MEASUREMENT AND ASSESSMENT OF IMPACT SOUND IN THE SAME ROOM. Hans G. Jonasson

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1 MEASUREMENT AND ASSESSMENT OF IMPACT SOUND IN THE SAME ROOM Hans G. Jonasson SP Tchnical Rsarch Institut of Swdn Box 857, SE Borås, Swdn ABSTRACT Drum sound, that is th walking nois in th sam room as th walkr, is a wll-known problm that has bn undr discussion for many yars. It is gnrally rcognizd to b a problm but as yt it has not bn possibl to gt nough agrmnt on th issu in ordr to prpar an intrnational standard. Waiting for intrnational agrmnt Swdn has rcntly introducd a SIS Tchnical Rport spcifying on laboratory and two fild masurmnt mthods. In addition guidlin valus for th assssmnt of th nois ar givn. Th rport can b usd to put up rquirmnts and to vrify th complianc with ths rquirmnts for floors both in th laboratory and th fild. 1. INTRODUCTION 1.1. Background Drum sound, that is th walking nois in th sam room as th walkr, is a wll-known problm that has bn undr discussion for many yars. It is gnrally rcognizd to b a problm but as yt it has not bn possibl to gt nough agrmnt on th issu in ordr to prpar an intrnational standard. Som yars ago th Europan Producrs of aminat Flooring (EPF prpard a tst mthod basd on [, 3] but it was latr withdrawn. Thr is also a Frnch standard, [1]. Work was thn startd within CEN TC 16 but aftr a fw yars th work itm was dltd from th program bcaus of lack of sufficint progrss. It was r-instatd at th last plnary mting in Sptmbr 007. In th mantim it was dcidd to prpar som guidlins in Swdn which would mak it possibl to tst and gt rid of th most noisy floor covrings. For this purpos a SIS Tchnical Rport, [4] has bn issud and th contnts will b prsntd in this papr. Rfrnc to this rport is, howvr, only mad in a not in a Swdish standard, [5]. This mans that it is not a full standard but only a rcommndation. Th laboratory mthod usd is similar to but not idntical to th mthod publishd in th Frnch standard. BNAM008-1

2 1.. Gnral considrations Whn making th tchnical standard th following tchnical considrations wr mad: Th mthod should b simpl and work as wll in th fild as in th laboratory It is a hug advantag if w can us standardizd availabl quipmnt,.g. th tapping machin Th rproducibility has to b good and w hav to gt th sam rsult with diffrnt tapping machins Th masurand is not important as long as th ranking of diffrnt floors is rasonabl W nd a mthod now and not in 10 yars! Th mthod should follow th spirit of th CEN work 1.3. Swdish provisional standard Th SIS Tchnical Rport uss th standardizd ISO tapping machin as sound sourc. It includs thr diffrnt mthods, on laboratory mthod and two fild mthods. Th laboratory mthod is vry similar to th Frnch mthod. Howvr, it also includs ruls on how to corrct masurd impact sound lvls for th nois gnratd by th mchanics of th tapping machin. Th rror du to this background nois is thn dtrmind using th ruls of th ISO Guid for Uncrtainty of Masurmnts. On fild mthod is vry simpl as it only rquirs masurmnt of th impact sound lvl and no corrction of this lvl in cas th room is normally furnishd. Thr is also on mor dtaild mthod which both rquirs th masurmnt of rvrbration tim and corrction for th influnc of th background nois gnratd by th mchanics of th tapping machin. In addition guidlin valus for th assssmnt of drum sound ar givn.. THE SOUND SOURCE Th standardizd tapping machin rfrrd to in ISO 140 parts 6-8 wr chosn although it has bn criticizd by many rsarchrs. Howvr, although it is a bad solution it has on major advantag: It is bttr than all altrnativs! Othr rquirmnts on th th tapping machin ar It has to hav a known sound powr lvl It must not scrn th impact aras mor than ncssary Th bottom facing th floor must not b sound absorbing As to slf-gnratd nois th SIS Tchnical Rport givs guidanc on how to calibrat th tapping machin. An xampl of a tst rig scrning most of th nois from th hammr impacts is giv s figur 1 and. It should b notd that this tst rig is by no mans prfct. Thr will still b som radiation from th nds of th concrt rods which might b of importanc. As thr has not yt bn tim to stimat this radiation th uncrtainty of this calibration mthod is rathr larg. BNAM008-

3 Figur 1. Insid of sand box usd to calibrat th tapping machin. Figur. Outsid of sand box usd to calibrat th tapping machin.. In figur 3 xampls of nois from four diffrnt modls of tapping machins masurd with th tst rig shown ar givn whn tapping on bar concrt. BNAM008-3

