Tech Briefs Magazine - August 2021 - 32

Mechanical &
Fluid Systems
the tire structure to undergo high levels
of deformation without permanent damage.
Because these tires do not rely on
air, the risks associated with a flat tire are
eliminated and tire stiffness never varies
(the tires never run under-inflated). Fur -
thermore, this airless tire design may
enable the redesigning of wheel and
braking systems.
This illustration depicts a graphical representation of the two-layer SMA structure.
wheel, which sets the overall tire geometry
and provides added strength in the
radial and axial directions. The secondary
layer consists of smaller SMA springs
interlocked with each other as well as
the primary coil, acting as a sheath that
sets the coil spacing and provides the
necessary shear stiffness.
SMAs are superelastic in nature and
can take up to 8% effective reversible
strain without yielding. The SMAs can
handle up to 30x more strain, allowing
Periodic Wave Disc Brake Rotor
The lightweight brake rotor design with high heat dissipation uses novel surface
cooling technology.
Marshall Space Flight Center, Alabama
eveloped by innovators at NASA
Marshall, the Periodic Wave Disc
Brake Rotor offers improved perfor -
mance for potential applications in
racecars, motorcycles, and specifically,
for electric vehicles (EVs) equipped
with regenerative braking systems.
The periodic wave rotor technology
is a suite of rotor designs that provides
dramatic weight reduction along with
high heat dissipation - two of the primary
challenges associated with highperformance
braking systems.
Increasing any vehicle's racing performance
involves decreasing the ro -
tational moment of inertia and brake
system weight, which allow the vehicle
to accelerate faster, change direction
better, and require less energy
when doing all of the above. For racecars,
reducing braking system weight
is all about achieving better lap times.
For any popular EVs, however, de creased
electrical energy expenditure provides
increased travel range.
D
32
Cov
cation, a dramatic reduction of the
rotor material itself can be se lected
from either steel, oxygen-diffused titanium,
or an aluminum forging alloy.
A two-piece floating rotor assembly
is designed to further reduce the
weight of the rotor's mounting hub
and its rotational moment of inertia,
while simultaneously minimizing the
rotor's thermal expansion, stress,
warping, or distortion experience
during extreme frictional heating
generated from repeated hard braking
actions under high-speed racing
conditions.
The periodic wave disc brake rotor offers improved performance
for potential applications in racecars, motorcycles,
and electric vehicles.
The brake rotor is a novel yet simple
and cost-effective design to maximize
weight reduction and heat dissipation.
This is accomplished through NASA's
proprietary concept of combining the
forced convection, radiation, and conduction
of airflow over the brake ro tor's
surface. Depending upon the ap pli -
www.techbriefs.com
ToC
The rotor can be easily implemented
into any existing vehicles with
either hub-mounted or wheel rimmounted
brake systems.
NASA is actively seeking licensees to
commercialize this technology. Please contact
NASA's Licensing Concierge at AgencyPatent-Licensing@mail.nasa.gov
or call
us at 202-358-7432 to initiate licensing discussions.
Follow this link for more information:
https://technology.nasa.gov/patent/
MFS-TOPS-106.
Tech Briefs, August 2021
The first bicycle tire prototype was estimated
to have a tire stiffness comparable
to a road bike tire inflated to 75 psi but
with improved lateral and shear stiffness.
By varying the SMA wire geometry, a wide
range of tire sizes and stiffnesses is achievable.
Rubber tread surfaces may be at -
tached to the outside of the SMA tire for
sufficient traction on a variety of terrain.
NASA is actively seeking licensees to commercialize
this technology. Please contact
NASA's Licensing Concierge at AgencyPatent-Licensing@mail.nasa.gov
or call us
at 202-358-7432 to initiate licensing discussions.
Follow this link for more information:
https://technology.nasa.gov/patent/LEWTOPS-161.
https://technology.nasa.gov/patent/LEW-TOPS-161 https://technology.nasa.gov/patent/LEW-TOPS-106 http://www.techbriefs.com http://www.abpi.net/ntbpdfclicks/l.php?202108MDNAV

