Design Aspects of a Cardiac Action Hydraulic Pump

2015 ◽  
Author(s):  
Mohamed Elgamil ◽  
Khaled Mostafa ◽  
Marwan El-Husseiny ◽  
Saad Kassem
Keyword(s):  
High Performance ◽  
High Pressures ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Hydraulic Pump ◽  
Element Analysis ◽  
Flow Rates ◽  
Control Chamber ◽  
Chamber Volume ◽  
Cardiac Action

This paper presents some design aspects of a high pressure cardiac action hydraulic pump consisting of several pumping heads. Each head has a set of followers that completely encircle a cam. The followers separate a pumping chamber, formed between the cam and the followers, from a control chamber existing outside the followers. With the cam rotation the followers move outwards and inwards with respect to the cam, causing the pumping chamber volume to increase and decrease to suck and pump oil. The pump geometric volume can be controlled by controlling the stroke of the followers through the control of the oil volume in the control chamber. Three different methods are proposed to transmit the motion from the cam to the followers. In the first method the followers are in direct contact with the cam, while in the second intermediate cylindrical rollers are inserted between the followers and the cam. In the third method, specially shaped pads are inserted between the cam and the followers. Finite element analysis (FEA) using ANSYS Mechanical software is carried out to compare between these methods regarding the generated contact stresses between the cam and the followers. FEA is also utilized to design a self-integrated priming spring in the external lips of the followers in order to allow smooth pump start up at all operating conditions. The suction and delivery valves of this pump are crucial for its reliability and high performance. They should allow high flow rates at small pressure drop and should be compact, of low inertia to operate at high frequency, and of minimum deformation under high pressures. A CFD analysis for a proposed design for these valves is performed using ANSYS/FLUENT program on three-dimensional models, where the flow rates, the pressure and velocity distributions, and the deformations of these elements are calculated.

Mechanical and Optimization Analyses for Novel Wound Composite Axial Impeller

2009 ◽  
Author(s):  
Jifeng Wang ◽  
Qubo Li ◽  
Norbert Mu¨ller
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Speed ◽  
High Performance ◽  
Low Cost ◽  
Three Dimensional ◽  
Von Mises Stress ◽  
Loading Conditions ◽  
Element Analysis ◽  
Wound Composite

A mechanical and optimal analyses procedure is developed to assess the stresses and deformations of Novel Wound Composite Axial-Impeller under loading conditions particular to centrifuge. This procedure is based on an analytical method and Finite Element Analysis (FEA, commercial software ANSYS) results. A low-cost, light-weight, high-performance, composite turbomachinery impeller from differently designed patterns will be evaluated. Such impellers can economically enable refrigeration plants using water as a refrigerant (R718). To create different complex patterns of impellers, MATLAB is used for creating the geometry of impellers, and CAD software UG is used to build three-dimensional impeller models. Available loading conditions are: radial body force due to high speed rotation about the cylindrical axis and fluid forces on each blade. Two-dimensional plane stress and three-dimensional stress finite element analysis are carried out using ANSYS to validate these analytical mechanical equations. The von Mises stress is investigated, and maximum stress and Tsai-Wu failure criteria are applied for composite material failure, and they generally show good agreement.

Design of an LTCC Structure for a Micro-Ceramic Combustor

2012 ◽  
Vol 2012 (CICMT) ◽  
pp. 000288-000293
Author(s):  
Darko Belavic ◽  
Marko Hrovat ◽  
Gregor Dolanc ◽  
Kostja Makarovic ◽  
Marina Santo Zarnik ◽  
...  
Keyword(s):  
High Pressures ◽  
Three Dimensional ◽  
Ceramic Technology ◽  
Electronic Components ◽  
Buried Structures ◽  
Flow Rates ◽  
Points Of View ◽  
Micro Systems ◽  
Micro Combustor ◽  
Harsh Conditions

Advanced micro- or macro-systems are in some cases made with multilayer ceramic technology. Low-Temperature Co-fired Ceramic (LTCC) technology is considered as one of the more suitable technologies for the fabrication of ceramic micro-systems that integrate screen-printed, thick-film electronic components as well as three-dimensional buried structures, for example, cavities and channels. One of the applications is a ceramic combustor. The chemical energy of the fuel is converted into thermal energy in a chemical micro-combustor through a burning process, while the accompanying high temperatures and, frequently, high pressures impose harsh conditions on the combustor structure. Therefore, the combustor must be carefully designed not only from the functional, thermal and chemical points of view, but also with respect to the mechanical strength. The combustor device was prepared by laminating of Du Pont 951PX LTCC green tapes. The fabricated 3D LTCC structures with buried cavities and channels including two inlets (for fuel and air), the evaporator for the fuel, the mixing system of the channels (for mixing the evaporated fuel and air), the distribution channels and eight microburners were realized. The main parts are eight micro-burners realized as buried cavities. In the burners a platinum-based catalyst was deposited to assist the oxidation, i.e., the burning, of the methanol with the air. Thickfilm, platinum-based heaters and temperature sensors are incorporated within the structure. The device was tested with different flow rates of liquid methanol (1 ml/h to 5 ml/h) and air (7 l/h to 15 l/h). The obtained temperatures were between 250°C and 450°C.

