150 research outputs found
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Approximating a Target Surface with 1-DOF Rigid Origami
We develop some design examples for approximating a target surface at the
final rigidly folded state of a developable quadrilateral creased paper, which
is folded with a 1-DOF rigid folding motion from the planar state. The final
rigidly folded state is reached due to the clashing of panels. Now we can
approximate some specific types of non-developable surfaces, but we do not yet
fully understand how to approximate an arbitrary surface with a developable
creased paper that has limited DOFs. Our designs might have applications in
areas related to the formation of a shell structure from a planar region
On rigid origami III: local rigidity analysis.
In this article, rigid origami is examined from the perspective of rigidity theory. First- and second-order rigidity are defined from local differential analysis of the consistency constraint; while the static rigidity and prestress stability are defined after finding the form of internal force and load. We will show the hierarchical relation among these local rigidities with examples representing different levels. The development of theory here follows the same path as the conventional rigidity theory for bar-joint frameworks, but starts with different high-order rotational constraints. We also bring new interpretation to the internal force and geometric error of constraints associated with energy. Examining the different aspects of the rigidity of origami might give a novel perspective for the development of new folding patterns, or for the design of origami structures where some rigidity is required
Recommended from our members
On rigid origami III: local rigidity analysis.
In this article, rigid origami is examined from the perspective of rigidity theory. First- and second-order rigidity are defined from local differential analysis of the consistency constraint; while the static rigidity and prestress stability are defined after finding the form of internal force and load. We will show the hierarchical relation among these local rigidities with examples representing different levels. The development of theory here follows the same path as the conventional rigidity theory for bar-joint frameworks, but starts with different high-order rotational constraints. We also bring new interpretation to the internal force and geometric error of constraints associated with energy. Examining the different aspects of the rigidity of origami might give a novel perspective for the development of new folding patterns, or for the design of origami structures where some rigidity is required
New Rigid-foldable Developable Quadrilateral Creased Papers
This article extends the range of 1-DOF rigid-foldable developable
quadrilateral creased papers. In a previous article, we put forward a
sufficient and necessary condition for a quadrilateral creased paper to be
rigid-foldable, and introduce a special sufficient condition that is convenient
for practical use, generating quadrilateral creased paper by stitching basic
units. In this article we develop new flat-foldable units and show how these
can be used to construct a series of more complex rigid-foldable developable
quadrilateral creased papers
Real and complexified configuration spaces for spherical 4-bar linkages
This note is a complete library of symbolic parametrized expressions for both
real and complexified configuration spaces of a spherical 4-bar linkage.
Building upon the previous work from Izmestiev, (2016, Section 2), this library
expands on the expressions by incorporating all four folding angles across all
possible linkage length choices, along with the polynomial relation between
diagonals (spherical arcs). Furthermore, a complete MATLAB app script is
included, enabling visualization and parametrization. The derivations are
presented in a detailed manner, ensuring accessibility for researchers across
diverse disciplines.Comment: arXiv admin note: substantial text overlap with arXiv:2307.1220
MGTBench: Benchmarking Machine-Generated Text Detection
Nowadays large language models (LLMs) have shown revolutionary power in a
variety of natural language processing (NLP) tasks such as text classification,
sentiment analysis, language translation, and question-answering. In this way,
detecting machine-generated texts (MGTs) is becoming increasingly important as
LLMs become more advanced and prevalent. These models can generate human-like
language that can be difficult to distinguish from text written by a human,
which raises concerns about authenticity, accountability, and potential bias.
However, existing detection methods against MGTs are evaluated under different
model architectures, datasets, and experimental settings, resulting in a lack
of a comprehensive evaluation framework across different methodologies
In this paper, we fill this gap by proposing the first benchmark framework
for MGT detection, named MGTBench. Extensive evaluations on public datasets
with curated answers generated by ChatGPT (the most representative and powerful
LLMs thus far) show that most of the current detection methods perform less
satisfactorily against MGTs. An exceptional case is ChatGPT Detector, which is
trained with ChatGPT-generated texts and shows great performance in detecting
MGTs. Nonetheless, we note that only a small fraction of adversarial-crafted
perturbations on MGTs can evade the ChatGPT Detector, thus highlighting the
need for more robust MGT detection methods. We envision that MGTBench will
serve as a benchmark tool to accelerate future investigations involving the
evaluation of state-of-the-art MGT detection methods on their respective
datasets and the development of more advanced MGT detection methods. Our source
code and datasets are available at https://github.com/xinleihe/MGTBench
Sensitivity analysis of machine components thermal properties effects on winding temperature
This paper investigates the sensitivity analysis of winding temperature to key parameters in electrical machine thermal design. With a validated 3D thermal model based on an existing 75kW traction machine for an electric vehicle, the methodology of the sensitivity analysis study is conducted and presented. Finally, further research and practical guidelines on reducing the peak temperature of electrical machines are proposed
Equivalent slot thermal conductivity and back-iron extension effects on machine cooling
Back-iron Extension (BIE) is an effective thermal management technique which reduces the winding temperatures by projecting part of the back iron into the center of slot, thereby shortening the heat transfer path between the coil and back iron. Based on an existing concentrated-wound traction motor, this paper investigates the effects of equivalent slot thermal conductivity of coil on the optimal back iron extension geometry and temperature reduction
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