Tech Briefs Magazine - August 2021

Table of Contents for the Digital Edition of Tech Briefs Magazine - August 2021

Tech Briefs Magazine - August 2021 - Intro
Tech Briefs Magazine - August 2021 - Sponsor
Tech Briefs Magazine - August 2021 - Cov1
Tech Briefs Magazine - August 2021 - Cov2
Tech Briefs Magazine - August 2021 - 1
Tech Briefs Magazine - August 2021 - 2
Tech Briefs Magazine - August 2021 - 3
Tech Briefs Magazine - August 2021 - 4
Tech Briefs Magazine - August 2021 - 5
Tech Briefs Magazine - August 2021 - 6
Tech Briefs Magazine - August 2021 - 7
Tech Briefs Magazine - August 2021 - 8
Tech Briefs Magazine - August 2021 - 9
Tech Briefs Magazine - August 2021 - 10
Tech Briefs Magazine - August 2021 - 11
Tech Briefs Magazine - August 2021 - 12
Tech Briefs Magazine - August 2021 - 13
Tech Briefs Magazine - August 2021 - 14
Tech Briefs Magazine - August 2021 - 15
Tech Briefs Magazine - August 2021 - 16
Tech Briefs Magazine - August 2021 - 17
Tech Briefs Magazine - August 2021 - 18
Tech Briefs Magazine - August 2021 - 19
Tech Briefs Magazine - August 2021 - 20
Tech Briefs Magazine - August 2021 - 21
Tech Briefs Magazine - August 2021 - 22
Tech Briefs Magazine - August 2021 - 23
Tech Briefs Magazine - August 2021 - 24
Tech Briefs Magazine - August 2021 - 25
Tech Briefs Magazine - August 2021 - 26
Tech Briefs Magazine - August 2021 - 27
Tech Briefs Magazine - August 2021 - 28
Tech Briefs Magazine - August 2021 - 29
Tech Briefs Magazine - August 2021 - 30
Tech Briefs Magazine - August 2021 - 31
Tech Briefs Magazine - August 2021 - 32
Tech Briefs Magazine - August 2021 - 33
Tech Briefs Magazine - August 2021 - 34
Tech Briefs Magazine - August 2021 - 35
Tech Briefs Magazine - August 2021 - 36
Tech Briefs Magazine - August 2021 - 37
Tech Briefs Magazine - August 2021 - 38
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Tech Briefs Magazine - August 2021 - 40
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Tech Briefs Magazine - August 2021 - 43
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Tech Briefs Magazine - August 2021 - 45
Tech Briefs Magazine - August 2021 - 46
Tech Briefs Magazine - August 2021 - 47
Tech Briefs Magazine - August 2021 - 48
Tech Briefs Magazine - August 2021 - 49
Tech Briefs Magazine - August 2021 - 50
Tech Briefs Magazine - August 2021 - 51
Tech Briefs Magazine - August 2021 - 52
Tech Briefs Magazine - August 2021 - 53
Tech Briefs Magazine - August 2021 - 54
Tech Briefs Magazine - August 2021 - 55
Tech Briefs Magazine - August 2021 - 56
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Tech Briefs Magazine - August 2021 - 58
Tech Briefs Magazine - August 2021 - 59
Tech Briefs Magazine - August 2021 - 60
Tech Briefs Magazine - August 2021 - Cov3
Tech Briefs Magazine - August 2021 - Cov4
Tech Briefs Magazine - August 2021 - MD-Cov1
Tech Briefs Magazine - August 2021 - MD-Cov2
Tech Briefs Magazine - August 2021 - MD-1
Tech Briefs Magazine - August 2021 - MD-2
Tech Briefs Magazine - August 2021 - MD-3
Tech Briefs Magazine - August 2021 - MD-4
Tech Briefs Magazine - August 2021 - MD-5
Tech Briefs Magazine - August 2021 - MD-6
Tech Briefs Magazine - August 2021 - MD-7
Tech Briefs Magazine - August 2021 - MD-8
Tech Briefs Magazine - August 2021 - MD-9
Tech Briefs Magazine - August 2021 - MD-10
Tech Briefs Magazine - August 2021 - MD-11
Tech Briefs Magazine - August 2021 - MD-12
Tech Briefs Magazine - August 2021 - MD-13
Tech Briefs Magazine - August 2021 - MD-14
Tech Briefs Magazine - August 2021 - MD-15
Tech Briefs Magazine - August 2021 - MD-16
Tech Briefs Magazine - August 2021 - MD-17
Tech Briefs Magazine - August 2021 - MD-18
Tech Briefs Magazine - August 2021 - MD-19
Tech Briefs Magazine - August 2021 - MD-20
Tech Briefs Magazine - August 2021 - MD-21
Tech Briefs Magazine - August 2021 - MD-22
Tech Briefs Magazine - August 2021 - MD-23
Tech Briefs Magazine - August 2021 - MD-24
Tech Briefs Magazine - August 2021 - MD-25
Tech Briefs Magazine - August 2021 - MD-26
Tech Briefs Magazine - August 2021 - MD-27
Tech Briefs Magazine - August 2021 - MD-28
Tech Briefs Magazine - August 2021 - MD-29
Tech Briefs Magazine - August 2021 - MD-30
Tech Briefs Magazine - August 2021 - MD-31
Tech Briefs Magazine - August 2021 - MD-32
Tech Briefs Magazine - August 2021 - MD-33
Tech Briefs Magazine - August 2021 - MD-34
Tech Briefs Magazine - August 2021 - MD-35
Tech Briefs Magazine - August 2021 - MD-36
Tech Briefs Magazine - August 2021 - MD-37
Tech Briefs Magazine - August 2021 - MD-38
Tech Briefs Magazine - August 2021 - MD-39
Tech Briefs Magazine - August 2021 - MD-40
Tech Briefs Magazine - August 2021 - MD-Cov3
Tech Briefs Magazine - August 2021 - MD-Cov4
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