Patent ID: 11905850
Assignee: MTU AERO ENGINES AG
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. An arrangement for reducing oscillation of an oscillatory structure, the arrangement comprising:
a structure having at least one mode in at least one direction; and
at least one oscillation-reducing device comprising at least one housing formed by or provided on the structure, a cavity, and at least one body configured for making impact contacts with the housing and disposed in the cavity in such a manner that the body is configured to make impact contacts with the housing at least temporarily for as long as the structure is excited in the at least one mode in the at least one direction, wherein:
a) for a clearance for movement B of the at least one body in the at least one direction in the cavity, it holds that:

0.1×A0j<B<0.95×A0j,

and/or
b) for a mass mi of the at least one body, it holds that:, m
    i
   
   <
   
    μ
    ×
    
     M
     
      j
      ⁢
      j
     
    
   
  
  ,
  
   
    with
    ⁢
    
      
       
    
    ⁢
    μ
   
   =
   
    a
    
     
      (
      
       
        A
        ⁢
        1
        ⁢
        j
       
       
        A
        ⁢
        0
        ⁢
        j
       
      
      )
     
     2
    
   
  
  ,
 

 and 0.000001<a<0.0009,
where A0j is an oscillation amplitude in the at least one mode without an oscillation-reducing device at a position at which the oscillation-reducing device is to be provided, during normal intended use of the structure,
where Mjj is a modal mass of the structure in the at least one mode, and
where A1j is a maximum oscillation amplitude in the at least one mode during the normal intended use of the structure with the oscillation-reducing device at the position at which the oscillation-reducing device is to be provided.