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公开(公告)号：JPH1172138A
公开(公告)日：1999-03-16
申请号：JP10782598
申请日：1998-04-17
Applicant: APPLIED POWER INC
Inventor： VON FLOTOW ANDREAS H , MERCADAL MATHIEU , SCRIBNER KELVIN B , MIXON TIMOTHY , ROESELER CORYDON
Abstract: PROBLEM TO BE SOLVED: To absorb energy of time cycle vibration of a structural member by hanging a mass body from a mount base between rods to constitute a flexible body type spring assembly and changing the stiffness of a spring by a tuning mechanism by the adjustment of tensile force in the rods and compression. SOLUTION: A durable mass body 32 is positioned in a cavity 34 in an external housing 31 and is arranged at a fixed interval from a closed end part of the housing by a first flexible body assembly 36. The first flexible body assembly 36 has a rod 40 and circular rings 37, 38 which are parallel each other. A second flexible body 55 is formed by a flexible rod 59 having a circular cross section and circular rings 57 and 58 which are in parallel. By changing the compression force which acts on the rods 40 and 59 of the flexible body assembly, the stiffness of a spring is changed to change resonance frequency and maintain the optimum adjustment of a vibration absorber. Consequently, it is possible to absorb vibration energy due to the vibration of the durable mass body 32 in the optimum condition.
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公开(公告)号：CA2233495C
公开(公告)日：2006-10-03
申请号：CA2233495
申请日：1998-03-27
Applicant: APPLIED POWER INC
Inventor： VON FLOTOW ANDREAS H , ROESELER CORYDON , MERCADAL MATHIEU , MIXON TIMOTHY , SCRIBNER KELVIN B
Abstract: An aircraft engine is attached to the fuselage by a mounting structure that has a vibration absorbing system which includes first and second sensors to produce signals indicating vibration along two orthogonal axes. A third sensor, such as an accelerometer, is coupled to the mounting structure for sensing vibration of the engine. A tachometer circuit, connected to the third sensor, produces first and second speed signals that indicate the speeds of two rotating spools in the engine. Four vibration absorbers are attached to the engine mounting structure and controllers are provided to dynamically tune the resonant frequency of each vibration absorber in response to a unique combination of one of the two vibration signals and one of the two speed signals. Thus the vibration absorbers reduce the engine spool vibrations that are transmitted through the mounting structure along the two orthogonal axes. The resonant frequency of each absorber is altered to track variation of the vibrations due to changes in engine speed.
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公开(公告)号：CA2233495A1
公开(公告)日：1998-10-17
申请号：CA2233495
申请日：1998-03-27
Applicant: APPLIED POWER INC
Inventor： MIXON TIMOTHY , VON FLOTOW ANDREAS H , ROESELER CORYDON , MERCADAL MATHIEU , SCRIBNER KELVIN B
Abstract: An aircraft engine is attached to the fuselage by a mounting structure that has a vibration absorbing system which includes first and second sensors to produce signals indicating vibration along two orthogonal axes. A third sensor, such as an accelerometer, is coupled to the mounting structure for sensing vibration of the engine. A tachometer circuit, connected to the third sensor, produces first and second speed signals that indicate the speeds of two rotating spools in the engine. Four vibration absorbers are attached to the engine mounting structure and controllers are provided to dynamically tune the resonant frequency of each vibration absorber in response to a unique combination of one of the two vibration signals and one of the two speed signals. Thus the vibration absorbers reduce the engine spool vibrations that are transmitted through the mounting structure along the two orthogonal axes The resonant frequency of each absorber is altered to track variation of the vibrations due to changes in engine speed.
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公开(公告)号：DE69821818D1
公开(公告)日：2004-04-01
申请号：DE69821818
申请日：1998-04-16
Applicant: APPLIED POWER INC
Inventor： VON FLOTOW ANDREAS H , MIXON TIMOTHY , MERCADAL MATHIEU , ROESELER CORYDON , SCRIBNER KELVIN B
Abstract: An aircraft engine is attached to the fuselage by a mounting structure (20) that has a vibration absorbing system which includes first and second sensors (61,62), to produce signals indicating vibration along two orthogonal axes. A third sensor, such as an accelerometer (64), is coupled to the mounting structure for sensing vibration of the engine. A tachometer circuit (67), connected to the third sensor, produces first and second speed signals that indicate the speeds of two rotating spools (N1,N2) in the engine. Four vibration absorbers (26-29) are attached to the engine mounting structure and controllers (60) are provided to dynamically tune the resonant frequency of each vibration absorber in response to a unique combination of one of the two vibration signals and one of the two speed signals. Thus the vibration absorbers reduce the engine spool vibrations that are transmitted through the mounting structure along the two orthogonal axes. The resonant frequency of each absorber is altered to track variation of the vibrations due to changes in engine speed.
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