声学基础答案龚秀芬

声学基础答案龚秀芬

ID:83375768

大小:9.12 MB

页数:61页

时间:2023-07-01

上传者:无敌小子
声学基础答案龚秀芬_第1页
声学基础答案龚秀芬_第2页
声学基础答案龚秀芬_第3页
声学基础答案龚秀芬_第4页
声学基础答案龚秀芬_第5页
声学基础答案龚秀芬_第6页
声学基础答案龚秀芬_第7页
声学基础答案龚秀芬_第8页
声学基础答案龚秀芬_第9页
声学基础答案龚秀芬_第10页
资源描述:

《声学基础答案龚秀芬》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库

Ạ⚪ᫀ⚪11-1ᨵᙌᘤḄᩭ,ᐸ!ᨵ⚣᳛$/,&$'”')*Ḅ+ឋᦪ஺/0ᵫ23᥅501-27ᨵ&8“'ᵨ;$/Ḅ<=>?@ᢞḼ'=CD!E᪀ᡂᓫ᤮'᝞KᡠM'Ꮇ7=CḄ&O+ឋᙳQᶍ஺ST0(1)WXYZ[⊝]^4`'*ᡠaᑮḄឮd[⊝Ḅeᵫfghijkl᪵⊤Mi(2)᜜epᣵ'ᙠseᵨtᙠ[⊝]^▬vgh,*Ḅ⚣᳛k᝞f⊤Mi(ẖ,g$xeyz{)27cVIK⚪1—2/0(1)᝞KᡠM'M,,,aeᑖ᪆0*axeᔣ?ᔣta=ᔣḄYeT,WeḄᔠe/ᳫ᤮`Ḅឮde'ᔣᳫ᤮Ḅᑗᔣ஺7=C᤮?ᔣᜳ$6,ᑣsin6=aeᑖ᪆50F-Mgsin0-Mgymm(2)᜜epᣵ(Yepᣵ)'ᳫᙠᵨtᙠ[⊝]^▬vgh᤮'yz{Ḅᔣ]Ḅᔣ¡¢஺ᵫ£¤E¥¦0drᑣs᜼=sªᓽᘤ+1'WᳫghḄ⚣᳛஺1-3ᨵ;$/Ḅ<='®eT!EᙠD'7ᙠ]^X஺ᜐ'ᢞḼ&M,“'᝞KᡠM'ST:(1)&Xᚖ?YZ[⊝]^4`'*QᡠaᑮḄឮd[⊝Ḅeᵫfghijkl᪵⊤Mi´ᓫ(2)᜜epᣵ'&ᙠsឮdeᵨtgh'*

1Ḅ⚣᳛k᝞f⊤Mi(3)&^µ¶]^`'⚣᳛ᨬ¸i/0✌ᐜM,“»¼aeᑖ᪆'½K'(•/£((X,XQ+£2»XQ,(Z-X)2+£2»(Z-X)2o)O0077½&ae¿ᦔ$Á'&+ឋᦪ%=---o%0(//)77(1)ឮd[⊝Ḅeᵫ᪷=CYeḄᔠegh'ᜧ$F=/ஹ£,ᔣ$?ᔣt஺X(l-x)oo(2)⚣᳛$co-J--JTlo(3)জᑖ᪆5'/=,`'Ḅ⚣᳛ᨬ¸஺21-47ᨵ;$/Ḅ<='*®eT!EᙠD'᝞KᡠM஺7ᙠ=Ḅ]^ᜐ@ᨵ&$MḄxᱥ஺)ÌḄ!ᨵ⚣᳛஺ÍM0@ᨵM`'=Cᔣtgh☟]ÏÐᢝeḄ[⊝'jᎷEMZ[⊝]^ÒḄÓ]Ô'ÕÖ4<<ØᩩÚ஺K⚪142Tcos0-Mg/0᝞KᡠM'aeᑖ᪆5Q->=>—=Mgcos-I12JÝÓ<<4'5Þ$2TDß=yàIat2d2A4TATᓽM7e+~r^=~T^°1-5ᨵ'ä¦ᐸå]$æ'åz{$ç'S)ᐸ]ஹz{Oè&஺/07]£=£“cos(gr-°),z{⊤ê3$V=-Ct)£sin(g/-஺)஺oaᵫµ4.=%'Mg=0,íᐭ☢3ðñ5:

28=8^COS69/0v=-g%smg'oè&E==3/,ø£஺1-6ᨵ'ä¦ᐸå]$ù'åz{$ú,S)ᐸ]ஹz{ஹOè&஺/0᝞KᡠM$'+ûḄ+ឋᦪ$K,“'&$M,“'ýþᔣxᑣᵫ⁐+0J=O,(ᐸ=-^,)dᔆM,„#$J=4cos()-*),Wo=acos*o=—/জ:-+V/%+4=0=&4=0=%.=<%=*cos(%21o᜛°=arctan”0஺=:-J;+*cos(«y/-arctan—V)(3஺CDEFu=+*cos(tyr-arctan-^ߟ+—)0'C2ḄLME=gM,"=MX஺+ᱏ)1-7ᎷU2VWḄXᵫYᑡ[\]^⚣᳛ஹ]^bḄcdA=sin69Z+—sin2cot,jkl2(I)ᙠop.᎛ᨬᜧ(2)ᙠop.᎛EFᨬᜧ#l••=sin69/+—sin2cot,2dE2c2•c—r-=-co~sincot-2a>~sin2cot஺2u—=0,$lCDt=2ᦇ)±xᡈz=2k7r±71,dt3{|}~$l/=2,ᨬᜧ஺CD

3de/1u——=0,$l"=%"ᡈ"=2&arccos(-2),dr4Qkjr{|}~$l=.EFᨬᜧ஺CO1-8Ꮇ2VWḄᵫY⊤j&=COS(69/+(P)ᐸ+=J++22cosḄ2);(p=arctanDCOS0+஽COS%lcos(6wr+0)+cos(a+02)A=4cos/COSQ8=-&sin/+&sin%)---BijJ=Acoscot+Bsincot=yj+B2cos(cot+°)(ᐸ°=arctan(---))AA2+B2=Jlcos2(pஹ+Jcos2(p+2஺$cosqcos᜜2T7zBஹ/&sin+5singஹ(p=arctan(——)=arctan(---—~~—----)A0cos/+J?cos(p2u.=J-2+=J¤+ᡈ+2Jcos(@2%)ᑣJ=£cos(w+஺)1-9Ꮇ2VWḄᵫY⊤£=%COSWt+£COSWt(W>Wj)1222j£=£C0S(W/+/),a¨r4~.I22Z7776*9sin(zlw^)ᐸq=dG+4+2£«2cos(/)/),᜛+arctan--------------,zlw=w-w.12J+ecos(Jwf)2#lX®Mᦑ°;ᵨ®M²ᩭ⊤஺ᵫ´µUᳮ·ᐸ,Aw=w-Wjo2ᵫ¸¹º☢¼·zesinAwtB2$sin9?=--------

4$.=/:"ᨬqaE%sin-Awtᦑ_6*2sinAwtI+scosAvr2ᓽ°஺1-10ᨵ2VWᐸÂᨵ⚣᳛ÃÄ·ÅMMmÆÇឋVᦪKmÊËÌÍᙠÎMMmÏ▬d2Ñ·M⊈ÓÔ$ᵫÎÅÕÖḄÇ×ØÙᱏÚXVWḄMÛÇឋVᦪÜ°Ë$jÝ.ᵫÞßUᳮ$mg=KQ\=>K—mg/^\mmᵫVWÂᨵ⚣᳛Ḅ⊤à=HI$M=áy=/.mâÏᡠäVWḄMMmÛÇឋVᦪKmÜ°Ë#.1-11ᨵ2VWᐸÂᨵ⚣᳛åÄ·ÅMMmÆÇឋVᦪÊËÌÍᙠÎMMmÏ▬d2M஻2,ÓÔ$ᵫÎÅÕÖḄVWÂᨵ⚣᳛ç,ÚXVWḄMÛÇឋVᦪÜ°Ë$jÝ஺#lᵫK,“=2ïí2","ᵫê=ë2ì'í2,+îí_42/ì2/2ὶé[,1-12ᨵ᝞²1-2-3Û²1-2-4ᡠḄÇ×ñòÛÓò[óVWjᑖõᑏ÷øùḄÃú,ÓË÷øùḄûᦔÇឋVᦪ஺²1-2-3²1-2-4#lñò.ÃúA1,,,ý+£=o,ûᦔÇឋVᦪÙ=þ"d2’”dt2K+KK+K,im2mXm2nÓò.Ãú+ë&,“+K,,“£=0,ᦔឋᦪK=+K,„஺at1-13ᨵᕒᙠᨴᳫ⊤☢ᵨᨴᳫ᪵஺ᙠᙢᳫ"#᪥%&'(0)100/*+0)1,஺ᕒ-.ᙽ&ᑭᵨ1234.0.45&ᯠ7&89:;<&=.ᐸ:;ᕜ@1s,ABᨴᳫ⊤☢ḄDEFG3HIJKLMḄN▭PQHIJK

5RSTMḄN▭PQᙢᳫ⊤☢ḄDEFG3g=9.8,஻s2,ᨴᳫ⊤☢ḄDEFG3ᵫ_`abcFM=-KX,JF=-MgᑣK=^=^=10gMx0.1T27Cᔊ]n1“10g10x9.8T=—=2q=1ᑣM=Y=-----®2.5kgg7K4v24/&y1y=——ᑣxr=0.04m£0.4Mg'=5'ᑣg'=ᓛV=412x0.04x1.58m/s2Mᦑᨴᳫ⊤☢ḄDEFG31.58F//,LMḄN▭PQ2.55o1-14AaejM+a/3+R+aeJ(ax+2^+…+aeJ(M+(n-'w-ḄN&ᓽ+.஺1-15ᨵK,,,ᙠ9☢FDᱥM,“&᪀ᡂ:;&ᐸᨵ⚣᳛/o&(1)ᎷT⌕ᨵ⚣᳛ᩭ&AB¡M¢F£¤¥Ḅ&¦§᪵ὶ©K(2)ᎷTDᱥ⌕FDª&L⌕ᨵ⚣᳛«¬&AB¡M¢F£¤¥Ḅ&¦§᪵ὶ©?RSᨵ⚣᳛E=1-J""஺2°Mm(1)=>K,,,f±&ᦑ¡M²᜜´©µ᪷¥Ḅ·(2)nK,,r2K,“,ᦑ¡M²᜜¦©᪷¥Ḅ஺.f°rf஺1-16ᨵ¹ºdḄ¼½¾¿ᘤ&⚣ᐸ¼½Áᙌ+ÃPÄᩭÅÆ஺ÇcᐸÈPQM”&ឋᦪ(.஺AM¾¿ᘤḄᨵ⚣᳛஺RSM¾¿ᘤḄᨵ⚣᳛K஺2°1-17ᐜᨵË0.5kgḄPQÍᢞᙠÏPQḄ&ᜐÑ☟᝱Ô⊝Ö&7ᩭy×Ë0.2kgḄPQ▬Fᙠᐸ☢&ÙᩭÚÛÜ0.04m,Ý▬FPQÞᯠßᣵ7&cÙ0.5kgPQḄ:áᙠ1sᑁãJᑮ,åæḄ1/eª&AèéS

