GB877532A - Improvements in sound attenuators for exhaust gases - Google Patents

Improvements in sound attenuators for exhaust gases

Info

Publication number
GB877532A
GB877532A GB2359460A GB2359460A GB877532A GB 877532 A GB877532 A GB 877532A GB 2359460 A GB2359460 A GB 2359460A GB 2359460 A GB2359460 A GB 2359460A GB 877532 A GB877532 A GB 877532A
Authority
GB
United Kingdom
Prior art keywords
rods
spacers
fret
vibrate
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2359460A
Inventor
Carl Walter Lemmerman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
C W LEMMERMAN Inc
Original Assignee
C W LEMMERMAN Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US746268A priority Critical patent/US2965190A/en
Application filed by C W LEMMERMAN Inc filed Critical C W LEMMERMAN Inc
Priority to GB2359460A priority patent/GB877532A/en
Publication of GB877532A publication Critical patent/GB877532A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/78—Other construction of jet pipes
    • F02K1/82—Jet pipe walls, e.g. liners
    • F02K1/827—Sound absorbing structures or liners

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

877,532. Exhaust-silencers. LEMMERMAN Inc., C. W. July 6, 1960, No. 23594/60. Class 7(2). [Also in Group XXVI] An aircraft gas turbine tail section acting as a silencer for exhaust gases comprises a housing 16, a plurality of axially extending elongate vibratory rods 22 fixed at each end to annular end rings 24, 26 and maintained under tension in a cylindrical array within and concentrically spaced inwardly of the housing, and a part-annular fret 34 mounted to engage a portion of the rods in a plane transverse to the housing axis, the fret being positioned transversely of the rods to divide them into axial portions isolated to vibrate independently. As shown, four spacers 28 are fixed between the two end-rings 24, 26, at equal circumferential intervals and an equal number of axially offset arcuate frets 34, 36, 46, 48 are attached to the spacers one fret being disposed between adjacent pairs of spacers. The frets are so positioned between the spacers that the fundamental frequency of one axial portion of the divided rods is a multiple of the fundamental frequency of the other portion. The rods are welded to a V-shaped inner ridge on members 24, 26 with the ends 30, 32 extending beyond the member 24, 26. These ends vibrate as clamped free bars at a very high frequency. The rods are preferably of stainless steel and of a diameter to vibrate at a frequency determined by the tension thereof. A diffuser (not shown) clamps to a flange 18.
GB2359460A 1958-07-02 1960-07-06 Improvements in sound attenuators for exhaust gases Expired GB877532A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US746268A US2965190A (en) 1958-07-02 1958-07-02 Jet engine muffler
GB2359460A GB877532A (en) 1960-07-06 1960-07-06 Improvements in sound attenuators for exhaust gases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2359460A GB877532A (en) 1960-07-06 1960-07-06 Improvements in sound attenuators for exhaust gases

Publications (1)

Publication Number Publication Date
GB877532A true GB877532A (en) 1961-09-13

Family

ID=10198207

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2359460A Expired GB877532A (en) 1958-07-02 1960-07-06 Improvements in sound attenuators for exhaust gases

Country Status (1)

Country Link
GB (1) GB877532A (en)

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