scholarly journals Driving Mechanisms, Motion, and Mechanics of Screw Drive In-Pipe Robots: A Review

2019 ◽  
Vol 9 (12) ◽  
pp. 2514 ◽  
Author(s):  
Tao Ren ◽  
Yin Zhang ◽  
Yujia Li ◽  
Yonghua Chen ◽  
Qingyou Liu
Keyword(s):  
Mechanism Design ◽  
Driving Mechanism ◽  
Mechanical Behaviors ◽  
Pipe Inspection ◽  
Advantages And Disadvantages ◽  
Screw Drive ◽  
Driving Mechanisms ◽  
Pipe Networks ◽  
Design Requirements ◽  
Inspection Tasks

In recent years, interest in in-pipe robot research has been steadily increasing. This phenomenon reflects the necessity and urgency of pipe inspection and rehabilitation as several pipe networks have become outdated around the globe. In-pipe robots can be divided into several groups in accordance with their locomotion principles, each with its own advantages and best suited application scope. Research on the screw drive in-pipe robot (SDIR) has had a rising trend due to the robot’s simple driving mechanism design and numerous advantages. This study compares and analyzes the characteristics of various SDIRs from the aspects of mechanism design, driving principle, and motion and mechanical behaviors. Each SDIR has its own advantages and disadvantages depending on its design requirements and intended applications. A number of prototypes have been fabricated to verify their functionality and efficiency in inspection tasks. This study can provide an up-to-date reference for researchers to conduct further analysis on SDIRs.

scholarly journals The Method for Product Design Selection with Incomplete Linguistic Weight Information Based on Quality Function Deployment in a Fuzzy Environment

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ming Li
Keyword(s):  
Product Design ◽  
Quality Function Deployment ◽  
Design Development ◽  
Quality Function ◽  
Advantages And Disadvantages ◽  
Fuzzy Environment ◽  
Design Requirements ◽  
Design Selection ◽  
The Given ◽  
The Relationship

The selection of a design for the given product is a critical problem in product design development. Focuses of the designers and customers on the design are not identical. In order to bridge the gap and provide a more relaxing way to select the design, a new method based on quality function deployment (QFD) is proposed. In such a method, customers are required to give their linguistic preferences on the design with respect to the customer requirements (CRs). In the rating of the weight of CRs, they are allowed to provide incomplete linguistic weight information and the objective optimization model is proposed to derive the exact linguistic weight information. Designers are required to rate the correlation between design requirements (DRs) and the relationship between the CRs and DRs to construct the house of quality. Opinions given by the customers are translated into the opinions with respect to the DRs based on the QFD. Afterwards, the priorities of the designs and design requirements are determined. The assessment results not only show the contribution of each design requirement to the customer satisfaction but also show the advantages and disadvantages of each design from the designers’ perspective clearly and directly. An example is provided to validate the applicability of the proposed method.

No signal of a plume push force in Indo-Atlantic plate speeds before, during, or after Deccan plume arrival

2021 ◽  
Author(s):  
Graeme Eagles ◽  
Lucía Pérez Díaz ◽  
Karin Sigloch
Keyword(s):  
Late Cretaceous ◽  
Upper Mantle ◽  
Plate Boundary ◽  
Plate Motion ◽  
Driving Mechanism ◽  
African Plate ◽  
Plate Motions ◽  
Driving Mechanisms ◽  
High Resolution Models ◽  
Spreading Rates

<p>Observations of the apparent links between plate speeds and the global distribution of plate boundary types have led to the suggestion that subduction may provide the largest component in the balance of torques maintaining plate motions. This would imply that plate speeds should not exceed the sinking rates of slabs into the upper mantle. Instances of this ‘speed limit’ having been broken may thus hint at the existence of driving mechanisms additional to those resulting from plate boundary forces. The arrival and emplacement of the Deccan-Réunion mantle plume beneath the Indian-African plate boundary in the 67-62 Ma period has been discussed in terms of one such additional driving mechanism, leading to the establishment of “plume-push” hypothesis, which in recent years has gained significant traction. We challenge the model-based observations that form the principal evidence in favour of plume-push: a late Cretaceous pulse of anticorrelating accelerations and decelerations in seafloor spreading rates around the African and Indian plates. Using existing and newly-calculated high-resolution models of plate motion, we instead document an increase in divergence rates at 67-64 Ma. Because of its ubiquity, we consider this increase to be the artefact of a timescale error affecting chrons 29-28. Corrected for this artefact, the evolution of plate speeds resembles a smooth continuation of pre-existing late Cretaceous trends, consistent with the idea that the arrival of the Réunion plume did not substantially affect the existing balance of plate boundary forces on the Indian and African plates. </p>