6(1)ÙḄEêëᦪKm&Rm;fo\(2)Ý0.2kgḄ▬FPQÞᯠßᣵ&ᡠᐹᨵḄîQ·(3)ᙠ"#1s7&ᐹᨵḄÔᙳîQ஺RSপᵫñ`aᳮc&K=mg/smᡠóKm=0.2X9.8/0.04=49N/mᦑ6=-nR/lN-s/m2Mm(2)ᡠᐹᨵḄîQE='K",ᱏ=_Lx49x0.042=O.O392J22(3)ÔᙳîQ4=5.31x10-3/1-18AÝEêPúûQ,“K0.5&PÄ⊦ã:;þÿḄ஺Ꮇ4=0,-=%Ḅ஺Ḅ!"ᓄ3=2Mm%&!ᓄ'y=j(52—ᡂ)(!ᑏᡂ•••,ᙠᩩ/4=0=0vj=vf=003ᐭ56'%R_%2§2ߟ2§27Ḅ£=e-"(AeE+6e-E')ᐸ9A=——ᓰ=,B==°஺2^2-72A2—B1-19ᨵDEᐸFᨵ⚣᳛I᝞KL᜜IḄ⚣᳛NOPḄQឋᢙTDUᢙVW஺DEᙠ᜜IXᵨZX[\Qឋᢙ]^DUᢙ0MM

7KLfo=50Hz,/=300Wzᑣa/(d)♦f4=^ghi1-20ᨵDU0.4kgḄjᱥlᢞᙠDU0.3kg,Qឋᦪ150N/mḄQopq:(1)PḄFᨵ⚣᳛stu(2)᝞9vᐭ5kg/sḄIwᑣḄFᨵ⚣᳛xstu(3)y᜜I⚣᳛stzDE{|}ᨬᜧu(4)ḄTᐳ⚣᳛stu(1)ὃ⇋QoḄDU,(2)ὃ⇋QoDUḄ!XDEḄᦔDU3.(3)DQ,“=TL="=1.66,{|ᐳ⚣᳛f=fo=2.39Hz.r(4)ᐳ⚣᳛f=f=2.MHz,r0ᐳ⚣᳛I=Qf=2.92Hz.ma1-21ᨵDE᜜IᡠyᐳᕜḄὑUTiḄUVW%¡஺2,„¢ᕜὑḄUE5KM7R..L-=-Z------=----E12fMM",Vamm2ᐳ/=/o0.E_R,“_24_ITC"~E=7^=~^M^=Q^,°R.

81-22(1)DEX[\¥ᨬᜧḄ¦ᙳὑ¨᳛Ḅ⚣᳛7%Ḅ©wªFᨵ⚣᳛/஺«(2)Ꮇ¬ITNᙠ®ᐸ¦ᙳὑ¨᳛W./«Z°±ᡠ²Ḅ¢⚣᳛ᑣᨵfQ0m/-Z2(1)¦ᙳὑ¨᳛³="´"=-µ᮱(Iwᓃ})¸JO2DE[\Ḅ}ᓃ,=------,(¹᜜I},gFᨵ⚣᳛M,DU2”Iজ2Mz2-l)2QD⚣᳛Wz=^=2)জ஺foyZ=1ᓽ/=¹)ᐳᓃ¿ᨬᜧÀ¥ᨬᜧḄ¦ᙳὑ¨᳛஺1)(2)W=--Rv]RmWRmax=~Ó[max=1Æ;22S(i)W2^RmaxR222a)~M~Ë------F£n7-------ÌᐭÍ(1),ᑣz2=(z2-l)20«(2)“Ï+—᷊ᵫÍফ'Z=(z2—1)Q,“'Z=ÕÖ×Ø¿4=Ù×Ú20,“20,z=(z2-l)\]^2=¿z2=l+g.QÛ!Iz-z,=XgpA_AAzAX2==Q44f஺Q,„m1-23ᨵDU0.4kgḄjᱥlᢞᙠDU!âãᶍQឋᦪ160N/mḄQopḄIw2Nçs/m,XᵨᙠjᱥpḄ᜜IF=5cos8W஺F(1)OPḄ{|}ஹT}âî¦ᙳὑ¨᳛«(2)ᎷᐳqP᜜I⚣᳛%stu᝞᜜I}5N,ïðPḄ{|}ஹT}ஹ¦ᙳὑ¨᳛ñstu

9ò1óᵫ[\K”õ+R,“÷+K,/=FF^dtatᑣ{|}£“=//«0.0369"?&K,`w2M,“y+w2R,/}v=ws=0.296m/saa}=w2s=2.364n?/521¦ᙳὑ¨᳛P=-2=-0.0876òw2ᐳ=3=1᥅-2=3.158HZ2%“2M“,ᑣ£=[%«0.1267naJK,“-'2(2+'2%2v=ws=2.495m/saa/4=w2e=49.6/M/52a1ᙳ3ὑ5᳛P=—gR,,,v2=-6.225'a1-24:;<=1-4-1ᡠ?ᓫABCᙠt=0,J=y=OHIᩩKLMNOPḄ⊤?STᑖVWX5=0Ybwoyz{bL,Z0fgPḄ\]஺XXP_`aMNOPḄbSc_Xp'jrᐸe=fg7'஺7஺■2HIᩩK_£=0,V=0»lᐭn_Pn_oG=J-2coss2+tsin82+2b6ycosesin8+/2cos62£c—^Ge-&cosi*-%+£“cosefift-0fo

10Z3=0R=0,0=arctan-^2^=—,஺=%+=জin()Rm2271஺஺=f%=4=-£(sinজo'+cos")oaZfg4->8,ᑮᐳ஺1-25ᨵfᓫABCᙠᐸᙽᑮ᜜=sin24rḄᵨ:;ᐸ᝱OḄ஺P_ᓫABCḄMNOcᑣM“g+&,ᚪ+Z/=/1drdr2d2^n“ᓃ1/cஹM,”~rr+R,„—+TCOS⇵2drat2ᵫS1ng=f2Kmo€=¢஺£lᐭS2n^=—r-----------2-----------FL4Jᑣ¥=----------2-------------------F=T-^জ஺R+egM,“--^21-26:;᝞=ᡠ?OBCᙽMḄ᝱⊤?S.P_`ᙽ§¨ᑖ᪆ªnᙽMḄ«Oc_¬S᝱PḄfbSc€=ᡈ/"'¯ᐸlᐭSªn_..Kஹ+K,FMeo-----!------ᐸe|4|=—"±%=arctan--~᧽f.´µ+5+¶஺-ᓩ…ᦑᙽḄ᝱⊤?Sªºᑏc_7T|cos*]-%.

111-27ᨵ᝞=ᡠ?Ḅ὚ᔠOBCᨵf᜜K=F"e஻”ᵨa஺ḄOÁÂ὚ᔠÃÄÅÆÇÈÉÊO;ËÌḄOYOᑖV=1-4-1c஺ᓃYÍv,o:ᑖVᑏ<ËÌ2ḄOT;PÎÏÐZ᝱Ov.=--------------------------6YÑ=----------------F,°ZZ+(ZZ)ZZ,Z+(Z,+Z)Zt2i+2]222I2ᐸez□(ÐÓ)+KZ,=j(a)Mஹ-&+R,,-coA/A—ÔÕÖ,.K)VP_`=ey×A§¨ᝍÙÚᓭÜᑡ«O__Þ=AejM,e=BejM2ᓃ=ᓃ/'“v=Vejca,22aߪᓄc:_+Z?=j((oM2-k+R,,Z=-^-o]2CD'CO~~tt)`☢Ḅy×᦮ᳮT;Pªn1-28ᨵfᡠåæçSèéᘤëìᵫéíÆÇᙠèéᘤîgïḄᵨc:F.=Apl,ᐸeAcðᦪP”cèéᘤᡠᙠᜐéæḄ`⚣᳛Ècðᦪ᝞]èéᘤôᵨᵯOᣚ÷S(OᙌS),T⌕;ᙠfúûḄ⚣᳛ýᑁèéᘤgïᙳᒴḄᵯᘤḄᙠᑴ᝱

12"#$%ᘤ&'Ḅᵨ)*E,=Ap/>,ᐸ,A,P“.ᦪᑣ102ᓄ஺ᵯᣚ67%ᘤᐸᵯE=Rv,⌕9Eᙳᒴឤ=ᑣ⌕vឤ=ᜐᙠ?@ᑴABᓃ஺D=41FBG⚣᳛஺JᐵᦑᙠMNḄ⚣᳛PᑁᘤR&'ᙳᒴḄᵯ஺1-29SD⚪Ḅ$%ᘤ᝞VWᵨ☟ᵯᣚ67%YᵯZ%[ᐸ\⌕]GD⚪^_ᘤḄᙠᑴ᝱"#ᘤᵯ£Gabcᨵ᝞eᐵ#•.•hᨵᙠ)iᑴA£_Fa_APajR,nᓽᙠFᑴAᵯEG⚣᳛஺Jᐵ஺ᘤḄᙠ)iᑴA஺1-30ᨵlmᙌoᘤ᝞Vᙠ☢qS஺Ḅar☢stu᝞vᡠxyzᙠF{|e,aḄ~i2=ACOS0Y§5.5஺SoᘤᙠMNḄ⚣᳛PᑁᙠS⚣᳛ឤ=Ḅ᜜)ᵨe&'ᙳᒴḄ᳛ᐸᙠᑴ᝱"#ᙌoᘤὑ~ᑖḄᙳὑ᳛=%Y=3©ᓃᐸ,p஺C,ᙳ.ᦪ⌕9WᙳᒴᑣVḄ஺ᦑᙠ)ioᑴAFBᓃ஺Yᐸ,⚣᳛ឤ=Ḅ᜜)R,“ឤ=[஺”1-31ᨵ᝞vᡠxḄᵨᙌ%☢Af,“ᵫ¡¢K,“£ᥛḼ°ᙠMNḄ⚣᳛Pᑁᙠ¦ᙌD§sS⚣᳛ឤ=ḄᵯB69☢&'ᙳᒴḄs¨©ᐸᙠᑴ᝱"#¦ᙌª«/ᵯBᙠ®¯e&'ᵯ)F=BIL,ᵫ±=²hᨵᙠ?@ᑴAa=³B&'Ḅs¨©G⚣᳛Jᐵ´ᙳᒴḄ஺

131-32ᨵ¹º»Ḅ◞᝞vᡠxyz☢Ḅ?@Mm=1.5Xl(Pkg,☢ᵫÃÄ^_Ḅ¡¢£ᥛÅÄᵫäh^_Ḅ¡¢åὶæᡂ஺yzÅh¡¢ᙠÇᨬᜧÊ₹600kgB&'Ḅbc3cm,]è◞ḄÎᨵ⚣᳛ÏÐ᜜ÑÒẠḄbc*1mmஹ⚣᳛20HzB◞MmR&'ØᜧḄbc*"#Åh¡¢ḄÙ©ᦪK=600X9.8/0.03=1.96X10W/»ÅÄ¡¢ḄÛÙ©Kj=K/2ÃÄ¡¢ÏὶÞḄÙ©L=4á=2K=3.92X105N/mᑣÎᨵ⚣᳛fo==2.57Hzᵫ7îMᱏ+K,“C-Jo)=O,RJ=Js4öᐭø,2=——〈=0.0168mmK-W2M1-33ûᨵ᝞vᡠxḄü◞ᨵ᜜)ᵨ=~()y”ᵨ?@ᙽMm⌴ᙠẠbA)Ḅ.ᙽᑖ᪆!ᙽḄ"#$%ᐸ'᝱Ḅ)*+,%J=cos(a>t-9).“-Kmᐸ-S0-arctan--------R,n67⌴8ẠḄ9ᵨ%E=K“?=K,4,cos(W-஺)ᑣH=^,K.mᵫJ⌴8ẠḄFFoḄD1m=τ.ὡ஺(20RJ+VIজ)1-34ᨵ)"ᱥWXY⚣᳛%),\]^%4஺Ḅ"_ᵨ)"ᙌ,\]^abc஺Ꮇefg\]^a"hiḄjᨵ⚣᳛%klmno%Q,,qᙌrstu%/,w◣-Ḅwyz^%8஺|\]^aḄ}~ᵯ%"ᙌ,\]^acᵫ2"=!Rop

