Optimization of the operating behavior
Basically, NVH is relevant in almost all industries. Typical fields of application for simulations in this area are drive technology and mechanical engineering. As an illustrative example, tonalities, i.e. individual frequencies that can be heard as tones within a sound, are particularly problematic in wind energy. These are penalized with a surcharge on the total sound power level and thus often lead to yield losses.
- Elastic modelling of the components involved
- Simulation of structure-borne noise and radiation behavior
- Subsequent simulation of the airborne sound by modelling and calculation of the air elements
- Extrapolation to reference point and evaluation of the influences on the total sound level
Bei Fahrrädern mit Trommelbremse für den niederländischen Markt wurde verstärkt Bremsenquietschen beanstandet. Unsere Aufgabe war es, die Ursache zu identifizieren und Vorschläge zur Produktverbesserung zu erarbeiten.
Die Lösung schwieriger akustischer und schwingungstechnischer Probleme erfordert meist den kombinierten Einsatz von Messtechnik und Simulation.