Ababhali:  (1) F. Nistri, iSebe leSayensi eSetyenzisiweyo kunye neTeknoloji, iYunivesithi yasePolytechnic yaseTurin, eTurin, eItali nasePolytechnic University yaseMilan, eMilan, eItali;  (2) VH Kamrul, iYunivesithi yasePolytechnic yaseMilan, eMilan, eItali;  (3) L. Bettini, iPolytechnic yaseMilan, eMilan, eItali;  (4) E. Musso, iYunivesithi yasePolytechnic yaseMilan, eMilan, eItali;  (5) D. Piciucco, iYunivesithi yasePolytechnic yaseMilan, eMilan, eItali;  (6) M. Zemello, Polytechnic yaseMilan, eMilan, eItali;  (7) AS Gliozzi, iSebe leSayensi eSetyenzisiweyo kunye neTekhnoloji, iPolytechnic yaseTurin, eTurin, eItali;  (8) AO Krushynska, iFaculty of Science and Engineering, University of Groningen, Groningen, The Netherlands;  (9) I-NM Pugno, iLabhoratri ye-Bioinspired, i-Bionic, i-Nano, i-Meta Materials & Mechanics, iYunivesithi yaseTrento, i-Trento, i-Italy kunye neSikole sobuNjineli kunye neSayensi yeMathiriyeli, i-Queen Mary University yaseLondon, e-United Kingdom;  (10) L. Sangiuliano, iPhononic Vibes srl, eMilan, eItali;  (11) L. Shtrepi, iSebe lezaMandla "Galileo Ferraris", Polytechnic University of Turin, Turin, Italy;  (12) F. Bosia, iSebe leSayensi eSetyenzisiweyo kunye neTeknoloji, i-Politecnico di Torino, iTurin, i-Italy kunye noMbhali oFanayo (federico.bosia@polito.it).  Itheyibhile yoQhagamshelwano   Isishwankathelo kunye ne-1 Intshayelelo   2 Uyilo lweeseli zeyunithi kunye nohlalutyo   3 Uvavanyo lweseli yeyunithi kunye nokulinganisa amanani  4 Rainbow AM labyrinthine panel   4.1 Uyilo lwephaneli kunye noyilo   4.2 Imodeli ye-FE yephaneli ye-AM   4.3 AM ukulinganiswa kwephaneli   4.4 AM iziphumo zokufunxa isandi sephaneli  5 Uvavanyo lwamanani lwezisombululo zephaneli yokufunxa isandi esahlukileyo se-labyrinthine   5.1 I-Macrocell ene-backing cavity   5.2 Iziphumo   Ukuqukumbela, Imibulelo, kunye neeReferensi   Isihlomelo I  Abstract  Kulo msebenzi, sibonisa kubungqina bovavanyo lwengqikelelo ukufunxwa kwengxolo okusebenzayo kwephaneli eprintiweyo ye-3-D eyilwe ngokulungelelaniswa ngokufanelekileyo kwesithuba-coiling labyrinthine acoustic iiseli zamabanga ahlukeneyo zobukhulu obahlukeneyo. Iiseli zeyunithi ye-labyrinthine zihlalutywa ngokuhlalutya kunye namanani ukumisela iimpawu zabo zokufunxa kwaye emva koko zenziwe kwaye zivavanywe ngovavanyo kwityhubhu ye-impedance ukuqinisekisa ukuxhomekeka kweempawu zokufunxa kubukhulu beeseli kunye nobukhulu becala. I-resonance frequency ye-unit cell ibonwa ukukala malunga nomgca ngokumalunga nobukhulu kunye nobukhulu becala kuluhlu oluqwalaselweyo, okwenza kube lula ukulinganisa ukuphindaphinda kokusebenza. Ukusebenzisa le datha, iphaneli eyisicaba yenzelwe kwaye yenziwe ngokucwangcisa iiseli zemilinganiselo eyahlukeneyo kwi-quasi-periodic lattice, ixhaphaza i-acoustic "rainbow" effect, oko kukuthi ukugqithisa impendulo ye-frequency yeeseli ezahlukeneyo ukuvelisa i-spectrum yokufunxa ebanzi, egubungela uluhlu olujoliswe kuyo olujoliswe kuyo, olukhethiweyo phakathi kwe-4000 kunye nesisombululo se-absorption ye-H iyilwe ngokwemodyuli, ukuze isebenze kwiijometri ezahlukeneyo. Ukusebenza kwephaneli kuqinisekisiwe ngokuvavanywa kwigumbi elincinci lokuhlaziya, kwaye ukufunxa kufutshane namaxabiso afanelekileyo kuboniswa kwiifrikhwensi zokusebenza ezifunwayo. Ke, lo msebenzi ucebisa inkqubo yoyilo lwezisombululo zephaneli yokunciphisa ingxolo kwaye ibonelela ngobungqina bokuvavanywa kokuguquguquka kunye nokusebenza kwe-labyrinthine metamataries ukwenzela ukuthotywa kwesandi esiphakathi ukuya kwi-low-frequency attenuation.  