Design and Fabrication of an LTCC Structure for a Microceramic Combustor

2012 ◽  
Vol 9 (3) ◽  
pp. 120-125 ◽  
Author(s):  
Darko Belavic ◽  
Marko Hrovat ◽  
Gregor Dolanc ◽  
Kostja Makarovic ◽  
Marina Santo Zarnik
Keyword(s):  
Thick Film ◽  
High Pressures ◽  
Three Dimensional ◽  
Temperature Sensors ◽  
Ceramic Technology ◽  
Electronic Components ◽  
Buried Structures ◽  
Flow Rates ◽  
Points Of View ◽  
Harsh Conditions

Advanced microsystems or macrosystems are in some cases made with multilayer ceramic technology. Low-temperature cofired ceramic (LTCC) technology is considered to be one of the more suitable technologies for the fabrication of ceramic microsystems that integrate screen-printed, thick-film electronic components as well as three-dimensional buried structures, for example, cavities and channels. One of the applications is a ceramic combustor. The chemical energy of the fuel is converted into thermal energy in a chemical microcombustor through a burning process, while the accompanying high temperatures and, frequently, high pressures, impose harsh conditions on the combustor structure. Therefore, the combustor must be carefully designed not only from the functional, thermal, and chemical points of view, but also with respect to the mechanical strength. The combustor device was prepared by lamination of Du Pont 951PX LTCC green tapes. The fabricated 3D LTCC structures with buried cavities and channels including two inlets (for fuel and air), the evaporator for the fuel, the mixing system of the channels (for mixing the evaporated fuel and air), the distribution channels and eight microburners were realized. The main parts are eight microburners realized as buried cavities. In the burners, a platinum-based catalyst was deposited to assist the oxidation, that is, the burning, of the methanol with the air. Thick-film, platinum-based heaters and temperature sensors are incorporated within the structure. The device was tested with different flow rates of liquid methanol (1 mL/h to 5 mL/h) and air (7 L/h to 15 L/h). The temperatures obtained were between 250°C and 450°C.

The Finite Element Analysis of South Cap Excavation of Left Branching of Ma on Shan Yangtze River Highway Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 4207-4211
Author(s):  
Yue Zhang ◽  
Mi Zhou
Keyword(s):  
Yangtze River ◽  
Simulation Analysis ◽  
Soft Soil ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Highway Bridge ◽  
Foundation Pit ◽  
Element Analysis ◽  
Calculation Results ◽  
Stress And Deformation

South pile foundation of Ma On Shan Yangtze River Highway Bridge is big, deep, soft soil, groundwater rich. In order to guarantee the safeties of the foundation, its foundation pit supporting schemes are compared, selected and calculated, finally lock mouth steel pipe support is selected as the design and construction scheme. The three-dimensional simulation analysis of the scheme is calculated by using MIDAS software, simulated four construction condition is presented, and stress and deformation results of retaining structure on various operating conditions is obtained. The calculation results show that the palisade structure basic satisfies the requirements of caps excavation and caps concrete construction. The results of construction show that the construction method, model and parameters used in this paper are basic right, the reasonableness of Supporting is confirmed and for the similar large foundation pit construction provides useful reference.

Three-Dimensional Creep Analysis of Solder Joints in Surface Mount Devices

1995 ◽  
Vol 117 (1) ◽  
pp. 20-25 ◽  
Author(s):  
Pardeep K. Bhatti ◽  
Klaus Gschwend ◽  
Abel Y. Kwang ◽  
Ahmer R. Syed
Keyword(s):  
High Performance ◽  
Degrees Of Freedom ◽  
Three Dimensional ◽  
Nonlinear Material ◽  
Computational Time ◽  
Nonlinear Creep ◽  
Element Analysis ◽  
Surface Mount ◽  
Creep Analysis ◽  
Highly Nonlinear

Three-dimensional finite element analysis has been applied for determining time-dependent solder joint response of leaded surface mount components under thermal cycling. Two main challenges are the geometric complexity in mesh development and computationally intensive analysis because of the highly nonlinear material properties. Advanced techniques have been applied, including multi-point constraints for mesh transition, which reduces the number of degrees of freedom in the model, and substructuring, which effectively reduces computational time in the iterative analysis. The result is a generic approach for nonlinear creep analysis using commercial FEA software on a high performance workstation. Illustrations are provided for J and gullwing leaded packages.

scholarly journals Development of Automatic Equipment for Washing and Nondestructive Inspection of Stud Bolt

