SE8603347L - Noise reduction by airplane propellers - Google Patents

Noise reduction by airplane propellers

Info

Publication number
SE8603347L
SE8603347L SE8603347A SE8603347A SE8603347L SE 8603347 L SE8603347 L SE 8603347L SE 8603347 A SE8603347 A SE 8603347A SE 8603347 A SE8603347 A SE 8603347A SE 8603347 L SE8603347 L SE 8603347L
Authority
SE
Sweden
Prior art keywords
noise reduction
blades
propellers
airplane propellers
propeller
Prior art date
Application number
SE8603347A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE465870B (en
SE8603347D0 (en
Inventor
A P Adamson
Original Assignee
Gen Electric
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
Application filed by Gen Electric filed Critical Gen Electric
Publication of SE8603347D0 publication Critical patent/SE8603347D0/en
Publication of SE8603347L publication Critical patent/SE8603347L/en
Publication of SE465870B publication Critical patent/SE465870B/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C11/00—Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Wind Motors (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Toys (AREA)
  • Exhaust Silencers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

In order to reduce the noise produced by counterrotating aircraft propellers, each propeller can be provided with a different number of blades (the numbers of blades being in the range 3, 5, 7, 8, 11, 13, 15 and 17). Mathematical relationships relating to the number of blades each propeller has and the respective speeds of rotation of the propellers, are discussed in detail in the context of noise production. <IMAGE>
SE8603347A 1985-08-09 1986-08-07 PROPELLER DEVICE AND WAY TO DRIVE THIS BEFORE NOISE REDUCTION SE465870B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US76414485A 1985-08-09 1985-08-09

Publications (3)

Publication Number Publication Date
SE8603347D0 SE8603347D0 (en) 1986-08-07
SE8603347L true SE8603347L (en) 1987-02-10
SE465870B SE465870B (en) 1991-11-11

Family

ID=25069809

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8603347A SE465870B (en) 1985-08-09 1986-08-07 PROPELLER DEVICE AND WAY TO DRIVE THIS BEFORE NOISE REDUCTION

Country Status (7)

Country Link
JP (1) JPS6271800A (en)
CN (1) CN1010205B (en)
DE (1) DE3626192A1 (en)
FR (1) FR2586130B1 (en)
GB (1) GB2179706B (en)
IT (1) IT1198021B (en)
SE (1) SE465870B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913376A (en) * 1988-10-21 1990-04-03 Black Franklin E VTLH autogyro
US5169288A (en) * 1991-09-06 1992-12-08 General Electric Company Low noise fan assembly
DE60315959T2 (en) * 2002-03-15 2008-05-21 Robert Bosch Llc ENGINE COOLED FAN ASSEMBLY WITH OVERLAPPING WINGS
GB0702608D0 (en) 2007-02-10 2007-03-21 Rolls Royce Plc Aeroengine
GB2482333A (en) * 2010-07-30 2012-02-01 Ge Aviat Systems Ltd Aircraft propeller
US10522166B2 (en) * 2015-01-20 2019-12-31 Dolby Laboratories Licensing Corporation Modeling and reduction of drone propulsion system noise
CN108602554B (en) * 2015-12-18 2022-01-07 亚马逊科技公司 Method of operating an aircraft having a first set of propellers and a second set of propellers

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB492489A (en) * 1937-11-25 1938-09-21 Hermann Honnef Improvements in and relating to wind-operated power generators
GB521868A (en) * 1938-11-29 1940-06-03 Napier & Son Ltd Improvements in or relating to propelling or impelling apparatus of the axial flow type
FR2367660A1 (en) * 1976-10-14 1978-05-12 Gueguen Alain Gilbert Silencing of multi-engined jet aircraft - has sound waves from two engines arranged to be exactly out of phase with each other
SE433599B (en) * 1981-03-05 1984-06-04 Volvo Penta Ab DOUBLE PROPELLER DRIVE FOR BATAR
DE3519226A1 (en) * 1985-05-30 1986-12-04 Boris Alekseevi&ccaron; Stupino Moskovskaja oblast' &Ccaron;esnokov AIRCRAFT ENGINE

Also Published As

Publication number Publication date
FR2586130A1 (en) 1987-02-13
SE465870B (en) 1991-11-11
FR2586130B1 (en) 1989-12-22
IT1198021B (en) 1988-12-21
SE8603347D0 (en) 1986-08-07
CN1010205B (en) 1990-10-31
JPS6271800A (en) 1987-04-02
CN86105565A (en) 1987-02-04
IT8621463A1 (en) 1988-02-08
GB2179706B (en) 1990-04-18
GB2179706A (en) 1987-03-11
DE3626192A1 (en) 1987-02-19
GB8613547D0 (en) 1986-07-09
IT8621463A0 (en) 1986-08-08

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