scholarly journals Dr Mamoru Kawaguchi: His grand thought, prominent works, and contribution to the advancement of spatial structures

2020 ◽  
Vol 35 (1-2) ◽  
pp. 12-27
Author(s):  
Shiro Kato
Keyword(s):  
Structural Design ◽  
Olympic Games ◽  
Concept Analysis ◽  
Design Concept ◽  
Swimming Pool ◽  
Spatial Structures ◽  
Fail Safe ◽  
And Control ◽  
World Exhibition

This article describes an engineer, his grand thought, prominent works, and contribution to the advancement of spatial structures based on geometry and mechanism. He is Dr Mamoru Kawaguchi, who lived in Japan for almost 90 years from 1932 to 2019. In his life, he designed a large number of epoch-making structures in the field of spatial structures in Japan and worldwide. These encompass structures of wood, concrete, steel, fabrics, and even air and water. His approach for structural design is very strict and broad with respect to geometry and mechanism and with respect to design concept, analysis, construction, fail-safe, and control as same as an academician of philosophy. The structures of Yoyogi Swimming Pool for the Tokyo Olympic Games 1964, the Grand Roof of the Osaka World Exhibition 1970, Fuji Group Pavilion, Pantadome, Suspendome, and a jumbo fabric carp flying across the sky are introduced in this article in order to remember him and to highlight his grand thought and eminent spatial structures.

scholarly journals Structural design and control of modular tensegrity structures

2014 ◽  
Vol 19 (6) ◽  
pp. 687-702 ◽  
Author(s):  
Sarah Amouri ◽  
Julien Averseng ◽  
Jérôme Quirant ◽  
Jean-François Dube
Keyword(s):  
Structural Design ◽  
Tensegrity Structures ◽  
And Control

Design of Hydraulic Station of Crawler Hydraulic Drilling Rig

2014 ◽  
Vol 889-890 ◽  
pp. 380-384
Author(s):  
Zhi Liu ◽  
Peng Fang ◽  
Di Wu ◽  
Dong Li
Keyword(s):  
Design Process ◽  
Structural Design ◽  
Control Technique ◽  
Pumping Station ◽  
Drilling Rig ◽  
Pumping Stations ◽  
Hydraulic Station ◽  
Scheme Selection ◽  
And Control

This article describes the design process of pumping stations of crawler full hydraulic drilling rig. The principle of full hydraulic drilling rig pumping station,scheme selection, hydraulic components selection and structural design of the tank were presented. The system used double loops in which some advanced hydraulic components and control technique were adopt.

The Doctrine of Manifest Danger and its Relationship to Reliability, Preventive Maintenance and Fail-Safe Design

1993 ◽  
Author(s):  
Ralph L. Barnett
Keyword(s):  
Preventive Maintenance ◽  
Design Concept ◽  
Legal Issue ◽  
Proximate Cause ◽  
Reliability Design ◽  
The Bible ◽  
Safety Technology ◽  
Fail Safe ◽  
Over Time

Abstract “Dust thou art, and unto dust shalt thou return.”1 Man has made no observations that would challenge this notion from the Bible and certainly safeguarding systems fall into lockstep. Safety technology has responded to the reality of eventual degradation using four general approaches: reliability design, preventive maintenance, fail-safe design and danger manifestation. The optimum implementation of these approaches will still not eliminate accidents; indeed, no work of manor nature is or can be danger free. Nevertheless, these sophisticated approaches are capable of producing ever-increasing levels of safety, albeit, with attendant ever-increasing cost. It is at once unfortunate and unacceptable that common law2 is not equally sophisticated in dealing with the inevitable failure of safeguarding systems over time. This paper introduces The Doctrine of Manifest Danger which is defined as a design concept using direct cues or indicator devices to communicate to the community of users that the safety of a system has been compromised before injuries occur. Furthermore, the paper addresses a related legal issue by distinguishing between proximate cause and cause of action.

Fabrication of Direct Fiber-Reinforced Posts: A Structural Design Concept

2001 ◽  
Vol 13 (4) ◽  
pp. 228-240 ◽  
Author(s):  
DOUGLAS A. TERRY ◽  
PETER T. TRIOLO ◽  
EDWARD J. SWIFT
Keyword(s):  
Structural Design ◽  
Design Concept ◽  
Fiber Reinforced

Fail-Safe Structural Design

1958 ◽  
Vol 62 (574) ◽  
pp. 757-760
Author(s):  
W. T. Koiter
Keyword(s):  
Fatigue Strength ◽  
Structural Design ◽  
Flight Plan ◽  
Design Loads ◽  
Design Requirements ◽  
Fail Safe

MR. Harpur's interesting and stimulating paper (page 363, May 1958 Journal) is obviously of great importance to all who have to face the problem of fatigue strength of aircraft. These comments all refer to Section 3—Design Loads. Mr. Harpur's conclusions are based on analysis of a typical flight plan of a medium haul civil transport, and are formulated as a proposal for two fail-safe design requirements.

