scholarly journals Prototyping, Testing, and Redesign of a Three-Wheel Trekking Wheelchair for Accessible Tourism Applications

2021 ◽  
Vol 11 (20) ◽  
pp. 9641
Author(s):  
Gabriele Baronio ◽  
Ileana Bodini ◽  
Barbara Motyl ◽  
Stefano Uberti
Keyword(s):  
Initial Phase ◽  
Field Tests ◽  
Experimental Results ◽  
Kinematics And Dynamics ◽  
Physical Effort ◽  
Passenger Comfort ◽  
Impaired Mobility ◽  
Testing Phase ◽  
Experimental Field

This work is part of the project called “Gölem project”, started in 2017, about special devices developed to enable the so-called Accessible Tourism. This project aims to design and develop a trekking wheelchair for people with impaired mobility. After an initial phase of design and prototyping, the testing phase has now begun. The objective is to validate several aspects of the design, concerning basic kinematics and dynamics, passenger comfort and physical effort of the carriers. This paper describes the development of qualitative tests for drivability and balance validation of this first prototype. At this stage, a list of features to be investigated was made, suitable trekking paths were chosen, and qualitative experimental field tests were performed. Then, the design of the prototype was modified according to these first experimental results, to improve the wheelchair characteristics. The prototype is now undergoing the modification phase, then further testing will be performed with the use of specific instrumental devices to evaluate the wheelchair itself and to perform the kinematic, dynamical, and comfort characterization.

Design of a specialized tractor to replace draft animals in small farms

2020 ◽  
pp. 1-21
Author(s):  
Guillermo F. Diaz Lankenau ◽  
V. Amos G. Winter
Keyword(s):  
Low Cost ◽  
Field Tests ◽  
Unit Mass ◽  
Maintenance Cost ◽  
User Needs ◽  
Small Farms ◽  
Physical Effort ◽  
Low Mass ◽  
Drawbar Pull ◽  
Design And Testing

Abstract This paper describes the motivation, design, and testing of a specialized farm tractor designed to replace draft animals in small farms, particularly in rural India. The proposed tractor matches the low capital cost of draft animals and has their unique ability to operate between growing crops in narrow inter-row spaces while retaining the major advantages of conventional tractors, such as low maintenance cost and reduced operator physical effort. The proposed tractor was conceived based on user needs and our implementation of a detailed terramechanics model. This tractor has a higher drawbar pull per unit mass compared to conventional tractors – a high drawbar force is needed to match the peak pull of animals, and a low mass is necessary to reduce material and vehicle costs. This quality is achieved by applying nearly the full vehicle's weight on the drive wheels, placing drive wheels in line, and locating the tillage tool between both axles. A proof-of-physics prototype of the design was instrumented to measure drawbar pull and tire slip to validate the terramechanics model and quantify traction performance. It was capable of pulling with more drawbar force per unit mass than conventional tractors and its performance can be accurately predicted by the model. During field tests on a working farm, the vehicle successfully operated in the narrow spaces between growing crops that would typically not be accessible to a low-cost, conventional small tractor. Initial farmer feedback on the design confirmed its high potential for performing farming operations.

scholarly journals Experimental field tests of Batesian mimicry in the swallowtail butterfly Papilio polytes

2018 ◽  
Vol 8 (15) ◽  
pp. 7657-7666 ◽  
Author(s):  
Daniela H. Palmer ◽  
Yue Qian Tan ◽  
Susan D. Finkbeiner ◽  
Adriana D. Briscoe ◽  
Antónia Monteiro ◽  
...  
Keyword(s):  
Field Tests ◽  
Batesian Mimicry ◽  
Swallowtail Butterfly ◽  
Experimental Field ◽  
Papilio Polytes

Experimental results on the Japanese LCT coil in the IFSMTF: pulsed field tests and extended-condition tests

