Automotive, and off-highway vehicles
We address areas of concern related to vibration, noise, structural dynamics and fatigue. These are areas in which we are very experienced.
- fatigue testing of automotive components using servo hydraulic equipment
- Recording structural vibration data using electro-mechanical transducers, strain gauges and data acquisition equipment.
- Modal testing to update finite element models of automotive assemblies. Like car chassis, engines, gearboxes, drive lines, engine components, exhaust systems etc.
- improve the design of various components to meet design intent.
- improved quality processes for automotive companies. To reduce their environmental impact . And to save revenue by making the process more efficient by reducing defects.
With the advent of the electric car, most people do not see the benefit to people and the environment of the above-mentioned. But, this experience and knowledge is more important than ever, as more noises and rattles are audible in quieter vehicles. And is harder to mask from the driver and passenger than for an internal combustion engined car.
As mechanical engineers and acousticians, we have limited naval architecture knowledge. But, we reduce unwanted sounds and noise in sea faring vessels. And we're valued for mitigating or resolving vibration problems.
There are several vibration and noise sources within a powered sea going vessel. The predominant sources are the propellers and the power units. These sources can send vibration throughout the hull. This vibration is structure-borne, and radiates from the hull surfaces throughout the vessel.
Here our experience in refining and improving living spaces plays a fundamental role. We focus on the source, the person adn the environment in which the person lives. We address all three entities to find an optimal solution for unwanted sounds.
Incorporated in our work experience on ships, boats and yachts , are:
- bulkhead buckling load
- strain gauging and measuring strain to verify with finite element results
- vibration measurements to understand structural dynamics of the vessel
- noise transmission reduction by vibration control and structural modifications
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With industrial machinery, we perform assessments and measurements to establish a transfer path from the vibration to where the noise is emanating. Once identified, we mitigate the vibration source through design, by manipulating the structrual behaviour. Read more on vibration control
- noise and
- patent in diesel after treatment diesel particulate filter
- modal testing and structural dynamics
During the Covid-19 pandemic, less people are on the roads and in the cities. Hence, the background noise levels were lower than usual.
With the background levels lower than usual, noise consultants have identified that conventional mitigation measures were often not sufficiently effective during the lock-down. For this reason, more affective mitigation measures are required.
In such cases, we focus on the source. As, on a construction site, the sources come from the construction equipment. We modify and improve the construction equipment, so that the equipment radiates less noise. And the construction site levels stays below the regulations threshold limit.
Residentail and industrial
We perform noise surveys in rural, residential and industrial areas. Noise assessments are usually requested by local authorities. And are requested for a variety of reasons. Mainly, because of concerns to the surrounding area.
We document in a report our findings according to industrial standards. And submit the report to the local enforcement agency or council. Within these reports, we provide practical and cost effective mitigation measures.
We perform survesya and assessments by using industrial standards like
We provide advice on reducing the noise. If permitted to do so, we'll improve the product from which the noise is emanating.
High way noise assessments to support and in line with the Design Manual for Roads and Bridges LA 111. Updated from HD 213/11 and IAN 185/ 15).
We can consult on mitigation measures, like landscape features to barriers
You may be entitled to sound insulation, if a new railway is effecting the noise quality in your property. by performing a noise survey according to BS 8233:2014, we are able to determine the level of noise break-in. The noise that enters your home.
We'll consult on various mitigation measures. Like landscape features, noise barriers, fences, noise insulated windows and noise insulation.
Aircraft or aviation
Airports in the UK control the noise levels to some extent. This includes noise limits and restrictions on flights during the night time. And flight paths are generally planned to pass over the less populated areas.
Some airports operate grant schemes to install sound insulation in affected homes. Contact the airport that affects you to find out if they do have a sound insulation scheme. For more information on plane noise, contact the Civil Aviation Authority (CAA). As they monitor some airports 24 hours, 7 days a week.
Furthermore, we have extensive experience relating to design, development and testing in aerospace. Like vibration analysis, modal analysis jet turbines.
We've conducted environmental testing on various components, systems and assemblies. Our work, included vibration, shock, temperature testing etc., was on the following airframes:
- Airbus A350XWB
- Airbus A380
- Airbus A400M
- Boeing 787
- Bombardier Global express
- Dassault Falcon 7X
- Sikorsky CH53K
- Typhoon or Eurofighter
- V22 Osprey and more
Improved several components, i.e. electronic assemblies to survive in extreme environments.
Wind farm & turbine
At a distance of 350m, the noise generated by a wind turbine is usually between 35 - 45dB(A). The noise is limited to 5dB(A) above the background noise for both day- and night-time. Remembering that the background level of each period may be different.
A fixed limit of 43 dB(A) for night-time is recommended. This is based on a sleep disturbance criteria of 35 dB(A). With an allowance of 10 dB(A) for attenuation through an open window (free field to internal). And 2 dB(A) subtracted to account for the use of LA90,10min rather than LAeq, 10min.
Sounds, other than that of the wind passing over the wind turbine blades, could relate to the turbine alternator. We would conduct signal processing of the recorded data to identify the source. And match it with the vibration content of the mechanical and electrical system within.
During night-time, a fixed limit of 43 dB(A) is acceptable. And is based on a sleep disturbance criteria of 35 dB(A).
We perform assessments and surveys according to ETSU-R-97 and PPS 18.
To read more on mitigation through vibration control, click here.
At the advent of the wind turbine, gear meshing noise emanated from the aerofoil blades. The near flat surfaces of the blades acted a diaphragms of loudspeakers. And the gear meshing noise was heard miles away.
Our priority lies with tackling the source of the noise. Which is the most effective way to mitigate and reduce noise from the vibration source.
There are a few ways in which one can mitigate this emanating gear meshing noise.
- isolate the blades from the man shaft of the gearbox
- address the gear meshing vibration by improving the macro and micro geometry of the gear profile. This will allow more smooth engagement of the gears and less impact sounds
- ensure gear alignment, by optimising the design to keep the shafts parallel under torque loading
To read more on mitigation through vibration control, click here.