VIBRATION CHARACTERISTICS SIMULATION OF WRINKLED CIRCULAR ANNULUS-SHAPED GOSSAMER SPACE STRUCTURE

2008 ◽  
Vol 05 (01) ◽  
pp. 189-198 ◽  
Author(s):  
CHANGGUO WANG ◽  
XINGWEN DU ◽  
XIAODONG HE ◽  
GUOZHI SONG
Keyword(s):  
Structural Design ◽  
Membrane Structure ◽  
Space Structure ◽  
Vibration Characteristics ◽  
Structural Vibration ◽  
Space Structures ◽  
Deformation State ◽  
Wrinkling Analysis ◽  
Wrinkled Membrane ◽  
And Control

Ultra-lightweight Gossamer space structures have received the wide attention due to their small packaging volume and low launching cost. Since wrinkles are a common deformation state and the main failure mode of such structures and vibration behaviors are the major factor of the structural design and control, a better understanding of the wrinkling characteristics and the vibration behaviors of the wrinkled membrane structure is thus very essential and desirable. In this paper, a modal analysis method incorporating the wrinkling analysis is presented to simulate the vibration characteristics of a wrinkled membrane structure. The effects of the wrinkles on the structural vibration behaviors are also summarized in detail in the end.

The Design of a Powered Ankle Prosthesis With Electrohydrostatic Actuation

2015 ◽  
Author(s):  
Tian Yu ◽  
Andrew Plummer ◽  
Pejman Iravani ◽  
Jawaad Bhatti
Keyword(s):  
Simulation Model ◽  
Weight Reduction ◽  
Design Concept ◽  
Performance Characteristics ◽  
Passive Mode ◽  
Ankle Prosthesis ◽  
Initial Trial ◽  
Passive Damper ◽  
Simulation Results ◽  
And Control

This paper presents the design and modelling of a new powered ankle prosthesis which combines electrohydrostatic actuation with a controllable passive damper. The new powered ankle prosthesis can switch quickly between passive mode and powered assistance mode, and is intended to just give assistance at certain points within the gait cycles, such as during toe push-off. The design concept and a prototype built to demonstrate the concept are presented. A simulation model was developed to help analyse the performance characteristics. The structure and parameterisation of the simulation model are described. A comparison between simulation results and experiment results is undertaken in order to validate the model and assist in the optimisation of the design. Some results from an initial trial with amputees are included in the paper. According to subjective feedback from the amputees, the new powered ankle prosthesis provides sufficient force at push-off to assist with walking. Future investigations will be focusing on the compactness, weight reduction and control of the powered ankle prosthesis.

A Novel Compliant Actuator With Load-Dependent Variable Stiffness: Design Concept and Control

2016 ◽  
Author(s):  
Lu Lu ◽  
Jiawei Li ◽  
Cong Wang ◽  
Dan Strassberg
Keyword(s):  
Motion Control ◽  
External Load ◽  
Load Condition ◽  
Variable Stiffness ◽  
Design Concept ◽  
Inertia Force ◽  
Precision Motion Control ◽  
Precision Motion ◽  
And Control ◽  
Compliant Actuator

To develop the next generation of high-performance robots capable of working in human environments, it is required that the joint actuators have variable stiffness to achieve both precision motion control and ability of reaction under unexpectedly huge impact caused by collision with obstacles or human. Variable stiffness actuators (VSA) partially realize such objectives by employing an auxiliary input to change the joint stiffness. However, it requires prior information of external load condition. Load sensors or online load estimation techniques need to be implemented to detect sudden unexpected load for stiffness adjustment, adding complexity to the system with bandwidth issues. In this paper, we propose a new design of compliant actuator in which the stiffness automatically varies depending on the unexpected external load. A novel doubly-clamped box structure is used to connect the load inertia to the motor inertia. Specifically, the load inertia is confined inside a box clamped by two stoppers on two opposite sides with two pre-compressed springs. A secondary motor connects to the load inertia through another spring, compensating for known unbalanced forces such as gravity, Coriolis force and inertia force. It is shown that if the unexpected external load force is below the pre-compression force of the springs, the load inertia will be confined exactly within the box and the system behaves like a rigid actuator, otherwise one of the springs will be further compressed and the system behaves like a compliant actuator. Such a mechanical structure has the ability of achieving both precision motion control and automatic reaction under unexpectedly huge external impact, without the need of additional load sensing/estimation. Control algorithms for accurate position tracking under potentially huge unexpected load is developed for this new type of actuator. Simulations are conducted to verify the effectiveness of the design concept and control.

DESIGN ANALYSIS OF THE PROPULSION AND CONTROL SYSTEM OF AN UNDERACTUATED REMOTELY OPERATED VEHICLE USING AXIOMATIC DESIGN THEORY — PART 1

2005 ◽  
Vol 15 (02) ◽  
pp. 153-160
Author(s):  
T. H. KOH ◽  
F. E. H. TAY ◽  
M. W. S. LAU ◽  
E. LOW ◽  
G. SEET
Keyword(s):  
Control System ◽  
System Design ◽  
Design Theory ◽  
Design Analysis ◽  
Design Concept ◽  
Pilot Training ◽  
Design Issues ◽  
Remotely Operated Vehicle ◽  
Axiomatic Design Theory ◽  
And Control

In this paper, the system design issues of the Propulsion and Control System of the ROV II are analyzed and addressed. The design concept, some of the upgraded features of the ROV II in comparison to ROV I and the unified pilot training and control system developed, will also be briefly discussed in this paper.

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