14M”,=BlawR/„+co2M--2KM,mn+1-35ᨵ)ᑴ+,Ḅ᜜9ᵨᓫhiḄJ᜜⊤ᡂF=B(l+lsinG])sin",Fᐸ-%)ᦪ%ᑴ^"hiḄ஺᜜⊤,%4=H1+siny/¢sin

151-36ᨵ)ᕈ½¾+,Ḅ᜜9ᵨᓫḄJ⊤%ᵨ=%1-£)(À7\Z,\8seneat-

16,_2ÅrF(t)cosnwtdt=0;F2“2F__-஻%᜻ᦪB=—\F(r)sinnwtdt---[l-(-l)/?]=<஻ðnFT஻ᐔ¯஻%ᏔᦪᵫJH=Ëó=](஻%᜻ᦪ)ᓽn7i஺1=[஺3=9஺5=9…õ=[(஻%᜻ᦪ)•ᵫ(1-5-14)!Â"hi!4F4F4Fஹ-=——p-rcos(wr-^)")+---p—rCos0wr-^)û)+----——J--cos(nwt-0)")(஻%᜻ᦪ)3flco7r\Z\9a)7r\Z\ü}3ý⚪22-1ᨵ)%஻?u%/ḄÿḄ(1)ᵫᐸ⚣(2)!⚣Ḅ"#$B,%⚣Ḅ&'(஺(3)+,-.஻4ᜐḄ23#4:(1)67⚣᳛/N<=>3521\81[T⚣@2/V7(2)⚣Ḅ&'(4=3B=C1ᐔIᐔ00(3)Ḅ"Ḅ&DEF஻0,x)=2Jsin%,xcos(

17(2)/=//3wxyz{|dFḄ'(஺4Ḅ"EFᐸ3=}~=C=Bcos(p,D„=B„sin(pnnnn(0

18kxdx+“°z,..,,2%/2.nnn(l-x)smKxdx=•2--------sin——xn0J஺/4/-/஻./(/-@0)/ᑣsine”=0(p-nvrnফtx/=/B,=C„“3(/-3)2-3h/Ḅi.jkᙠ23᦬Ḅ%4Ḅ"஺4Ḅ"⊤WF23⊤WFᵫ⚪ᩩ:2%¤,04x4-¡=0=0v¢I~~'22%02%--,—

19°"⊤WF஻0,%)=£Dsinᓃ/sincotnn஻=iᐸD=(-sinZ:Z+2sin—)஺nkl123জ:22-4h/Ḅi.jkᙠ23%᦬ḄÝÞ᜜·¸Ḅ'ßÒᵫᡠᨵdF'Ḅ&D஺"(1=0)=°4ᩩx=—

202-6ᨵh/,=>3஺Ḅ஺ᐸ-.ø-Á᥅úḄûüýᢞ-ÿᱥᡠḄT,᝞ᡠ஺1ᵫḄ⚣᳛2Ꮇ"#$ᱥM&Ḅ'()ᜧ+,-Ḅ.⚣/01஺2—6451ᵫ⚪78ᐸ:;ᩩ=>?@ᩩ=AvCMḄEFA-(Acos—x+Bsin—x)cos(tit—(ᐸOu=a)=2nf)nnccP&mo=0-UA=0ᑣ஺9x)=BsinBxcos(஻f-e)_ᐭ?@ᩩ=8U5-TBUcosq/cos(஻r-0)--MBITs'm—lcos(ut-(p)cccu.TAᓽMtan—/=----cMcu(ᐸOc=--Ḅ()AM--hijA6)r=T,B=,ᑣkanl0-mnoᵫḄ⚣᳛஺cMஹqy4(2)Pt᜛v1,ᦑ8/0A/tan/=//+=7~+]ᑣrtanr=/?8|ᓄA/+?=~4mlᦪ-8U/0ᐵAL=1_X+X2_%3+...(%2<1)᜛<<11+xᑣᡝ=\="[•—L-M-----——1+2M1+sA7M+-33M3T7஻12^5^]1J=E1=^~^1,c];Ms="cc

211ᑣTo2TT]K,”(ᐸOK,,[)M+M+332-7A/Ḅllᵫ-᝞ᙠ:;ᨵḄᔣᵨᵫ-☟EF¡-ᯠ£¤¥.§ᔜC©ḄEFª.45ᵫQ-2-7)©UḄ§l«⊤©Ax)=(AcosAx+Bs

22kx)cos(fot-(p).ᵫllᵫḄ?@ᩩ=Uᵫপ©=>Acos(wf-᜛)=0=A=0.ᵫ(2)©nZBcos°/cos(vvf-°)=0=cosA5/=0=>k=(n--)y("=1,2,3,…).nᵫ#ᔜ▤|²⚣᳛³´ḄEF⊤©A",x)=Bsinkxcos(a)t--ᓽᓾ,x)=£B.sin·“xcos@j-%).n=lḄ:;ᩩ=Aᵫ(4)=sin/,=0=%=nᐔ.ᵫ(3)=Bcos(—/)=/(x)sinkxdxnn=>B-(-1)"•—fx"-sinkxdx=-----------.nn"/J஺/",º2(஻»l»)2-8ᨵlImஹ¼☢A1X104m2Ḅ¾(p=2.7X103kg/m3),¿ᵫ.(1)§Ḅ.⚣-ÀᢣÂᙠḄÃlÄEÅEFªᨬÇÈ(2)᝞ᙠlÉÊḼ0.054kgḄ$ᱥ-ÌḄ.⚣ÍA,ÎÈEFªᨬÇḄEÅÍᑮÐᜐÈ45ᵫ(2-2-7)©UḄ§l«⊤©A=(AcosÒx+BsinAx)cos3G°).ᵫ¿ᵫḄ?@ᩩ=Uᵫ(1)©=>Bkcos(yvt-(p)-Q=8=0.

23ᵫফ©=>ZAsinZ/cos(w/-Q)=0=>sin%/=0=>k=—j~(n=1,2,3,,,,)nnf="=᝞="2»2ᐔ21(1)§Ḅ.⚣Aஹ=£='j6-85xÚ°=252OHZ.212x1V2.7x10|²⚣᳛ÝḄEF⊤©A5(/,x)=cos^xcos(«y/).Pcos%x=0,ᓽx=(஻lß)/-EFªᨬÇAà-ᵫáḄâ1äAå0,4,Ux='=0.5m22ḄæEFªᨬÇ.(2)PᙠlÉÊ-ᵫ(2-2-25)Uç=-4=-0.2,ᓽtank=T).2A,ᑭᵨᦪ1ê8ëUklmM=2.65.|²⚣᳛ÝḄEF⊤©A5ì(r,x)=4cosᓃxcos(î-0)./1ஹ(n——)71Pcos&/=0,ᓽx=---Z_-EFªᨬÇAà-ᵫxḄâ1äAå0,7ð,Uxi=0.59m2.65ḄæEFªᨬÇ.2-9ᨵlA/Ḅllᨵl()ÉÊMm஺(1)§Ḅ⚣᳛(2)᝞Ḅñᦪò2-8ôõ-ᐸ.⚣-ÀᢣÂᙠḄÃlEÅEFªᨬᜧÈ45(1)ḄEFAᵫ?@ᩩ=U5Mᦑ⚣᳛A5ctgkl=yklm(2)ö2-8ñᦪᐭUᵫ÷øùê5k\=1.3138k`ᑣ<=-=1.05x103()Hz2ᐔ.⚣ªA57=8sin%x,(0«x«1)Pü1-sin^xᑮᨬᜧ-ᓽªᨬᜧ஺2-10ᑖþÿᵫḄ஻=1,2ḄᵫḄxḄᑖ!"஺$%ᵫḄ%

24Ḅ%2-11&ᨵ()*/,ᵫḄ஺Ꮇ&ᐸ./0Ḅᑖ!*4(x)=cos?x,.12%(x)=0஺45⊤7஺$%8ᐸ9:Ḅ$*:0=>B=0ᵫᓽ=>?@ᵨ,B,nrc.nc=0nkl=nji=>k=—=>/=—“nl218ᡠD4=ZA“cosk“xcos®-9.)n=\ᓽAேcos®=1=>A[=—1,Aa=0,(஻=2,3,…)ᡠD4=-cosGxcosgr-H)2-12&ᨵ(ᵫ(ḄIᙠᎷ&Kᙠᙶ᪗ḄNOᓽP=0ᜐRᵫKᙠx=/ᜐ஺S45ᵫḄTU⚣᳛XY(2-2-20)(Z[஺▬%/„=(2஻(^(஻=123,…)஺(2-2-20)$%Ḅ⊤`£«,X)=(A,cosk„x+Bsina“x)cos(M—bncdᩩf%g஺=0h=i஺jᐭ⊤`$l%A“=0mnopq@=(2஻-s(஻=1,2,3,.()஺tuᵫnNOnx=/ᜐv᪵xlY(2-2-20)yvḄz{஺2-13)*/Ḅ((>|}9ᔣḄT@ᵨ(FU/^COSM)஺(1)S4Ḅ⊤`m(2)⚣᳛[ᡈ[ynḄ(Gᐸឋᦪ*K,“=஺$%Ḅ(⊤`*%C=(AcosZ:x+Bsinkx)cos((ot-cp)

254|.r=o=°nA=°cdᩩf:l,=FnFACOSᡠcosattnB=---------------------AESkcosklcos(cot-(p)UIஹI”ACOSG)t..,.ஹF..ᡠD,C=----------------------sinZrZ-costo/—(p)=----------sinkxESkcosklcos(cot-(/))ESkcoskl⚣᳛[ᡈ¦ᓽ2/<<1cosZ/ul,sinkxakx'k/©ªFFESᨵC«-------klx----1=>F=----CESklESIᓽynḄ(Gᐸឋᦪ*«஺2-14)*/Ḅ(¬(ᵫᙠ®¯&°±²⚣ᵫḄ*³S4D´ᩭ⊤7ḄḄ²⚣஺$%&ᙠx=0¬x=/ᵫnocdᩩfpᑏ*:¸=0=04^|x=0=஺’OX»k=0,½"=஺஺jᐭ¯9:plA=—C,B=-D,Xᨵ᝞Áᐵ&஻=ᔞ/,XᵨTUÄ(n=l,2,3,…)j⊤஻Ḅ(ᑡ᪷Ä஺Vc,sinu—shu,,nnB“=A----__—cosds®=-1ltcos//,,+ch/j„•.ᵫ²⚣/=4X(/)²⚣71ÌÍ)=AJ(x)cos(a)/-6),ᐸ%X(x)=(c/ex-cos"x)+ÐÑÐÒx-sinax)/ICOS1+ch/LlyII_஻0(COW]+C%஻])ZJLj-----O2(S஻Msin஻1-1)2-15)*/Ḅ(¬(ᵫ᝞Ô./0Õᐹᨵ=Y-S$¯Ḅ⊤`஺$%./ᩩfcdᩩf*%7.o=O(1);(Ù)=0(2)v=

26᱄1\/3ஹ07]=04=03;<Úx=l\OX,q=o*xÛ5Üm¯ḄÝ*:஻Û,%Ü=Acosh—x+Bsinh—x+Ccos—x+£Üsin—xcoscot-ep7vvvvÞÛ1ஹ2jᐭÛ7lA=-C,B=-DßàJ஻(,x)=A(cosh—x-cos—x)+3(sinh—x-sin—x)cos(cot-(p)(8)vvvvÞ(5)ஹ(6)jᐭ(8)lᓽsine=0ᓽ0=wr2-16)*/Ḅᵫ4¯Ḅ⚣᳛9:஺$%¯Ḅ9:*%a=0á=0‘=஺'"g஺ᵫcdᩩfl%%=0,=0dx~=idxx=ix⌕Õ9:ᨵ$ᑣwwsh-1-sm-lvvVV=0=>c/z—w/cosw—Z=1wwwWvvsh-l+sin-lch—I-cos—IVV217)*/Ḅ¬4¯Ḅ⚣᳛9:.$%ᵫ(2-2-57)lḄ¯(⊤`*ᐸ1/=R.ᵫ¬Ḅcdᩩflᵫপ=A=-CB=~DᵫফnAisinh—I+sin—I+B\cosh—Z-cos—I=0VvvIvvéo(Gêᐗ(Ú9:ìtA,B*íî$ᑣḄᦪ®ᑡ?ïnîᓽᵫpᓄlcosh®/-cos⁐/=1,éo(⚣᳛9:pᵨ"$ò4$஺&⊤79:Ḅ(VVVᑡ᪷TU⚣᳛@=ó஻%.

