2 edition of Flight flutter testing with emphasis on the tip vane method found in the catalog.
Flight flutter testing with emphasis on the tip vane method
Presented at the 61st symposium of the Flight Mechanics Panel of Agard, Cesme, Turkey, 11-14th October, 1982.
|Statement||by Helmut Zimmermann and Roger Destuynder.|
|Contributions||Destuynder, Roger., Agard Flight Mechanics Panel Symposium on Ground/Flight Test Techniques and Correlation (1982 : Cesme, Turkey)|
The main goal is to evaluate the BTLS estimator and the tracking approach to monitor the time-varying dynamical behaviour of a system, in this case an aircraft, for which the poles have a typical evolution in time as shown in Fig. main motivation for considering a continuous change of aircraft dynamics originates from new research ideas on flight flutter testing, where aircraft Cited by: Flight Testing of Homebuilt Aircraft. The purpose of the flight was to conduct flutter testing of the prototype RV-4 to ten percent beyond Vne. It was necessary to overspeed the fixed pitch wood propeller somewhat to achieve the high air speed required for the test. Slight differences in wing construction, a different method of coupling.
The test program plan included a series of high-speed taxis down the runway leading to "land backs" or very short flights of just a few seconds as suggested by Vaughan Askue in "Flight Testing Homebuilt Aircraft" (Askue, ). The EAA Flight Advisor strongly disagreed with these procedures and suggested simply a few high-speed taxis, including. (b) post-flight data analysis, including signal process ing, stability estimation, and system identification; (c) new flutter prediction methods, incorporating non-linear issues in order to reduce the flutter test matrix . The flutter margin concept  has been used as a valuable tool to predict the flight flutter .
was in Boeing's telemetry room on Friday during the final flutter-test flight as teams of engineers diligently worked with test pilots Mike Carriker and Regis Hancock aboard ZA Flight testing is a branch of aeronautical engineering that develops and gathers data during flight of an aircraft, or atmospheric testing of launch vehicles and reusable spacecraft, and then analyzes the data to evaluate the aerodynamic flight characteristics of the vehicle in order to validate the design, including safety aspects.. The flight test phase accomplishes two major tasks: 1.
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DEVELOPMENT OF FLIGHT FLUTTER TEST TECHNIQUES Von Schlippe conducted the ﬁrst formal ﬂight ﬂutter test in Germany in The objective of his test method was to lessen the risk associated with ﬂutter testing.
The usual practice at this time was to ﬂy the airplane to the maximum speed and then to observe the stability of the Size: KB. Flight testing piloted and unmanned aerospace vehicles is an interdisciplinary process fundamental to the development of new systems and to the advancement of aeronautical knowledge.
Engineers from all branches of the engineering sciences are needed to successfully put a new system through a thorough and complete flight test by: Output-Only Subspace-Based Structural Identification: From R.,“Flight Flutter Testing with Emphasis on the Tip Vane Method,” Proceedings, AGARD Conf.
on Ground Flight Testing & Correlation. Schippers, P., and Persoon, A. J.,“Flight Flutter Testing of a Turbo Prop Aircraft by using External Excitation Devices Cited by: Various techniques are used for the excitation of aircraft during flutter flight test.
Each technique has its own merits and demerits depending upon the type and application of exciters. In this paper, a stochastic subspace method referred to as the Canonical Variate Analysis (CVA) is briefly discussed and subsequently applied to flight flutter test data. demonstrating and validating flutter prediction methods during flight .
The first aerostructures test wing [ATW1], flown inwas originally developed to directly address requests for better flight flutter test techniques by providing a functional flight test platform. While the first series of tests was. Most common flight flutter prediction methods are reviewed.
Finally, key considerations for successful flight flutter testing are noted by referencing the related literature. Findings – Online, real time monitoring of flutter stability during flight testing is very crucial, if the flutter Author: Altan Kayran.
being developed in the United Kilngdon for flight vibration testing and flight flutter testing aircraft. This includes a description of the instnznentation used for recotiing the Vibratioml response, and a comparative assessment of the vaious methods used for exciting the aircraft in i'lipht flutter Size: 2MB.
