총 44페이지

Lab of Janus
“The UAM flies at an altitude of 300 to 600 meters.
downtownKorea.OnNov16,2013,ahelicoptercrashed
However,abirdstrikeislikelytooccuratthisaltitude.
in dense fog into the upper section of the 38-story
When a bird strike occurs, in the case of a helicopter
apartment in the posh Gangnam-gu district of Seoul
with only one propeller, the propeller breaks and falls.
and plunged to the ground. The two pilots, Park In-
However,ifthereareseveralpropellersliketheUAM,it
kyuandKohJong-jin,diedatthescene.Theapartment
canlandsafelyevenifonepropellerisbroken.”
buildingwasalsonotsafe.Thecollisionbrokewindows
and damaged the outer wall of the building spanning
In addition, noise is an important consideration as it
the 21st to 27th floors. Through this accident, it can be
operatesinthecitycenter,andthankstothedistributed
predictedthatUAMcrashesinthecitycenterareahigh
propulsion system, some noise problems can be solved.
risk,notonlyforeconomiclossesbutalsoforthelossof
Several small propellers are placed throughout the
lives.
UAM’s aircraft, which is significantly smaller than
the noise generated by one large propeller. Existing
The UAM ultimately aims to fly autonomously
helicopter rotors had to turn very fast because they
using artificial intelligence (AI). However, according
moved with one large blade. However, because the
to a study on public acceptability published in 2020
UAM distributes multiple propellers, the rotational
by the KOTI, of the 101 respondents, 27 responded
speed of each propeller is relatively slower than that of
positivelytounmannedUAMand25respondedneutral,
thehelicopterrotor,butitcanproducethesamepower,
while 49 responded negatively, the highest proportion
which reduces the noise. Professor Yee explained that
among respondents. This shows that citizens have a
distributed propulsion is an efficient way to solve the
noise problem, saying, “The noise is proportional to
Times
themagnitudeofforceasinglepropellerhastoputout.
Korea
Therefore, helicopters using only one rotor are noisy
ⓒThe
because this rotor has to bear all the weight. On the
other hand, using multiple propellers reduces the noise
because it divides the weight.” In fact, the noise of the
UAMis65dB,whichis20percentlowerthanthenoise
of the existing helicopter at 80dB. Moreover, this is
lowerthanthe66dB,theaveragenightnoiseinSeoul.In
otherwords,byusingthedistributedpropulsionsystem,
the safety of the UAM can be improved, and noise
problemscanbesolved.
▲WindowsonanI’ParkapartmentinSamseong-dong,southern
Seoul,werebrokenafterahelicoptercrashedintothebuilding,
Obstacles
killingthetwopilotsonboard.
ⓒdnews
IamScaredofGettingontheUAM:
StillInsufficientSafety
Safety must be assured above all to establish itself
as a new means of transportation after UAM is
commercialized. In the case of civilian aircraft, the
public’s awareness of the risk is sufficient through
existing accident cases. However, because the UAM
is in the pre-introduction stage, there is no history of
accidents. So, the risk of the UAM must be inferred.
▲Vertiportisplannedtobebuiltpreferentiallyinfourplaces:Incheon
Then, let’s look at the case of a helicopter crash in
Airport,GimpoInternationalAirport,CheongnyangniStationin
Seoul,andConventionandExhibitioninSeoul.
20
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