Thermal-hydraulic model for axial piston pump with leakage and friction and its application

2019 ◽  
Vol 71 (6) ◽  
pp. 810-818
Author(s):  
Guanglin Shi ◽  
Haiji Wang
Keyword(s):  
Simulation Model ◽  
Hydraulic System ◽  
Design Methodology ◽  
Control Volume ◽  
Hydraulic Model ◽  
Mechanical Loss ◽  
Hydraulic Simulation ◽  
Content Type ◽  
Volume Method ◽  
Axial Piston

Purpose This paper aims to carry out a thermal-hydraulic simulation model for pump and hydraulic system to predict the temperature increasing and pump performance. Based on the model, how to alleviate the temperature is introduced. Besides, the optimization of piston is carried out. Design/methodology/approach This paper analyzes the heat generation in lubricating interfaces of the pump with energy conversion theory. The heat transfer inside the pump is analyzed with the control volume method. The simulation model is constructed in AMESim because of its operating friendly nature. The experiment is carried out to prove the validity and accuracy of the simulation model. Findings Temperature has less effect on the mechanical loss of pump. However, it has a great impact on volumetric efficiency. To reduce the temperature on the piston surface, the size of the piston should be optimized. Originality/value This paper fulfills a novel thermal-hydraulic model to evaluate the temperature of the pump. Based on the model, the performance of the pump is determined and optimization is carried out.

scholarly journals Hydraulic analysis of underground bioretention systems

2021 ◽  
Author(s):  
Sogol Bandehali
Keyword(s):  
Water Pollution ◽  
Water Quality ◽  
Simulation Model ◽  
Low Impact Development ◽  
Hydraulic Model ◽  
Hydraulic Analysis ◽  
Hydraulic Simulation ◽  
Bioretention Cell ◽  
Design Options ◽  
Water Quality And Quantity

The conventional practices of urbanization significantly increase the flooding and water pollution. This is due to reduction in pervious areas. To minimize the problem, various concepts of low impact development have been implemented such as underground bioretention cells. The main intention of this research was to review different aspects of Low Impacts Developments (LIDs) especially bioretention cells and develop a hydraulic model to predict the distribution of runoff throughout the bioretention cell under different scenarios. In this study, the hydraulic simulation model was developed in Matlab in order to attain better understanding of bioretention systems. The hydraulic model was used to investigate the impacts of different design options on the distribution of flows over the entire bioretention cell. Understanding the effect of design options can be beneficial to improve the performance of bioretention systems and improving the water quality and quantity in developed areas.

Simulation and optimization of thrust circular bearings with planes sector-shaped

2014 ◽  
Vol 66 (1) ◽  
pp. 75-82 ◽  
Author(s):  
Claudio J.C. Blanco ◽  
Alvaro T. Prata ◽  
Francisco C.L. Pessoa
Keyword(s):  
Design Methodology ◽  
Reynolds Equation ◽  
Pressure Field ◽  
Content Type ◽  
Thrust Bearings ◽  
Simulation And Optimization ◽  
Method Of Lagrange Multipliers ◽  
Volume Method ◽  
Better Than ◽  
Optimized Geometries

Purpose – The purpose of this paper is to analyze journal thrust bearings geometries, used in household refrigerators, using a modified version of the Reynolds equation which includes the inertial terms. Design/methodology/approach – The Reynolds equation was solved through the finite volume method, thus providing the pressure field in the lubricant film and, consequently, the load and the power used by the bearing. Such parameters depend on bearing geometry, which was optimized through the method of Lagrange multipliers, to support a given load and use the lowest power possible. The optimized geometries included the Rayleigh pad with 4, 8 and 16 steps, and a milled geometry with 4 steps. Findings – For the Rayleigh pad, the number of steps was varied and a decrease in the power consumed with the increase in the number of steps was observed. The milled pad performance was better than that Rayleigh pad with 4 steps and comparable to the pad with 8 steps. Originality/value – The manufacture of pads, with a high number of steps, is complicated and, then, a milled pad with 4 steps was proposed in this paper. The use of milled pads is a technological innovation worthy of a more thorough investigation, considering its facility of manufacture when compared to the Rayleigh pad.

Construction by Contour Crafting using sulfur concrete with planetary applications

2016 ◽  
Vol 22 (5) ◽  
pp. 848-856 ◽  
Author(s):  
Behrokh Khoshnevis ◽  
Xiao Yuan ◽  
Behnam Zahiri ◽  
Jing Zhang ◽  
Bin Xia
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Model ◽  
Design Methodology ◽  
Construction Material ◽  
Construction Process ◽  
Element Analysis ◽  
Content Type ◽  
Contour Crafting ◽  
Finite Element Analysis Simulation

Purpose This paper aims to report on the experiments with the Contour Crafting Automated Construction process using sulfur concrete as the choice of construction material. Design/methodology/approach Several experiments have been performed at centimeter and meter scales. A finite element analysis simulation model for the behavior of sulfur concrete-based structures has been developed. Experimental results were compared with the results of simulation. Findings Sulfur concrete has numerous terrestrial applications and is potentially an ideal construction material for planetary construction. Originality/value Experimental samples of sulfur concrete were fabricated using a novel mixer/extrusion system. The mechanism was proven to be durable and stable after more than 500 h of work.