DEVELOPMENT OF MAGNETIC GEAR MECHANISMS

2017 ◽  
Vol 41 (5) ◽  
pp. 758-770
Author(s):  
Yi-Chang Wu ◽  
Chin-Tsung Chan
Keyword(s):  
Mechanism Design ◽  
Topological Structure ◽  
Design Methodology ◽  
Permanent Magnets ◽  
Graph Representation ◽  
Speed Ratio ◽  
Design Requirements ◽  
Magnetic Gear ◽  
Novel Design ◽  
The Magnetic Field

The purpose of this study is to develop novel magnetic gear mechanisms by using creative mechanism design methodology. First, the flowchart of creative mechanism design methodology is introduced. The schematic diagram and graph representation of a magnetic gear device based on its topological structure are presented. Next, the characteristics of the topological structure of an existing 4-link magnetic gear device are analyzed. Feasible specialized chains are then enumerated, subject to design requirements and constraints. The direction of magnetization in permanent magnets is defined and applied to magnetic gear mechanisms. Finally, 12 novel magnetic gear mechanisms with 5 links are synthesized. The magnetic field, transmitted torque and speed ratio of a novel design are analyzed by 2-D FEA.

scholarly journals An Optimal Design of Driving Mechanism in a 1 Degree of Freedom (d.o.f.) Anthropomorphic Finger

2005 ◽  
Vol 2 (2) ◽  
pp. 103-110 ◽  
Author(s):  
M. Ceccarelli ◽  
N. E. N. Rodríguez ◽  
G. Carbone ◽  
C. Lopez-Cajùn
Keyword(s):  
Optimization Problem ◽  
Evaluation Criteria ◽  
Design Procedure ◽  
Degree Of Freedom ◽  
Driving Mechanism ◽  
Multi Objective Optimization ◽  
Force Transmission ◽  
Driving Mechanisms ◽  
Finger Motion ◽  
Actuation Systems

Mechanisms can be used in finger design to obtain suitable actuation systems and to give stiff robust behavior in grasping tasks. The design of driving mechanisms for fingers has been attached at LARM in Cassino with the aim to obtain one degree of freedom actuation for an anthropomorphic finger. The dimensional design of a finger-driving mechanism has been formulated as a multi-objective optimization problem by using evaluation criteria for fundamental characteristics regarding with finger motion, grasping equilibrium and force transmission. The feasibility of the herein proposed optimum design procedure for a finger-driving mechanism has been tested by numerical examples that have been also used to enhance a prototype previously built at LARM in Cassino.

Finite Element Model of High-Voltage Transmission Tower Confirmed

2013 ◽  
Vol 459 ◽  
pp. 625-630
Author(s):  
Chun Cheng Liu ◽  
Qiang Sheng Xu
Keyword(s):  
Hybrid Model ◽  
Element Model ◽  
Local Analysis ◽  
Transmission Tower ◽  
Maximum Displacement ◽  
Advantages And Disadvantages ◽  
Modeling Analysis ◽  
Ice Conditions ◽  
Design Requirements ◽  
Angle Steel

Model selection is carried out structural analysis Transmission Tower one of the priorities. Through the establishment of traditional beams - truss hybrid model, improved beam - beam hybrid model and frame model, a modeling analysis of angle steel tower cathead. First on the transmission tower modal analysis, and then the common wind conditions and ice conditions of the maximum stress and maximum displacement results are discussed, and then local analysis. Identify similarities and differences between the three models, discusses the advantages and disadvantages of the model to meet the design requirements of the situation and the results can be obtained more reasonable feasibility.

