scholarly journals Autonomous recovery of a Fixed-wing UAV Using a Line Suspended Between Two Multirotor UAVs

2020 ◽  
pp. 1-1
Author(s):  
Mads Friis Bornebusch ◽  
Tor Arne Johansen
Keyword(s):  
Autonomous Recovery

scholarly journals Autonomous Recovery from Spacecraft Plan Failures by Regulatory Repair While Retaining Operability

Aerospace ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 40
Author(s):  
Rui Xu ◽  
Chao Chen ◽  
Siyao Lu ◽  
Zhaoyu Li
Keyword(s):  
Causal Analysis ◽  
Space Environment ◽  
Ground Control ◽  
Search Process ◽  
Execution Plan ◽  
Factors Associated ◽  
Failure State ◽  
Long Time ◽  
Autonomous Recovery ◽  
Partial Execution

Pre-designed spacecraft plans suffer from failure due to the uncertain space environment. In this case, instead of spending a long time waiting for ground control to upload a feasible plan in order to achieve the mission goals, the spacecraft could repair the failed plan while executing another part of the plan. This paper proposes a method called Isolation and Repair Plan Failures (IRPF) for a spaceship with durable, concurrent, and resource-dependent actions. To enable the spacecraft to perform some actions when a plan fails, IRPF separates all defective actions from executable actions in the pre-designed plan according to causal analysis between the failure state and the established plan. Then, to address the competition between operation and repair during the partial execution of the plan, IRPF sets up several regulatory factors associated with the search process for a solution, and then repairs the broken plan within the limits of these factors. Experiments were carried out in simulations of a satellite and a multi-rover system. The results demonstrate that, compared with replanning and other plan-repair methods, IRPF creates an execution plan more quickly and searches for a recovery plan with fewer explored state nodes in a shorter period of time.

The Lake Trial about the Autonomous Recovery of the UUV by the USV Towed System

2019 ◽  
Author(s):  
Hai-tao GU ◽  
Ling-shuai MENG ◽  
Dong-sheng TANG ◽  
Ning LI ◽  
Zi-qing WANG ◽  
...  
Keyword(s):  
Autonomous Recovery

scholarly journals Marine UAV–USV Marsupial Platform: System and Recovery Technic Verification

2020 ◽  
Vol 10 (5) ◽  
pp. 1583 ◽  
Author(s):  
Hongda Zhang ◽  
Yuqing He ◽  
Decai Li ◽  
Feng Gu ◽  
Qi Li ◽  
...  
Keyword(s):  
Physical Simulation ◽  
Current System ◽  
Accurate Estimation ◽  
Unmanned Systems ◽  
Mobile Platforms ◽  
Practical Applications ◽  
Heterogeneous Platform ◽  
Short Period ◽  
Recovery System ◽  
Autonomous Recovery

Heterogeneous unmanned systems consisting of unmanned aerial vehicles (UAVs) and unmanned surface vehicles (USVs) have great application potential in marine environments. At present, the fully autonomous recovery of UAVs is a key problem that restricts any significant application of a heterogeneous unmanned system. This paper presents a novel fully autonomous recovery system, covering the entire process of recovery of small fixed-wing UAVs on mobile platforms at sea. We describe methods or solutions for the key problems encountered by the current system, including active modeling of the UAV–USV heterogeneous platform motion model, accurate estimation of the highly dynamic relative motion of the heterogeneous platform, dynamic analysis of the arresting cable system, and compliance control of the manipulator recovery system. Based on these methods, a physical simulation platform for the fully autonomous recovery system, including an actively adjustable arresting cable, manipulator compliance recovery system, and other subsystems, is developed and verified through experiments. The experiments show that the system proposed in this study can achieve full autonomous recovery of a small ship-based fixed-wing UAV with a high success rate in a short period. This system is the foundation for practical applications of UAV–USV heterogeneous unmanned systems in the marine environment.

scholarly journals Increasing Patient Empowerment in TKA-Recovery Via a Mobile Application: an Observational Study

10.29007/774f ◽  
2019 ◽  
Author(s):  
Philippe Van Overschelde ◽  
Stefaan Van Onsem ◽  
Ward Servaes ◽  
Alain Kalmar
Keyword(s):  
Patient Empowerment ◽  
Clinical Results ◽  
Basic Function ◽  
Patient Acceptance ◽  
Mobile Health Application ◽  
Level Of Activity ◽  
Total Knee ◽  
Autonomous Recovery ◽  
High Level ◽  
Health Application

During the last few years, total knee arthroplasty has evolved from basic surgery to restore basic function, to a fast-track procedure to relief pain and get the patients back to a high level of activity.. However, the way physiotherapy is performed, remained the same. This paper presents the results of 185 patients that used a mobile health application to track their recovery. Adherence and clinical results were evaluated and reported. Our study demonstrated an excellent patient acceptance and compliance of the outpatient autonomous recovery app. Patient satisfaction was outstanding, and functional recovery was securely within conventional range.

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