1. Intshayelelo  Kwiminyaka yakutshanje, i-Acoustic Metamaterials (AMs) ifumene ingqwalasela ebanzi ngenxa yeempawu zabo ezikhethekileyo, ezingafumaneki ngokuqhelekileyo kwizinto ezenzeka ngokwemvelo [1-3]. Ii-AMs zinokuvula indlela eya kuphuhliso lwesizukulwana esitsha se-acoustic absorbers kunye ne-diffuser ezinobukhulu obunzulu be-subwavelength, ezinokulungiselelwa i-spectrum yefrikhwensi efunwayo [4]. Ukusetyenziswa kwabo kuzisa amathuba amatsha kwingxaki yemveli yokufikelela kwi-low-frequency absorption [5]. Ukongeza, ii-AMs zibonelela ngamathuba okufumana ukusebenza okuphezulu ngokwemigaqo yokunciphisa ingxolo, kwaye ngaxeshanye kuncitshiswe ubungakanani kunye nobunzima bezakhiwo [6], ukuya ngaphaya kwemida yetekhnoloji eqhelekileyo esekwe kumthetho wobunzima obunye, i-double layer resonance frequency toning kunye ne-porous absorber thickness optimization [7]. Ngokukodwa, ezi zinto zintsha zibonakala zithembisa kwaye ziphendule kubunzima kunye nobunzima obubekwe yimfuno yoyilo / yezobuchwepheshe kwimarike, umzekelo, kwi-aircraft cabin design kwi-aeronautics. Ii-AMs zinokudibaniswa kunye nezisombululo eziqhelekileyo ezifana nezixhobo ze-porous [9], i-Helmholtz resonators [10] okanye i-tensioned membranes [11,12] ukwenzela ukusebenza kakuhle okanye ukulungiswa. Kuyaziwa ukuba ukufunxa ngokugqibeleleyo kunokufumaneka xa imeko yokudibanisa ebaluleke kakhulu isenzeka, apho ilahleko ye-thermoviscous ilungelelaniswe ngokuthe ngqo kukuvuza kwamandla [13]. Ukufunxwa okugqibeleleyo okunjalo kulawulo lwe-subwavelength kuye kwaboniswa ukuba kuyafezekiswa ngokulandelelana kwamaxesha athile kweeresonators ze-Helmholtz ezithe nkqo [14], kunye ne-plate-resonator/i-closed waveguide structures [15]. Nangona kunjalo, ii-frequencies zokusebenza kwezi AM zihlala zimxinwa kakhulu, okanye izakhiwo kufuneka zibe nkulu ukuze kusebenze ukusebenza kwebroadband. Ukujongana nale ngxaki, ingcamango "ye-rainbow trapping" kwii-acoustic resonators ezineparameters eziguquguqukayo, kwaye ngoko ke i-frequencies yokusebenza, [16,17] okanye iinkqubo ezine-asymmetric porous absorbers [18] yamkelwe ngoku.  Uhlobo olunomdla kakhulu lwe-AM oluye lwavela kwiminyaka yakutshanje "i-labyrinthine" okanye "i-coiled" izakhiwo [19]. Ezi zisekwe ekusebenzisaneni nokusasazwa kwamaza e-acoustic kwiitshaneli ezigobileyo zecandelo lomnqamlezo we-subwavelength, okukhokelela kwisalathiso se-refractive ephezulu kakhulu (kwaye ngaloo ndlela sinciphisa isantya samaza esisebenzayo) kunye nokwenzeka kokuphumeza "i-double negativity", o.k.t. ngaxeshanye ingxinano engalunganga kunye nemodyuli eninzi, okanye i-conical. Uyilo lwe-labyrinthine ye-tapered ye-2-D nayo ibonakaliswe ukufezekisa ukuhambelana kwe-broadband impedance, esisiseko sokufunxa okusebenzayo [21]. Ingqikelelo nayo iye yandiswa ukusuka kwi-2-D ukuya kwi-3-D isithuba sokujiya izakhiwo ze-labyrinthine [22]. Imiboniso yovavanyo ye-theory eqikelelweyo ye-broadband negative refractive index iye yaphunyezwa ngokubonisa okanye imilinganiselo yokudluliselwa kunye nemilinganiselo emibini esekelwe kwiprism kwi-3-D eprintiweyo iisampulu ze-thermoplastic labyrinthine [23]. I-Hilbert-like fractal acoustic metamataries nazo ziyilwe, zenziwe ngoshicilelo lwe-3-D, kwaye zibonakaliswe ngovavanyo, ukufezekisa ukuthotywa kwamaza asezantsi okusebenzayo [24,25]. I-3-D "i-port-one-port" ye-labyrinthine