scholarly journals Computational framework for real-time diagnostics and prognostics of aircraft actuation systems

2021 ◽  
Vol 132 ◽  
pp. 103523
Author(s):  
Pier Carlo Berri ◽  
Matteo D.L. Dalla Vedova ◽  
Laura Mainini
Keyword(s):  
Real Time ◽  
Computational Framework ◽  
Actuation Systems

scholarly journals Real-time 3D reconstruction from single-photon lidar data using plug-and-play point cloud denoisers

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Julián Tachella ◽  
Yoann Altmann ◽  
Nicolas Mellado ◽  
Aongus McCarthy ◽  
Rachael Tobin ◽  
...  
Keyword(s):  
3D Reconstruction ◽  
Real Time ◽  
Single Photon ◽  
Three Dimensional ◽  
Lidar Data ◽  
Computational Framework ◽  
Processing Times ◽  
Outdoor Scenes ◽  
3D Scene ◽  
Time Required

Abstract Single-photon lidar has emerged as a prime candidate technology for depth imaging through challenging environments. Until now, a major limitation has been the significant amount of time required for the analysis of the recorded data. Here we show a new computational framework for real-time three-dimensional (3D) scene reconstruction from single-photon data. By combining statistical models with highly scalable computational tools from the computer graphics community, we demonstrate 3D reconstruction of complex outdoor scenes with processing times of the order of 20 ms, where the lidar data was acquired in broad daylight from distances up to 320 metres. The proposed method can handle an unknown number of surfaces in each pixel, allowing for target detection and imaging through cluttered scenes. This enables robust, real-time target reconstruction of complex moving scenes, paving the way for single-photon lidar at video rates for practical 3D imaging applications.

scholarly journals A novel real‐time computational framework for detecting catheters and rigid guidewires in cardiac catheterization procedures

2018 ◽  
Vol 45 (11) ◽  
pp. 5066-5079 ◽  
Author(s):  
YingLiang Ma ◽  
Mazen Alhrishy ◽  
Srinivas Ananth Narayan ◽  
Peter Mountney ◽  
Kawal S. Rhode
Keyword(s):  
Real Time ◽  
Cardiac Catheterization ◽  
Computational Framework

The FWB Filter with Real-Time Detector to Suppress Category II Pilot Induced Oscillation

2013 ◽  
Vol 278-280 ◽  
pp. 1713-1718
Author(s):  
Li Ming Yu ◽  
Hong Liang Liu
Keyword(s):  
Real Time ◽  
Response Speed ◽  
Control Surface ◽  
Key Factor ◽  
Negative Effect ◽  
Aircraft System ◽  
Actuation Systems ◽  
Short Time ◽  
Rate Limiting

PIO (Pilot Induced Oscillation) is the key factor to damage the flight safety and decrease the quality of manned aircraft. Most of modern PIO records associating with rate limiting or position limiting from actuation systems are defined Category II PIO. The existing compensators, e.g. the Feedback-with-Bypass (FWB) filter, can reduced the oscillation potentiality of the pilot-in-the-loop aircraft system due to rate limiting of control surface, however a negative effect evidently arose which slow the response speed of whole system. This paper uses a Real-Time PIO detector based on Short-time Fourier Transform algorithm as a trigger to determine the switch-off time of the compensator working on the whole system so as to suppress the negative effect on responses of system by FWB. Simulation results show us the positive conclusion that this kind combined FWB filter with Real-Time PIO detector is effectively preventing the Category II PIO without performance decreasing.

Real-time Fault Detection and Prognostics for Aircraft Actuation Systems

2019 ◽  
Author(s):  
Pier Carlo C. Berri ◽  
Matteo Davide Lorenzo Dalla Vedova ◽  
Laura Mainini
Keyword(s):  
Fault Detection ◽  
Real Time ◽  
Actuation Systems

Control Simulation of Hydraulic Adjustment System

2017 ◽  
Author(s):  
Yu-Lun Chiang ◽  
Jen-Chen Chuang ◽  
Jia-Ying Tu
Keyword(s):  
Real Time ◽  
Dynamic Model ◽  
Design Parameters ◽  
Second Step ◽  
External Loading ◽  
Hydraulic Pressure ◽  
Control Techniques ◽  
Adjustment System ◽  
Actuation Systems ◽  
And Control

Hydraulic actuation systems are widely applied in the modern industry, such as robots, excavators, vehicle suspension systems, machine tools, and testing of structural systems, because hydraulic actuation systems are able to provide with large loading capacity. However, the design parameters and control techniques related to temperature, flow volume, flow resistance, etc., affect the stable performance of hydraulic pressure and need to be concerned with. In addition, while an unexpected external loading is applied, which makes a reaction force to the hydraulic oil and results in pressure variations, advanced real-time control techniques is required, in order to maintain a high-level stability and accuracy of the output pressure. To this end, a hydraulic power system is developed in this work, which installs two proportional valves for real-time adjustment of hydraulic pressure. In this paper, the performance compensation of hydraulic pressure involves two steps of control development; the first step is to establish the mathematical model of the hydraulic adjustment system, and the second step is to simulate the pressure response of hydraulic adjustment system with controller design. In this first step, real-time dSPACE control system is utilized to implement identification work, for the purpose of establishing a multi-input/multi-output (MIMO) dynamic model of the active hydraulic adjustment system. Then, based on the dynamic model, the second step develops a feedforward-feedback and a PID controller for the active hydraulic adjustment system; the dynamic responses and control performance are verified via numerical simulation studies.

Some Recent Results in Quiescent Prominence Spectrometry

1979 ◽  
Vol 44 ◽  
pp. 41-47
Author(s):  
Donald A. Landman
Keyword(s):  
Real Time ◽  
Computer System ◽  
Spectral Response ◽  
Absolute Intensity ◽  
Solar Observatory ◽  
Target Size ◽  
Small Target ◽  
Signal Averaging ◽  
Quiescent Prominence

This paper describes some recent results of our quiescent prominence spectrometry program at the Mees Solar Observatory on Haleakala. The observations were made with the 25 cm coronagraph/coudé spectrograph system using a silicon vidicon detector. This detector consists of 500 contiguous channels covering approximately 6 or 80 Å, depending on the grating used. The instrument is interfaced to the Observatory’s PDP 11/45 computer system, and has the important advantages of wide spectral response, linearity and signal-averaging with real-time display. Its principal drawback is the relatively small target size. For the present work, the aperture was about 3″ × 5″. Absolute intensity calibrations were made by measuring quiet regions near sun center.

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