NVH - Noise, Vibration, and Harshness

What is NVH?

Noise, Vibration, and Harshness (NVH) refers to the engineering process of controlling and optimizing noise and vibration characteristics for improved operator comfort and perception. Originally associated with the automotive industry, NVH is now a key consideration across various industries.

Where is NVH Used?

Though NVH originated in the automotive sector, where it focuses on minimizing the noise and vibration felt by drivers, its applications extend to other industries that prioritize comfort and user experience, such as manufacturing and heavy machinery.

How Do Noise, Vibration, and Harshness Work Together?

Noise and vibration are intricately connected. To improve the perception of noise and vibration, both need to be modified. Sound frequencies between 20Hz and 20kHz are audible, especially when emitted from vibrating surfaces. By adjusting vibration, we can control both noise and harshness. This is particularly useful for managing road, wind, and mechanical noises in vehicles.

When is NVH Refinement Challenging?

In the automotive industry, the car design and development process prioritizes certain engineering areas, typically in this order:

Styling
Aerodynamics
Ride and Comfort
Powertrain
Other areas with less focus on performance

If the NVH isn't optimal, changes can only occur if higher-priority departments allow it. Otherwise, external devices like exhaust attenuators may be added to modify the sound. However, this is a less efficient solution—complex, time-consuming, and costly.

How Do We Help Our Customers with NVH?

While NVH is often associated with the automotive industry, its applications span across various fields. Our research into vibration and noise radiation has enabled us to prioritize operator comfort by identifying key design parameters to optimize NVH in products and designs.

Many machines and equipment expose operators to harsh environments, which can be engineered from the outset to improve comfort and reduce discomfort.

Research and Case Studies

Truck Cab Refinement: We’ve conducted research to identify design parameters that influence noise and vibration quality in truck cabs.
Electric Power Steering Unit: Using Finite Element Modelling, we refined an electric power steering unit for cars, achieving optimal sound levels.

Further Information

As a mechanical engineering consultancy specializing in vibration and noise management, we can help you achieve the ideal NVH characteristics for your products.

To learn more about how we can enhance noise, vibration, and harshness control in your designs, reach out via email or phone. We’re here to assist you in achieving the perfect balance for your final product.