A Multiobjective Optimization Strategy with Priority Ranking of the Design Objectives

1993 ◽  
Vol 115 (4) ◽  
pp. 784-792 ◽  
Author(s):  
M. Matsumoto ◽  
J. Abe ◽  
M. Yoshimura
Keyword(s):  
Structural Design ◽  
Torsional Rigidity ◽  
The Other ◽  
Optimization Strategy ◽  
Design Requirement ◽  
Response Level ◽  
Lower Priority ◽  
Priority Ranking ◽  
Priority Order ◽  
Motorcycle Frame

Generally, two types of priorities are considered among multiple objectives in the design of machine structures. One of these objectives is named the “hard objective” and is the absolutely indispensable design requirement while the other is called “soft objective” and has a lower priority order. This paper proposes a multiobjective structural optimization strategy with priority ranking of the design objectives. Further, this strategy is demonstrated on the actual example of a motorcycle frame structural design which has three design objectives: (1) an increase in static torsional rigidity, (2) a reduction of dynamic response level, and (3) a decrease in the weight of the motorcycle frame.

A Multi-Objective Optimization Strategy With Priority Ranking of the Design Objectives

1990 ◽  
Author(s):  
Masahide Matsumoto ◽  
Jumpei Abe ◽  
Masataka Yoshimura
Keyword(s):  
Structural Design ◽  
Torsional Rigidity ◽  
Optimization Strategy ◽  
Multi Objective Optimization ◽  
Response Level ◽  
Multi Objective ◽  
Lower Priority ◽  
Priority Ranking ◽  
Priority Order ◽  
Motorcycle Frame

Abstract Generally, two types of priorities are considered among multiple objectives in the design of machine structures. One of these objectives is named the “hard objective”, which is the absolutely indispensable design requirement. The other is called the “soft objective”, which has lower priority order. This paper proposes a multi-objective structural optimization strategy with priority ranking of those design objectives. Further, this strategy is demonstrated on the actual example of a motorcycle frame structural design which has three design objectives, (1) an increase in static torsional rigidity, (2) a reduction of dynamic response level, and (3) a decrease in the weight of the motorcycle frame.

scholarly journals No-go trials in task switching: effects on the task-set and task-space level

2021 ◽  
Author(s):  
Juliane Scheil ◽  
Thomas Kleinsorge
Keyword(s):  
Task Switching ◽  
The Other ◽  
Specific Task ◽  
Task Space ◽  
Response Level ◽  
Task Set ◽  
Common Marker ◽  
Task Sets ◽  
And Task

AbstractA common marker for inhibition processes in task switching are n − 2 repetition costs. The present study aimed at elucidating effects of no-go trials on n − 2 repetition costs. In contrast to the previous studies, no-go trials were associated with only one of the three tasks in the present two experiments. High n − 2 repetition costs occurred if the no-go task had to be executed in trial n − 2, irrespective of whether a response had to be withheld or not. In contrast, no n − 2 repetition costs were visible if the other two tasks were relevant in n − 2. Whereas this n − 2 effect was unaffected by whether participants could reliably exclude a no-go trial or not, effects of no-gos in trial n were determined by this knowledge. The results differ from effects of no-go trials that are not bound to a specific task. It is assumed that the present no-go variation exerted its effect not on the response level, but on the level of task sets, resulting in enhanced salience of the no-go task that leads to higher activation and, as a consequence, to stronger inhibition. The dissociation of the effects on no-gos in trials n − 2 and n as a function of foreknowledge suggests that the balance between activation and inhibition is shifted not only for single trials and tasks, but for the whole task space.

Study on Wear-Preventing of Needle Valve in Fuel Injection System Mounted on DME Engine

2011 ◽  
Vol 228-229 ◽  
pp. 1057-1062
Author(s):  
Xin Rong Wen ◽  
Guang De Zhang ◽  
Wei Hua Wang ◽  
Xie Lu ◽  
Sun Jing
Keyword(s):  
Dynamic Stability ◽  
Structural Design ◽  
Fuel Injection ◽  
Dynamic Instability ◽  
Calculation Model ◽  
The Other ◽  
Injection System ◽  
Needle Valve ◽  
Fuel Injection System ◽  
Theoretical Support

The purpose of this paper is to provide theoretical support for the structural design to prevent the wear of needle. The actual wear of the orientation part of the needle in scrapped needles was researched. The presented results showed that the main reason to the wear of the orientation part of needle was the dynamic instability and the abrasives enter into the surface of orientation part which increases the wear, and that the calculation model of dynamic stability was proposed to prevent the wear of needle. This model was a pressure rod, one end of which was fixed, the other was free, and the two ends were pressed on axial force which changes with time. Besides, the classic formula of dynamic stability of pressure rod was changed rationally, so as to correspond with the calculation model. It will play a part in preventing the wear of needle.

