Analysis & Consulting Services
Our consulting services enable faster implementation of custom noise and vibration countermeasures. Partner with us on your next noise or vibration project and gain the competitive advantage DTI brings to your team.
Extensive VEM Library& Predictive Analytics
Our proprietary, bleeding edge analytical tools and extensive VEM library allows us to rapidly develop a solution for any environment.
The Leading Minds in Passive Damping
DTI's engineers, polymer chemists, and technicians are counted among the industry's top authorities on noise and vibration countermeasures.
PerformanceDriven by Experience
Our solutions are tuned for exceptional performance following methods honed from hundreds of projects over our 30+ year history.
SERVICES
Deep knowledge of structural dynamics is at the heart of what we do. DTI’s engineers have extensive knowledge of how to model structural behavior and are skilled in identifying and solving the root cause of noise and vibration issues.
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We use FEA modeling to predict how a product reacts to real-world forces, temperature, and environment. This allows us to rapidly assess various potential noise control solutions and identify the best one for your specific application.
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Rely on DTI’s industry expertise and vast library of viscoelastic materials properties to design a damping system tailored to meet your specific needs.
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In addition to damping countermeasures, the mass and stiffness contribute to the overall performance of your structure. We can modify damping solutions to optimize stiffness levels.
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While predictive modelling (like FEA) has become more accurate and dependable in recent years, DTI can validate damping solutions with real-world experimental testing. This ensures optimal performance in the environment and conditions in which the product will operate.
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Although adding mass alone will help damping properties, DTI’s application-specific solutions improve damping performance while keeping the product as light as possible. In addition, it is important to design the damping system to support your operating temperature range. DTI optimizes the design for peak performance at the operating temperature. DTI can optimize a damping solution for the perfect balance of exceptional performance, weight, and operating conditions.
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CASE STUDY: ROTORCRAFT
Rotorcraft typically tend to exhibit considerably more noise and vibration than jet or even turbo prop aircraft. Rotorcraft are exposed to excessive forced-vibration from the aircraft rotor rotation (i.e. blade pass) as well as from transmission gear mesh. Sometimes the frequency of these forcing function events will coincide with resonances of the fuselage skin and frames/stringers, creating excessive noise and vibration.
To correct this, a detailed analysis of the forcing function and structural dynamics of the aircraft is required to develop effective countermeasure strategies.
A passive damping system will be ineffective if resonance response does not contribute to the unwanted noise and vibration. In the case of rotor blade-pass forced-vibration, the frequency content of the forcing function will tend to occur below resonance frequencies of the fuselage skin or fuselage structure. However, this may not be the case with forcing function emanating from transmission gear sets.
Because of this, DTI has determined the combination of a SODS + TVA Array to be a powerful noise and vibration attenuation methodology for rotorcraft applications.
DTI’s Stand-Off Damping System (SODS) technology can be beneficial in the stiffness region to contend with frequencies below structural resonances, since the Stand-Off Layer – due to its “box-like” construction – adds significant stiffness to the fuselage skin structure, which is being forced.
DTI’s TVA Array countermeasure consists of a large number of relatively small TVAs which are tuned to blade-pass frequency, transmission gear-mesh frequency or harmonics thereof. The TVA array is mounted to high-response fuselage skin panels and other fuselage structure.
DTI has enabled the TVA Array countermeasure via careful control over TVA elastomer formulation as well as TVA injection mold process. DTI TVAs require no hand-tuning; therefore, the TVA units can be produced in large quantities at affordable costs. Some applications utilize up to 135 TVAs in the array.
DTI’s combination of a SODS + TVA Array proved to be powerful noise and vibration solution for rotorcraft applications.
DTI also utilizes De-Coupled Mass (DCM) Acoustic Barrier Technology in cases where there is substantial forced-vibration (high-frequency gear-mesh) and/or resonance response.
In the rotorcraft application, this may involve application of the DCM to the rear surface of aircraft trim panels. Effectiveness will depend on the frequency content of the noise.
