Stochastic fatigue analysis of an F-16 forward engine mount support fitting

Fatigue analysis, to determine the lifetime of a component or complete aircraft structure, normally is based on deterministic models, in which the parameters are constants. In order to compensate for neglecting the natural variability of the parameters and other uncertainties a safety factor is applied. Another way of dealing with the...

Review of aeronautical fatigue investigation in the Netherlands during the period March 1999 March 2001

A review is presented of the work on aeronautical fatigue that is performed in the Netherlands in the period March 1999 till March 2001.

Failure and cracking of Inconel 718 air supply manifold support rods: A service-related contribution to lEPG TA 31

In 1995 an air supply manifold support rod from a high-performance turbofan engine failed by bending fatigue. The rod material was Inconel 718, operating at about 550° in an air environment. Diagnostic aspects of the failure (fatigue in bending, Stage I and Stage II fatigue fracture characteristics, and interference colours due to fracture...

Overview of the FAA/DCA/NLR programs related to ageing aircraft

The present paper gives a brief review of current and planned research at NLR related to the problems associated with Ageing Aircraft. This research is primarily directed towards the prevention of Ageing Aircraft problems in future aircraft and is concentrated on two areas: - prevention of MSD in lap joints; - improved knowledge on operational...

Methoden voor het verbeteren van dynamische modellen van constructies

A survey of computational methods to improve dynamic analytical models described in the literature is made. Both the matrix methods and the optimal correction method of the dynamic model using the measured modes are discussed.

Description of a method to calculate the aeroelastic stability of two-bladed horizontal-axis wind turbine

A method to calculate the aeroelastic stability of a horizontal-axis wind turbine has been presented. Its description comprises the derivation of the equations of motion which include periodic coefficients, and the application of the Floquet transition matrix method to investigate the stability. The method is exemplified by an analysis of a 25 m...

Description of a method to calculate the aeroelastic stability of a vertical axis wind turbine

A method is presented to calculate the aeroelastic stability of a vertical axis wind turbine. A derivation is given of the equations of motion and the calculation method has been exemplified by sin analysis of a 5m diameter wind turbine.

Investigations on the aeroelastic stability of large wind turbines

The paper presents a discussion of the aeroelastic stability of wind turbines with vertical axis (VAWT) and with horizontal axis (HAWT). Results are given for an existing 5 m VAWT test-bed with and without tie-down system.

Some investigations on the notching procedtire used in shaker tests on satellites

The notching procedure as used in the shaker test on a satellite is critically examined. In stead of the notching procedure an alternative test set-up, in which the dynamic interaction between launcher and spacecraft is taken into account, has been proposed and investigated for a simple model of launcher and satellite. Using this test set-up the...

Evaluation of calculation and test methods for acoustic fatigue

Analytical methods for determination of acoustic response are evaluated. The applicability of the methods to actual aerospace structures is checked by calculating acoustic response of the Fokker F-28 stabilizer. The calculated results are compared with experimental data. A brief evaluation of test methods is made.

Calculation of vibration modes and resonance frequencies of the Northrop NF-5

The component mode technique is used to calculate resonance frequencies and vibration modes of the Northrop NF-5 structure. The results of the calculations are compared with those of a ground vibration test.

Berekening van het interactie model van Van der Neut met behulp van de eindige-elementenmethode