272-19°±ôxõ>ᨬᜧø?@*P,ù2*᜛᝞Ôûᙠᵨéüᩞᧇᑴᡂ஻ḄḄᨬᜧ᝞ᐸᙠrḄ᪾!"#$Ḅ%⚣ᨬ'(ᑮ*+ḄᨬᜧḄT=P஻/01Ḅ%⚣(ᨬᜧᜧ22-21*ᕜ456Ḅ789:ᵫ#$1Ḅ<=⚣᳛?@<=#$AB᝞ḄCD1+2,IJᨬ2KLM⚣N%⚣ḄOP஺*+Ḅ#$AR+S+S=NU(*)dx2dy2c2dt2YᐭAR(*)[+ᒹ]+ᒹ^=-4/«c)dxdyc2-23dᨵ0ᙊg8ᐸᙠ᜜ᕜNᑁᕜr=bᜐ56lmnᙊg:ᵫ#$Ḅ⚣᳛ARᐸop/=&ay=kb஺lm+ᙊg8Ḅ#$AR+஻(t,r)=R(r)*ᐸ^R=AJ(kr)+BJ(kr)஺00ᵫ᜜ᕜ=஺Nᑁᕜ0=஺ᜐ56[C4ᩩt஻|r="=0771r%=0YᐭAR[AJ(ka)+BN0(᱐)=0,0AJc(kb)+BNஹ(kb)=0,᦮ᳮ[J஺(}஺)N()(kb)-N஺(ka)J(kb)=0ao[nᙊg:ᵫ#$Ḅ⚣᳛ARᐸ^=ka,y-kho⚪33-1᝞3-4-2ᡠḄ◞#ᐸᢙOᵨᩭḄ◞#ឋ஺

28*+ᢙO᝞Cᡠ஺¡☢ᑖ᪆0¡Ḅ◞#ឋᑭᵨ¦§¨©ᵯ6«ᙠM,“^ᨵᙠM,“}☢Ḅᑖ®¯ᨵᔠ±Bᓽ[³᦮ᳮ[3-3᝞aᡠḄ´µὶ·¸Ḅ¹Ḅº»OḄ¼ᦔ´ឋ஺⚪3-3*+º»O᝞bᡠ஺¡☢ᑖ᪆0¡Ḅ◞#ឋ,

29ᑭᵨ¦§¨©ᵯ6«ᙠ¾“^ᨵᙠM,“}☢Ḅᑖ®¯ᨵᔠ±Bᓽ[³᦮ᳮ[3-5᝞(a)ᡠ¹Ḅº»O(¿ÀᶍÂI)஺⚪3-53-7(a)^ÃÄ:ÅÆḄ<ᓄ¹È᝞ᵫÉ☢ÂÊ᦮Ë0ÌÍÎ[ᑮ0ᚖÐAᔣḄÒy=v஻cosw,nḄº»¹O஺M1ZZ>Cjv=0033-9ᨵ0<ᓫḄÔὡÖ×᪀ÙÚ(/ÛὡÖNÜᜮÞß8ᡂ0àáVḄâῚὡÖḄäåM,ᨵᦔ☢áS,æNÜᜮÞß?´ឋᦪK,“Ḅèé¸êᎷdὡÖ᜜ᨵ0ìí஻Ḅìî9mᵨᙠὡÖᑁïðḄìíᐭὡÖḄñìO"ᑖ᪆ÔὡÖḄñìò«஺Cd~T~C2ó=o⚪3-93-11ᨵ0ὡô,ᐸ#Ḅ5ᨵ⚣᳛õdIᙠ,ö1ὡôí÷ᙠ0LÈøÜὡàῚàáVḄ2ùúûÅ᝞ᡠ஺!1Ḅ5ᨵ⚣᳛d#ᨵᦔäå஻?ᨵᦔ☢áS஺

303-14᝞(a)ᡠýþìÿᘤḄᐸAJI1_Mj⚣᳛஺⚪3-143-16᝞ᵯᘤ/᪀QRSᵯ᩽=ᡭᨵ!"#᪀ᡂ&'ᐗ)R“WXYᐸ஺3-18*+,ᘤḄ-ᓫ/᪀᝞(a)ᡠQᨵ^ᙌᣚ12ᑮḄ456/8ᵨᙠ;<=;<Ḅ`aஹ6cd☢Iᑖ>C,“@5,C,“@C“2ᑖ>DE@eEḄS஺*+FG☢IᎷKLMFGḄNO&ᢙ,XY⚪3-18*+,ᘤḄ஺⚪44-1Xᑖ>ᙠhdihᙶ᪗l,⍝n`opqvḄ^st஺uv";wh^st:ᵫ(3)2{ᐭ(2)2%dv1dp(4)oxcdt0(4)x2d2vd2p2(5)প2P஺-য

31d2v_1d2v(5)(6)2dx22drCnih^stvsh24-2᝞`ᙠIᓫᑁᐭᓫIlḄ`a஻oq(x,y,zj),Xᨵᑖ£Ḅst.uvᵫ¥`ᙠI`Ḅ¦§ឋst©ªᦋ5.✌ᐜὃ⇋ᙠhxsᔣ=Ḅ¦§ឋstᵫ`a±ឤ³2sµpv·..dp,µxc"¸.c•S3ஹ·τ0&\¼ᓽdx0°¿dtÀᐸ᡽ÂᑮihḄÃÄdiv(ÇÈ)+᜛0<7=Î(1)otÏᵫ`ḄÐ^st@ᱥ᝱st2᜛0Ó=-graঢ(2)dtp=c/p(3)(1)×ØÙ2/6v..dq.d2p-div(᜛°—)+div(p—)=—.0dtdtdtÀফ@ব{ᐭ=2³Ý1Uἠ"à).=ᓽᨵᑖ£Ḅst.4-3᝞`ᨵ6ᑖ£K8ᵨᙠᓫI`=Ḅ6Rx,y,z,“Xᨵ6ᑖ£Ḅst஺uv6áâÐ^stv✌ᐜὃ⇋hÃÄãäå"IᐗF/=(Po+p)S+FSdx,F2=-(Po+p+dp)S-F/Sdxxx+lx

32ᑣᔠ6-(èSdx+éSdx),ᵫêëìíîï2Ïð¼ihÃÄὃ⇋";w2ñ×òstóv-div(PoV)=/~otᵫô=i³võ)==ö∑ø24-4᝞ᙠùᨵ᡾^`☟᝱üqýþᙳᒴḄᓽA=A(x,y,z),Ḅ„1,,ஹ2Z1"P-p"=g'"ᓽ""஺ᙠᙳᒴḄᩩ!Ḅ"#p=_gradp(1)-[div(pv)+vgradp]=—(2)dtP=c)বᙠ$%&Ḅ'(ឋ*ᑜ(1)-.(2)-Ḅ"#(ឋ/ᓄdv./Po~T=_gradp(4)at-[div(pv)+vgradp]="মQ()Ot(3)-2ᐸ4Ḅ5ᦪc789:;<=>⊝᝱AᦪḄBCDᦪ஺E(3)-F/GHIJᐭ(5)-L-[Jzv(pv)+vgradp]=-4vযo0᳾@(6)-F/GHL/8vdv1d2P(r-v(—)+—gradp]=——rPA)QdtdtCQdt(4)-JᐭQ-R$l(graS)=?2pᓽ”Bc"U=gradp.grad(lnpo)dt4-5BV▲XᙊZ[\]^_ᔣaᙳᒴbc%deᐸfg▣☢8ᙊZ[Ḅj_ᔣ^_ᓫlXᙊZ[▣☢☢mS=2஻GopqḄᐹs[-஺

33tuV▲XᙊZvwV▲ḄᙳᒴᙊZpxᓽ%☢Ḅ[yᙠz{|4}ᢝB:,Rz{ᔣ2]ᔣᡠᓫlXḄB$ḄsᡠᒘoḄUaẆF஺ᙠ஻ᜐᐸ%☢☢mS=2ᑗᓫleᑁᐭ=᜛5஺ᙠᔆᓝᜐ᜛ᓃSw2ᓄᓫleᑁo=ᡠᓫleᐭsmᐗḄ=xpvS,-x35=-¢ᔳ$;oruz{ᙠᔣ¤Rὃ⇋$%&[§e¨d©uªsmᐗᑁ=«¬;ᓫleᑁ=2Ḙ¯dtᵫ=±ឤ:³ᨵ-᝕0"=·/¯জdrdtu᜛=A+"ᡠজ-/ᑏ-᜛0¯2=s½ঝdrdtঝ-¿ÀÁÂÃ,2BQoÆx5Ç+v^=q7ঞSSdrdrdt©ᱥ᝱p=Ë=4টᵫঞ.টÎo^=Bᨴ0У+ÒÓÔ]¿ÀF/GHLÖ=Bzv×Ë+ØÙ2]ঠdtdrdtdtorᵫ¨dL0஺Ë=-ÖJᐭঠ-Lἠ=_Ý[BßBàÓ2]dtdrdrdtdrdror᦮ᳮLã+,ä=4"ãdr-rdrc7dr4-6᝞çḄ▣☢ᢥéᢣᦪ*³2ᓄᓽ5=5஺x1+%%"ᐸ4S஺í=0ᜐḄ☢mDᦪHoeḄᐹs[-஺tᱯï[-Ḅᵫ;S=Soxl+a“x",JᐭQ☢ḄL᦮ᳮLeḄᐹs[-4-7ôõᜩx÷øù4x࠷Uû4üýàᜩxj÷0࠷eøoþÿ᝞☢ᢝᓄḄ!ᑖ᳛$%&஺()*1,-./0/=1.402,᪗:ᜧ0<=1.013x105ᓃ"=273+1

34//=29x103kg/mol;R=8.3\J/kmolᑣE஺஺=᦮%c„(0࠷)=JG273=331.6m/sᑣ[(7࠷)+331.6+0.6(m/s).w-(2)/=—=£C()SK☢ᑣL=MPocoNAZ%=^0(4^0~^0(0࠷)=724%x1()0%O஺(0஺0KSIL=101og—(dB)l0/(40࠷)/(0°QNij\SIL=S/A(40°C)-S/A(0°C)=10log10---------iOiog.o——/ref/fef_in]/(40࠷)_in,gco(4O°C)=0.3dBP1°l°gio)(0Q)PT°l°gio&o(O°C4-8᝞ᑡᾭVᑮXYὡḄ[◞][^ᙠ(l/20)s`]abc`defᩭhiYjPklᜋno⌕qrḄsjtuaᑮvwxyḄz(){lᜋsYL|}~YjPklᜋno⌕8.6஻?ḄsjtuaᑮvwxyḄz஺4-9(1)hf/0ᵫ.஻Ḅ-ḄᓣlḄ⊤X஺(2)hiᙠ20࠷ஹ᪗:ᜧ0Ḅ/080dBḄ☢Ḅᓄqo()(1)-ᳮ0ᨵAV=—R"KP=R+APT=T+AT0Mᑣ(6+AP)V=-R(7+AT)

