Free flight measurement technique in shock tunnel

Martinez, Bastien; Bastide, Myriam; Wey, Pierre

doi:10.2514/6.2014-2523

Cited by 21 publications

(3 citation statements)

References 9 publications

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“…The higher the natural frequencies are, the better the justification for the neglected acceleration compensation. For these test conditions, many researchers have proposed several special balances to measure the aerodynamic forces in impulse facilities-i.e., the accelerometer balance [5][6][7], the stress-wave force balance [8][9][10], the free-flight measurement technique [11][12][13][14][15], the compensated balance [16], and the impulse-type strain gauge balance (SGB) [17,18]. Owing to the very short test time, however, mature technology has not been developed for the force measurement in a shock tunnel.…”

Section: Introductionmentioning

confidence: 99%

Intelligent Force-Measurement System Use in Shock Tunnel

Wang

Jiang

2020

Sensors

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The inertial vibration of the force measurement system (FMS) has a large influence on the force measuring result of aircraft, especially on some tests carried out in high-enthalpy impulse facilities, such as in a shock tunnel. When force tests are conducted in a shock tunnel, the low-frequency vibrations of the FMS and its motion cannot be addressed through digital filtering because of the inertial forces, which are caused by the impact flow during the starting process of the shock tunnel. Therefore, this paper focuses on the dynamic characteristics of the performance of the FMS. A new method—i.e., deep-learning-based single-vector dynamic self-calibration (DL-based SV-DSC) of an impulse FMS, is proposed to increase the accuracy of aerodynamic force measurements in a shock tunnel. A deep-learning technique is used to train the dynamic model of the FMS in this study. Convolutional neural networks with a simple structure are applied to describe the dynamic modeling so that the low-frequency vibration signals are eliminated from the test results of the shock tunnel. By validation of the force test results measured in a shock tunnel, the current trained model can realize intelligent processing of the balance signals of the FMS. Based on this new method of dynamic calibration, the reliability and accuracy of force data processing are well verified.

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Section: Introductionmentioning

confidence: 99%

Intelligent Force-Measurement System Use in Shock Tunnel

Wang

Jiang

2020

Sensors

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“…Since only two markers were used, the six pose parameters of the target could not be detected by the proposed system. In 2014, Martinez et al [6] proposed a pose measurement scheme for a fast flying target in a Mach 4.5 shock tunnel. This method measured the pose parameters by tracking the marker points in the image sequence obtained by a high-speed camera.…”

Section: Introductionmentioning

confidence: 99%

A Novel Vision-Based Pose Measurement Method Considering the Refraction of Light

Liu

Xiao

et al. 2018

Sensors

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Nowadays, due to the advantages of non-contact and high-speed, vision-based pose measurements have been widely used for aircraft performance testing in a wind tunnel. However, usually glass ports are used to protect cameras against the high-speed airflow influence, which will lead to a big measurement error. In this paper, to further improve the vision-based pose measurement accuracy, an imaging model which considers the refraction light of the observation window was proposed. In this method, a nonlinear camera calibration model considering the refraction brought by the wind tunnel observation window, was established first. What’s more, a new method for the linear calibration of the normal vector of the glass observation window was presented. Then, combining with the proposed matching method based on coplanarity constraint, the six pose parameters of the falling target could be calculated. Finally, the experimental setup was established to conduct the pose measurement study in the laboratory, and the results satisfied the application requirements. Besides, experiments for verifying the vision measurement accuracy were also performed, and the results indicated that the displacement and angle measurement accuracy approximately increased by 57% and 33.6%, respectively, which showed the high accuracy of the proposed method.

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“…At the same facility using a different ballistic model, Martinez et al (2014) installed markers on a free flying model and tracked the motion of those during the test time. Two experimental setups were used, both employing a single camera.…”

Section: Free Flight Force Measurement Techniquementioning

confidence: 99%

Design of a 3D shape transitioning nozzle and experimental thrust measurements of an airframe integrated scramjet

Kunze¹

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Free flight measurement technique in shock tunnel

Cited by 21 publications

References 9 publications

Intelligent Force-Measurement System Use in Shock Tunnel

Intelligent Force-Measurement System Use in Shock Tunnel

A Novel Vision-Based Pose Measurement Method Considering the Refraction of Light

Design of a 3D shape transitioning nozzle and experimental thrust measurements of an airframe integrated scramjet

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