All prospective approaches to the reduction of helicopter vibrations were searched to establish insight for the planning of a corrective research program. The state of the art as revealed in the literature is summed up and followed by a discussion of state-of-the-art solutions and of identified technological gaps. It is applicable to all helicopters without regard to size. Extending the historic trend toward lower vibration levels will require the successful application of principles which isolate the fuselage from the rotor systems. Simplicity of the necessary isolation systems should be facilitated by providing other refinements of the dynamic design of the system
An expanded commercial use of rotorcraft can alleviate runway congestion and improve the accessibili...
An investigation of two selected helicopter types, namely, the Models 206A/B and 212, is reported. A...
The development and validation of an optimization procedure to systematically place tuning masses al...
Results of analytical investigations to develop, understand, and evaluate potential helicopter vibra...
The requirement for low vibrations has achieved the status of a critical design consideration in mod...
A NASA/industry rotorcraft structural dynamics program known as Design Analysis Methods for VIBratio...
Two electrohydraulic vibration isolation systems were designed and fabricated to reduce the vertical...
Helicopter airframe vibration is examined using calculations and measurements for the SA349/2 resear...
Harmonic rotor hub loads and airframe interactions in steady flight are reviewed, with regard to the...
The results of a joint NASA/Army/Bell Helicopter Textron wind-tunnel test to assess the potential of...
The importance of blade design parameters in rotor vibratory response and the design of a minimum vi...
Higher harmonic blade feathering for helicopter vibration reduction is considered. Recent wind tunne...
Chapter one presents a discussion of flight-test and analysis methods for some selected helicopter v...
Issued as Status reports no. [1-2], and Final report, Project no. E-16-610Final report has title: He...
An an overview and discussion of those aspects of airframe structural dynamics that have a strong in...
An expanded commercial use of rotorcraft can alleviate runway congestion and improve the accessibili...
An investigation of two selected helicopter types, namely, the Models 206A/B and 212, is reported. A...
The development and validation of an optimization procedure to systematically place tuning masses al...
Results of analytical investigations to develop, understand, and evaluate potential helicopter vibra...
The requirement for low vibrations has achieved the status of a critical design consideration in mod...
A NASA/industry rotorcraft structural dynamics program known as Design Analysis Methods for VIBratio...
Two electrohydraulic vibration isolation systems were designed and fabricated to reduce the vertical...
Helicopter airframe vibration is examined using calculations and measurements for the SA349/2 resear...
Harmonic rotor hub loads and airframe interactions in steady flight are reviewed, with regard to the...
The results of a joint NASA/Army/Bell Helicopter Textron wind-tunnel test to assess the potential of...
The importance of blade design parameters in rotor vibratory response and the design of a minimum vi...
Higher harmonic blade feathering for helicopter vibration reduction is considered. Recent wind tunne...
Chapter one presents a discussion of flight-test and analysis methods for some selected helicopter v...
Issued as Status reports no. [1-2], and Final report, Project no. E-16-610Final report has title: He...
An an overview and discussion of those aspects of airframe structural dynamics that have a strong in...
An expanded commercial use of rotorcraft can alleviate runway congestion and improve the accessibili...
An investigation of two selected helicopter types, namely, the Models 206A/B and 212, is reported. A...
The development and validation of an optimization procedure to systematically place tuning masses al...