The Branching Redesign Technique Used for Upgrading Steel-Pipes-Based Hydraulic Systems: Re-Examined

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Mohamed Amir Chaker ◽  
Ali Triki
Keyword(s):  
Circumferential Stress ◽  
Radial Strain ◽  
Relevant Information ◽  
Hydraulic Head ◽  
Oscillation Period ◽  
Design Stage ◽  
Hydraulic Systems ◽  
Steel Pipes ◽  
Wave Oscillation ◽  
Numerical Solver

Abstract The branching technique demonstrated an effective ability to attenuate severe hydraulic-head magnitudes into existing steel-pipes-based hydraulic systems. However, there was no detailed exploration of circumferential-stress, radial-strain, and wave-oscillation period behaviors, which are equally embedded in the design stage of hydraulic systems. Accordingly, this paper examined these last parameters to provide relevant information on the entire design key parameters. The numerical solver used the Method of Characteristics for discretizing the extended one-dimensional water-hammer model incorporating the Vitkovsky and the Kelvin–Voigt formulations along with the discrete gas cavity model to represent column separation. The plastic short-penstock material types utilized in this study included high- or low-density polyethylene (HDPE or LDPE). Results demonstrated that the branching technique is promising in terms of hydraulic-head attenuation waves; however, this research emphasized the limitation of this technique, not previously delineated, including the amplification of the radial-strain peaks or crests and the spreading of the wave-oscillation period. Ultimately, a methodology was suggested for optimizing the plastic short-penstock diameter and length parameters.

Computer-Supported Innovation for Modularized Product Design

2011 ◽  
Vol 341-342 ◽  
pp. 586-590
Author(s):  
Ming Piao Tsai ◽  
Peter Iming Shieh ◽  
Chin Hui Chuang
Keyword(s):  
Problem Solving ◽  
Product Design ◽  
Rapid Development ◽  
Modular Function ◽  
Relevant Information ◽  
Design Stage ◽  
Prototype System ◽  
Case Based Reasoning ◽  
Knowledge Based ◽  
Use Of Knowledge

In the paper, a computer-supported model of the innovation design is presented, which is based on the synergy of modular function deployment (MFD), theory of inventive problem solving (TIPS, TRIZ) and case-based reasoning (CBR) to assist designer to engage in modularized product design. This approach involves gathering all relevant information about the customer voice and applying this information to drive the design of products or modules. So, it is starting from the MFD-Diagrams and continuing through the technical contradictions matrix in TRIZ during the conceptual design stage of new modules or parts. A CBR system is then adopted to quickly search some similar design cases for the references of inventive problem solving. Last, two reasoning mechanism are fabricated based on Protege and JESS expert tool, and a particular case of bicycle part design is studied through the use of knowledge-based prototype system to prove the effectiveness/efficiency of the computer-supported model. However, it will greatly enhance the competitive capability of companies trying to rapid development of the innovation design.

Exploring the performances of the dual technique-based water hammer redesign strategy in water supply systems

2019 ◽  
Vol 69 (1) ◽  
pp. 6-17 ◽  
Author(s):  
Mounir Trabelsi ◽  
Ali Triki
Keyword(s):  
Pressure Wave ◽  
Oscillation Period ◽  
Conventional Technique ◽  
Water Hammer ◽  
Water Supply Systems ◽  
Piping System ◽  
Wave Oscillation ◽  
Pressure Surge ◽  
Short Section ◽  
Steel Piping

Abstract This paper explored and compared the effectiveness of the inline and branching redesign strategies-based dual technique, implemented to enhance the conventional technique skills in terms of attenuation of positive and negative pressure surge magnitudes and limitation of the spreading of pressure wave oscillation period. Basically, this technique is based on splitting the single inline or branched plastic short-section, used in the conventional technique, into a couple of two sub-short-sections made of two distinct plastic material types. Investigations addressed positive and negative surge initiated water hammer events. Additionally, high and low density polyethylene materials were utilized for sub-short-section material. Results illustrated the reliability of the dual technique in protecting hydraulic systems from excessive pressure rise and drop, and evidenced that the (HDPE/LDPE) sub-short-sections' combination (where the former sub-short-section is attached to the sensitive region of the steel piping system parts, while the latter is attached to the second extremity of the steel piping system) is the most prominent configuration providing the best trade-off between pressure surge attenuation, and pressure wave oscillation period spreading. Lastly, it was found that the pressure head peak (or crest) and the pressure wave oscillation period values were markedly sensitive to the (HDPE) sub-short-section length and diameter.

scholarly journals Minimization of Stress State of a Hub of Friction Pair

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Vagif M. Mirsalimov ◽  
Parvana E. Akhundova
Keyword(s):  
Stress State ◽  
Friction Pair ◽  
Circumferential Stress ◽  
Design Stage ◽  
Friction Unit ◽  
Surface Model ◽  
Oil Well ◽  
Algebraic Equations ◽  
Minimax Criterion ◽  
External Contour

