The Challenge

There is a constant pursuit of improved passenger comfort in buses and coaches. One of the comfort elements is undoubtedly the noise level in the vehicles. Newer materials are used in the construction of the vehicle, also in the partition between the engine bay and the passenger compartment. The challenge for the Ventac was to reduce the noise levels inside the vehicle to obtain a higher comfort for the coach passengers. The approach Ventac took was to assess the vehicle under a number of operating conditions including static, dynamic and under load. During these measurements the key noise sources were identified and the path of each source into the passenger compartment was determined.

WHY VENTAC

At Ventac, we are committed to delivering exceptional service and technical expertise to all of our international clients. Reliability, expertise and exceptional customer service is at the core of Ventac and our expertise and knowledge of the Vehicle and Industrial Noise Control markets ensures we can provide high performance acoustic solutions for every application.

To achieve an acceptable interior noise level, Ventac Ventac were the ideal partner to develop such a solution given their extensive vehicle acoustic expertise and experience, their testing and research laboratories and their in-depth knowledge of the latest acoustic materials.

Ventac’s vehicle noise solutions are designed to employ the best principles of acoustics to maximise the reduction of airborne noise radiated and are typically used in conjunction with vibration mounts that treat structure-borne noise. Multiple noise source location and identification techniques were used, including sound intensity measurements, noise mapping and FFT analysis. By triangulating these techniques a comprehensive picture could be the developed of the noise propagation through the bus in several operating conditions. This allowed us to target noise control materials on the critical areas. To achieve this, new and innovative designs were required to treat certain locations such as the axle. By treating this critical location at source a significant reduction was achieved with the use of a minimal quantity of materials.