EP 1704306 A1 20060927 - A METHOD FOR REDUCING NOISE OF A HIGH POWER COMBUSTION ENGINE
Title (en)
A METHOD FOR REDUCING NOISE OF A HIGH POWER COMBUSTION ENGINE
Title (de)
VERFAHREN ZUR REDUZIERUNG VON LÄRM EINES HOCHLEISTUNGS-VERBRENNUNGSMOTORS
Title (fr)
PROCEDE PERMETTANT DE REDUIRE LE BRUIT D'UN MOTEUR A COMBUSTION DE GRANDE PUISSANCE
Publication
Application
Priority
- SE 2004001898 W 20041216
- SE 0303613 A 20031231
Abstract (en)
[origin: WO2005064127A1] A sound reduction system for reducing noise from a high power combustion engine is supplied by means of a method. The sound reduction system comprises a plurality of elements and attenuating devices placed in an elongated channel.During design of the sound reduction system one makes use of a particular suitable attenuating element with a first reactive part, a second reactive part and a third reactive part. Such a module, which is less sensitive to position in the channel, cost effective to manufacture and cost effective to model, is combined with single attenuating devices. The method enables a user to meet the requirements on sound reduction and keeping construction costs down, by using an iterative step-by-step approach. Such an approach is unknown according to traditional methods. An advantage of the method is that it enables an accurate acoustic model of the complete exhaust system, not only in the low frequency area and in the upper frequency area, but also in the intermediate frequency area.The method provides efficient modeling of an exhaust system and enables that a desired noise level close to the outlet of the exhaust system is met.
IPC 8 full level
F01N 1/00 (2006.01); F01N 13/02 (2010.01)
CPC (source: EP US)
F01N 1/00 (2013.01 - EP US); F01N 13/02 (2013.01 - EP US)
Citation (search report)
See references of WO 2005064127A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005064127 A1 20050714; AT E365266 T1 20070715; DE 602004007163 D1 20070802; DE 602004007163 T2 20080221; EP 1704306 A1 20060927; EP 1704306 B1 20070620; SE 0303613 D0 20031231; SE 0303613 L 20050701; SE 526680 C2 20051025; US 2007240933 A1 20071018
DOCDB simple family (application)
SE 2004001898 W 20041216; AT 04809071 T 20041216; DE 602004007163 T 20041216; EP 04809071 A 20041216; SE 0303613 A 20031231; US 58468704 A 20041216