4 WA judffktnivå, db NOR 11,w=81 B&K 304,w=7 B&K 307,w=73 NOR 77,w=70 Frkvns, Hz Figur 3. Sound powr lvls of slf-gnratd nois from 4 diffrnt tapping machins. 3. ABORATORY MEASUREMENTS Th masur in th laboratory is th normalizd impact lvl, xcluding slf-gnratd nois, on a flooring in th mission room on a standardizd concrt floor according to ISO 717-, [6], dfind by: n,, s = 10lg10 0,1, 0,1 n n 0,1 ( + n r,0 b (1 whr n Normalizd impact lvl with flooring in mission room xcluding slf-gnratd nois; Normalizd impact lvl with flooring in rciving room r,0 Normalizd impact lvl from rfrnc slab dfind in EN ISO 717-; b Normalizd impact lvl from bar floor, assumd to b qual on top and blow, but masurd blow with ngligibl slf-gnratd nois. n, ham (, + 10lg 1 10 = ( BNAM008-4

5 Whr th normalizd impact lvl of th slf-gnratd nois is givn by 4 A,,, 10 lg + 10lg n ham = W ham + = W 4 (3 A A0 4. MEASUREMENT UNCERTAINTY DUE TO BACKGROUND NOISE On of th most important uncrtainty componnts is th influnc of slf-gnratd background nois. It is dalt with according to th principls of th ISO GUM, [7]. c rs ( 10 = + 10lg 1 (4 rs 10 = = 1+ (5 rs 1 10 c rs rs 10 = = (6 rs 1 10 rs u = c u + c u (7 rs rs 5. FIED MEASUREMENTS In situ th standardizd impact sound prssur lvl in th sam room is usd. Thr ar two mthods in th SIS Tchnical Rport: on nginring mthod rquiring masurmnt of th rvrbration tim and on survy mthod with ithr no corrction or a dfault corrction. Th nginnring mthod, but not th survy mthods, corrcts for th slf-gnratd nois of th tapping machin. For th nginring mthod w gt T = nt, 10lg (8 T0 whr T 0 = 0,5 s and th prim sign indicats that th masurd lvl includs slf-gnratd nois of th tapping machin. Aftr corrction w gt, nt, nt, nt ( 10 nt = + 10lg 1 (9 BNAM008-5

6 whr nt 4 T T 4 T0 = + = + W 10lg 10lg W 10lg (10 0,16 V T0 0,16 V V bing th volum of th mission room. For th survy mthod no corrction is mad for slf-gnratd nois. For furnishd rooms or rooms with acoustic tratmnt no corrction is mad for sound absorption. Thus th masur is ', = (11 nt In unfurnishd rooms without acoustic tratmnt 3 db is subtractd, that is 3 (1 ' nt, = 6. GUIDANCE VAUES In th laboratory floor covrings on concrt floors can b ratd according to tabl 1. Sound class C corrsponds to minimum rquirmnts yilding accptabl nois lvls whras B and A yild a highr standard. Tabl 1 Rating in th laboratory Sound class Rquirmnt,s,w argst incras of drum sound lvl whn masurd on a bar rfrnc 1 cm thick concrt floor, Δ,s,w C 84 db < 6 db B 80 db < db A 76 db < - db Tabl. Highst impact sound lvl in th sam room Car rooms, offics, hotls and rstaurants Standardizd impact sound lvl in th sam room nt,w db Sound class Typ of spac A B C D All spacs with floor ara > 30 m whr popl constantly dwll BNAM008-6

7 Tabl 3. Highst impact sound lvl in th sam room Rooms for ducation Standardizd impact sound lvl in th sam room nt,w db Sound class Typ of spac A B C D ctur rooms or larg spacs for joint gathrings Othr spacs with floor ara > 30 m whr popl constantly dwll REFERENCES [1] Frnch standard NF S , Acoustics Masurmnt of sound insulation in buildings and of building lmnts aboratory masurmnt of in room impact nois by floor covring put in this room [] A_C Johansso E. Nilsso Masurmnt of drum sound NT , Rport TVBA-317, TH, Enginring acoustics [3] A-C Johansso Drum sound from floor covrings Objctiv and subjctiv assssmnt, dissrtatio und Univrsity, 005, ISBN: , ISSN: [4] SIS-TR 007:15 Riktlinjr för mätning och bdömning av stgljud i samma rum [5] SS 568 Byggakustik judklassning av utrymmn i byggnadr Vårdlokalr, undrvisningslokalr, förskolor och fritidshm, kontor, hotll och rstaurangr [6] SS-EN ISO 717-, Building acoustics Rating of sound insulation in buildings and for building lmnts Part : Impact sound insulation [7] Guid to th xprssion of uncrtainty in masurmnts (GUM, BIPM/IEC/IFCC/ISO/IUPAC/IUPAP/OIM, 1993 (corrctd and rprintd 1995 BNAM008-7

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