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
H. S. Kwak
Keyword(s):  
High Pressures ◽  
Nondestructive Inspection ◽  
Operating Conditions ◽  
Energy Utilization ◽  
Steam Turbines ◽  
Cleaning Efficiency ◽  
Automatic Equipment ◽  
Element Analysis ◽  
Pressure Steam ◽  
Screw Threads

Low-pressure steam turbines in a power plant are required to operate at high temperatures and under high pressures to achieve better energy utilization and better performance. Higher operating temperatures accelerate the rate of oxidation and sludge formation, so the steam turbine is periodically inspected including strict examination of the stud bolts, and it is necessary to clean the bolts by removing sludge from their screw threads. In the conventional cleaning process, the sludge has been removed by manual cleaning, which is labor-intensive and time-consuming. Therefore, this study developed automatic equipment for washing and nondestructive inspection of stud bolts using theoretical analysis and finite element analysis (FEA). An optimal clamp load to prevent sliding of the roller was calculated, and a structural analysis of the equipment under operating conditions was conducted. An optimal washing condition to maximize cleaning efficiency was proposed using design of the experiment and verified by performing washing test of prototype.

scholarly journals STAMINA OF A GASKETED BOLTED FLANGED PIPE JOINT UNDER DYNAMIC LOADING

2016 ◽  
Vol 17 (2) ◽  
pp. 137-155
Author(s):  
Muhammad Abid
Keyword(s):  
Three Dimensional ◽  
Operating Conditions ◽  
Axial Loads ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Dynamic Operating ◽  
Critical Components ◽  
Three Dimensional Finite Element ◽  
Bolted Flange ◽  
Pipe Joint

Gasketed bolted flange joints are the most critical components in pipelines for their sealing and strength under operating conditions. Most of the work available in literature is under static loading, whereas in industry, cyclic loads are applied due to the vibrating machinery such as motors, pumps, sloshing in offshore applications and in the ships etc. In this study a three dimensional finite element analysis of a gasketed joint is carried out using a spiral wound gasket under bolt up and dynamic operating conditions (internal pressure, axial and bending) singly and in combination. The cyclic axial loads are concluded relatively more challenging for both the sealing and strength of the joint. Higher magnitudes of loads and frequencies are also observed more challenging to the joints performance.

Finite Element Analysis on Dynamic Characteristics of Maglev Suspension System

2013 ◽  
Vol 834-836 ◽  
pp. 1497-1500
Author(s):  
Jian Xiang Tang ◽  
Xin Hua Jiang ◽  
Jiang Min Deng ◽  
Te Fang Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Characteristics ◽  
High Performance ◽  
Degrees Of Freedom ◽  
Three Dimensional ◽  
Suspension System ◽  
Three Dimensional Model ◽  
Maglev Train ◽  
Element Analysis

In this paper, electromagnetic dynamic characteristics of suspension system of middle-low speed maglev train are analyzed with finite element analysis (FEA) method based on the high-performance computing platform (HPC). The couple structure between F-type track and suspension magnet is meshed by pretension element. The dynamic characteristics of suspension system are simulated in three-dimensional model with 4 degrees of freedom motions condition. Both the numerical simulations and the actual force tests of suspension system are carried out with the same input. The result shows that the calculation accuracy of finite element analysis is high.

Three Dimensional Finite Element Interference Contact Analysis about Cone Screw and Bush of Opposed Biconinal Cone Screw High-Pressure Seawater Hydraulic Pump

2012 ◽  
Vol 197 ◽  
pp. 174-178 ◽  
Author(s):  
Xin Hua Wang ◽  
Xiu Xia Cao ◽  
Shu Wen Sun ◽  
Yan Gao
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Displacement Vector ◽  
Three Dimensional ◽  
Von Mises Stress ◽  
Hydraulic Pump ◽  
Maximum Displacement ◽  
Element Analysis ◽  
Factors Affecting ◽  
Von Mises

The main components of the opposed biconinal cone screw high-pressure seawater hydraulic pump is the rubber bush and metal cone screw, and the interaction of the bush and cone screw is one of the main factors affecting the novel pump performance. The deformation and stress of the bush and cone screw under the initial interference is analyzed by the nonlinear finite element analysis. The analysis shows that: under the effect of the initial interference, large displacement is present to the radial surface of the cone screw, and the displacement of the radial surface mainly affects the displacement vector sum of the cone screw, and the deformation decreases gradually from the middle to the ends of the cone screw, while the cone screw is bending; the deformation in three direction of the bush is close to each other, but the location of the maximum displacement in each direction is different; with the shrink range increasing, the deformation of the cone screw and bush increases, but the deformation of the cone screw is much smaller than that of bush, so the deformation of the bush mainly affects the seal between the cone screw and bush, and the shrink range between the cone screw and bush decreases because of the deformation of the bush. Over the role of the interference force, the maximum von mises stress of the cone screw is an order larger than that of bush, and the maximum von mises stress both increases with the shrink range increasing; although shrink range is different, the location of the maximum von mises about the cone screw and bush is the same.

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