Framework for the optimization of online computable models

2014 ◽  
Vol 33 (3) ◽  
pp. 745-758 ◽  
Author(s):  
Benoit Delinchant ◽  
Frédéric Wurtz ◽  
João Vasconcelos ◽  
Jean-Louis Coulomb
Keyword(s):  
Simulation Model ◽  
Web Service ◽  
Optimization Algorithm ◽  
Design Methodology ◽  
Optimization Algorithms ◽  
Software Component ◽  
The Internet ◽  
Content Type ◽  
Optimization Framework

Purpose – The purpose of this paper is to make easily accessible models to test and compare the optimization algorithms we develop. Design/methodology/approach – For this, the paper proposes an optimization framework based on software component, web service, and plugin to exploit these models in different environments. Findings – The paper illustrates the discussion with optimizations in Matlab™ and R (www.r-project.org) of a transformer described and exploitable from the internet. Originality/value – The originality is to make easy implementation of simulation model and optimization algorithm coupling using software component, web service, and plugin.

Age-based maintenance for a fleet of haul trucks

2018 ◽  
Vol 24 (4) ◽  
pp. 511-528 ◽  
Author(s):  
Patarawan Chaowasakoo ◽  
Heikki Seppälä ◽  
Heikki Koivo
Keyword(s):  
Simulation Model ◽  
Design Methodology ◽  
Cost Control ◽  
Open Pit Mine ◽  
Open Pit ◽  
Total Production ◽  
Content Type

Purpose The most costly part in an open-pit mine is the transportation of material out of the mine. The efficiency of the truck-and-shovel fleet plays a major role in cost control. The paper aims to discuss these issues. Design/methodology/approach The truck dispatching simulation model with consideration of age-based maintenance is proposed. Findings This paper underlines an impact of truck dispatching decisions and reveals remarkable differences in the total production under different approaches of operational availability. Additionally, the simulated results introduce an effective scheduled maintenance for different truck age levels. Originality/value The approach is based on a case study taking into account the stochastic equipment behavior and environment in a real open-pit mine. This approach can be used more generally in situations in which truck fleets are used to transport material.

Arbitrary movement simulation using 3D NC-FVM for electromagnetic problems

2018 ◽  
Vol 37 (4) ◽  
pp. 1306-1314
Author(s):  
Ishaq Amrani ◽  
Ahmed Cheriet ◽  
Mouloud Feliachi
Keyword(s):  
Design Methodology ◽  
Magnetic Force ◽  
Problem Domain ◽  
Content Type ◽  
Electromagnetic Problems ◽  
Fixed Part ◽  
Volume Method ◽  
Movement Simulation ◽  
Mesh Technique ◽  
Moving Parts

Purpose The purpose of this paper is to propose to simulate an arbitrary movement in electromagnetic problems by means of a 3D nonconforming finite volume method (NC-FVM). The moving part can be displaced according to the x, y and/or z direction. Design/methodology/approach The 3D nonconforming mesh technique coupled to the FVM is used to handle arbitrary displacement of moving parts. Accordingly, the whole problem domain is divided into two parts: moving part and fixed part. Both parts are meshed independently. By using a suitable connection between both fixed and moved meshes, the movement can be performed according to the three axes. Findings The TEAM Workshop Problem No. 23 is used to test the proposed method. The calculated values of the magnetic force applied to the permanent magnet for different positions of the magnet show the efficiency of the proposed method. Originality/value This paper introduces the NC-FVM to solve electromagnetic problems which contain moving parts. Here, the movement can be performed according to the three axes.

Aircraft test of engineered material arresting system

2018 ◽  
Vol 90 (1) ◽  
pp. 229-236
Author(s):  
Hong-Yu Yao ◽  
Xiang-Jun Kong ◽  
Ya-Jie Shi ◽  
Xian-Bo Xiao ◽  
Ning-Ning Le
Keyword(s):  
Simulation Model ◽  
System Design ◽  
Design Methodology ◽  
Field Tests ◽  
Test Results ◽  
Practical Application ◽  
Core Component ◽  
Content Type ◽  
Model Aircraft ◽  
Test Verification

Purpose Engineered material arresting systems (EMASs) are dedicated to stopping aircraft that overrun the runway before they enter dangerous terrain. The system consists of low-strength foamed concretes. The core component of the arresting system design is a reliable simulation model. Aircraft test verification is required before the practical application of the model. This study aims to propose a simulation model for the arresting system design and conducts serial verification tests. Design/methodology/approach Six verification tests were conducted using a Boeing 737 aircraft. The aircraft was equipped with an extra inertia navigation system and a strain gauge system to measure its motion and the forces exerted on the landing gears. The heights of the arrestor beds for these tests were either 240 or 310 mm, and the entering speeds of the aircraft ranged from 23.9 to 60.6 knots. Findings Test results revealed that both the aircraft and the pilots on board were safe after the tests. The maximum transient acceleration experienced by the dummies on board was 2.5 g, which is within the human tolerance. The model exhibited a satisfied accuracy to the field tests, as the calculation errors of the stopping distances were no greater than 7 per cent. Originality/value This study proposes a simulation model for the arresting system design and conducts serial verification tests. The model can be used in EMAS design.

