发明名称 |
Silencer arrangement for combustion engines. |
摘要 |
<p>A silencer arrangement for a combustion engine (1) whose exhaust gases are discharged via a exhaust pipe (3) comprises a microphone (9), a tachometer (11) for the engine speed, a control unit (13) and a loudspeaker enclosure (19). The loudspeaker enclosure accommodates two loudspeakers (15, 17) secured to a partition (21). The partition divides the volume of the loudspeaker enclosure into two subvolumes (23, 25). The subvolumes communicate with one another via a tube (27) in order to reduce the electric power required to obtain the desired acoustic power of the sound emitted by the loudspeaker enclosure. One of the subvolumes (25) is acoustically coupled to a tube (33). One end (35) of the tube is situated near the end (7) of the exhaust pipe (3). The sound issuing from the loudspeaker enclosure via the tube interferes with the exhaust-gas sound. A Helmholtz resonator (41) is acoustically coupled to the tube (33) in order to suppress undesired resonances in the tube (33). The Helmholtz resonator contains such an amount of an acoustic damping material (43) in the form of glass wool or rock wool that the quality factor QHelmh. of the Helmholtz resonator lies between the values 1 and 3. <IMAGE></p> |
申请公布号 |
EP0589516(A2) |
申请公布日期 |
1994.03.30 |
申请号 |
EP19930202669 |
申请日期 |
1993.09.15 |
申请人 |
PHILIPS ELECTRONICS N.V. |
发明人 |
NIEUWENDIJK, JORIS ADELBERT MARIA;BAX, JOHANNES WILHELMUS THEODORUS;DE WACHTER, ANDRE JOZEF |
分类号 |
G10K11/172;F01N1/06;(IPC1-7):G10K11/16 |
主分类号 |
G10K11/172 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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