The combustion instability (thermoacoustic instability) of a gas-fired combustor with a low-frequency instability occurring at 100 Hz, was successfully mitigated using DEICON’s passive acoustic radiation based tuned absorber (damping system). Contrary to the more traditional tuned acoustic absorbers (perforated liners, quarter wave tubes, etc.) that are objectionably large at such low frequencies, DEICON’s passive acoustic […]
Read MoreExcessive vibration of three large balconies in a performing art center were dampened using tuned mass dampers (TMDs). Nine TMDs were designed and built for the three balconies (three/balcony) and appended to the vibrating structure at locations where they can most effectively couple with the target mode(s). The TMDs, tuned to the balcony resonant frequencies […]
Read MoreLarge vehicles, such as SUVs (Sport Utility Vehicle) and minivans, exhibit body boom phenomena during multiple source excitation events including rough road/impact and powertrain induced events. The main cause of the boom is the low-frequency acoustic/vibro-acoustic modes of the cavity being excited via the high acoustic transfer functions at multiple paths, due to an inherently […]
Read MoreIn a recent application, DEICON was asked to further improve the structure-borne noise reduction of two large transformers (9000 pounds, each) installed in a multi-story residential building. The transformers were housed in sound proofed rooms and isolated from the floor via mounts (compressed fiberglass mounts for one transformer and cork/neoprene mats for the other). In […]
Read MoreThe application of DEICON’s patented, active acoustic damper/absorber in adding low-frequency modal damping to small rooms (listening rooms, recording studios, home theaters) is licensed to Modular Sound (the reputable manufacturer of Bag End professional grade speakers). Bag End manufactures electronic bass traps, with the trade name E-trap (TM), based on this technology. The industrial applications […]
Read MoreThe conflicting nature of vibration and shock isolation requirements, necessitates design compromises in realizing mounting schemes for systems subject to both vibration and shock perturbations. To avoid making such design compromises, one needs to pursue active and semi-active isolation solutions. One approach to active isolation is combining an active scheme with a traditional passive isolation […]
Read MoreDEICON, Inc. was invited to make a presentation on shock and vibration isolation at the global superyacht forum in Amsterdam. The following is an excerpt of the talk. There exist a number of different isolation schemes, e.g., single mounting, double mounting, active isolation, semi-active isolation, air mounting, etc., with different pros and cons. Either one […]
Read MoreDEICON’s Computer Controlled Air Isolation System is an adjustable mounting scheme capable of meeting the conflicting vibration and shock isolation requirements. This is a pneumatic system capable of changing its stiffness and changing its damping, depending on isolation requirements. DEICON has installed a number of these air mounting system on a number of gensets (Diesel […]
Read MoreDEICON, Inc. presented a 3 day seminar on feedback control to Caterpillar engineers in Peoria Illinois. Following some introductory concepts, the seminar covered the design techniques for feedback control applications, with lots of examples and hands-on experiences. The commonly used, popular control strategies such as PI, PD, and PID controllers were emphasized.
Read MoreIn a recent project, abating the 1 order (25 Hz) transmitted vibration from three 170 KVA marine diesel generators onboard a motor yacht, to the hull of the boat was successfully accomplished using a number of small tuned vibration absorbers. Four tuned vibration absorbers, targeting the 25 Hz vibration, were designed, fabricated, and installed on […]
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