Simulation of Fe3O4-H2O nanoliquid in a triangular enclosure subjected to Cattaneo–Christov theory of heat conduction

2019 ◽  
Vol 29 (11) ◽  
pp. 4430-4444 ◽  
Author(s):  
A.S. Dogonchi ◽  
Muhammad Waqas ◽  
M. Mudassar Gulzar ◽  
M. Hashemi-Tilehnoee ◽  
Seyyed Masoud Seyyedi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Heat Conduction ◽  
Shape Factor ◽  
Design Methodology ◽  
Control Volume ◽  
Content Type ◽  
Controlling Element ◽  
Triangular Enclosure ◽  
Control Volume Finite Element ◽  
The Magnetic Field

Purpose The purpose of this research is to describe the importance of the Cattaneo–Christov theory of heat conduction in a triangular enclosure with a semi-circular heater. Analysis subjected to Fe3O4-H2O nanofluid is reported. Viscosity dependent on magnetic field is taken into consideration to simulate ferrofluid viscosity. Besides, heat generation and shape factor of nanoparticles are also considered. Design/methodology/approach The well-known control volume finite element method is used for simulations. Findings The outcomes reveal that the magnetic field can be introduced to the system as a controlling element. Originality/value No such analysis exists in the literature.

Electro-thermo-convection in dielectric liquid subjected to partial unipolar injection between two eccentric cylinders

2019 ◽  
Vol 29 (1) ◽  
pp. 78-93
Author(s):  
Mohamed Issam Elkhazen ◽  
Walid Hassen ◽  
Hakan F. Öztop ◽  
Lioua Kolsi ◽  
Abdullah A.A.A. Al-Rashed ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Rayleigh Number ◽  
Design Methodology ◽  
Dielectric Liquid ◽  
Eccentricity Ratio ◽  
Governing Equations ◽  
Content Type ◽  
Eccentric Cylinders ◽  
Volume Method ◽  
Unipolar Injection

Purpose The purpose of this work is to highlight the effects of partial unipolar injection on electro-thermo-convection (ETC) in dielectric liquid contained between two eccentric cylinders. Design/methodology/approach A finite volume method was used to solve governing equations. The study is performed for different parameters, such as radius ratio (0.2 ≤ Γ ≤ 0.6), dimensionless electric Rayleigh number (0 ≤ T ≤ 900), eccentricity (−0.4 ≤ e ≤ 0.4) and thermal Rayleigh number (10 ≤ Ra ≤ 5.105). Findings It is found that heat transfer increases with increase in dimensionless electric Rayleigh number and eccentricity ratio. Originality/value The originality of this work is to analyze the ETC in dielectric liquid subjected to partial unipolar injection between two eccentric cylinders

Finite volume solution of 2-D hyperbolic conduction with contact resistance

2017 ◽  
Vol 27 (9) ◽  
pp. 2154-2172 ◽  
Author(s):  
S. Han
Keyword(s):  
Heat Flux ◽  
Contact Resistance ◽  
Finite Volume ◽  
Design Methodology ◽  
Heterogeneous Medium ◽  
Heterogeneous Materials ◽  
Heat Fluxes ◽  
Content Type ◽  
Volume Method ◽  
Hyperbolic Conduction

Purpose The purpose of this paper is to present a numerical methodology for the solution of non-Fourier conduction in two-dimensional (2-D) heterogeneous materials with contact resistance. Design/methodology/approach Energy and heat flux equations with time lagging constant are combined to form a 2-D hyperbolic conduction equation in conservational form, and the resulting equation is solved by finite volume method. Findings The magnitude of contact resistance is inversely proportional to the temperature jump at the contact surface and phonon transmission coefficient between heterogeneous medium. Numerical results show that higher the contact resistance, lower the heat flux through the interface, lower the strength of transmitted wave and higher the strength of reflected wave at the interface. These results are in agreement with physical expectations. Temperature profiles show expected discontinuity at the interface while the heat fluxes are continuous, demonstrating the accuracy of the proposed methodology. Originality/value In most available numerical methods for hyperbolic conduction with contact resistance, contact resistances are treated as internal boundaries at which boundary conditions are specified. In the present formulation, contact resistance between two heterogeneous materials is treated as a part of interface transport properties not as an added boundary condition. This approach makes the formulation much simpler and straightforward for multidimensional applications. This approach is never used previously and is original.

Sign in / Sign up

Export Citation Format

Share Document