EERI Distinguished Lecture 1997 Professional Commitments to Earthquake Engineering

1998 ◽  
Vol 14 (4) ◽  
pp. 651-657
Author(s):  
Thomas Paulay
Keyword(s):  
Seismic Design ◽  
Earthquake Engineering ◽  
Structural Design ◽  
Design Strategy ◽  
The Other ◽  
High Quality ◽  
Generous Support ◽  
The One ◽  
Creative Effort ◽  
Quality Construction

Philosophical concepts, biased toward structural design in seismic regions, are offered. Certain misconceptions in the aims, planning and execution of structural design are sketched. Apparent diverging professional interests, motivating on the one hand young academics dedicated to pursuing challenges in research, and on the other hand those of experienced practitioners, are contrasted. A plea is made to use in seismic design rationality and simplicity in application. The primary aim in the art of structural design should be to impart to the system specific properties that will make the seismic response of our buildings extremely tolerant with respect to earthquake-induced demands, which presently we can predict only with considerable crudeness. A postulated rational and deterministic, yet simple, design strategy should be implemented with equal dedication to high-quality construction. This part of the creative effort is likely to result in properties of the finished product, our buildings, which earthquakes will also recognize and respect. An appeal is made to all those committed to earthquake engineering to engage in active and generous support of technology transfer in an attempt to alleviate the overwhelming and immediate needs of societies in developing countries.

Elastic Instability of a Stringer on Thin Sheets

1962 ◽  
Vol 66 (620) ◽  
pp. 530-531
Author(s):  
J. B. Caldwell
Keyword(s):  
Structural Design ◽  
Diffusion Problem ◽  
The Other ◽  
Elastic Instability ◽  
Thin Sheets ◽  
Aircraft Structures

Figure 1 illustrates a load diffusion problem which occurs in ship structural design, and which may also be relevant to aircraft structures. A load applied to one end of a stringer is diffused into the attached sheet and eventually reacted by shearing forces at the longitudinal edges. The transverse edges of the sheet and the other end of the stringer are not loaded.Various methods, which differ in their assumptions regarding stresses and displacements in the sheet, are available for tackling this problem. For calculating the distribution of load or stress in the stringer it makes little difference which method is used. The “finite stringer” method of reference (1) is the simplest and should be sufficiently accurate for most cases.

Structural Design and Analysis of the Motionlink in the Dynamic Assembled Screw-Driven Device

2013 ◽  
Vol 376 ◽  
pp. 390-394
Author(s):  
Yi Fei Feng ◽  
Xiao Jun Xu ◽  
Hai Jun Xu ◽  
Xiang Zhang ◽  
Fa Liang Zhou ◽  
...  
Keyword(s):  
Mechanical Characteristic ◽  
Structural Design ◽  
Simulation Analysis ◽  
The Other ◽  
The Right

The dynamic assembled screw-driven device is a new kind of mechanical driving device, one of its main structures is the reasonable designed motionlink. To setup two groups of oriented wheels which complied the Archimedes screw around the center cylinder, the top groups of wheels ensure the helical plates moving in the right direction otherwise be twisted, and the other groups of wheels provide the power that ensure the helical plates meshed accurately and driving stably. This paper is to calculate the structure in theory and make some primary simulation analysis for the mechanical characteristic in Static.

Research on Mixed Vitality of Historic District and Space Mode Optimization: A Comparison between Hefang Street and Xinyifang in Hangzhou

2013 ◽  
Vol 357-360 ◽  
pp. 1724-1729
Author(s):  
Xiao Qing Zhu ◽  
Jiao Jiao Sun ◽  
Jia Yan Fu
Keyword(s):  
Characteristic Function ◽  
Public Space ◽  
The Other ◽  
Historic District ◽  
Optimization Strategy ◽  
Urban Context ◽  
Cultural Characteristics ◽  
Historic Districts ◽  
The One ◽  
Pedestrian Street

Historic district is a main carrier of urban context. So from the perspective of mixed organization of public space, on the one hand, this paper analyzes the space features and mechanism of commercial pedestrian street by comparing Hefang Street with Xinyifang, these two representative historic districts in Hangzhou, in three aspects of location characteristic, function composition and space mode; on the other hand, with the investigation and analysis of users demand and satisfaction, this paper explores characteristics of using mixed vitality in optimizing the space mode of commercial pedestrian street of Hangzhou historic district. Finally, the space mode optimization strategy on regional characteristics is provided to further improve Hangzhou historical and cultural characteristics and public space vitality.

