A Portable Structural Analysis Library for Reaction Networks

Mapping Intimacies ◽

10.1101/245068 ◽

2018 ◽

Author(s):

Yosef Bedaso ◽

Frank T. Bergmann ◽

Kiri Choi ◽

Herbert M. Sauro

Keyword(s):

Structural Analysis ◽

Network Flows ◽

Reaction Network ◽

Simulation Software ◽

Dynamical Analysis ◽

Robust Algorithms ◽

System A ◽

Portable Software ◽

Elementary Modes ◽

Concentration Changes

AbstractThe topology of a reaction network can have a significant influence on the network’s dynamical properties. Such influences can include constraints on network flows and concentration changes or more insidiously result in the emergence of feedback loops. These effects are due entirely to mass constraints imposed by the network configuration and are important considerations before any dynamical analysis is made. Most established simulation software tools usually carry out some kind of structural analysis of a network before any attempt is made at dynamic simulation. In this paper we describe a portable software library, libStructural, that can carry out a variety of popular structural analyses that includes conservation analysis, flux dependency analysis and enumerating elementary modes. The library employs robust algorithms that allow it to be used on large networks with more than a two thousand nodes. The library accepts either a raw or fully labeled stoichiometry matrix or models written in SBML format. The software is written in standard C/C++ and comes with documentation and a test suite. The software is available for Windows, Mac OS X, and can be compiled easily on any Linux operating system. A language binding for Python is also available through the pip package manager making it trivial to install on any standard Python distribution. As a second example, we also create a new libStructural plugin for PathwayDesigner that allows solutions to be viewed graphically. The source code is licensed under the open source BSD license and is available on GitHub (https://github.com/sys-bio/Libstructural)

Download Full-text

Numerical Simulation on Reinforced Concrete Beam with Different Cover Size under Two Point Bending Load

International Journal for Modern Trends in Science and Technology - RTT2020 ◽

10.46501/ijmtst0705005 ◽

2021 ◽

Vol 7 (05) ◽

pp. 39-43

Author(s):

R Padma Rani & R Harshani

Keyword(s):

Finite Element ◽

Reinforced Concrete ◽

Structural Analysis ◽

Concrete Beam ◽

Failure Modes ◽

Equivalent Stress ◽

Reinforced Concrete Beam ◽

Simulation Software ◽

Beam Specimen ◽

Bending Load

Structural analysis is used to assess the behavior of engineering structures under the application of loads. Usually, structural analysis methods include analytical,experimental and numerical methods is used in thisproject, however, only Analytical method is used and the values are taken from literature reference, to get familiar with Finite Element Analysis (FEA) using ANSYS, this is done to acquire practical knowledge about of the effect of the cover. The aim is to identify different failure modes under a range of loading conditions by changing the cover size to get the data of various parameters such as deflection, stress etc. Study of cover helps to observe the stability, reliability and the overall strength of the structural beam. This project attempts made to study the effect of cover on the behavior of reinforced concrete beam. Forthis analytical study, the Reinforced concrete beam specimen of 2000x100x200mm was considered.ANSYS software is a suite of engineering simulation software, based on finite element method, which can solve problems ranging from linear analysis to nonlinear analysis. The Doubly reinforced beams weremodeled by using geometry. In this model,various covers are provided. The beam specimensused in this study were tested under two-point static loading condition until failure of the specimen. From theobtained resultconcluded that the total deformation and directional deformation values are low in 25mm cover compared to other cases but the equivalent stress value is low in 35mm cover size compared to 25mm cover size.