The function of displacements of external contour points of a friction pair hub that could provide minimization of stress state of a hub was determined on the basis of minimax criterion. The problem is to decrease stress state at that place where it is important. The rough friction surface model is used. To solve a problem of optimal design of friction unit the closed system of algebraic equations is constructed. Increase of serviceability of friction pair parts may be controlled by design-engineering methods, in particular by geometry of triboconjugation elements. Minimization of maximum circumferential stress on contact surface of friction unit is of great importance in the design stage for increasing the serviceability of friction pair. The obtained function of displacements of the hub’s external contour points provides the serviceability of friction pair elements. The calculation of friction pair for oil-well sucker-rod pumps is considered as an example.

scholarly journals Methodological approach for a sustainable management of water inflow and geothermal energy in tunnels

2015 ◽  
Vol 4 (3) ◽  
Author(s):  
Fabio Furno ◽  
Marco Barla ◽  
Antonio Dematteis ◽  
Stefano Lo Russo
Keyword(s):  
Geothermal Energy ◽  
Sustainable Management ◽  
Cold Water ◽  
Methodological Approach ◽  
Relevant Information ◽  
Water Inflow ◽  
Design Stage ◽  
Geothermal Resources ◽  
Tunnel Design

It is quite unusual to consider the exploitation of geothermal resources during at the tunnel design stage. This paper is intended to analyse the nature and the potential of the geothermal resources. These are essentially the hot or cold water inflow and the temperature of the surrounding ground itself. A methodological approach is proposed to face the problem, determine relevant information and estimate the attractiveness of the application. The approach is then applied to the case study of the metro line Dudullu-Bostanci in Istanbul, currently under design, by identifying a possible application of heat exchangers integrated into the tunnel lining and evaluating preliminarily the environmental and economical aspects.

scholarly journals Assessment of inline technique-based water hammer control strategy in water supply systems

2019 ◽  
Vol 68 (7) ◽  
pp. 562-572 ◽  
Author(s):  
Ridha Ben Iffa ◽  
Ali Triki
Keyword(s):  
Water Supply ◽  
Plastic Material ◽  
Pressure Head ◽  
Oscillation Period ◽  
Water Hammer ◽  
Steel Pipe ◽  
Water Supply Systems ◽  
Wave Oscillation ◽  
Supply Systems ◽  
Short Section

Abstract This article discusses and compares the effectiveness of the compound and dual technique-based inline strategy used to upgrade existing steel pipe-based water supply systems. Basically, these techniques are based on splitting the single inline short section, used in the conventional technique, into a couple of two sub-short sections made of two distinct plastic material types: high- and low-density polyethylene (HDPE) and (LDPE). The 1D unconventional water hammer solver based on the method of characteristics was used for numerical computations. Results evidenced that the specific setup of the compound technique based on (HDPE-LDPE) sub-short sections (where the former sub-short section is attached to the hydraulic parts, while the latter is attached to the main steel pipe) is the most prominent configuration providing an acceptable trade-off between attenuation of pressure head surge, and limitation of excessive wave oscillation period spreading. Furthermore, this compound technique setup allowed more important pressure head peak (or crest) attenuation as compared with the dual technique based on (LDPE-LDPE) sub-short sections; while inducing about similar values of wave oscillation period spreading.

Investigations on Wave Propagation of the Pressure Pulsation in a Helmholtz-Type Hydraulic Silencer With a Hemispherical Vessel

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Takayoshi Ichiyanagi ◽  
Tetsuya Kuribayashi ◽  
Takao Nishiumi
Keyword(s):  
Wave Propagation ◽  
Resonance Frequency ◽  
Pressure Pulsation ◽  
Lumped Parameter Model ◽  
Design Stage ◽  
Hydraulic Systems ◽  
Lumped Parameter ◽  
Reasonable Cost ◽  
Attenuation Characteristics ◽  
Step Section

The Helmholtz-type hydraulic silencer is one of the most practical silencers for attenuating pressure pulsations in hydraulic systems owing to its simple structure and reasonable cost. Maximum attenuation performance can be attained at the resonance frequency in accordance with the principle of Helmholtz resonance. Therefore, it is extremely important to precisely determine the resonance frequency at the design stage. It was clarified in our previous study that the shape of the volume vessel affects the resonance frequency of the silencer because of the wave propagation of pressure pulsation inside the volume vessel. In this study, the attenuation characteristics and wave propagation in a silencer with a hemispherical vessel are investigated. A mathematical model that takes into account the propagation of a one-dimensional wave in the radial direction of the hemispherical vessel is proposed and compared with the step section approximation model and the classic lumped parameter model. Furthermore, the effectiveness of the theoretical analysis is verified by experiments wherein the dimensional specifications of the vessel and neck are adjusted.

scholarly journals The Effect of Internal Pressure on Radial Strain of Steel Pipe Subjected to Monotonic and Cyclic Loading

