Half-model-balance for the Cologne-cryogenic-wind-tunnel development and test results

Hufnagel, Klaus; Rebstock, R.; Zhai, Junnai

doi:10.1109/iciasf.1999.827172

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Nevertheless, for principal optimization of strain gauge balance designs, finite element analysis proved to be an extremely valuable tool. This was demonstrated by the work of Dr Junnai Zhai at the Technical University of Darmstadt [22,26,27,29,31,36]. Work on balance optimization with finite element analysis is being continued at the Technical University of Darmstadt.…”

Section: Computation and Optimization Of The Balance Designmentioning

confidence: 99%

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Multi-component force balances for conventional and cryogenic wind tunnels

Ewald

2000

Meas. Sci. Technol.

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The measurement of the total forces acting on the surface of a wind tunnel model is still the most important wind tunnel measurement technology. Either the model is mounted by struts to a balance, which is located outside the test section (an `external balance'), or the balance is located inside the model and connects the model structure to the mounting sting, which in the case of aeroplane configurations protrudes from the rear fuselage (an `internal balance'). This review concerns internal balances only. The functional principle is described and some comments on the demand for high accuracy are given. The optimization of designs for strain gauge balances, the fabrication methods and the selection of materials are commented on. The calibration theory of multi-component balances is outlined and the calibration equipment is described. Examples for conventional manual calibration equipment and for an automatic calibration machine are given. Finally the specific design features of cryogenic balances and half model balances are given. This review presents the author's experiences and developments. Since there is hardly any general literature on the subject of strain gauge balances and since the balance engineers in the world have not that much contact with each other, there may be different points of view at other institutions.

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Section: Computation and Optimization Of The Balance Designmentioning

confidence: 99%

“…The details of this design are still a matter of a patent pending. For more details on half model balances see [21,29,31,33].…”

Section: Half Model Balance Technologymentioning

confidence: 99%

Multi-component force balances for conventional and cryogenic wind tunnels

Ewald

2000

Meas. Sci. Technol.

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Development of the NTF-117S Semi-span Balance (Invited)

Lynn

2010

27th AIAA Aerodynamic Measurement Technology and Ground Testing Conference

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High-Reynolds Number Active Blowing Semi-Span Force Measurement System Development

Lynn

Rhew

Acheson

et al. 2012

28th Aerodynamic Measurement Technology, Ground Testing, and Flight Testing Conference

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Recent wind-tunnel tests at the NASA Langley Research Center National Transonic Facility utilized high-pressure bellows to route air to the model for evaluating aircraft circulation control. The introduction of these bellows within the Sidewall Model Support System significantly impacted the performance of the external sidewall mounted semi-span balance. As a result of this impact on the semi-span balance measurement performance, it became apparent that a new capability needed to be built into the National Transonic Facility's infrastructure to allow for performing pressure tare calibrations on the balance in order to properly characterize its performance under the influence of static bellows pressure tare loads and bellows thermal effects. The objective of this study was to design both mechanical calibration hardware and an experimental calibration design that can be employed at the facility in order to efficiently and precisely perform the necessary loadings in order to characterize the semi-span balance under the influence of multiple calibration factors (balance forces/moments and bellows pressure/temperature). Using statistical design of experiments, an experimental design was developed allowing for strategically characterizing the behavior of the semi-span balance for use in circulation control and propulsion-type flow control testing at the National Transonic Facility.

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Half-model-balance for the Cologne-cryogenic-wind-tunnel development and test results

Cited by 3 publications

References 3 publications

Multi-component force balances for conventional and cryogenic wind tunnels

Multi-component force balances for conventional and cryogenic wind tunnels

Development of the NTF-117S Semi-span Balance (Invited)

High-Reynolds Number Active Blowing Semi-Span Force Measurement System Development

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