scholarly journals Formulas for Canister and Pipe Design in Underground Nuclear Emplacement

1974 ◽  
Vol 96 (2) ◽  
pp. 65-72
Author(s):  
A. Blake
Keyword(s):  
Structural Response ◽  
Complex Problem ◽  
Theory And Practice ◽  
Complex Environment ◽  
Soil Pressure ◽  
Collapse Pressure ◽  
Closed Form Solutions ◽  
Analysis And Design ◽  
Nuclear Tests ◽  
Axial Response

In this paper, pressure vessel theory and practice are applied to the analysis and design of long emplacement strings and canister hardware used in a complex environment of underground nuclear tests. Design formulas are given for the collapse pressure of canisters and piping under external soil pressure and for the axial response of gussetted flanges supported by the theoretical and experimental results. The paper is intended primarily as a practical treatment of a complex problem of structural response with the aid of user-oriented, closed-form solutions.

Analysis and design of thermo-mechanical interfaces

2012 ◽  
Vol 60 (2) ◽  
pp. 205-213
Author(s):  
K. Dems ◽  
Z. Mróz
Keyword(s):  
Optimality Conditions ◽  
Mechanical Loading ◽  
Material Properties ◽  
Structural Response ◽  
External Boundary ◽  
Mechanical Loads ◽  
Internal Interface ◽  
Analysis And Design ◽  
First Order ◽  
Mechanical Nature

Abstract. An elastic structure subjected to thermal and mechanical loading with prescribed external boundary and varying internal interface is considered. The different thermal and mechanical nature of this interface is discussed, since the interface form and its properties affect strongly the structural response. The first-order sensitivities of an arbitrary thermal and mechanical behavioral functional with respect to shape and material properties of the interface are derived using the direct or adjoint approaches. Next the relevant optimality conditions are formulated. Some examples illustrate the applicability of proposed approach to control the structural response due to applied thermal and mechanical loads.

Engaged scholarship: Questioning relevance and impact in contemporary entrepreneurship/small and medium-sized enterprise research

2018 ◽  
Vol 36 (4) ◽  
pp. 363-367 ◽  
Author(s):  
Kiran Trehan ◽  
David Higgins ◽  
Ossie Jones
Keyword(s):  
Significant Contribution ◽  
Complex Problem ◽  
Theory And Practice ◽  
Mutual Understanding ◽  
Engaged Scholarship ◽  
Special Issue ◽  
The World

The aim of this Special Issue is to make a significant contribution to understanding the theory and practice of engaged scholarship; by engaged scholarship we mean ‘collaborative form of inquiry in which academics and practitioners leverage their different perspectives and competencies to coproduce knowledge about a complex problem or phenomenon that exists under conditions of uncertainty found in the world’. Such a definition draws attention towards the co-constructed nature of knowledge which has relevance by creating space for interaction between the academic and practitioner, creating the opportunity for knowledge and understanding to be co-created and enacted into practice. This space facilitates the ability to question one another and gain mutual understanding by directly bringing together methods of inquiry and practice.

Vibration Protection of Historical Buildings Located near the Lines of Urban Rail Transport

2019 ◽  
Vol 945 ◽  
pp. 318-324
Author(s):  
Vladimir Smirnov
Keyword(s):  
Vibration Isolation ◽  
System Analysis ◽  
Design Procedure ◽  
Ground Surface ◽  
Field Measurements ◽  
Railway Track ◽  
Soil Pressure ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Analysis And Design

Besides the underground, the second common type of public transport is the tram. Tram lines in Moscow city center, as well as in other cities in Russia, are being renovated and reconstructed. Vibration of the railway track travels through the ground to the foundation of buildings adjacent to tram lines, causing high vibration and structure-borne noise levels inside them. The article presents result of a vibration isolation system analysis and design for a building, located in 37m of the two-lanes tram line. Prior to design procedure, field measurements were made and vibration levels inside the building were recorded. The vibration isolation system design included calculation of soil pressure on the isolation pad and subsequent estimation of the elastomeric pad dynamic modulus. Using this data, the eigenfrequecny of vibration isolation system was derived and its efficiency calculated. After the system maintenance, measurements were made to check the system’s performance. During the measurements acceleration of isolated part of the building and the ground surface were synchronously measured and transfer function derived.