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2849 ◽  
Author(s):  
Costel Pleșcan ◽  
Mariana D. Stanciu ◽  
Matyas Szasz
Keyword(s):  
Finite Element Method ◽  
Internal Pressure ◽  
Failure Modes ◽  
Radial Strain ◽  
The Finite Element Method ◽  
Steel Pipes ◽  
Environmental Disasters ◽  
Plastic Domain ◽  
Stress States ◽  
Hardening Of Materials

Steel pipes in different engineering applications may fail, leading to numerous environmental disasters. During loading, certain mechanical and chemical phenomena develop inside the pipes and cause them to burst. In this study, the influence of internal pressure on the elastic and plastic behaviour of E355 steel pipes was investigated on small specimens with different wall thicknesses. First, the failure modes of pipes subjected to monotonic loading were assessed, and then the behaviour of specimens subjected to cyclic internal pressure was analysed in terms of variation of radial strain. The strain and stress states of pipes were analysed using the finite element method. The results revealed that the hardening of materials inside the pipes increases the risk of cracking and bursting because of elasticity limits being exceeded, causing entry into the plastic domain. The transition of mechanical behaviour can be observed in the microstructure of steel in cracked areas from the inside to the outside of the pipe.

COMPARATIVE STUDIES OF TRIBOLOGICAL PROPERTIES OF SELECTED POLYMER RESINS FOR USE IN HYDRAULIC SYSTEMS

Tribologia ◽  
2019 ◽  
Vol 288 (6) ◽  
pp. 31-37 ◽  
Author(s):  
Marek Lubecki ◽  
Michał Stosiak ◽  
Tadeusz Leśniewski
Keyword(s):  
Composite Materials ◽  
Tribological Properties ◽  
Comparative Studies ◽  
Optical Microscope ◽  
Design Stage ◽  
Operating Parameters ◽  
Hydraulic Systems ◽  
Hydraulic Cylinders ◽  
Disk Method ◽  
Composite Cylinders

The use of composite materials in the construction of hydraulic cylinders allows for a significant reduction in the weight of the element while maintaining its operating parameters. One of the issues to be solved at the design stage is to ensure the tightness of the cylinder and the correct cooperation of the cylinder with the piston. Four materials that can be used as internal coatings in such composite cylinders were selected in the work. Preliminary tests using the ball-on-disk method and observation of signs of wear were carried out using an optical microscope and SEM. After testing, materials for further studies were selected.

A Novel Approach for Pipe Grade Determination Through In-Line Inspection (ILI)

2014 ◽  
Author(s):  
Daniel Molenda ◽  
Werner Thale
Keyword(s):  
Yield Strength ◽  
Pipeline Steel ◽  
Relevant Information ◽  
Tensile Tests ◽  
Operating Pressure ◽  
Steel Pipes ◽  
Novel Approach ◽  
Laboratory Test Results ◽  
First Results ◽  
Pull Tests

When establishing a pipelines’ maximum allowable operating pressure (MAOP), many pipeline operators face uncertainties regarding the yield strength of the respective pipeline material. This specifically concerns “pre-regulatory” pipelines which, for example, constitute approximately 66% of all gas transmission pipelines in the U.S. as well as new pipelines to ensure laid steel pipes meet the contracted steel grade. Conventional ILI technologies are capable of delivering relevant information for MAOP calculation, such as wall thickness and diameter. However, as missing element, in the past there have been no economic means for accurately measuring yield strength. Therefore ROSEN has developed and tested a novel ILI system for measuring yield strength of pipeline steel. This paper introduces the fundamental principles of this new system and outlines first results. Laboratory test results are obtained from samples covering the typical range of pipeline steels. The sensor readings are correlated with reference yield strengths of certified steels where the yield strength was determined by destructive tensile tests. Initial pull tests with an ILI tool measurement are compared with the available yield strengths and tensile strengths according to the inspection certificates of the pull test pipes.

Automated Fault Tree Analysis for Hydraulic Systems

1996 ◽  
Vol 118 (2) ◽  
pp. 278-282 ◽  
Author(s):  
P. A. Hogan ◽  
C. R. Burrows ◽  
K. A. Edge ◽  
R. M. Atkinson ◽  
M. R. Montakhab ◽  
...  
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Design Stage ◽  
Engineering Systems ◽  
Hydraulic Systems ◽  
Tree Analysis ◽  
Qualitative Component ◽  
Analysis Of Failures ◽  
And Performance ◽  
Component Models

Fault Tree Analysis is a commonly used technique for assessing the reliability and safety of engineering systems at the design stage but it is tedious and time-consuming to apply. A reconfigurable program is presented which utilizes a library of qualitative component models to enable fault tree type analyses of arbitrary hydraulic circuit configurations. It is applied to the analysis of failures of an experimental rig and a complex industrial system, and some features of its design and performance are discussed.

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