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Noise

vibration

harshness

Precise analysis of torsional vibrations, valve dynamics and transmission errors for the automotive industry,
energy & mechanical engineering
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Our solutions

NVH

Problem: Crankshaft torsion, clutch slip

Goal: Optimised clutch design

Image NVH time analysis

Analyses in the time domain

Analysing the progression of structure-borne sound signals in the time domain

Correlation between dynamic component movements and noise effects

Root cause analysis of gear rattling or similar problems


Image analyses in the spectral domain Visualisation of the composition of a soundscape Analysis of the individual orders and the overall noise level Analysis of the conspicuousness and dominance of a noise component Detection of resonances Comparison of the noise image at different locations Checking the effectiveness of sound insulation

Analyses in the spectral domain

Visualisation of the composition of background noise 
Analysis of the individual orders and the overall noise level
Analysing the conspicuousness and dominance of a noise component
Detection of resonances
Comparison of  sound characteristics across locations
 Evaluation of sound insulation 

Measurement and evaluation of vibrations

The noise and vibration behaviour of a vehicle (NVH - Noise, Vibration, Harshness) is increasingly becoming the focus of automotive development, as it has a significant influence on driving comfort.

NVH refers to all audible and perceptible vibrations emanating from the chassis, drivetrain and wheels. These can significantly impair the driver's sense of comfort.

Battery-powered electric drives pose a particular challenge here:
As there is no combustion engine to mask the drive noise, it is perceived more clearly - both as structure-borne noise and as airborne noise.

Causes of drive noise

The causes of audible or perceptible drive noises can be various excitations on the drive side caused by

the electric motor

the gearbox

the drive shafts

In addition, component groups can react to these structure-borne noise excitations with natural vibrations and further worsen the NVH behaviour.

Measurement and evaluation of vibrations

 

To measure and evaluate the vibrations

the rotational speeds at the components that excite torsional vibrations are recorded,

structure-borne sound signals are recorded with accelerometers and microphones.

The recorded signals are then analysed together in the order and frequency domains. 

 

For NVH analyses, Rotec boasts:

high-resolution analogue measurement cards with IEPE inputs and

special NVH functions in the analysis software.

The recorded measurement values are evaluated in the time and spectral domain. 

Customised solution required?

ROTEC ENGINEERING offers customised measurement technology solutions and complete project management.
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#FAQs

Frequently Asked Questions

Have Question? We are here to help

What does the ROTEC solution for rotation analysis look like and what does RAS mean?

The ROTEC Rotational Analysis System (RAS) has been used for more than 30 years by users in the mechanical engineering, automotive, power generation and motorsport industries to comprehensively analyse rotating components.

With its unique measurement method using a 12.3 GHz counter card and a strictly angle-based approach to rotational speed detection and analysis, the RAS system offers users an unrivalled advantage.

ROTEC offers not only optical and magnetic speed sensors including signal conditioning adapters, but also the modular measuring system RASdelta as well as specialised and user-friendly software for measurement and analysis. This enables a complete solution from a single source. The ROTEC measurement technology products are perfectly harmonised and deliver meaningful results within a very short time after the uncomplicated setup of the measurement chain.

Thanks to the angle-based approach to speed measurement, problems such as sensor vibrations can be recognised after the first measurement and rectified immediately. This effectively prevents costly incorrect measurements.

Our team of experts at ROTEC ENGINEERING, consisting of long-standing users, will be happy to assist you with challenging tasks.

Are there options for customising the measuring systems and software?

The ROTEC RASdelta front end is a versatile modular measuring system that can be individually configured with 8 or 16 measuring cards to meet your specific measuring requirements.

Our RAS software offers you a comprehensive modular system for analysing rotating components and complex systems. It is an effective tool for mechanical engineers and requires no programming knowledge to perform measurements or analyses.

If you have specific metrological questions, our experienced ROTEC ENGINEERING consulting team will be happy to support you.

Does ROTEC offer other services in addition to the measuring systems, e.g. customised consulting or project support?

ROTEC not only offers speed sensors, signal conditioning, measurement systems (DAQ) and measurement and evaluation software, but also engineering and consulting services.

Our services include the design of measuring points in CAD, the mechanical processing of components, the application and calibration of sensors, the execution of measurement tasks and the evaluation of measurements according to our customers' requirements, including the presentation of the results. The ROTEC ENGINEERING team can also realise sub-projects as part of project support.

Is there training or technical support for commissioning and integrating the measuring systems?

In addition to our annual ROTEC Training Week, which is held in both German and English, we also offer customised training courses for users. These training courses are specially tailored to your individual application of the ROTEC measuring system and include not only the theoretical basics and a detailed presentation of the software, but also practical demo measurements in your environment. This ensures that future users are optimally prepared for your specific application.

Furthermore, we are happy to support you in the commissioning of new measuring systems to enable you to familiarise yourself with the settings and possibilities of the RAS software as quickly as possible.

How is support ensured and are there self-help options?

In addition to our sales and support team in Munich, which serves the Central European market directly from here, ROTEC also cooperates with local partners in many global markets. These partners support local users in all matters relating to ROTEC measurement technology, first-level support and sales enquiries with trained personnel.

Our customers around the world appreciate the proximity of our sales and support teams, as this enables us to guarantee effective support even for short-term questions.

In addition to personal contact, ROTEC also offers an extensive knowledge database for self-help. Please register for our knowledge database to obtain detailed information on measuring and analysing torsional vibrations, transmission errors and valve systems, among other things.