Download Full-text

Analysis of alternative ventilation strategies for existing multi-family buildings using CONTAM simulation software

E3S Web of Conferences ◽

10.1051/e3sconf/202017209004 ◽

2020 ◽

Vol 172 ◽

pp. 09004

Author(s):

Xinxiu Tian ◽

Jamie Fine ◽

Marianne Touchie

Keyword(s):

Ventilation System ◽

Poor Performance ◽

Simulation Software ◽

Base Case ◽

Building Model ◽

System A ◽

Airflow Distribution ◽

Air Ventilation ◽

Ventilation Strategies ◽

Post War

In many existing high-rise multi-family buildings, a pressurized corridor ventilation system is used to meet outdoor air ventilation requirements. However, this system often has poor performance, leading to under- or over- ventilation in different parts of a building. This study examines three ventilation strategies including: the base case, which is a traditional pressurized corridor ventilation system, a direct-to-suite ducted ventilation system, and a suite-based HRV ventilation system. A building model was constructed in CONTAM using features of a typical post-war multi-family building in Toronto, Canada. All three strategies were simulated using CONTAM under both summer and winter conditions. The resulting outdoor airflow delivery rates to the suites and corridor pressure differentials were compared to assess the effectiveness of each strategy. The results show that the suite-based HRV strategy is able to provide adequate ventilation airflow to individual suites in both summer and winter. In the traditional pressurized corridor system and the direct-to-suite ducting system, the airflows delivered to the suites located at the top of the building are higher than those delivered to the suites located at the bottom of the building. This uneven airflow distribution is more pronounced in winter when stack effect impacts the ventilation system more significantly.

Download Full-text

Evaluation of Joint Driving Torque and Finite Element Analysis in Articulate Robot through the simulation of Multi-Body Dynamics

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.k1725.0981119 ◽

2019 ◽

Vol 8 (11) ◽

pp. 682-686

Keyword(s):

Experimental Data ◽

Structural Analysis ◽

Dynamic Characteristics ◽

High Speed ◽

Simulation Software ◽

Analysis Software ◽

Characteristic Analysis ◽

Element Analysis ◽

Articulated Robots ◽

Multi Body

Interest in high-speed articulated robots is increasing for product productivity expansion. High-speed articulated robots operate with rapid acceleration/deceleration moves, requiring dynamic characteristic analysis in the robot designing process. For this dynamic behavior analysis, simulation software is utilized, which supports product design verification and parts optimization. In analyzing the dynamic characteristics using the software, loading conditions can be obtained from experimental data or parts’ material characteristics. In a special case where data or experimental data on load conditions are hardly obtainable, multibody dynamics software is utilized. However, it is not easy to define an effective load and boundary conditions for systems with kinetically complicated connections. In order to solve such a problem, this present study investigated how to apply to structural analysis software the dynamic load found using dynamics and structural analysis software. In addition, the dynamic characteristics of high-speed articulated robots and robot link were assumed as a rigid body in implementing the dynamics analysis and structural analysis.

Download Full-text

Understanding conductivity and soda loss

TAPPI Journal ◽

10.32964/tj16.2.65 ◽

2017 ◽

Vol 16 (02) ◽

pp. 65-75 ◽

Cited By ~ 2

Author(s):

Michael Brown ◽

Peter W. Hart

Keyword(s):

Flow Control ◽

Black Liquor ◽

Sodium Content ◽

Conductivity Measurements ◽

Dilution Factor ◽

System A ◽

Concentration Changes ◽

Last Stage ◽

Inline Measurement ◽

Expected Outcomes

For more than 40 years, conductivity has been the inline measurement of choice for inferring black liquor/soda losses from brownstock washing. If properly applied, conductivity can provide a benefit in tracking changes in black liquor filtrate concentration. The implied concentration changes in turn can be used to provide feedback for dilution factor or shower flow control on the last stage of a brownstock washing system. A further extrapolation of this application is the correlation (or lack of correlation) of conductivity to soda loss. For each type of conductivity-based application, there are fundamental principles and assumptions that must be understood and managed to achieve the expected outcomes. The fundamentals of conductivity, the application of conductivity to measure black liquor losses during brownstock washing, and laboratory considerations when attempting to correlate inline process conductivity to absolute sodium content are reviewed and investigated. Finally, the operational objectives and measurement alternatives for employing conductivity measurements are discussed.