Response Characteristics of Piping System Supported by Visco-Elastic and Elasto-Plastic Dampers

1990 ◽  
Vol 112 (1) ◽  
pp. 34-38 ◽  
Author(s):  
T. Chiba ◽  
H. Kobayashi
Keyword(s):  
Energy Dissipation ◽  
Seismic Design ◽  
Damping Ratio ◽  
The Other ◽  
Piping System ◽  
Response Level ◽  
Response Characteristics ◽  
Damping Effect ◽  
Component Test ◽  
Piping Systems

Improving the reliability of the piping systems can be achieved by eliminating the mechanical snubber and by reducing the response of the piping. In the seismic design of piping system, damping is one of the important parameters to reduce the seismic response. It is reported that the energy dissipation at piping supports contributes to increasing the damping ratio of piping system. Visco-elastic damper (VED) and elasto-plastic damper (EPD) were developed as more reliable, high-damping piping supports. The dynamic characteristics of these dampers were studied by the component test and the full-scale piping model test. Damping effect of VED is independent of the piping response and VED can be modeled as a complex spring in the dynamic analysis. On the other hand, damping ratio of piping system supported by EPD increases with the piping response level. So, these dampers are helpful to increase the damping ratio and to reduce the dynamic response of piping system.

Effects of Fibres on Improvement the Cracking in Concrete Slabs

2014 ◽  
Vol 1025-1026 ◽  
pp. 997-1004
Author(s):  
Arton Dautaj ◽  
Naser Kabashi ◽  
Cene Krasniqi ◽  
Patriot Ahmeti
Keyword(s):  
Structural Design ◽  
Composite Structures ◽  
Concrete Slab ◽  
Concrete Slabs ◽  
Design Requirement ◽  
Polypropylene Fibres ◽  
Hardening Process ◽  
Traditional Definition ◽  
Definition Of ◽  
Concrete Elements

The behaviour of concrete elements under loads, hydrated process and several conditions is one of the actually problems on improvement of structures or elements of structures. In this paper we analyze the problem of cracking, such a result of loading and hardening process of concrete. One of the way for improvement is using the polypropylene fibres , and creating the composite materials In this case of studies we used experimental examinations of concrete slab, such a model, for - slab (referent model) - slab with different percent of fibres The most of comparing results are on comparing the effect of fibres in improvement of energy capacity of concrete elements, and following the crack situation, or decreasing the dimensions of cracks. One of the most important value based on the behavior of the structure is ductility. The ductility is a structural design requirement in most design codes. The traditional definition of ductility cannot be applied to composite structures, but will be analyzed on the increasing the dissipations of energy. Several methods are used on the analyzing of this problem and propose to calculate the absorption the energy in concrete slab and to analyze the positions of cracks.

scholarly journals Symbols of the songs by Leela Benare in Vijay Tendulkar’s play Silence! The court is in session

2021 ◽  
Vol 9 (7) ◽  
pp. 77-84
Author(s):  
Ramen Goswami Sirjii
Keyword(s):  
Structural Design ◽  
The Other ◽  
Psychic Life ◽  
Mock Trial ◽  
Independent Life ◽  
The Right

The current study explores and sheds light on the trials and tribulations of an independent Women, Miss. Leela Benare, in Vijay Tendulkar’s play Silence! The Court is in session. Here Tendulkar dwells on gender Discriminations. Till the commencement of the mock- trial, Benare is the most cheerful, talkative Character. She makes comments on her own independent life, on the behaviour of her fellow actors, she Sings and shows her vitality and assertiveness even in the second act when the mock trial with her as the Accused begins. In this context her songs are relevant to the structural design of the play as well as these Highlight the mental agony and pangs of a deep rooted mother. In Silence! The Court is in Session, though the dialogues of the characters are set in unvarnished prosaic terms, four songs and one poem have been used in order to add lyrical flavour to unvarnished language of reality. Tendulkar has these songs sung by Benare, the protagonist of the play, not by other characters. A song is no doubt a lyric that expresses a set of emotion, feeling and ideas and thereby exposes the psychic life of the speaker. The four songs in the play, of which two are derivative and the other two are composed by the dramatist, are set in Benare’s mouth in order to equip the woman with the right to narrate her life in lyrical terms.

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