1988 ◽  
Vol 24 (2) ◽  
pp. 767-770 ◽  
Author(s):  
K. Okuno ◽  
T. Kato ◽  
Y. Takahashi ◽  
F. Iida ◽  
H. Tsuji ◽  
...  
Keyword(s):  
Field Tests ◽  
Experimental Results ◽  
Pulsed Field

Possible ways to synchronize phase dynamics in intrinsic Josephson junctions for terahertz radiation

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542033 ◽  
Author(s):  
Feng Liu ◽  
Xiao Hu
Keyword(s):  
Bias Voltage ◽  
Terahertz Radiation ◽  
Open Problem ◽  
Josephson Junctions ◽  
Initial Phase ◽  
Experimental Results ◽  
Phase Dynamics ◽  
Intrinsic Josephson Junctions

Coherent terahertz (THz) radiations based on intrinsic Josephson junctions (IJJs) from a Bi2Sr2CaCu2O[Formula: see text] (BSCCO) mesa under a bias voltage were observed in 2007. Later on, a novel [Formula: see text] phase kink state was proposed which can explain the key experimental results. However, how to drive the system into the [Formula: see text] phase kink state efficiently still remains an open problem. In this work, we propose several ways to synchronize the system to the [Formula: see text] phase kink state. We start from random and typical regular initial phase configurations. It is found that starting from some initial phase configurations, the system can be driven efficiently into the [Formula: see text] phase kink state. The time spent before entering the [Formula: see text] phase kink states for these initial phase configurations is shorter when the initial phase configuration is further away from the uniform phase configuration.

scholarly journals Experimental Field Tests and Finite Element Analyses for Rock Cracking Using the Expansion of Vermiculite Materials

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Chi-hyung Ahn ◽  
Jong Wan Hu
Keyword(s):  
Finite Element ◽  
Field Tests ◽  
Experimental Tests ◽  
Heating Time ◽  
Test Results ◽  
Experimental Field ◽  
Expansion Pressure ◽  
Circular Holes ◽  
Granite Rocks ◽  
Good Agreement

In the previous research, laboratory tests were performed in order to measure the expansion of vermiculite upon heating and to convert it into expansion pressure. Based on these test results, this study mainly focuses on experimental field tests conducted to verify that expansion pressure obtained by heating vermiculite materials is enough to break massive and hard granite rock with an intention to excavate the tunnel. Hexahedral granite specimens with a circular hole perforated in the center were constructed for the experimental tests. The circular holes were filled with vermiculite plus thermal conduction and then heated using the cartridge heater. As a result, all of hexahedral granite specimens had cracks in the surface after 700-second thermal heating and were finally spilt into two pieces completely. The specimen of larger size only requires more heating time and expansion pressure. The material properties of granite rocks, which were obtained from the experimental tests, were utilized to produce finite element models used for numerical analyses. The analysis results show good agreement with the experimental results in terms of initial cracking, propagation direction, and expansion pressure.

scholarly journals A Novel Dictionary Learning Model with PT-HLBP for Palmprint Recognition

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Xiumei Guo ◽  
Weidong Zhou
Keyword(s):  
Feature Extraction ◽  
Hong Kong ◽  
Dictionary Learning ◽  
Time Complexity ◽  
Local Binary Pattern ◽  
Recognition Accuracy ◽  
Experimental Results ◽  
Palmprint Recognition ◽  
Image Rotation ◽  
Testing Phase

A novel projective dictionary pair learning (PDPL) model with statistical local features for palmprint recognition is proposed. Pooling technique is used to enhance the invariance of hierarchical local binary pattern (PT-HLBP) for palmprint feature extraction. PDPL is employed to learn an analysis dictionary and a synthesis dictionary which are utilized for image discrimination and representation. The proposed algorithm has been tested by the Hong Kong Polytechnic University (PolyU) database (v2) and ideal recognition accuracy can be achieved. Experimental results indicate that the algorithm not only greatly reduces the time complexity in training and testing phase, but also exhibits good robustness for image rotation and corrosion.

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