Download Full-text

ABSORBER PERFORMANCE IMPROVEMENT THROUGH SOLVENT CONCENTRATION CHANGES TO REGULATE EMISSIONS FROM COMBUSTION SYSTEMS

African Journal of Engineering and Environment Research ◽

10.37703/ajoeer.org.ng/q2-2020/008 ◽

2020 ◽

Vol 1 (2) ◽

Keyword(s):

Removal Rate ◽

Combustion Products ◽

Reaction Scheme ◽

Simulation Software ◽

Evaluation Tool ◽

Solvent Concentration ◽

Complete Combustion ◽

Aspen Hysys ◽

Concentration Changes

This work highlighted the determination of the best concentration profile for the operation of an absorber with potential to cut down combustion products emissions from the complete combustion reaction scheme of a combustion system waste stream. The proposed solvent concentration had a range of 1.84%-2.20% of caustic entrainment, therefore further increase on the solvent concentration above 2.20% is not feasible. Incremental changes of 0.06% were made to assess the optimal concentration required for best absorber performance. A process simulation software, ASPEN HYSYS 8.6, was utilized to simulate the emissions profile with PENG-ROBINSON as the Vapour-Liquid Equilibrium evaluation tool in the software. The study found the performance of the absorber improved with a corresponding increase in the concentration with 2.20% giving the most efficient removal rate of 61.59%, 26.5% and 85.2% for SO2, CO2 and NO2, respectively. The study recommended that one veritable method of improving the performance of absorber systems is to increase the concentration of the alkali based solvent to cut down on emissions from flue gas systems.

Download Full-text

Methodology for First Coiled Tubing Application in a Problematic Unconventional Well with Proven 17,500 Psi Bottom Hole Pressure

10.2118/202116-ms ◽

2021 ◽

Author(s):

Mehdi Valiyev ◽

Hajagha Mammadov ◽

Pedro Correa ◽

Richard Reid

Keyword(s):

Structural Analysis ◽

Action Plan ◽

Simulation Software ◽

Reservoir Pressure ◽

Gas Reservoir ◽

Unsuccessful Attempt ◽

Planning Stage ◽

Coiled Tubing ◽

Well Integrity ◽

Well Conditioning

Abstract A deviated newly drilled gas well in Western Caspian Sea in Azerbaijan, with a flowing water reservoir pressure of 17,500-psi and a flowing gas reservoir pressure of 12,200-psi was unable to regain flow after an unsuccessful attempt to bullhead produced water back into the well. During the bullheading operation, there was a peak registered pumping pressure of 12,933-psi without admission of fluid into formation. Producing interval was 5880mTVD with a MASP of 9,700-psi for gas reservoir. Coiled Tubing was the most viable option to identify the problem, to solve it and to regain access to the lower completion and then proceed with interval abandonment program. This being an unconventional well in multiple aspects, presented serious challenges accentuated in Safety, Well Integrity Control, Obstruction Removal, and Well Conditioning Plan Forward. Integrity of completion was believed to be compromised by the high pumping pressures applied during bullheading and a confirmed communication between production tubing and "A annulus". After performing 2 rig site visits, an action plan was issued to adjust the platform for a Coiled Tubing intervention for the first time. Points to be developed in the plan were HSE, Structural Analysis and modifications required for proper equipment accommodation. For well integrity control, it was imperative to evaluate the potential scenarios which could have led to the problematic well status. Completion history and specifications were reviewed to assure each of the potential operating scenarios could be controlled without compromising well integrity. On obstruction removal, simulation software was used to design procedure with optimum string, chemicals, rates and fluids to be used for the operation and which contingency fluids considered to be available offshore. It is challenging to perform effective cleanouts in completions with 2 different sizes of tubings (IDs 3.74" & 2.2") combined with restrictions (1.92" nipple), the success is a function of overcoming limited fluid pumping rates, slow annular velocities, particle sizes, cleaning speeds, among others. Well conditioning for future completion operations was planned depending on successful achievements of the coiled tubing intervention. A total of 14 runs with coiled tubing using different BHA configurations were performed to complete the scope. Well was safely and successfully cleaned from a starting depth of 2,512mMD to a target depth of 5,864mMD (5,610mTVD) by removing mud deposits, consolidated sand bridges and completion restrictions. Throughout the cleanout operation, best practices discussed on planning stage were applied to remove multiple obstructions encountered and dealing with potential corkscrewed casing. By accomplishing the well delivery, it is evident that the methodology followed during the planning stage and execution, was crucial to save the well from being lost or abandoned. There was an uncertainty whether the completion integrity was compromised by the high pressures used during the bullheading operation. Novelty in this intervention was the methodology for the risk assessment for an unconventional live well intervention with a 17,500-psi BHP, unseen pressure in the region. Thorough structural analysis was performed to assure the coiled tubing equipment could be placed safely on the platform to condition the well to regain production