35—%—=—4—ᓽAT=—76+AP"+4(2)SPL=201og-^-(dB)loPrefᵫ⚪80=20log,Aᑣp=0.2P,ᓽ0=0.250e/%•ᑣAP=0.24-10ᙠ20஺஺Ḅ/0⚣᳛1000Hzஹ%OdBḄ☢ḄE$ᙳuᔜqo᝞%120dB,ᔜKqo¢£/0EᨵᦔXᑮE¥¦Ḅᦪ¨ᵨªឋ¬®¯◤⌕qᜧḄ%SPL()ᵫSPL=201og±-(p]=2x10-5)p=p\0c.|()paerefPrefᑣ)³=´Eᓃ=µPoco¶=%ᙳuL=⎃.(l)SPL=0dBp=2.828x10-5pav=6.815x10-8m/s=1.085x10-"mua£=2.813xIO_15J/m3.(2)SPL=120dB=28.28pav=0.0682m/s=1.085xIO-5mf=2.813xIO-3J/m3.fl(3)ᓃ=-^=c°=%=ᑣSPL=201og“)º=197dB.PoCOPref4-11ᙠ20CḄ/0ᨵP☢»¼ᐸ%74Ohᐸᨵᦔஹᙳu¾஺()%SPL=201g/L=7&dB),Prefᨵᦔ%=0.1(¿a),ᙳu£==°T«6.9X10-8(/.-3),PoR415x344

36/=Á0=-^«2.4X10-5(W-5-2)O᜛0஺04-12᝞ᙠÃ/0ᐹᨵ¦᪵Ḅ☢EiÃÆÇ/0ᜧqoÈ()Ã☢Eᓃ“`

3745,+&1ᦪ67*1,PR+R2./0&1ᦪ=*2ᔩE==93;஺1.21X10-3஺APIJ2P\3R2P(8+&)24-16(@ABḄᱯឋFᢙᑖ1.48x106P/slm3.2xl06P-s/m,Hᵫ(ᚖ$ᐭ&'ABa*IᙠᑖK☢)+&,Lᐭ&,MN/0&1ᦪ஺45(ḄᱯឋFᢙO=1.48xIO6P-s/maABḄᱯឋFᢙ&=3.2x106P-slmaRᵫ(ᚖ$ᐭ&'AB*IᙠᑖK☢)+&,Lᐭ&,MN/0&1ᦪS=4=,5Tஹ2.08641(%ᓝY2)4-17ᵫ!"[[=30஺\ᐭ&'(]I^_ᢚ&abᜧcᑖK☢)+&,'ᐭ&,MNbdcᙳfgh0&1ᦪbdc45sin'=lm⊤o=p^r/S,_j483m/5sin.c2i4«3x£clsineᔳSin30rᡠ[}~ᐰ+&j344+&,'ᐭ&,MNr'==1ᙳfgh0&1ᦪ0,==ocos^.4-18^H!"]1mmḄ200Hz2000HzḄ/0&1ᦪ஺(ὃ⇋ᚖ$ᐭ&).45ᵫ(4-10-41)o/0&1ᦪt=______________4______________.14cos2kD+(R+/?)2sin2kD2i2212(l)f=200Hz*Ik,=@=2%I20°=02889,,஺=2.889x101'c4350~ᵫ'᝕2஺1IUl,sin&£)a0,^>t,«1.ফf=2000Hz*Iᑖ᪆)Ir,«1.4-19!"]ᨵ;ᩈI஻I^_⚣᳛¢ḄḄ◞gᨵbdc

3845◞g77,=T2+201g/+201gMᐸ]¥⊤¦ᩈḄ§¨஺4-20;©ª〈¬ᘤḄ᜜¯ᵨḄ±²ᡂI^H´᜜¯1000"z"ªḄ◞g஺45'Iᐸ¨஺=1஻?µ=10-3µIp=7.70xl03)lg/w\c=3.70xl03m/sR=pc=2SA9x1Q6N-s/mi,M=pD=7Jkg/m2'!"7?-pc=4l5N-s/m?,0ooᑣᵨ^^=—<0.5(0=2·7=20007¸)RA2coᑣᡠH◞gTL=101ogl01+(¹º=35.3154-21»¼◞ᜋ¨20cm,§¨P=2000kg/n?,^H100Hz1000HzḄ◞gᑖbdc᝞ᜋḄ¨¿µ;ÀI100HzḄ◞gbdc᝞Á¿µ¨IÃÂᵨÄᩞᧇᑗᡂÈÉᜋI]¼Ê10cm,´*100HzḄ◞gbdc45ᵫgËÌTL=-42+20᝘20/gM2,ÎTLi=-42+20/gl00+20/g(0.2x200)=50dBTL=-42+20/gl000+20/g(0.2x200)=70dB2ᜋ¨¿µ;ÀIᓽD=0.4m,ᦑÑ*TLi=-42+20/gl00+20/g(0.4x200)=56dB1ÈÉᜋ*”=ÓÔ+20ÕÖ5=43dB4-23^ª¸×ÉØḄ/0&1ᦪ(4-10-43)Ù஺45Ú;¨஺IᱯឋFᢙ&=2஺2Ḅ]¼ÉØÛ'ᱯឋFᢙ4=0£LÜ3=஺3஺3]I᝞Ýᡠ¦஺-/("<)PÞPkzಘPn\r-“nI”Pᱏ"…ᑣ)-n3à+3)tUI/-Pint_i[(ot-k(x-D)]-nneyPn2rE஻n2ra°Pt-33…

39ᐸ]I);äL,);_A1n.[)-12fa..__/2ra1);¸ᓝ4;;;U2r-02a-4;Kj/\|liDA-,DK)/D<3Pia+Pim=P2+P2HPa+Pg=஻2m+P2,1aRx=0*,\Pi.Pin,_Plr.পDa+Nm=O2m+02a7?iR]R,/?2஺2Þ஺+02.éJpgRX=O*,Pl,+P2r=P,ᓽì\P2mM_Pi^eḄ஺_P^(2)o,+u=u22rtR&&2ᵫ(1)Î2&᜜=(R1+6)p2-ï;&)p2mবKlP2,a=!PB”ᵫফÎID'ভó(4)ôᐭ(3)Îᑣõ=|________________÷________________p\|øL+ùúø&+4óḄ஺;øN—ýúø/?3-&ó["iaᑣþ[ÿ=--------------F---------1Pial6(&+6)2cos2kஹD+(+^^)2sin2kD2-Rஹ4-24ᨵ⚣᳛ḄᑡḄᑖ⊤"#Pi=PH,cos@/-ᓃx-%,Pi-Piacos*fyr-kx~epf,./0123᜜56#7ᦪ9:Ḅᔠᡂ=Ḅ>ᙳ@ABC-222DEᵫ⚪HI.ᑡJ1ᐵḄᵫ*4-12-11NIᔠᡂ=Ḅ>ᙳ@ABC#2.2-Pla+“2஻o—o1τo2—2•2Poeb4-259RSᐭUVWUXY1ZḄ>ᙳ[=\Ḅ>ᙳ@ABC஺DEᐭUVWU⚣᳛1^ᐭU#p,=pa"0"**,WU#p,=஺ᔠᡂḄ=#P-Pt+P,-2p“coskxeJMo>ᙳ@ABC£=Q%c°sfx'=f©os?kx2AlebPoco4-26^ᨵklxmᔣḄ>☢[ᐸ[⊤"#p=qrIp=e2;9:s[=Ḅ>ᙳ@ABCtu>ᙳ@AvBC*wN/0raPia

40DEᵫ⚪Hxp=p/E*)+p/M"=+P,/“+|,ᑡḄ12}(p=(-kx--)--2kx--2292ᑡḄ>ᙳ@ABCᑖ#K=*y=—%2Poeo2/?0஺0222s[=Ḅ>ᙳ@ABC=+&+2cose=_&+—⎃+&COS(-2-)=஺஺஺02pZo2Poe°஺0஺02-^■1l+cos(2fcc+)=-^y(l-sin2᝕)᜛()஺0L2_Po,os[=Ḅ>ᙳ@AvBC/=&o=N-(l-sin2Zx)ZV'o4-279᛻40dB,q¡¢ᙠ2¤¥¦§Ḅ70dB,9©¤ªs2¤¥Ḅ«ᘤᦈᑮḄt#°±²᝞´#70dB,tµ#°±²p2¶DE(1)Lp=l()lgf=ᓃ2=%2.10¹Pref4070ᡠ²2=Pj+P2=2/•(1010+10¹)2ep24070t(=10✂½=10¾10¹+106¿70dB%p27070(2)tÀᡝ=10ÂÃ=10ᵯ(10¹+10¹)஺73dB7Pref4-28ÆÇᑁᵫ஻ÊËᔜÍÎᐵᙢᨽÑᎷ᝞ÓÊËᓫÕÖᙠ2¤ᙳ¦§Lj(dB)ḄØÙÚ஻ÊËÖᨽÑÖᙠs2¤¥tÛ#°±²DE஻ᔜËÖᨽÑḄØJÜ1ᐵḄÝÞ@Aßàáᳮ.ᵫ(4-12-14)xs2¤¥t#=10logio5)+4(dB).ä⚪55-1ᨵkåᙠæçèkéᔾᩞᧇíᵨ⚣᳛#500஻zḄ>☢xå\Ḅ[ðGZª10,òóôõᩞᧇ⊤☢0.25öᜐøíùkÊ᩽ûü.9:sᔾᩞᧇḄýᔣþᢙ᳛ᔣᔾᦪ.ᵫ(5T-9)

41ᐸCo=344m/s,/=500”z%&cr=0.453஺*+,ᦪᓃ./=.0123ᔣ4ᢙ᳛Z,=—A—pc=401.6+7321.8oo1—r”e4¢஺0%ᔣᔾᦪa==0.87(4+A)CO)2+XC5-2DEᙠGHᨵJKLḄN2OPḄ*᩽ᜧST᩽USVWḄXY஺Z[GHᨵJKLḄN2k(x+a—)=±(2n+1)K(஻=0,1,2,…)_*ᨵ᩽US42&(1+0()=±2஻ᐔ(஻=0,1,2,…)_*ᨵ᩽ᜧSc஻=0,N*᩽USḄdef(-X)min=(l+b)WN*᩽ᜧSḄdef(-X)max=b(ᑣOP*᩽ᜧST᩽USVWḄXYf5-3nᙠ☢pfSḄNḄGHrs☢pfS1Ḅtuvw2᝞yᡠ{2Ꮇ}tu~fMm,ḄឋᦪfKm,4U3ᶍ஺DENḄ*+,ᦪ஺5-4nᙠNGHḄឋ஺XYᜐs2yᡠ{,Ḅ☢pTN☢pOfS,Ꮇ}Ḅ_☢pfS஺2Ḅf/,Dᐳv᪀Ḅᐳv⚣᳛fC஺271\Dlᐸ஺=f᳛஺SVDS᪀ῚḄ22A)c஺A)°o~£ᜐ,So01ᐳv⚣᳛fr5.5nᐳvᔾ᪀Ḅ¤~0¥஺¦§ᐸ_*R'=R"+᜛OCQ/S஺D®T(5—1

