Light Vehicle Products | Dampers & Decoupling Systems

Encapsulated eCompressor Bracket

The sound and excitations of auxiliary systems are easily masked in combustion-powered vehicles. In BEVs, however, systems like electric refrigerant compressors (eCompressors) are much more noticeable. The Encapsulated eCompressor Bracket is a novel solution that encloses the eCompressor and mitigates a broad range of unwanted noises and excitations.

The sound and excitations of auxiliary systems are easily masked in combustion-powered vehicles. In BEVs, however, systems like eCompressors are much more noticeable.

Taking a holistic approach, Vibracoustic’s engineers identified a broad range of unwanted frequencies caused by the e-motor and the compression device within the eCompressor. These caused both body vibrations and undesired radiated noises – particularly when the vehicle was stationary or recharging.
Alongside significantly improved NVH performance, the system’s plastic bracket allows for better load distribution. Assembly is also simplified with the consolidation of two separate products.

Testing has demonstrated substantial NVH improvements over conventional mounting solutions. This included testing in an anechoic chamber and observations from test engineers. Testing also revealed that complete encapsulation does not lead to thermal issues, instead offering minor improvements to compressor efficiency.

About Dampers & Decoupling Systems

Isolators and mass dampers are ideal for solving a wide variety of vibration-related challenges transmitted into the chassis from the road surface. Linear dampers are a strategic design element to counteract unwanted noise and vibrations – especially in lightweight structures.


Mass dampers are ideal for use in applications where vibrations need to be balanced with opposing inertial forces. In these configurations, an additional spring-mass system with the same frequency, but opposite amplitude, acts on the vibrating structure, effectively eliminating its vibrations. The way mass dampers work means they can be used in a wide variety of scenarios: transmissions, steering wheels, and even whole convertibles are just some of the applications that make use of this indispensable system to prevent Noise, Vibration and Harshness issues.

Active mass dampers are another way of improving comfort even further. They use a sensor placed on the vibrating structure and an ECU (Electric Control Unit) that controls a solenoid which is able to accelerate the absorber mass. This way, active mass dampers not only come with a design that weighs less and takes up less space than their conventional counterparts, but they are also able to adjust to variables such as additional cargo load, road surface excitation, and temperature.

Decoupling solutions for auxiliary components can address new NVH challenges especially in electric vehicles. Here auxiliary systems like coolers, pumps and compressors are not belt-driven anymore and auxiliary noise and vibrations are significantly more noticeable due to the lack of the masking noises of the combustion engine.