Download Full-text

Modeling, Analysis and Design of the Formula SAE Aerodynamics System

Volume 10: Fluids Engineering ◽

10.1115/imece2020-24374 ◽

2020 ◽

Author(s):

Isaac Van Baren ◽

Andrew Van Milligan ◽

Scott Ashcraft ◽

Stephen Rosser ◽

Xiuling Wang

Keyword(s):

Simulation Software ◽

The Body ◽

Analysis And Design ◽

Formula Sae ◽

System A ◽

Venturi Effect ◽

Modeling Analysis ◽

Straight Line ◽

Design Competition ◽

Vehicle Chassis

Abstract This project developed a study on methods to increase downforce on the university’s Formula SAE vehicle by implementing a lightweight, efficient aerodynamic design. The team planned to improve the performance and reduce lap times of the vehicle with an undertray, which grants better wheel traction and stability while handling corners. Upon completion, the aerodynamic component would have allowed the PNW Motorsports team to more effectively compete at the FSAE design competition in the spring of 2020. While reducing drag, an undertray provides the capability to direct the air beneath the vehicle chassis in a way which adds “artificial weight” to the system. A pressure gradient of high magnitude is established between the two sides of the undertray, with a low negative pressure region found beneath the body. This design is based upon the principles of fluid dynamics, in particular the venturi effect through the use of nozzles and diffusers. In this fashion, the vehicle can receive the benefits of a heavier car around corners while maintaining the higher straight-line acceleration of a lighter car. This report describes the use of simulation software in the design of an undertray, as well as the approach to manufacture it. Two-dimensional benchmark cases were performed in the replication of results obtained in a literature search. Subsequently, the undertray model was optimized with CFD and FEA/FEM techniques to obtain a component that was prepared for manufacturing. An operating procedure was established to outline the complicated steps of its assembly. Finally, it provides future aerodynamics teams with a solid foundation upon which improvements can be made.

Download Full-text

Japan's Shift Toward a Westminster System: A Structural Analysis of the 2005 Lower House Election and Its Aftermath

Asian Survey ◽

10.1525/as.2006.46.4.632 ◽

2006 ◽

Vol 46 (4) ◽

pp. 632-651 ◽

Cited By ~ 25

Author(s):

Margarita Estéévez-Abe

Keyword(s):

Structural Analysis ◽

Prime Minister ◽

Direct Result ◽

The Political ◽

System A ◽

Lower House ◽

Political Drama ◽

Structural Force ◽

House Election ◽

Rules Of The Game

This article argues that the political drama surrounding Prime Minister Koizumi Junichiro is a direct result of the political reforms implemented in Japan during the last decade. The new rules of the game have produced a structural force pushing Japan to resemble a Westminster system.

Download Full-text