Gaseous Deflagration in Piping: Part 1 — Experimental Observations

2017 ◽  
Author(s):  
Thomas C. Ligon ◽  
David J. Gross ◽  
John C. Minichiello
Keyword(s):  
High Speed ◽  
Structural Response ◽  
Analysis And Design ◽  
Flame Acceleration ◽  
Pressure Time ◽  
Piping Systems ◽  
Time Histories ◽  
Short Test ◽  
Semi Empirical ◽  
Measured Pressure

The focus of this paper is on gaseous deflagration in piping systems and the corresponding implications on piping analysis and design. Unlike stable detonations that propagate at a constant speed and whose pressure-time histories can in some cases be predicted analytically, deflagration flame speeds and pressure-time histories are transient and depend on both the gas mixture and geometry of the pipe. This paper presents pressure and pipe strain data from gaseous deflagration experiments in long and short test apparatuses fabricated from either 2-inch or 4-inch diameter pipes. These data are used to demonstrate a spectrum of measured pressure-time histories and corresponding pipe response. It is concluded that deflagrations can be categorized as either “high” or “slow” speed with respect to pipe response. Slow deflagrations can be treated as quasi-static pressurizations, but high speed deflagrations can generate shock waves that dynamically excite the pipe. The existence of a transition from quasi-static to dynamic response has ramifications in regards to piping structural analysis and design, and a method for predicting the expected deflagration structural response using a semi-empirical flame acceleration model is proposed.

General inverse solution of six-degrees-of-freedom serial robots based on the product of exponentials model

2018 ◽  
Vol 38 (3) ◽  
pp. 361-367 ◽  
Author(s):  
Haixia Wang ◽  
Xiao Lu ◽  
Wei Cui ◽  
Zhiguo Zhang ◽  
Yuxia Li ◽  
...  
Keyword(s):  
Design Methodology ◽  
Degrees Of Freedom ◽  
Screw Theory ◽  
Complex Problem ◽  
Content Type ◽  
Geometrical Properties ◽  
Closed Form Solutions ◽  
Six Degrees Of Freedom ◽  
Serial Robots ◽  
Six Dof

Purpose Developing general closed-form solutions for six-degrees-of-freedom (DOF) serial robots is a significant challenge. This paper thus aims to present a general solution for six-DOF robots based on the product of exponentials model, which adapts to a class of robots satisfying the Pieper criterion with two parallel or intersecting axes among its first three axes. Design/methodology/approach The proposed solution can be represented as uniform expressions by using geometrical properties and a modified Paden–Kahan sub-problem, which mainly adopts the screw theory. Findings A simulation and experiments validated the correctness and effectiveness of the proposed method (general resolution for six-DOF robots based on the product of exponentials model). Originality/value The Rodrigues rotation formula is additionally used to turn the complex problem into a solvable trigonometric function and uniformly express six solutions using two formulas.

scholarly journals Vibration Control Devices for Building Structures and Installation Approach: A Review

2019 ◽  
Vol 29 (2) ◽  
pp. 74-100 ◽  
Author(s):  
Waseem Sarwar ◽  
Rehan Sarwar
Keyword(s):  
Energy Dissipation ◽  
Vibration Control ◽  
Passive Control ◽  
Search Algorithm ◽  
Structural Response ◽  
Building Structures ◽  
Analysis And Design ◽  
Control Devices ◽  
Energy Dissipation Devices ◽  
Energy Absorbing

Abstract Retrofit and structural design with vibration control devices have been proven repeatedly to be feasible seismic hazard mitigation approach. To control the structural response; supplemental energy dissipation devices have been most commonly used for energy absorption. The passive control system has been successfully incorporated in mid to high rise buildings as an appropriate energy absorbing system to suppress seismic and wind-induced excitation. The considerable theses that are highlighted include vibration control devices, the dynamic behavior of devices; energy dissipation mechanism, devices installation approach and building guidelines for structural analysis and design employing vibration control devices also, design concern that is specific to building with vibration control devices. The following four types of supplemental damping devices have been investigated in this review: metallic devices, friction devices, viscous fluid devices, and viscoelastic devices. Although numerous devices installation techniques available, more precisely, devices installation approaches have been reviewed in this paper, including Analysis and Redesign approach (Lavan A/R), standard placement approach, simplified sequential search algorithm, and Takewaki approach.

scholarly journals Response Quantities of Framed Buildings under Dynamic Excitation