42-28)¯ᦔ஺£M”:R'=R.+p°c°/Sᐸ~"஻=²24”=³´´2C'=—µ=£SoSPQCQPO°Oᐳv⚣᳛co=2·=rPo?J|i)4+124஺(4+1)ᐸ(¸=¹="%)f,£5-6nᙠNGHsᐳvᔾ᪀25—4⚪Ḅy2¼£ᐸᐳv⚣᳛f500Hz,½Ὶ¾O=5cm,Ꮇn⌕Eᔾ᪀Ḅᔾ⚣ÀÁf2,DE᪀Ḅ4᳛Âxsᙠ⚣᳛f250,500,1000HzÃḄᔾᦪ.ᵫ(5-1-30)£ᔾ⚣ÀÁf4-Z2=Äs2ᵫ1QR=’.QR22ᵫÅÆ(5-1-28)£Q=---------------;R(1+xyinDsx_j_________τ]=338'2TTDQR27ufDQ0.5x2x3.14x0.05x500Rᐳvᔾᦪ%=4Ç,=0.70,ᵫ(5-1-29)£a==sÈ——(1+ᓃ)2z2+[(z2-l)0J2É/=250Hz,z=0.5,a=0.45CÉ/=500Hz,z=l,a=0.70CÉ/=1000Hz,z=2,a=0.45.5-8nᙠ☢pf2ḄNᐙᨵgqḄË2Ìᙠ☢pf⎃ḄNᐙᨵ02c2ḄË2ÌÎ᪷Nwᵨ᩽ↈḄᩞᧇ◞Õ2Ꮇ}Ö×5NØᩭ2TNÚÛÜ▲2yᡠ{2DEᙠᡭNḄß᳛à,ᦪ஺

43vi-ePi=Ae^-^᜛£nᑣãV'PCp,=Ce-ᓃ=//â-5'᜛2c2ᙠᑖæ☢ᜐ²çè*éêëpìéêḄíæᩩï'A+8=Csn(————)5)=-^-s)2P,C,02c23ðñ*à,ᦪft=-=—”!sASi+Sz^S'PR~^—s2ß᳛à,ᦪf.=£=2᜛2C2=4sls21Q2c21$4q(22c2^+஺©⎃)s28Gl5-9D÷ñSi2=10T,2=5Îøùú᡽üNýᘤḄýTL(kl)Ḅᓄ஺(1)S12=10,S1=0.12ᡠ"I=101g[l+(10-0.1)2sin2=ioig(i+24.5O25sin2%(dB)(2)Si2=5,SI=0.22ᡠT4=101g[l+(5—0.2)22*=i()]g(i+5.76sin2kl)(dB)sin./0TL(kl)ᙠ34ᕜ6[0,7Ḅᓄ᝞95-10:ᙠ3;<=⍝?@AḼ3⚣᳛E1000”zḄ/HI/JKE10078.MNᜓPᵨ᡽ST./ᘤ,VW/X.Y20ᑖ[,\]᡽S=Ḅ^_,᡽S=`a=Ḅ☢cde᝞f:gh᪷jkT(5-2-11)᪷jl▭noep஺qrs0tI᡽Sds0t஺u0=(2஻-1)4wI./0xᑮ᩽ᜧrI4᡽S=^_D=—=—=3M=0.086(???)44/4000iqwIᵫ20=ᵫlg[l+—(2-S21)2]S]2=-=19.95o4S1

44Iu᡽S=^q0.086m,᡽S=`a=☢☢cdE19.95wIV/X.Y20஺5-12\ᙠg/ᡡwIᐳT./ᘤḄ./0kTEᐸ?஺᜛0஺0ᵫT(5-3-7)(5-3-9)IᐳT./ᘤḄ./0kTE22-0஺0]-0஺0R229☢3Tᑁᑖᓄ¡I¢3?ᔜᐗ¥ᙳ◀ᒹ©Iª«ᑏE43+X4S-l+4x$Pocoᐸ?IXb="b03=ᗂ2Mbeb-D=¯Q2-1)IᑣcoCcoCcoVbbb±ᔜT²ᐭ./0kT´µᓽ«ᑮ஺5-15ᨵ3᝞¸ᡠ¹Ḅº⁚᡽S=I¼½¾Ḅ^EL=Z,1,=¿Ih=4,a=☢cES,À᡽244S=☢cÁES”\Â./0TL஺ᑖÃᙠ40,/“2,/3ᜐ᪷j/JÅÆÇcÈ_ÅÆᑡÊËIᓽ«Ì./0TL஺ÍËᶍ஺5-18ᙠ⚪ḄÐᗕÒ3☢cÓÔḄÕÖ/×IᐸØ⚣᳛E1000Hz,᝞Ù¼½ᔣÐ?ÛÜḄÝᙳ/Þ᳛E1W,\ÂÕÖ/×ḄßàáI᝞Ù±ÐâᣵIVÕÖäå3ᙽᜧḄçèIéêÕÖḄßàáëᢝíI\]îw½ᔣïÛÜðñÝᙳ/Þ᳛h(1)ᵫ(5-5-7)S(x)=SoTv,ᑣS='lnò=Ini00=4.6052.xISoᢣᦪÐḄõ⚣᳛ö=%^=126ÌI/×⚣᳛/=1000Hz»,ᵫ(5-5-19)«/×ḄÈ_á4%=1.97m/s,ᑣßàáEù="=3.13x10——.(Dফ3=û=0.37<0.5,Cᑣ/×ḄÝᙳÛÜÞ᳛Eᑐ=0oC°So(᱐0)2%2=0.0673W.5-25ᨵ3þÿᑁᐙḄ☢4x4=0.1x0.08/ᙠᨵ⚣᳛

451000~2000ḄḄ▲஺#$%&'Ḅ()*+,1000஻z?@☢ABCDEFGḼḄ7☢'(1,0)8I8'஺5-27ᎷKᙠLMḄz=0ᜐḄOᑖQ"Q)=%sin“x"3’#RSTUVW'ḄXY஺Z[&()Ḅ'ḄM\஻5=A,«cosaxcosZ)ej““Fz)vᙠZ=஺ᜐ=4”,coskxcoskyxy_ᙠz=0ᜐw(r)=wsin\-xeJMoᑣ%=TT(u°sinTxdxdy=2V4b%k*"vᑣ(1)de(0,0)8VW'cz=c°(2)de(1,0)8VW'c(3)de(0,1)8VW'c.,¥¦/f⚪66-1deᾭᳫᙠjkkro<<1Ḅ*+l᝞nᳫopqrᩭtuv⊤☢Ox⚣᳛yzᢝA|#}ᐸDXtuᑖ᝞ᙠkro<<1Ḅ*+lnᳫopqrᩭtuvO

46A|⚣᳛A|#}XtuᑖZ[XP=-j('l1-kr)=P/M+᝕+er+(>)2](I),1.P=rᳫopqrᩭtuvᓽP=/…rᡠ=201g᠒=201g2+201g4PrefPrefᦑDXtu201g4=12dB(2),>>1.P=3“"eJ(M-kr)rᳫopqrᩭtuvᓽP'=22be"”'-5=2Prᡠ(=201g=201g2+201g2PrefPrefᦑDXtu201g2=6dB6-2Kᾭᳫ&Ḅᙢ3ὃ#R2r,",10/■¡¢£¤ḄX¥¦§¡eᑖ¨©ὅᳫ1mx10mḄᙢ3ᑖ«¬᪵ḄV=lm,¨©ᑮḄX¥Ḅ|ᓄ±¡ᔩ᝞A¡}ᔜ¡eZ[ᾭᳫ&ᑖ«nஹr2S<-2)ḄµX¥¦§(1),n=r,ᔆ2=2/■.A£=201ogio2=6dB·r2=4r.AL=201ogio4=12dB·2=10r.AL=201ogiolO=20dB.(2),±=n+l,¸=1.AZ=201ogio2=6dB·n=100.¹L=201ogioL01=0.086dB஺6-3º»ᾭᳫop0.01m,ᔣ&D⚣᳛1000”zḄ'K⊤☢OY¼0.05m/s,Rᳫ50±ᜐḄXxX¥½ᜐ¾¢¬Y¼ஹO¿Y¼DÀ᳛Z[ᳫ☢'X⊤Á\஻=4/Â)

47ᐸ&4=ÂÄÅ+j)=/‘;1+(ÉÊ11[A|=Ðu,0=arctan(—)஺11aÎÏKᐭᦪ¼ÙÚÛÜ=0.037(Pa-m),8=79.65°Rᳫ50,%ᜐḄXp=—=7.4x104PaarX¥SPL=201g4=201g'4Xi஺_=28.35(ì)p%/2x2xlO-2KfO¿Y¼ᓃ='+("-=1.78x10-6(ἔ/s)Polkr¢¬Y¼%=%=2.83x1()T°(u)CODÀ᳛ö.=[R,%=·c°^"SoW=2.10x10-5”)A)?6-4&opþḄᾭᳫD/HzḄᙠᳫḄᙢᑮ4ᳫ⊤☢Ḅ!᳛ᜧ$%ᵫL=201Og-^-2=P.•IO'4ᑣPa=&Pe=0%fl஺%p10PrefAB=§¨ব";p,=14,(E=2=)J1+(I)Aᔆ/%6-5MNOPὅᙠOPR!᳛S.=10-3U᝞WXὡZ[R\ᑮ]^Ḅᨬ`ᨵᦔp=0.1Pa,cᙠd▲fghZijkOPὅlmḄᨬᜧj஺e$%!᳛n=4^2opᐭᦪ%஺0஺0%r=1.82(/M),uvᨬᜧj1.82m஺6-7xy0.005mḄᾭ|ᳫᔣf~hf=100HzRḄᳫ⊤☢0.008m/s,c!᳛஺

48$%ᙳ!᳛=B2,ᓽPocoᵫ)=`=2ixl00*0.QQ5«9.13x10~3«1°0344rᡠU=2o/42q4a“2«3.49xlO~10(J)6-8Mᨵxy0.005Ḅᾭ|ᳫh15c7஻ᳫ☢ᙳᒴ஻=0.00``!᳛¡6-7⚪¤W¥¦§¨©ª«$%`ᳫ!᳛ᐸh%%=0.005/=0.15஺6-10⚣᳛100Hz,!᳛0.1WḄ°±ᙠ²³Ḅ´☢▬¶Ḅf~hc%(1)ᙠj1km¸ᜐ´☢▬¶Ḅº(2)j1kmᚖ¼½ᜐḄ஺$%ᵫ(6-1-22)W=£^|AÀ==8.13Pa.(1)uÁ²³Ḅ´☢´☢▬¶ÃÄḄÅÆÇÈj1kmᜐ°Ḅp=—=0.008pa.(lr(2)´Éf~ÁÊÉËÌÍlᎷMᚖ¼ᐭᑮ´☢ḄÆÇᐰÈÐᎷMÁÑÒ¶´☢ḄÀI%=*=0.163pa.6-11⚣᳛BஹÔᑖÖQoiØ஺°?ḄB|°/᣸ᑡ᝞Ý6Tlᡠß஺à¨jѸᜐḄ$%ᙠ°PḄᨵ0=P]+/?2ᐸh4.P&M(~+j),j=1,2஺1+(I©ã஺É°kr«1,uvlA,«pckr§u'j஺oooajkp^jkPoC஺*j((ot-kf2)(*)஻NMiC-i149C\rzr\r2ᙠjѸᜐᨵ

49r=r-A,=r+Axᐸhä=—COS0o2jrlå஺o=4æ%ä=—cosdpᐭç*èé6-12⚣᳛BÔᑖÖ஺Ø஺02Ḅ|°/᣸ᑡ᝞Wê0|=-஺஺2,ᓽ°ëᡂᏔ᩽ïà¨ᡠḄ¤W¡ç6-2-3èéB஺᝞WêQoi=QmᓽðÔḄB°,à¨ᡠ¤W¡ç6-3-2èB஺$%ç1èña|=N஺஺2Rr«r+—cos0,r«r--cos02-2M°iᙠPᜐòÇPi,°nᙠpᜐòÇ02,ᙠ°pPoᐸh4=;^ᐺ¡çö|+»ç%᝞ø1è1+ç5è~jp^krmu\a=jùᙠGoiçGm=4ûü஻ᐸh&=+jèçý2ø1è1+çþè2è«jPoCOkrO2U2a=J22çQo2=4^rO2U2«4%=./ÿa3J*"-/"&=r;51=-©2f4"=4ejg_2/singcos஺ᐸA=1/•=jpckr^uoo[ar242=஺02=jQgj…}k2^e+"6=r2“rঞ=2,2eAk!1=஽j-t-krcos'cos0)*=±sinee2r22=,ᐸA./0=1230“rsin446-13567⚣᳛:3;<:=:>?@ḄBC;:DE/ḄFGHICJ஺2

