Abstract
Aiming at solving the NVH problem in vehicles, a novel composite structure is proposed. The new structure uses a hollow-stub phononic-crystal with filled cylinders (HPFC) plate. Any unit in the plate consists of a lead head, a silicon rubber body, an aluminum base as outer column and an opposite arranged inner pole. The dispersion curves are investigated by numerical simulations and the influences of structural parameters are discussed, including traditional hollow radius, thickness, height ratio, and the new proposed filling ratio. Three new arrays are created and their spectrum maps are calculated. In the dispersion simulation results, new branches are observed. The new branches would move towards lower frequency zone and the band gap width enlarges as the filling ratio decreases. The transmission spectrum results show that the new design can realize three different multiplexing arrays for waveguides and also extend the locally resonant sonic band gap. In summary, the proposed HPFC structure could meet the requirement for noise guiding and filtering. Compared to a traditional phononic crystal plate, this new composite structure may be more suitable for noise reduction in rail or road vehicles.
Highlights
With the development of phononic crystals (PCs) [1,2,3,4], new characteristics of controlling acoustic/elastic waves have been studied, such as low frequency band gaps [5,6,7], waveguides [8,9,10], filters [11,12], sensing [13], and sound focusing lenses [14,15]
The band gap and waveguide are more important for vehicle NVH problems
When the periodic pillar arrays are deposited on the thin PCs, two types of band gaps can be found by selecting appropriate geometric parameters to impede acoustic wave transmission [16,17]
Summary
With the development of phononic crystals (PCs) [1,2,3,4], new characteristics of controlling acoustic/elastic waves have been studied, such as low frequency band gaps [5,6,7], waveguides [8,9,10], filters [11,12], sensing [13], and sound focusing lenses [14,15]. WGMs could guide and filter sound waves in Bragg band gaps with a smaller size compared to the former beams. This thin film structure limited low frequency band gaps and cannot adapt to the change in vehicle drive situations. Tarhee crerseualttesd with prove thadtisthtrisibnuetwiodnesfi. nInedthvearsiiambluelmataiyonplraeysualmtsowreitihmpanoratanntti-rsoyleminmtehteridcisLpaemrsbionwave inp performannacrer.oInwS-ebcatniodn f4r,ethqrueeenHcPieFsCamreusltpipoltetxeidnginartrhayestarraencsrmeaitsesdiownithspdeicffterruenmt FaRnd the d distributimonasp. .InFtihnealsliym,uwlaetiodnrarewsufltisvwe icthonanclaunstiio-snysmfmorettrhicisLanmebwwcaovme ipnopsuitt,evacrriyasbtleal plate nmaarpro. wFi-nbPaaolnlytde, fnwrteeiqadulremanwceicefihsvaaernceiossnpmcoltuatsenidodninms tfehoterhttohradisnfsnomerwisFscRioomncospnpoetsrciotterlucwmryitsahtnadSl pTthlMaetedf1iisn0p3Slaeccchetiimopnesn5at.re brief Potentialimn etchheansuispmpalnemd menetthaordy.foTrhFeRlacoynoturotlowfitthheSTsMtufd10y3 icshiipllsuasrterabtreiedflyindFisicguussreed, with in the Suplipnleems denivtairdyiMngattehriealsse. cTthioe nlasy.out of the study is illustrated in Figure 1, with blue dashed lines dividing the sections
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