izakhiwo nazo ziye zacetywa ukuba zifezekise amanqanaba aphezulu okufunxa isandi kwiindidi ezinkulu ze-frequency (kunye nee-angles ezahlukeneyo zeziganeko), zisebenzise ubude obuhlukeneyo bomjelo ukulungelelanisa iibhendi zokusebenza [26]. Omnye umzekelo we-labyrinthine AM ebonelela nge-tunability enkulu zizakhiwo eziphefumlelweyo ze-spider-web, apho ukongezwa kwe-edge cavities kunokuphucula ngakumbi amathuba okulawula iipropati zokusabalalisa, ukulawula ukubonakala kwezithuba zebhendi okanye i-velocities yeqela elibi, kunye nokuhanjiswa kwe-talor / ukubonakalisa iimpawu [27]. Izifundo ezininzi zibonise ukuba ukusetyenziswa kwezakhiwo zokuzaliswa kwendawo, njenge-Wunderlich curves, inokulawula ngokufanelekileyo ukuhanjiswa, ukubonakalisa kunye nokufunxa ngokuguquguquka kwe-channel tortuosity, ukwenzela ukuba i-broadband reflection / absorption epheleleyo inokufezekiswa umz ngokulungelelanisa ubude besiteshi [28,29].  Ngaloo ndlela, i-labyrinthine kunye ne-AMs yokuzalisa indawo ibonelele ngendlela efanelekileyo kakhulu kunye neyona ndlela ifanelekileyo yokuphumeza ukulawulwa kwesandi kwiindidi ezinkulu ze-frequency, ngokukodwa kwi-subwavelength regime, ngokulungelelanisa iiparamitha ze-geometrical design (umzekelo, i-tortuosity yeshaneli okanye i-elongation kunye nobukhulu bomgodi). Olu hlobo lokuziqhelanisa lunokuba luncedo kakhulu kwizicelo zokufunxa ingxolo kwisikali esincinci ukuya esiphakathi, apho izithintelo kubungakanani besakhiwo sezinto zokufunxa zinyanzelisa urhwebo phakathi kokusebenza kakuhle kunye noxinzelelo. Izinto ezifunxa ngokwaneleyo zesiqhelo ze-acoustic, ezinje ngoboya beglasi okanye amagwebu ngaphakathi kweephaneli zesandwich ezinobunzima obuphakathi kwama-75 kg/m3 [30] zinokufunxa amandla amaza okumaza okumaza kuluhlu olubanzi lwamaza, kodwa iimpawu zazo ezinkulu zinciphisa usetyenziso lwazo olubanzi lokufunxa rhoqo. Ngapha koko, iimpawu ezikhaphukhaphu ziba zibalulekile xa usebenza nezixhobo kwi-aerospace kunye neshishini leemoto okanye eminye imimandla yetekhnoloji [8]. Okwangoku, izifundo ezimbalwa [31] kuncwadi zibonise izifundo ezineenkcukacha zokulinganisa i-acoustic kwizakhiwo ezinkulu ezifana neepaneli ezisekelwe kwi-metamaterial, kwaye akukho nanye kwi-labyrinthine, ngokolwazi lwethu. Ngaphezu koko, kuvela imfuneko yokuphanda ukusebenza kwe-labyrinthine AM kwizakhiwo ezikufutshane neemeko zokusebenza ezinokubakho, oko kukuthi, kwiimeko zentsimi.  Ngale nto engqondweni, uphononongo lwangoku luphanda uyilo lwe-labyrinthine acoustic resonators, indibaniselwano yazo efanelekileyo kwiphaneli ye-3-D eprintiweyo "yomnyama" kwaye inikezela ngovavanyo lobungqina bokuqonda ukubonisa ukufunxa ingxolo yebroadband esebenzayo. Eli phepha lichaza le ndlela yokusebenza ilandelayo. Uyilo lweeseli zeyunithi ye-labyrinthine (UCs) kunye nemodeli yokuhlalutya ye-spectra yabo yokufunxa ichazwe kwiCandelo 2. Ukubonakaliswa kovavanyo kunye namanani kunye nokuthelekisa kunye nemodeli yohlalutyo ye-UC eyiliweyo inikwe kwiCandelo lesi-3. Uyilo kunye noshicilelo lwe-3-D lwephaneli egcweleyo kunye ne-variable, ekhethiweyo ngokufanelekileyo kwi-constituent ye-constituent ye-4 imodeli ye-diversion ye-4 yovavanyo Ekugqibeleni, uphando lwamanani lokudityaniswa kwephaneli enezixhobo eziqhelekileyo ezifunxayo zichazwe kwiCandelo lesi-5.  Eli phepha   phantsi CC BY-NC-ND 4.0 DEED ilayisenisi. liyafumaneka arxiv

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