A Design of Innovative Experiment Platform Based on the Research of Flapping-Wing Aircraft

2014 ◽  
Vol 651-653 ◽  
pp. 587-592
Author(s):  
Bing Hao Zhu ◽  
Xiao Yi Jin ◽  
Li Li Zhao ◽  
Jing Yuan Zhang ◽  
Hua Cheng Tao
Keyword(s):  
Mechanism Design ◽  
Flapping Wing ◽  
Driving Mechanism ◽  
Experimental Platform ◽  
Experiment Platform ◽  
Design And Implementation ◽  
Design Scheme ◽  
Development Processes ◽  
Motion Parameters ◽  
Platform System

According to the fact that it need several tests to determine the size and motion parameters of the flapping-wing aircraft in the development processes, the paper proposed a design scheme of flapping wing system experimental platform. Separately from the scheme, the system platform, driving mechanism design, motion parameters change, described in detail the design and implementation of this innovation experiment platform. Users can simulate and debug the platform system to determine the performance of the flapping-wing mechanism.

scholarly journals Degree of Achievability of Omnidirectional Motion in Various Mobile Robot Designs: A Review

2016 ◽  
Vol 5 (1) ◽  
pp. 17
Author(s):  
Ajju Raja Justus
Keyword(s):  
Mobile Robot ◽  
Control Mechanism ◽  
Operating Conditions ◽  
Driving Mechanism ◽  
Functional Requirement ◽  
Current Field ◽  
Driving Mechanisms ◽  
And Control ◽  
Comprehensive Study

<p>In the current field of robotics, many new robots are being developed based on different working principles. Each robot has its own strengths and weaknesses. Omnidirectional mobility is a major functional requirement for performing more complex actions. This article is a comprehensive study of some of the robots developed by different people with distinctive driving mechanisms. The actuation, driving method, operating conditions and control mechanism of all the selected robots is studied. Then finally, all the considered robots are compared based on various parameters to gauge the efficiency and degree of achievability of omnidirectional motion in each robot. Therefore, by the end of this article, we can have an understanding of how much effective each driving mechanism is in producing omnidirectional mobility.</p>

Study on Key Technology of Flatbed Inkjet Process and Equipment

2013 ◽  
Vol 312 ◽  
pp. 558-561
Author(s):  
Yu Qing Zhang ◽  
Yuan Sheng Qi ◽  
Shi Ying Zhao ◽  
Xiao Hua Wang ◽  
Jun Zhong Guo
Keyword(s):  
Inkjet Printing ◽  
Technology Development ◽  
Mechanical Design ◽  
Key Technology ◽  
Print Head ◽  
Development Status ◽  
Advantages And Disadvantages ◽  
Design Requirements ◽  
Inkjet Printing Technology ◽  
Development Prospects

Based on the flatbed inkjet printing technology development status at home and abroad, provided an overview of the flatbed inkjet device and technology principle, and introduced the required ink and plate. To focus on the flatbed inkjet device which the plate is fixed and the print head moves, put forward the mechanical design requirements. Besides, from the structure and layout of the device, elaborated the types of the flatbed inkjet device innovative ideas of design. Finally, summarized the advantages and disadvantages of the flatbed inkjet technology, and forecast its development prospects. To have some help in better understanding and application of flatbed inkjet technology.

Research on the Spatial Morphology of City Central District of Single Core Structure

2013 ◽  
Vol 409-410 ◽  
pp. 833-843
Author(s):  
Jin Li ◽  
Yue Su ◽  
Jun Yan Yang
Keyword(s):  
Spatial Structure ◽  
Central Area ◽  
Hard Core ◽  
Core Structure ◽  
Driving Mechanism ◽  
Advantages And Disadvantages ◽  
Central District ◽  
Spatial Morphology ◽  
General Mode ◽  
Cross Type

Single core spatial structure is the most general mode of city central district, with the feature of circle structure. Under the influence of hard core form, the spatial morphology of the structure is divided into three types: line type, cross type and agglomeration type. These three types show the three modes of space development of single core structure, which have their respective forming conditions and spatial characteristics. This paper analyzes the gathering mode and driving mechanism of the three types of the spatial structure, and the advantages and disadvantages of the three types, meanwhile, provides a reference for leading the development of the single-core structure of the central area reasonably.

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