Laser and vision-based measurements of helicopter blade angles

Zappa, Emanuele; Liu, Rui; Trainelli, L.; Ferrario, Andrea; Cordisco, P.; Terraneo, Mauro; Grassetti, Riccardo; Redaelli, Matteo

doi:10.1016/j.measurement.2017.12.037

Cited by 14 publications

(14 citation statements)

References 26 publications

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“…The most common is the optical method, using a set of two cameras [16] and markers need to be placed on blade surfaces. Blade deformation was also measured by means of a laser [17] or the Stereo-Cam system, which combines a camera system with laser measurement [18]. Measurement methods based on analysis of acoustic pressure changes at different locations in the blade profile were also used to study air vibrations on the rotor blade surface [19].…”

Section: Methodsmentioning

confidence: 99%

Durability Analysis of the Prototype Test Rig for Main Rotors

Ścisłowski¹,

Skiba²,

Wendeker³

et al. 2022

Komunikácie

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ResumeThis paper presents an analysis of the strength of a prototype test rig for testing rotors of unmanned aerial vehicles. Digital design software was used for the design work that covered the creation of a virtual model of the test rig and strength analysis of its key elements. The paper discusses the test rig solutions, applied to date, of the small main rotor research. From the assumed operational parameters and structural parameters of the rotor, the main forces acting on the designed structure were determined: lifting force, reaction torque and empty mass of the test rig. Suitable actuators of the control system enabling the regulation of the total pitch and periodic pitch of the rotor, within the full range of the angle of attack, were selected for the rotor under test. The FEM (Finite Element Method) strength analysis was carried out for the proposed support structure and the correctness of the design was verified.

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Section: Methodsmentioning

confidence: 99%

Durability Analysis of the Prototype Test Rig for Main Rotors

Ścisłowski¹,

Skiba²,

Wendeker³

et al. 2022

Komunikácie

View full text Add to dashboard Cite

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“…The working principle of the blade angles measuring system is based on tracking the features of an appropriate target integral to the blade root [31]. The kinematic model of the blade motion with respect to the hub is represented by…”

Section: Measurement Approachmentioning

confidence: 99%

“…( 1) is not trivial. In [31] this inversion has been implemented relying on the estimation of the pseudoinverse of the rotation matrix. The results in [31] were satisfactory, however an approach based on the Singular Value Decomposition (SVD) is expected to provide a further increase of the estimation accuracy and robustness, also in the presence of blade translation and noisy measurements [34].…”

Section: Motion Recoverymentioning

confidence: 99%

“…In particular, we build upon a preceding phase involving requirement definition, technology selection, and conceptual design of three candidate solutions, followed by preliminary implementation and testing of such solutions. This process was briefly outlined in [29][30], while a discussion of the candidate measurement systems (based on 2-D laser, single camera, and twin cameras) is given in [31], together with their experimental validation and competitive selection based on accuracy performance. As a result, a measuring solution was chosen for the final measurement system development implementation, in view of a fully-operational flight demonstration.…”

Section: Introductionmentioning

confidence: 99%

“…This was eventually chosen as the most appropriate measuring solution for the application considered in the MANOEUVRES project. This activity is described in detail in [31].…”

mentioning

confidence: 99%

See 2 more Smart Citations

A Vision-Based Technique for in-Flight Measurement of Helicopter Blade Motion

et al. 2019

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The measurement of helicopter main rotor blade angles during flight is a key capability to implement advanced applications, such as strategies for the reduction of emitted noise and to develop innovative flight control laws. The approach proposed in this work for the real-time estimation of blade angles is based on a stereoscopic system mounted on the top of the main rotor and pointing to an optical target placed on the blade root. An advanced image-processing algorithm was developed to match the target features in the left and right camera images, which was required for the 3D reconstruction of the target based on a triangulation method. This algorithm was customized for the target used in this specific application, in order to implement a procedure that is both reliable in blob matching and characterized by a very low computation effort. This allowed the system to speeding up the triangulation procedure aimed at obtaining the 3-D coordinates of the features, in view of real-time applications, even with very compact processing units that can be accommodated on the main rotor head. An inverse problem for the 3-D rotation of the target was solved using the Singular Value Decomposition technique, thus improving the robustness of the measurement. The stereoscopic system was developed in order to be integrated on board an AW139 helicopter main rotor hub, equipped with a synchronous lighting device and a pre-processing unit. The latter enabled the system to automatically extract the

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A High-Precision Form-Free Metrological Method of Aeroengine Blades

Shi

et al. 2019

Int. J. Precis. Eng. Manuf.

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Laser and vision-based measurements of helicopter blade angles

Cited by 14 publications

References 26 publications

Durability Analysis of the Prototype Test Rig for Main Rotors

Durability Analysis of the Prototype Test Rig for Main Rotors

A Vision-Based Technique for in-Flight Measurement of Helicopter Blade Motion

A High-Precision Form-Free Metrological Method of Aeroengine Blades

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