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Noise Reduction for Bus and Coach

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Ventac is the industry leading expert in delivering a complete vehicle sound insulation package to satisfy the needs of bus and coach applications. We combine decades of experience in vehicle noise control with our in-house technical knowledge of materials, acoustics and design to develop an intimate understanding of your vehicle; only then can Ventac co-engineer and manufacture the tailored solutions that most efficiently deliver cabin comfort levels that will please even the most demanding of customers.

We know that each vehicle has its own unique acoustic challenges, that’s why we design and test bespoke solutions in our specifically designed acoustic lab.

We partner with you to engineer complete noise solutions for your vehicle. We offer:

  • Fast efficient delivery
  • Dedicated turnkey service
  • Custom engineered solutions
  •  Solutions that slot into your production line

Keep reading to find out how you can talk to our noise control specialists today and learn how we can meet your needs.

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Ventac offer our customers unparalleled access to technical and design experts with a performance focus on reducing noise levels, improving sound quality and minimising cabin thermal losses. Ventac are uncompromising on passenger safety, ensuring our materials meet all of your environmental exposure and flammability requirements. Equally, we care about the commercial success of our customers; so we are mindful to provide solutions that minimise the total cost of ownership for your customers with low weight solutions that are cost effective as components, for installation and for service.

Electric Bus Before Vehicle Noise Control

Electric Bus Before

Electric Bus After Vehicle Noise Control

Sound Data with Prominent Tone

Please ensure your speakers are turned on to listen to the tests.

  • Wind Noise

    As intercity bus and coaches travel at speed, wind noise is created around the front of the vehicle and are generally heard as ‘rush’ and ‘whistling’ noises. Wind noise is reduced by minimising exposed edges of on the outside of the vehicle, by sealing gaps and through acoustic glazing and absorptive cavity filling.

  • Cabin Comfort

    The sidewall and road insulation protect the bus cabin for the external environment. Choosing the right material allows the bus manufacturer to create a quiet space within the vehicle and create a more comfortable journey for the passenger away from the sounds of the outside world.

  • Ventilation Noise

    The cabin air is controlled by forcing pressurised air through a series of ducts and outlets by blower fans. If not managed correctly, this air can make the cabin noisy and creates uncomfortable and annoying sounds for the passengers. If air management systems are not installed, mounted or insulated correctly they can lead to a noisy and loud cabin.

  • Emobility Sound Quality

    The public generally expect ‘silent’ electric vehicles; however, when a traditional combustion engine is removed a lot of annoying tonal noises such as axle ‘whine’, hydraulic pump ‘moan’ and air compressor ‘knock’ noises can be heard. Electric motors and power electronics also emitted annoying tonal noises that can decrease the cabin comfort of the vehicle and its higher frequency can be considered a much more unpleasant noise than that emitted from traditional combustion engines. Ventac can develop an entire insulation concept that considers reduced vehicle weight, while also delivering the customers expectation of comfort and noise control.

  • Road Noise

    The interaction between the tyre and the road creates airborne and structure borne noise, and these noise types vary depending on road surface and tyre type. Road noise levels heard within the vehicles can be reduced by installing effective body sealing, combined with Ventac absorptive and insulating materials. Wall panel damping can also be used to reduce road noise.

  • Gear Noise

    The sound quality of a vehicle can be reduced by the ‘whine’, whirr’, ‘rattle’ and ‘clunking’ noises emitted from the vehicles transmission, retarder, axles and other components. Addressing the specific tones and frequencies with the use of Ventac tailor-made material composites and acoustic insulations will reduce overall noise levels, absorb problem frequencies and the reduce sound levels being emitted into the bus cabin, increasing passenger comfort.

  • Environmental Noise

    Exterior noise levels emitted from a commercial vehicle into its surrounding environment are controlled by regulation and legislation noise limits, for example drive-by noise. Complaints from the public and the operator on noise levels of the vehicle can have a negative effect on the brand of the manufacturer. Typically the engine bay and tyre noise are the main noise sources and can be treated using Ventac tuned composite materials.

  • Engine Noise

    Combustion engines produce both low frequency ‘boom’ sounds, combined with a variety of additional frequencies that come from the vehicle combustion, valve-train and injectors. Whilst many absorptive materials are suitable for addressing the higher frequency noises, their performance is often reduced when they are faced with an impermeable layer or thermal treatment. Ventac offer tuned composites, that meet up-to-date regulatory requirements (eg. R118.02), absorb lower frequency range tones and reduce the transmission of general sound and heat into the cabin.

  • Rear Openness

    Rear panels and modules of a bus including the emergency doors allow exterior noise to pass through into the interior of the bus. Noise sources include exhaust, engine and wind noise. This decreases overall cabin comfort for the passenger and reduces the impression of vehicle quality. Ventac can quickly identify these weak-points within the vehicle and identify acoustic treatment options.

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