This is the Intrcductory Volume to the Flight Test Techniques Series. It is a general introduction to the various activities and aspects of Plighf Test Engineering that mut k considered when planning.
conducting, and reponmg a flight test program. Its main intent is to provide a broad ovewiew to tbc novice eogineer or to other people who baveFile Size: 1MB. B-2 Flight Test +29 - Originally from /r/MilitaryGfys Here is the original video. F Raptor Crash Landing during a Test Flight in Action at USAF Edwards Air Force Base California +14 - F22 flight test failure is pretty similar.
Aerodynamic Flutter +2 - Here's a video explaining this from everyone's favorite instructor. Unsteady aerodynamics: retrospect and prospect - Volume Issue - D.
Mabey H. and Destuynder, R. Flight flutter testing with emphasis on the tip vane method, AGARD CPPa ANON. Special course on aerodynamic characteristics of controls, AGARDANON.
Flight in an adverse environment, AGARD LS Cited by: 9. A detailed description is given of an eleotrodycamic method of exciting servo-tabs for flight flutter testing. Tests made to develop and establish the feasibility of the technique on a large aircraft with pure servo-tab controls are described.
Some specimen flight records are shown. The core of early work by the company was building aircraft models for wind tunnel testing at Langley Research Center. Dynamic Engineering Inc.'s Flutter Exciter mounts at the wing tips and tail tips of an aircraft to damp out structural vibrations.
During his year employment at Langley, Wilmer Reed gained international recognition for his innovative research, contributions and patented ideas relating to flutter.
aircraft, both of which experienced vertical fin flutter. DEVELOPMENT OF FLIGHT FLUTTER TEST TECHNIQUES Von Schlippe conducted the first formal flight flutter test in Germany in The objective of his test method was to lessen the risk associated with flutter testing.
The usual practice at this time was to fly the airplane to theFile Size: 1MB. Flight ﬂutter testing continues to be a challenging research area because of the concerns with cost, time, and safety in expanding the envelope of new or modiﬁed aircraft.
Testing is often done at stabilized test points to generate numerous data sets while attempting to estimate aeroelastic stability in an accurate and efﬁcient manner.
This chapter presents a survey of flight flutter testing techniques. There is a requirement for flight flutter testing to satisfy the need for positive proof of the acceptability of a prototype aircraft and specifically to cope with vibration or flutter difficulties encountered during the development stage of Author: A.J.
Marx. Lecture by NASA Langley Research Center's Wilmer Reed to a class at Old Dominion University. Lecture dates to Bill worked in the Transonic Dynamics Tunnel at. Flutter is an oscillation caused by interaction of aerodynamic forces, structural elasticity and inertial effects.
Perhaps the best known example of flutter is the bridge over the Tacoma Narrows ('Gallopin' Gertie') that collapsed due to flutter in gale force winds. Flutter in aircraft causes the wings and / or stabilizers to oscillate.
7-A. The airplane flutter requirement specified that “no surface shall show any signs of flutter or appreciable vibration in any attitude or condition of flight.” InBulletin No.
7-A was revised in view of service experience and contained advice and good practice techniques for the early airplane designer regarding flutter preventionFile Size: KB. analysis/criteria and flight flutter test. (1) The results of any of the rational analysis procedures required by § (c), could be used to provide guidance for formulating a flight flutter test plan.
The rigidity and mass balance criteria specified in § (d) may be used in lieu of a rational analysis for. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): This paper reviews the test techniques developed over the last several decades for flight flutter testing of aircraft.
Structural excitation systems, instrumentation systems, digital data preprocessing, and parameter identification algorithms (for frequency and damping estimates from the response data) are described.thrust flight velocity total power output exit velocity Propulsive efficiency The propulsive efficiency is defined as the ratio of the useful power output (the product of thrust and flight velocity, V0) to the total power output (rate of change of the kinetic energy of gases through the engine).
This simplifies to 0 0 2 propulsive 1 out e FV File Size: 1MB.critical aircraft flight flutter testing methods are presentcd and evaluation of the applicability of these methods to the testing of the space shuttle are discussed. Ten U.S. aircraft programs covering the large civil transport aircraft and a variety of military aircraft are reviewed.