Bus & Coach

Ventac is an established name in the supply of innovative and high-performance noise control solutions to the global Bus & Coach industry. Our experience, technical knowledge and acoustic expertise allows us to work in partnership with our clients to quickly identify and solve their noise control problems with a solution that is guaranteed to deliver an effective result.

The Commercial Vehicles industry is a challenging and ever-changing environment. Ventac, as a well-known provider of noise control solutions to the industry, can assist manufacturers in meeting these challenges. Our process allows us to supply fast and effective solutions that address the needs and demands of our customers and their markets.

Ventac commercial vehicle bus

Quiet Comfort Guaranteed

Providing a comfortable travel environment in the form of a quiet and controllable temperature cabin is a key determinant in achieving a positive customer experience on all public service vehicles, such as urban commuter buses, intercity and touring coaches. Moreover, improved comfort also contributes to the level of driver contentment and reduces occupational fatigue, thus improving safety and awareness.

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.

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.

Ventac vehicle noise graphic forklift

Use your mouse to click sections to see a detailed version of the vehicle and areas where Ventac's vehicle noise control can help

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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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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Noise Control Solutions

The Bus & Coach industry is heavily influenced by legislation, environmental demands, occupational health & safety and passenger comfort. Ventac is the market leader in the identification and supply of high performance acoustic solutions that meet the needs and requirements of the most demanding applications.

Developing Solutions Through Collaboration

"At Ventac, we supply our customers with collaboratively developed noise insulation packages that increase the comfort of their vehicles.

We combine our years of applied vehicle acoustics experience with our wealth of material knowledge and integration focused design to supply our customers with series solutions that are designed specifically for their products.

While our solutions are different for each application, the outcome is not; OEMs thoroughly satisfied with quieter, more comfortable cabins that convey superior product quality and an exceptional attentiveness to their customer’s experience.

What follows are long term development partnerships between Ventac and the manufacturer, as they prosper first-hand from the commercial advantage of quietly satisfied customers."
Ian McDevitt
Head of Innovation

Contact us to discuss a noise control solution.

Our Process

Vehicle Acoustic Test Program

In order to provide efficient and effective solutions suited to our customers’ needs, Ventac completes a Vehicle Acoustic Test Program for all new projects. The program begins with a thorough vehicle assessment conducted by a member of our acoustic engineers using state of the art equipment, such as our noise finding acoustic camera. This step enables Ventac to develop a complete understanding of our customer’s vehicles and their goals when tailoring a noise control solution.

Material Selection

This process, supported by our on-site acoustic testing facilities allows Ventac to select a fine-tuned material composite and bespoke solution which has been designed to effectively reduce the noise within the vehicle. We can typically complete a Vehicle Testing Program in 1-2 days, which is then followed by a full acoustic report and solution.

Performance Validation

Our materials are performance validated within our Innovation & Acoustic Laboratories to confirm that they will withstand demanding and extreme environments. Besides acoustic effectiveness, we also ensure that our products can withstand high temperatures, oil, water and fuel resistance as well as high flame resistance in line with strict industry regulations.

Industry Focused Acoustic Solutions

Ventac supply a wide range of acoustic solutions as assembly ready kits or prototype solutions for vehicle testing and development. Using our innovative material composite expertise and thermal acoustic solutions, our products are guaranteed to provide an effective result for even the most demanding environments and applications.

Because our process offers an on-site acoustic analysis and sound measurement of our client’s vehicles, we can offer comprehensive technical knowledge and a solution that will guarantee both the effectiveness of the materials and the overall acoustic result that fit all the requirements of the customer. Ventac solutions are fine-tuned to suit the specific sounds and frequencies emitted from the vehicle to guarantee an effective result.

Contact Us

Ventac can offer consultancy advice on best design as part of the Vehicle Acoustic Test Program to aid our client’s in understanding the sound pathways throughout the machinery. Such analysis is conducted with the use of our Acoustic Technologies for the visualization and hearing of sound.
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