50Pr>KLMqaᔆOgsinB,r«r+-sin<9,PQRᑖTஹ2Vᵨ஻ᩭZ[ᑣ22P=jSo஺஺஺ejew,-krf**+e-□,)A='sin64஻r26-14^_᝞aᡠcḄdefᑖg☢iᏔ᩽lḄFGHICJEp=j2M&os஺-e~ikrcosekDcosOfe^.rKLᵫnopᳮrdefsgeC;Ḅtu=ᦔwO7x:ḄḄyC;.ᵫCJ{|pᳮ}FG~pB}CJ⊤Eᵞrh3DDD3Dᐹr«r------coso*,r«r-----cosd,r«rH——cosr«rH-----cos.+22+22ὃ⇋FGḄCJᓽᎷr>ு஺ᑣᵫ7ᳫ;HIḄCᑮBpPQ?VᵨZ[r+,ᵨr,e:>Ḅ?ᶍ.kDkDᵫw஺<<1,.Vsinwcos஺¡¢E-^-cos஺ᵫ£A¤=2.jজ©os஺•2cos«Dcos஺ᵫ£¦§}^.6-15^_᝞aᡠcḄ¨ឋª☢iᏔ᩽lḄFGHICJE^_Lᵫnopᳮrde«sgeC;Ḅtu=ᦔwO73:ḄḄyC;஺᪷3:ᳫCG{|ᑖ}67:D3DḄ®:ᳫCG67:DDḄ¯:ᳫCGᑣFGP=P\+P=°6"""".[cos±2cos஺Ocosg^cos஺]2Msin³cos஺a´cos஺ᦑ}22ᓽ}^஺6-16ᵫC¶ᢣᔣᱯឋ6-3-23º»,^_¼½ELḄᙳᒴÀÁC;ḄᢣᔣᱯឋEsin——sin஺AW=—sin0A^_Lᵫn7ÂÃĽ:=:>:366:D/ḄᾭÆᳫ;ÇᡂḄC¶ḄᢣᔣᱯឋE

51¼½ELḄᙳᒴÀÁC;ᑭᵨ᩽▲ÀÁC;=ᦔE஻஻-87ᾭÆᳫ;஺^Ì஺6-18ÍᵨB;ÇᔠḄÏÐ5Kᨵ▲¼ÁC;ᙳᒴHIḄCJ஺KLᵫB;ÇᔠÐVÁC;ÒᡂÓᦪ7BC;ḄÇᔠ.✌ᐜ×Ø~BC;ᙠBpᜐÜḄCJLpG,y)=3""஻"ᐸ1á+বߟä.riᵫCJḄ{|pᳮ}ÁC;ᙠpBḄCJE:=:_____Awt-k/d+(y_%)2J-//2Ji+(y_y,.)26-19᝞Oᑡê¼Ḅëì¡¢ÒíÓ▲¼ÁC;ᓫ>¼½ḄCï᳛Eðᙢ☢ECò¨ឋó☢5DôëìᚖÀDôᜐḄpö×ëìḄ÷Æø§ùú“Ḅᐵü஺ýcLr=r,cos^,0dxcos0=rdOx᝞ᡠ✌ḄᚖFḄᜳᑖ"#4%஺2஺()*+ᐗdx/ro-rtcosO,dxcos0=rdOx0dxcose=5ᐭ789:ᑖ;0<=>▲@ᑣᨵq=—E᜛=G122IJK;P,MḄᐵO#6-20᝞0PQ<=ᨵ▲@RSᓫU@V;RW᳛#Y,ᙢ☢#R\]ឋ_☢✌Ḅᜳ`abᚖ%ᑖ"#Y%«,efᚖgefrᜐ;pl`mnḄop,20qrp=14e"s,p,=trv2r

52ᑣpl=WPo?/x="tana,dx-rsec2adaa'^7ir6-21ᨵ)yz#a{ᙊ}RS~RW᳛#W,)☢ᐗ{RW᳛ḄUᓾ{>ᔜm஺RSzᜐḄ__ᙳR஺)☢ᐗU{>ᔜmḄIJ~__ᙳR2=)16-22ᨵ)gz#30cm£¤¥Rᘤ§ᙠ>▲ᜧª«ᔣ®R¯ᎷK±<={²³´pᑖ"µᙠ100Hz1000Hz·Ḅᢣᔣឋ஺¹º1000Hz·»R¼½V#¾¿ÀJ¥RᘤÁÂefz,#¾¿ÀÃ.)(P)—()asin2)(PA)6=OkasmOZ=^^=0.0183/,yza=-=QA5mo2/=100Hz,A:,=1.83,%=0.27<1Ð=1000Hz,&=18.3,&2a=2.7Ò3=᝞P348(0,S)6-24²³⊤☢Ḅ´Õ##qrf²³Ö×ᜐḄR#Ø.(…a2J„,(/casing)+P~J~7~(kasin஺ªi°qr☢ᐗᙠPÞßḄR#à=2jdia᦮â²³⊤☢:ᑖK;᦮â²³ḄR#P=\\dp=\\jὮ%*…dS(*)ãK<ᨵAh2=r2+p2-2rpcos(p,r),ᙠf²³Ö×ᜐᨵ/•ுுa,æᑣKPQ#ᵫ᪆éêK;

53b{(*)æKᓄ#P=j®Lei"£0(1-ï)"eᓽsin%0S"d0(**)ñò³óôᦪᨵöᑡឋøJo(x)=ùúeûüᓽJ(ý=j(ýXn+xþÿឋ(**)ᑖ6-2615caḄᙠ▲ᜧ#$ᔣ&'()*+,-./0=0.002m/s,9:=300<=>ᜐḄ@*A᳛CD-E஺GHI⚣=*>KḄ/0LM@+,஻“=0.002ZM/S,a=0.15m,z=\m,/?c-415Pa-s/tn,f=300HzooSᨵHk—2^-,R=-Ja2+z2,coVᐭᦪ0YZSPL=65.\dBo[⚪77-1ᨵ^_`ᙌbᘤ*+,ᐸ-eḄᨵᦔ஺=10^2g*-eḄE”,“=2X1()Thg,jᨵ⚣᳛/=300”z,-`mnḄopqLr஺=2,sᙌtKuv/=3w*x◣zx{E|v0B^lWh/m2*Ꮇ~ᨵ⚣᳛100"z,300஻z,1000%ᨵᦔIPaḄ)ᚖᵨᙠ-e,bᘤḄᨵᦔᵯᔜGH.o=100Ḅ)*F=Pa-S=42Pe-7r0.012=4.44x10^(TV)z=^-=—=-஺3003Vᐭᓃ,=------=YZḄᓃ=4.34xKT’(஻?/5),«Mjz2+(z2-l)2^,0D/pLM*ᨵᦔᵯ§=6/%=—#=9.21x10-4(")஺V2D᪵Ḅ«9H¬=300=*E,=5.00x10TV)¬=1000ᔊ=*E=8.10X10-4(V)Oe

547-2ᨵ^_ᵯ¯bᘤ*-eᵫ╅²ᡂ*+,ᐸa=10-2m,´v஻=1()-5m,-eµ¶᩽¸Ḅ¹º஺=10-5m,»wḄ᩽ᓄᵯ&)=200V,Ꮇ~ᨵ^⚣᳛200HzᨵᦔIPaḄ)ᵨᙠ-e*bᘤḄᨵᦔᵯGH5=%஺2=7*(10-2)2¿*h=10-5*O=10-5m,E=200V,f=200HzoM,“=0S/z=8.80xÃxl(T"g,Pe=1p”,Pa=6;P"ᵫF=pSei(M-kr¯F=\F\=pS=y/27rxlO^Naaaᵫ/=ஹ´K,”=4ᐔ2ᡝ%=43.7%Sa="=192x10-5wKn,ᵫ§᧡E;ᗟᜓ…4V7-3ᨵ^È`ᙌbᘤ*+,-eḄᨵᦔa=2xl(?2m.ᎷÉᨵ^⚣᳛4000HzḄ)ᑖÊK(᜜0஺)µᑗK«ᔣ(Í90஺)ᐭ*bᘤᙠMÎÏᐭÐÑÒḄᵯgÈᑖÓ(ÔY⚣ᦣᦔÖ).GbᘤᵯEµ-eḄ×Ø£ḄᐵmHE=*J.ᐸ(஺-eµ¶᩽ܸḄ☟᝱¹º*ßᙠàáܸḄ᩽ᓄᵯ஺-e×Øâ-eᵨoḄᐵmHᡝz.K,“J](&asin61)AL=201og(-5-)=201ogkasin*ᑭᵨ(7-1-5)ÎÏᐭÐÑÒᵯÈ:£1010F2J/Zasina)kasin02ᐸ(a=0஺*ë=90°.ᵫí4=0°,YZ:"msin))=ᵨᑮ:ïðñ9tᑣ.YZALE=2.4dB.kasina7-4ᨵ^ᑭᵨÈõᳮ²ᡂḄ`ᙌbᘤ*-e÷øḄùÈ+,ú=4x10-2m஺ᎷÉbᘤḄopûᦪµ)ḄᵨÐÑD⚪7Tüᐰ^᪵*9bᘤḄᵯ*᝞ÿ⌕ᘤᙠ⚣᳛ᑁᮣ(ᵯᵨ)ᙳᒴᑣᘤ!"#$Ḅ&ᨵ⚣᳛()*+,-./᪵Ḅᦋ23

5556F=\P\kS\cose~+^>-aiᵫ⚪9:b»l,?9ᓄAE,Mak&kcos஺,8Y2Ky=ioo”zQRᐭᦪUVW:cosOxICT'343________F&.zRᐭc=defVW:g=3.18cos6x105(஻z/s)80MMz2+32-1)20,oE«=Blv=pe=6.75cos6>X10-5(V)vwḄVW9:K/=300HzQ,=1.10cos^xl0-3(V)zK/=1000"zQ&=5.80cos6x10T")7-5ᨵe|}ᔣ200HzḄe?ᘤᙠ}0.01m1mᜐd:Ḅᵯᑖ356_£O_(£JN.=0.01஻?c=344m/s,0=2஻/=2஻x200=0()F(Pa)F•••ᵨᙠᘤḄ!¡¢ᢝ¤¥ᓽEJNTPJF§¨="ᑣড2ᵯ=ªK”,C“)FWN%*Bᑣ(%)N©,)N=5=27.4(E“)F©)FA=201g|Ej-201g|E„|.=201g^NᑣyvA·20Ig27.4=28.8487-6eᘤᚖ¹º»¼☢¾¿À(Á0),o¿Ḅ9⊤ÃA஻=2஻aSinAxcosজÇÈ!Éᵨ(Ḅ⊤Ê?ËÌÍᙠ⁚ῳᜐᵨ(Ḅ2ᓄÐÑ.56ᵫ⚪ÒÓ@=2p.cosÖcos×3=0,ØA?ᘤ!ÉÙÚÛ◞ḄÝ.ᵫ?(7-1-7):OXᵨᙠ!ÉḄᔠ(A=-2SNp(kcosZxcoscot.প⁚ᜐsiná=0,ᑣcos᝖=±1,:ᵨ(/=±2SA஻/cosm.(2)ῳᜐsinhr=±1,ᑣcosAx=0,:ᵨ(æ=0.