2019 ◽  
Vol 8 (11) ◽  
pp. 3798-3804
Keyword(s):  
Seismic Analysis ◽  
Structural Response ◽  
Base Shear ◽  
Response Factors ◽  
Analysis And Design ◽  
Dynamic Excitation ◽  
Combination Methods ◽  
Time Period ◽  
Moment Resisting ◽  
Seismic Forces

Seismic analysis of structure is employed to make the structure enable to resist the seismic forces and perform against the factors causing the failure of the structure under dynamic excitation. Among various response factors, the base shear and time period of buildings are predominant factors used in the analysis and design of the structure. The prime objective of the paper is to present an analytical study on non-linear seismic analysis of moment resisting framed buildings (as per Indian code IS1893 – 2016) to evaluate the base shear of different configurations of buildings according to different mode combination methods. The obtained results have been presented the comparative analysis of different combination methods. The paper also presents the evaluated results in the form of the time period values of the different buildings depending upon variation in its configuration. As a result, the responses of multistoried moment-resisting framed buildings have been evaluated for various models of considered buildings based on different mode combination methods, and the results of obtained responses have been analyzed in a comparative manner to understand the behaviour of buildings under various methods and configuration conditions. The work presented in the paper can support to develop better understanding of structural response and efficient designing of structures.

Comparison of SCR Field Response With Analytical Predictions

2011 ◽  
Author(s):  
Yiannis Constantinides ◽  
Jen-hwa Chen ◽  
Lee Tran ◽  
Prahlad Enuganti ◽  
Mike Campbell
Keyword(s):  
Structural Response ◽  
Field Measurements ◽  
Design Parameters ◽  
Element Analysis ◽  
Steel Catenary Riser ◽  
Analysis And Design ◽  
Industry Standard ◽  
Fea Modeling ◽  
Actual Field ◽  
Deepwater Risers

Design of deepwater risers involves the use of multiple conservative design parameters to account for the uncertainty in the understanding of the behavior of complex structures. As the oil industry moves into deeper and harsher waters, the design tolerances are getting stretched. Chevron has been monitoring the structural response of a deepwater Gulf of Mexico steel catenary riser (SCR) to improve the understanding of riser behavior and to evaluate the existing analysis and design methodologies against actual field measurements. The following paper presents a selected set of results from benchmark of SCR response in storm conditions against analytical predictions, based on industry standard methodologies. The predictions are based on a finite element analysis (FEA) modeling of the riser structure with empirically formulated models for hydrodynamics and soil-structure interaction. Predicted riser response in terms of accelerations and stresses along the length are compared against field measurements showing good overall agreement.

A Practical Approach for Problem-Based Learning in Engineering

2007 ◽  
Author(s):  
Emily M. Hunt ◽  
Pamela Lockwood-Cooke ◽  
Paul Fisher
Keyword(s):  
Engineering Education ◽  
Real World ◽  
Engineering Students ◽  
Teaching Method ◽  
Problem Based Learning ◽  
Pilot Project ◽  
Complex Problem ◽  
Engineering Problem ◽  
Theory And Practice ◽  
Engineering Mathematics

Problem-based Learning (PBL) is a motivating, problem-centered teaching method with exciting potential in engineering education. PBL can be used in engineering education to bridge the gap between theory and practice in a gradual way. The most common problem encountered when attempting to integrate PBL into the undergraduate engineering classroom is the time requirement to complete a significant, useful problem. Because PBL has such potential in engineering, mathematics, and science education, professors from engineering, mathematics, and physics have joined together to solve small pieces of a large engineering problem concurrently in an effort to reduce the time required to solve a complex problem in any one class. This is a pilot project for a National Science Foundation (NSF) supported Science Talent Expansion Program (STEP) grant entitled Increasing Numbers, Connections, and Retention in Science and Engineering (INCRSE) (NSF 0622442). The students involved are undergraduate mechanical engineering students that are co-enrolled in Engineering Statics, Calculus II, and Engineering Physics I. These classes are linked using PBL to increase both student engagement and success. The problem addresses concepts taught in class, reinforces connections among the courses, and provides real-world applications. Student, faculty, and industry assessment of the problem reveals a mutually beneficial experience that provides a link for students between in-class concepts and real-world application. This method of problem-based learning provides a practical application that can be used in engineering curricula.

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