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Terahertz Spectroscopic Characterization and Thickness Evaluation of Internal Delamination Defects in GFRP Composites
AbstractThe use of terahertz time-domain spectroscopy (THz-TDS) for the
nondestructive testing and evaluation (NDT&E) of materials and structural
systems has attracted significant attention over the past two decades due to its
superior spatial resolution and capabilities of detecting and characterizing
defects and structural damage in non-conducting materials. In this study, the
THz-TDS system is ...
Direct-Ink-Writing Printed Strain Rosette Sensor Array with Optimized Circuit Layout
Tập 36 Số 1
AbstractThe full-field multiaxial strain measurement is highly desired for
application of structural monitoring but still challenging, especially when the
manufacturing and assembling for large-area sensing devices is quite difficult.
Compared with the traditional procedure of gluing commercial strain gauges on
the structure surfaces for strain monitoring, the recently developed
Direct-Ink-Writing...
Application of Nonlinear Lamb Wave Mixing Method for Residual Stress Measurement in Metal Plate
AbstractHarmonic nonlinear ultrasound can offer high sensitivity for residual
stress measurements; however, it cannot be used for local stress measurements at
a point in space and exhibits nonlinear distortions in the experimental system.
This paper presents a feasibility study on the measurement of residual stress in
a metal plate using a nonlinear Lamb wave-mixing technique. The resonant
conditi...
Smooth Trajectory Planning for a Cable Driven Parallel Waist Rehabilitation Robot Based on Rehabilitation Evaluation Factors
Tập 36 Số 1
AbstractRehabilitation robots can help physiatrists to assist patients in
improving their movement ability. Due to the interaction between rehabilitation
robots and patients, the robots need to complete rehabilitation training on a
safe basis. This paper presents an approach for smooth trajectory planning for a
cable-driven parallel waist rehabilitation robot (CDPWRR) based on the
rehabilitation e...
Inverted Modelling: An Effective Way to Support Motion Planning of Legged Mobile Robots
Tập 36 Số 1
AbstractThis paper presents an effective way to support motion planning of
legged mobile robots—Inverted Modelling, based on the equivalent metamorphic
mechanism concept. The difference from the previous research is that we herein
invert the equivalent parallel mechanism. Assuming the leg mechanisms are hybrid
links, the body of robot being considered as fixed platform, and ground as
moving platfo...
Investigation of Experimental Devices for Finger Active and Passive Tactile Friction Analysis
Tập 36 Số 1
AbstractComplicated tribological behavior occurs when human fingers touch and
perceive the surfaces of objects. In this process, people use their exploration
style with different conditions, such as contact load, sliding speed, sliding
direction, and angle of orientation between fingers and object surface
consciously or unconsciously. This work addressed interlaboratory experimental
devices for fi...
Ultralong Stretchable Soft Actuator (US2A): Design, Modeling and Application
Tập 36 Số 1
AbstractActuator plays a significant role in soft robotics. This paper proposed
an ultralong stretchable soft actuator (US2A) with a variable and sizeable
maximum elongation. The US2A is composed of a silicone rubber tube and a bellows
woven sleeve. The maximal extension can be conveniently regulated by just
adjusting the wrinkles’ initial angle of the bellows woven sleeve. The
kinematics of US2A ...
Numerical Visualization of Grease Flow in a Gearbox
Tập 36 Số 1
AbstractLubricating greases are widely used in e.g. open gear drives and
gearboxes with difficult sealing conditions. The efficiency and heat balance of
grease-lubricated gearboxes depend strongly on the lubrication mechanisms
channeling and circulating, for which the grease flow is causal. The
computational fluid dynamics opens up the possibility to visualize and
understand the grease flow in gea...
Thermal-Mechanical Effect and Removal Mechanism of Ti-6Al-4V During Laser-Assisted Grinding
AbstractThe low density and high corrosion resistance of titanium alloy make it
a material with various applications in the aerospace industry. However, because
of its high specific strength and poor thermal conductivity, there are problems
such as high cutting force, poor surface integrity, and high cutting temperature
during conventional machining. As an advanced processing method with high
effi...
A Compensation Algorithm for Large Element Characterizing the Damage Evolution Process and Its Application to Structure Collisions
AbstractWhen simulating the process from elastic–plastic deformation, damage to
failure in a metal structure collision, it is necessary to use the large shell
element due to the calculation efficiency, but this would affect the accuracy of
damage evolution simulation. The compensation algorithm adjusting failure strain
according to element size is usually used in the damage model to deal with the
...