567-9çeèéᔠ?ᵯêᘤ./᪵ᩭ⌱íᐸ()!"#$)#$ḄïᦪðᘤḄᮣᙠeñòḄ⚣᳛ᑁ¢ᢝᙳᒴḄ⚣᳛ᱯឋ35:#$öVᙠ÷(øùᑴû,üᐸïᦪ&ᨵ⚣᳛/„;⚣ýò()*+,-2ᨵV=BQmḄᐵ#ᡠ⌕Q,ᨵ⚣᳛ᜧᑣᘤḄᮣᙠḄ⚣᳛ᑁᢝᙳᒴḄ⚣᳛ᱯឋ஺7-10ᨵ%&'%()ᔠ+ᵯ-ᘤ./01᪵ᩭ⌱5ᐸ789:;<'8;<Ḅ=ᦪᘤḄᮣᙠḄ⚣᳛ᑁᢝᙳᒴḄ⚣᳛ᱯឋ?@A⌕⌱5=ᦪB8=D=1,ᓽA=cC/?,ᐸFGH9IJKL◞ḄNO஺0aa7-11ᨵPQLRḄS%&+ᘤLNHdTUḄVWXὶLZᵫ\᪀ᡂ)ᔠZ_;<`aTbcd☢fF'gᐭijᔣᡂ஺l᝞nᡠp..rs)ᔠZᦈ;<ḄZᦈᢣᔣᱯឋ஺.@Av%+ᘤANOwḄNOHr,ᑣᘤBNOwḄNOHr+dsind.ᵫ+7-1-5Bxyz{|}w~ḄR᪵〉ᵨcd☢gPQᘤ9Izᵨ7Ḅ⊤+ᑖHp^^ot-kr-kds

57G2J1xzsin஺kas

580ᵫ⚪PQᘤḄVWXὶLZBᵫᢣᔣឋḄB7-13a7-11⚪ḄPQᘤ᡽H஻QᘤTUḄLNHd,.s஻QSᘤ᪀ᡂḄZᦈ;<Ḅᢣᔣᱯឋc72sinJZdcos஺஻sin——cos஺⚪88-1ᨵ=10m*7/4ḄᑁḄdᙳᔾ;ᦪ¢=0.2,.r£ḄJ4dᙳ¤ᵫ¥¦ᦪ'¢§¨x©ᶍ«¬ᔾᦈ஺

59@Adᙳ¤ᵫᡂ¥£NS2(3+/4+1Sa_21+ll+IJc)yyz¦ᦪR1-a1-a¢§¨q=0.161-Sln(l-tt)8-2ᨵ/,.x/x/_=6wx7mx5ÆḄ¢§஺ᑁ◀Èᨵᡧ4m?ḄᩈÌ᜜ᐸÎÏ☢ᵫÐᐝÒvÓÔᡂÐᐝÒÓḄdᙳᔾ;ᦪᙠ250Hz¨H0.01,ᙠ4000Hz¨H0.02,ᩈÌḄdᙳᔾ;ᦪᙠ\×⚣᳛ᑖH0.05'0.1஺ᎷḄÙH20஺஺L|ÚH50%஺.r£¢§ᙠ\P⚣᳛¨Ḅ¢§¨஺@AḄÙH20°஺L|ÙH50%,ᙠ4000ݨ«¬&ᔾᦈ;ᦪ2a=0.006஻ß-_5|à+S?%ᐸFS=214஻?2,S|=210஻J,S=4஻J'S2—210x0.01+4x0.05á/=250ݨ,a==0.0107-210x0.02+4x0.1á/•ndOOOHz¨,a=----------------------=0.02152214<0,2,a?<0.2ᦑ76°=0161-^——;ëV=210"Sa+SaV210á/=250”z¨2aï©ᶍᑣ@=0.161-----------=14.77s60214x0.0107á/=4000Hz¨2a=0.006m-1___________210___________ᑣQ=0.161=3.507s214x0.0215+4x0.006x2108-3ᨵ¢§«¨Ḅ¢§¨H`ᙠᙠóÏ☢zôzõ☢öHS',dᙳᔾ;ᦪHaøḄᔾᩞᧇûüB£¨ᑁḄ¢§¨Hý7.sõᔾᩞᧇḄdᙳᔾ;ᦪïᵨþ+rBAᔾᩞᧇ⌚&="ᔾᩞᧇ⌚஺'="Sa,Sa,ᐸ5-5+%S;S

60/!஺0.161V“0,ஹ0.161V#$Sa=---------,4(S—S')+S'=———i%760f11%&'($S'Q-a)=0.161V(———);%%-'0.161V,11ஹ1ᓽ3n$a,=-Si^60608-4ᨵ+,-40.Ḅ0123456ᐸ7ᙳᔾ9ᦪ-N=0.02,;⌕=>?@AB4ᵨDEᙠ4ᑁH14(06ḄI᝱23KLMN⌕OKPQRS7ᙳT᳛VWXYᶍ[\ᔾᦈS=2(/,/+1L+//)>6²³;=6W7=70.1760/),yyᵨN0_n5aஹ70.176x0.02,2ஹ`abᦪR=------>-----------------=1.432(w-),\-a1-0.024ᵫSPL=101gW+101gpc+94+101g—oQR_SPL-I᝱23KLd/?c=415N-s/m3oo15.358ᦑf210F=34.343(W),ᓽ⌕OgPQḄ7ᙳT᳛-34.343W஺8-5hHBḄiᘤkᙠ+,-VḄ234l$4ᑁḄ23ma-7n஺opᙠqiᘤḄrsᜐḄ23Kᨵᦔv-p,,MwxyiᘤḄ7ᙳPQT᳛#ᵫz&{|—.vW=I0-4pn0—W஺•^60WXᵫo}_£=T$Pc^4~——WPoCOP஺5R~J*-J^Wpc=|⊈=10R0.161VᑣPI0.161VPo°0.161V60Vᑣm=i(r»&K%8-6ᨵ+,-/xX/)X/z=30mXl5mX7mḄᔉᚪ⌕O>ᙠ[mḄ23ma-2s.(1)MO4ᑁḄ7ᙳᔾ9ᦪ.(2)᝞DEᙠyᔉᚪᑮ80dBḄI᝱23KLMN⌕OgPQRS7ᙳT᳛(Ꮇg-ᢣᔣឋḄ)?

61(3)Ꮇᔉᚪᙶ40056Ḅᔾᓫ-Saj=0.5m2,Nym4ᑁḄ23ma-RSV(4)᝞gḄ7ᙳPQT᳛ᢝ¢£¤ym4ᑁI᝱23KL-RSVWXVMX/yXgOX15X7=31500?S=2(lXl+lXl+lX/)=1530m2xyxzy2V—V(1)ᵫ(8-1-10)$nao.161-=,ᑣa=0.161——=0.166.0SaSTM(2)ᵫ(8-1-23)$A¥=303.873n?,\-aᵫ(8-l-27"^SWL=SPL-10log98.8dB.—Sa+400-Sa400x0.5(3)a=----------——=a+=0.2961530ᵫ(8-1-9)$.=0.161——^-^-=0.943dB.SIn(l-a)Sa(4)==644.53Im2\-aSPL=SWL+10log76.7dB.(5)SPL=SWL+101og“C+()ߟ3mmSPL=80.6dBnF10mmSPL=77.3dB.8-7ᨵB¦AḄ§al$4ᑁ23ma-7n஺ᩭ©ª«ᜐᳮᙠᜋ®¯°¯ᔾᩞᧇ4ᑁḄ23ma±²-7n1஺Mwx_§aᑁᙠ«ᜐᳮḄI᝱23maKL³-%=10´µ)஺^604%wxXᵫ¶XR0.161Vᜐᳮ§aḄI᝱23KL#⊤¹-

62SPL=101gm+101gAR+94+101g&᪗-g7ᙳPQT᳛஺«ᜐᳮÃBgPQḄI᝱23KL-SPL'=0.161V_§aᙠ«ᜐᳮḄI᝱23maKL³-8-8lÆᔜÈiᘤḄB#ᙠ234ᑁÉÊË_b◤56234Ḅ`abᦪR஺ᨵᢣᔣឋḄ᪗Îg(ᓽ#56ᐸᙠÏᵫḄÐ|T᳛)ÑÒ234ḄÓÑÔᙠqᐸrÖqᜐᵨlM×ᘤl$ᐸKL-L,ØᙠÃ᪵ÖqrᜐᐸHḄÏᵫKL56-L஺Mwxy234Ḅ`abᦪR#ᵨ᝞zÚ&Û{WX4ᑁÜ-Ý=«Þ1423-pn=à᜛0,0—4Tlzr—2R16%HæIèL-L=101g(l+——)0R8-11ᙠ`abᦪ-201tfḄᜧ`aÓᜐᨵíîgᡂðñ᣸ᑡ᝞ôᡠ¹Ꮇög÷|ø5¥10-2àT᳛ḄùBMNᙠ>úûÑAîḄKLᨵRSVWXgᙠAîḄ7ᙳýþÿᦑᙠAAḄᙳ5X10-2X400X(——?-=-+—)=19.18#x(0)2208-12ᨵ)/xX/,,X/z=6mX5mx4m2345☢789ឋḄ.Ꮇ<ᙠ4ᑁᑖ?@A⚣᳛

6350Hz,100Hz,1000Hz,4000Hz,DE10HzḄFGHIJᑖ?ᙠ4ᑁKLMNOPQRSTUVWv=/.X/>.X/=6X5X4=120m3vzS=2(lXl+lX/+/yX/)=148m2xyxzzL=4(/+/v+/z)=4(6+5+4)=600?vᵫ(826)Yᙠ⚣᳛/▬[Ḅ\⚣DᑁḄOP⚣᳛ᦪ(1)ᡝ50Hz,dN=l_(2)ᡝ100Hz,dN=2_(3)ᡝ1000Hz,dN=133_(4)ᡝ4000Hz,dN=2000.8-13GHᙠ`⚪Ḅbc@ᙠ95Hzd105”z⚣DᑁeᒹghijFSTUVWV=120/,s=148m2,L=6Qm,df=\0Hz(4T᮱2VTtfSL(4KX1002X120Ttxl00xl4860)(cl2c~8c(J134422x344?8x344)(1,1,2)k|/,|=97.0/fe(2,0,2)kಘ=103.4m(2,2,1)k|/,|=99.4Hz(3,0,1)k|X|=96.2Hz(3,1,1)k|/,|=102.1Hz8-17ᙠ)nobcḄ)⚔q`r`stQoḄGuvw᦮bcḄyz{ᨵᦔ}SḄᙳr2Jµ஺0জஹLIm4%%2(¸/),'*x'*y"2ஹ,VWᵫ(8-2-50)Yp=-¶☜jZZு`D”D—ejMt.nVn=0n=0n.I,"%).Qxv(wy,2Jp(x,y,z)dV1(ஹ2JfyJyJyJ^^(2_zy2)dvM2^Qoj%஻20஻஻পᵫAஹ♦Pe_v-ᵞIT/nx7r஻n,ᐔᐹ@+஻“஻=cos-x-cos-—ycos--Z.ᵫqᦪḄPឋkL/z

64Jnxnynzn.nndV=O.ᑣxyz2(2ஹ20஺0Qoজe`Tᐭ(1)TY2=ெVJ¡442)¢))2

当前文档最多预览五页,下载文档查看全文

此文档下载收益归作者所有

当前文档最多预览五页,下载文档查看全文
温馨提示:
1. 部分包含数学公式或PPT动画的文件,查看预览时可能会显示错乱或异常,文件下载后无此问题,请放心下载。
2. 本文档由用户上传,版权归属用户,天天文库负责整理代发布。如果您对本文档版权有争议请及时联系客服。
3. 下载前请仔细阅读文档内容,确认文档内容符合您的需求后进行下载,若出现内容与标题不符可向本站投诉处理。
4. 下载文档时可能由于网络波动等原因无法下载或下载错误,付费完成后未能成功下载的用户请联系客服处理。
最近更新
更多
大家都在看
近期热门
关闭