FPGA-based embedded system for wind tunnel variable-geometry nozzle positioning

Ilić, Biljana; Milosavljević, Mirko

doi:10.5937/str1901003i

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Mach number range of the facility is 0.2 to 4.0. Mach number in the subsonic and supersonic speed ranges is set prior to a wind tunnel run, by setting the second throat and the variable-geometry nozzle contour [45], respectively. Additionally, in the transonic speed regime, an active blow-off system performs a fine regulation of the Mach number to within 0.3% of the nominal value.…”

Section: The Vti T-38 Wind Tunnelmentioning

confidence: 99%

Wind Tunnel Testing of ONERA-M, AGARD-B and HB-2 Standard Models at Off-Design Conditions

et al. 2021

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Published results for standard wind tunnel models at non-standard test conditions are quite rare and/or may not be available. It has been found that those results are a useful aid in preparations for a number of wind tunnel tests in the Military Technical Institute (VTI) in Belgrade. Test campaigns of standard models at non-standard conditions are performed to serve as an internal database for future wind tunnel tests in such environments. Those tests, that partially overlap the referenced Mach number and/or angle of attack ranges, are conducted in different VTI’s test facilities; different model sizes and support stings were used. The standard models used in static measurements in VTI, ranging from simple missile shapes and re-entry bodies to complicated airplanes, are briefly described and sample non-standard test results are given. The correlation of the test results among models and facilities has been done with references in the available ranges, and, after confirming a good agreement, it is assumed that the results are also valid in the extended ranges of conditions. These results may be useful for researchers in other wind tunnel facilities and for those who handle CFD tools.

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Section: The Vti T-38 Wind Tunnelmentioning

confidence: 99%

Wind Tunnel Testing of ONERA-M, AGARD-B and HB-2 Standard Models at Off-Design Conditions

et al. 2021

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“…In some supersonic wind tunnels, dedicated protective structures were designed to limit the maximum curvature of the FFN plates for safety operation [8,9]. However, extra structures bring difficulties to the manufacturing, assembling, as well as maintenance.…”

Section: Introductionmentioning

confidence: 99%

A Highly Accurate Method for Deformation Reconstruction of Smart Deformable Structures Based on Flexible Strain Sensors

Gao

Liao

et al. 2022

Micromachines

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Smart deformable structures that integrate designing, sensing, and controlling technology have been widely applied in the fields of aerospace, robotics, and biomedical engineering due to their multi-functional requirements. The deformation reconstruction method essential for security monitoring and shape controlling, especially for the large deflection deformation, remains a challenge on accuracy and efficiency. This paper takes a wind tunnel’s fixed-flexible nozzle (FFN) plate as the research object to develop a highly accurate deformation reconstruction method based on sensing information from flexible strain sensors. The mechanical behaviors of the FFN plate with large deflection deformation, which is modeled as a cantilever beam, are studied to analyze the relationship of the strain and moment. Furthermore, the large deflection factor and shell bending theory are creatively utilized to derive and modify the strain–moment based reconstruction method (SMRM), where the contour of the FFN plate is solved by particular elliptic integrals. As a result, structural simulation based on ABAQUS further demonstrates that the reconstruction error of SMRM is 21.13% less than that of the classic Ko-based reconstruction method (KORM). An FFN prototype accompanied by customized flexible sensors is developed to evaluate the accuracy and efficiency of the SMRM, resulting in a maximum relative error of 3.97% that is acceptable for practical applications in smart deformable structures, not limited to the FFN plate.

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“…The forced oscillation apparatus for measurement of pitch and yaw damping derivatives in the T-38 wind tunnel of the Military Technical Institute (VTI) is a full-model forced oscillation apparatus with the primary angular oscillation around the transversal axis (pitch or yaw) of a model [8]. A wind tunnel model is mounted on the front part of the apparatus, Fig.3.…”

Section: Introductionmentioning

confidence: 99%

An elastic element with a pair of symmetrical cross-flexures

Samardžić¹,

Ćurčić²,

Marinkovski³

2019

Sci Tech Rev

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Elastic element of the forced oscillation apparatus for dynamic measurements in the T-38 wind tunnel is described. The elastic element supports large aerodynamic load and enables oscillatory motion of a model during dynamic wind tunnel experiments. Design of the elastic element is a very complex process due to the restricted available space within the model. The elastic element of the T-38 oscillation apparatus is formed from a pair of symmetrical cross-flexures. Two types of the cross-flexures are presented: cross-flexure with uniform cross-section of the strips and cross-flexure with variable cross-section of the strips. Stress analysis of the cross-flexures showed that strips with variable cross-section much better matched strict requirements of the dynamic wind tunnel experiments.

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FPGA-based embedded system for wind tunnel variable-geometry nozzle positioning

Cited by 5 publications

References 13 publications

Wind Tunnel Testing of ONERA-M, AGARD-B and HB-2 Standard Models at Off-Design Conditions

Wind Tunnel Testing of ONERA-M, AGARD-B and HB-2 Standard Models at Off-Design Conditions

A Highly Accurate Method for Deformation Reconstruction of Smart Deformable Structures Based on Flexible Strain Sensors

An elastic element with a pair of symmetrical cross-flexures

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