NVH Optimization in Mobile Hydraulics – Understanding and Controlling Pressure Pulsations

Complex operating conditions, legal requirements, and the need for spontaneous decisions make complete autonomy of agricultural and construction machinery unrealistic at present. However, semi-automated systems often take over the execution, with overall control and responsibility remaining with humans. Despite all the advances in automation, the machine operator therefore remains the central figure, which is precisely why acoustic comfort in the driver's cab is becoming increasingly important.

NVH optimization (noise, vibration, harshness) is therefore becoming a decisive quality feature in machine development – technically, ergonomically, and economically. Noise and vibrations affect concentration, lead to increased fatigue and can have long-term health consequences. 
In addition, noise emissions to the outside are also coming under greater scrutiny. Low noise emissions are a must, especially in sensitive areas of application, such as in cities or during night work.

From Pressure Pulse to Sound Source – Designing Hydraulic Systems to Meet NVH Requirements

Increasing reduction of noise on the drive side – for example, through quieter motors or electrification – means that hydraulic noises are no longer masked as they used to be. These noises are now more clearly audible and the effect is further amplified by ever-higher power densities and increasing system dynamics. In addition, pipe layouts are becoming increasingly compact and complex, making resonances in piping systems more likely. This results in structural excitation and airborne noise emissions, which have a significant impact on the overall NVH impression..

Getting Noise and Vibration Problems Under Control – FLUIDON Solutions for NVH-Optimized Hydraulics

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• NVH analysis with DSHplus:
  With our DSHplus simulation software and its 1D CFD Piping Systems Library, we analyze pressure pulsations and dynamic processes in the hydraulic piping systems of your mobile machines. This enables us to identify specific causes of vibration, critical frequencies, and the positions of dynamic​​​​​​ pressure changes (pressure surges) – the basis for a sound NVH assessment even in the early development phase.The section on pressure oscillation analysis in our knowledge database provides an insight into our methodological approach.
• Force evaluation using simplified FSI:
  Based on a one-sided fluid-structure interaction, we calculate the forces acting on pipe bends, brackets, and screw connections. This simplified FSI enables efficient estimation of structural excitations before airborne or structure-borne noise emissions occur.
• Systematic NVH optimization with Cube:
  In our Cube cloud environment, we automatically compare variants and run optimization processes. This allows us to evaluate different pipe layouts, damping concepts, and mounting strategies at an early stage with the aim of significantly reducing noise, vibrations, and mechanical stress..

Your Advantages – NVH Optimization with FLUIDON

For years, we have been successfully supporting our customers in analyzing pressure pulsations and acoustically critical operating conditions in hydraulic pipe systems. Together, we create the basis for practical solutions.

What's in it for you?:

• Reliable simulation: Identification and evaluation of NVH-relevant effects – fast and reliable
• Proven cooperation: Your system knowledge meets our simulation expertise
• More peace and quiet in the system: Optimized ducting concepts improve the acoustic performance and mechanical stability of your machine.