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Combined Shock and Vibration Isolation
Shock perturbations excite all resonances in an isolated system. Therefore a shock isolation system must be designed to dissipate considerable amounts of energy. This can be done by incorporating a sizeable amount of damping into the isolation system. The issue with increasing damping is that it is detrimental to the vibration isolation effectiveness. DEICON has resolved this issue by incorporating ‘damping on demand’ into its “Computer Controlled Air Isolation Technology” via providing light damping in vibration isolation mode and large amounts of damping during a shock event. In addition to controllable damping, the use of air as the isolation medium enhances both shock and vibration attributes isolation system.
Under certain conditions turbulent eddies and vortices within the flow field of an industrial combustor couples with fluctuating heat release and one (or multiple) acoustic resonant mode(s)/standing-wave(s) of the combustion chamber resulting in pressure pulsations with large amplitudes which can become self-sustaining. This pressure oscillation known as thermoacoustic instability (also known as “combustion-driven oscillation”, “combustion instability”, or “flame instability”) generates a loud, annoying tonal noise. In addition to causing extreme annoyance, combustion instability can result in hardware damage of the combustion system. DEICON offers acoustic damping solution for mitigating combustion instability. This strategy is typically implemented by incorporating tuned acoustic damping into the combustion chamber.
Diesel and gas generators vibration/noise
Vibration caused by diesel (or gas) generators transmitted into their support structure interferes adversely with the operation of sensitive nearby equipment. Moreover, this transmitted vibration causes discomfort and fatigue in humans by exposing them not only to vibration but also to the structure-borne noise caused by that vibration. In addition to its proprietary Computer Controlled Air Isolation System, DEICON offers passive vibration isolation solutions for Diesel and gas generators.
Fans, compressors and pumps
All machines, including fans, compressors and pumps, with some internal rotation has some vibration. This vibration problem is especially severe in reciprocating pumps and compressors. Proper mounting/installation of these machines on elastic support controls their vibration by isolating them from their foundation. DEICON offers a number of shock and vibration isolation solutions that effectively isolates the machine and its foundation from one another.
Wide column spans along with the use of high strength material tend to make modern composite and non-composite floors flexible and oscillatory. Walking (as well as other human activities) can induce high levels of vibration in such floors. When the traditional floor vibration control solutions, such as adding architectural features, mass, and/or stiffness to the floor are either not practical or effective, reactive damping provided by tuned mass dampers (TMDs) are used for quieting vibrating floors. High level of effectiveness, negligible weight penalty and ease of installation make TMDs a cost-effective and non-intrusive vibration control solution for both new and existing floors. The installation of TMDs on existing floors is the least disruptive (to the occupants) of any floor vibration control solution. DEICON offers measurement services for evaluating the vibration attributes of an existing floor followed by design and fabrication of tuned mass dampers for abating floor vibration.
Low frequency(bass) sound absorption in rooms
Traditional bass sound absorbers (bass traps), regardless of their effectiveness have two things in common: 1) large size, and 2) lack of adaptability. An alternative to the use of bass traps DEICON has incorporated a control scheme into a powered subwoofer making the subwoofer to exhibit the same dynamics as that of a bass trap. This patented active sound coloration control solution viewed as an ‘electronic bass trap’ adds acoustic damping to the low-frequency modes of a room and smooth out the frequency response. In addition to a powered subwoofer, the electronic bass trap uses a microphone, and an op-amp circuit. Successful applications in many recording studios, home theaters and listening rooms indicate the effectiveness of the ‘electronic bass trap’ in adding acoustic damping to the low-frequency standing wave(s).
Pressure pulsation (due to the operation of pumps as well as opening and closing of valves when valves), two phase flow of fluid, attached pipes as well as a host of other reasons might cause the piping system to vibration. When the rhythm of the perturbation is close to the natural frequency of the piping system, the vibration level becomes excessive capable of damaging/fatiguing the piping system. DEICON designs and fabricates both tuned mass dampers and viscous dampers, for quieting the vibration of piping systems.
Pressure pulsation in pipes
Some pumps, e.g. positive displacement pumps, create a sizeable flow pulsation which in turn create a pressure pulsation in the piping system downstream of the pump. This pressure pulsation causes undesirable oscillation in the pipework. DEICON engineers pulsation absorbers tuned to a pulsation frequency. As long as the rpm of the pump is not varying with time, QWTs are the most straightforward absorption treatment for pump pulsation.
Precision devices such as coordinate measuring machines (CMMs), microscopes, MRI machines, and other test/scanning equipment are highly sensitive to vibration and shock inputs, caused by other nearby equipment or even human activities. The adverse effects of vibration/shock on such devices should be mitigated by properly isolating them from the surrounding via elastically mounting them on their support structure, reducing the transmission of floor vibration/shock to within the machine’s acceptable limits provided by the manufacturer. DEICON’s proprietary Computer Controlled Air Isolation System, capable of a) addressing the conflicting requirements of shock and vibration isolation and b) providing soft isolation is ideal for mounting sensitive machinery and equipment.
Transformers noise and vibration
When transformers are either rigidly attached to their support structure or the resilience of the material isolating a transformer from its support structure is diminished, the vibration caused by coil magnetostriction transmits to the support structure and finds its way in neighboring spaces. The transmitted vibration manifests itself mainly as an annoying, tiring, tonal noise (and sometime vibration). This structure-borne noise issue can be addressed by isolating the core and coils of transformers from their support structure, using proper vibration isolation systems. DEICON offers a number of vibration isolation solutions including, but not limited to, self-leveling air isolation, to mitigate the transmission of transformer vibration.