UniCopter ~ Vibration - Rotor Induced - Analysis

Overview:

An attempt to try to;
    1. Determine the potential sources of vibrations in the UniCopter.
    2. Then elaborate on these sources and the potential elimination, on B311.

 

1. Potential Sources of Vibration:

ID

Hover:

Transition: μ ≈ 0.1?

High Speed

 

Dissymmetry of lift (and drag?).

19/

No

No

Yes

 

Rotor to Rotor (downwash & downdraft)

17/

Yes

Yes

Yes

 

Blade to Blade (BVI) (within same rotor)

12/

Maybe

Yes

No

 

Rotor to Rotor (BVI) (between blades of different rotors)

18/

Maybe

Maybe

Maybe

 

Downwash on the Fuselage.

1/

No

No

Yes

 

Downwash on the Tail Boom.

2/

Yes

Yes

Yes

 

Gusts.

14/

Yes

Yes

Yes

 

Moments about the blades' feathering axes.

15 & 16/

Yes

Yes

Yes

A primary index of ID's above can be found on pages; 1020.html & 1089.html

 Working Papers:

 

DESIGN:

B311

MAKE:

 

BUY:

 

Items:

DESIGN:

 

 

Name

Item

 

 

General:

 

 

 

 

 

 

 

Source - Individual Rotor: (aerodynamic vibrations on an independent rotor.)

 

 

 

UniCopter ~ Vibration - Rotor Induced - Analysis - Blades to Hubs

1080

 

 

UniCopter ~ Rotor - Disk - Single - Downwash in Hover

0887

 

17/

Source - Rotor to Rotor: (vibrations inflicted on one rotor by the other.)

 

 

 

UniCopter ~ Rotor - Disk - Aerodynamic Interaction between Intermeshing Disks

 

 

 

UniCopter ~ Rotor - Disk - Clearance - 3 Blades RRR

0854

 

 

UniCopter ~ Rotor - Disk - Downwash Intersection Azimuths

1029

 

19/

Source - Lateral Dissymmetry of Lift (and Drag?): (vibrations from uneven thrust.)

 

 

 

UniCopter ~ Rotor - Disk - Lateral Dissymmetry of Lift

0871

 

1/ & 2/

Source - Fuselage: (downwash on fuselage and tail boom)

 

 

 

UniCopter ~ Vibration - Rotor Induced - Analysis - Downwash on Fuselage

1074

 

15 & 16/

Source - Cyclic Stick from Individual Rotor via Pitch Links:

 

 

 

 

 

OTHER:

 

 

Name

Item

 

 

OTHER: Aerodynamics - Vibration - Rotor Induced

B365

 

 

~ or ~

 

 

 

OTHER: Aerodynamics - Vibration - Rotor Induced - Overview

1059

 

 

OTHER: Aerodynamics - Vibration - Rotor Induced - Source- Single Rotor

1020

 

 

OTHER: Aerodynamics - Vibration - Rotor Induced - Source - Twin Rotor

1089

 

12 & 18/

OTHER: Aerodynamics - Vibration - Rotor Induced - Blade Vortex Interaction [BVI]

1094

 

 

OTHER: Aerodynamics - Vibration - Rotor Induced - Re: Coaxial (Sikorsky ABC & Kamov)

0893

 

 

OTHER: Aerodynamics - Vibration - Rotor Induced - Re: Flettner FL-282

1086

 

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Last Revised: April 7, 2004