Abstract
In case of a fire at a high-rise building which is densely populated, an extension ladder is used to rescue people who have yet to evacuate to a safe place away from the fire, whereas those who are stranded at a height that is unreachable with the ladder should be promptly saved with different rescue methods. In this case, an application of the tethered flight system capable of receiving power over a power cable from the ground to a multicopter may guarantee effective execution of the rescue plan at the scene where fire is raging without any restrictions of the flight time. This article identified restrictions that should be considered in the design of a multicopter capable of tethered flight aimed to rescue stranded people at an inaccessible location with an extension ladder at a fire-ravaged high-rise building and assessed its feasibility. A power cable capable of providing dozens of kilowatts of electricity should be installed to enable the implementation of the rescue mission using the tethered multicopter. A flexible multi-body dynamics modeling and simulation with viscoelastic characteristics and heavy weight of power cable were carried out to evaluate the effects of such cable of the tethered flight system on the dynamic characteristics of the multicopter. The results indicate that as for a heavy-lift tethered multicopter designed to be utilized for rescue operations, the properties of the power cable, such as weight, rigidity and length, have a major impact on the position and attitude control performance.
Highlights
In contrast with the past when unmanned air vehicles (UAVs) were originally used for military operations, such as reconnaissance or surveillance, they are being proactively employed for civilian purposes
Which are capable of carrying an item less than 2.26 kgf, through unmanned aerial vehicles from AeroVironment offering observation services and communication support at a fire scene and Google’s SkyBender engaging in 5G wireless communication testing, to flying autonomous robots developed by Tevel Aerobotics Technologies to grow fruits without any wastes of human resources by selecting fruits of optimum quality based on their size and conditions [1,2,3,4]. eVTOL vehicles, including multicopters as most representative, are at the center of the situations where unmanned aerial vehicles are being more widely used in the civil application
For the flight of a tethered tethered multicopter for rescue purposes, electrical power should beFor supplied to the electric propulsion system via power cable, and the size of the current bebe supplied to the electric propulsion system via power cable, and the size of the current supplied to the electric propulsion system via power cable, and the size of the current be supplied to the electric propulsion system via power cable, and the size of the current flowing through the power cable varies depending on the size of the supplied voltage
Summary
In contrast with the past when unmanned air vehicles (UAVs) were originally used for military operations, such as reconnaissance or surveillance, they are being proactively employed for civilian purposes. The forces for propeller attitudehas control generated by changing the rotational every pair toare rotate at the same speed in opposite directions,speed gyroscopic of the motor For those reasons, multicopters do not have to use a swashplate and can precession caused by the spinning rotor can be neglected in many cases, and cyclic control is not required as itfrequently. It is aerodynamic possible to guide a The relatively safe generated by changing the rotational speed of the motor For those reasons, landing even if one control of theirarepropellers fails since most of multicopters has more than four multicopters do not have to use a swashplate and can carry out control commands more propellers. Ence of power cable presence does notofgreatly affect the characteristics of multicopters
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
