The greater consumer demand for comfort calls for more advanced air spring systems. To address the downsides of coil springs in bracket applications – their high resonance responses and the inability to provide a tunable support for radial deflections and excitations – Vibracoustic engineers created an alternative rubber mounting system including bellow-style bushings and bump stops. Thanks to the compound used the solution reaches required stiffness levels while damping both radial and axial excitations. The ‘roll-over’ bellow design allows for high displacement at low strain levels, mimicking the performance of springs.
The rubber compound demonstrates a dynamic stiffness peak that is up to 60 per cent lower than solutions with a coil spring which provides a further benefit for the NVH performance.
Furthermore, a snap-fit connection secures ease of assembly for OEMs. The team also improved the bracket itself, switching from metal to plastic. This provides damping to further improve system NVH and eliminate aggressive resonance while also leading to weight savings.
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.