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Calculation of flight vibration levels of the ah-1g helicopter and correlation with existing flight vibration measurements (Document No: 19900016059)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Sopher, R. Twomey, W. J. |
| Copyright Year | 1990 |
| Description | NASA-Langley is sponsoring a rotorcraft structural dynamics program with the objective to establish in the U.S. a superior capability to utilize finite element analysis models for calculations to support industrial design of helicopter airframe structures. In the initial phase of the program, teams from the major U.S. manufacturers of helicopter airframes will apply extant finite element analysis methods to calculate loads and vibrations of helicopter airframes, and perform correlations between analysis and measurements. The aforementioned rotorcraft structural dynamics program was given the acronym DAMVIBS (Design Analysis Method for Vibrations). Sikorsky's RDYNE Rotorcraft Dynamics Analysis used for the correlation study, the specifics of the application of RDYNE to the AH-1G, and comparisons of the predictions of the method with flight data for loads and vibrations on the AH-1G are described. RDYNE was able to predict trends of variations of loads and vibrations with airspeed, but in some instances magnitudes differed from measured results by factors of two or three to one. Sensitivities were studied of predictions to rotor inflow modeling, effects of torsional modes, number of blade bending modes, fuselage structural damping, and hub modal content. |
| File Size | 3573657 |
| Page Count | 208 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900016059 |
| Archival Resource Key | ark:/13960/t9673c083 |
| Language | English |
| Publisher Date | 1990-04-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Dynamic Response Dynamic Structural Analysis Structural Vibration Rotors Vibration Measurement Ah-1g Helicopter Design Analysis Finite Element Method Airspeed Vibration Damping Airframes In-flight Monitoring Bending Fuselages Abbreviations Torsion Aircraft Structures Aerodynamic Loads Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
