Analysis and Simulation of BIG-PLUS Tooling System

2012 ◽  
Vol 426 ◽  
pp. 201-204
Author(s):  
H.L. Xue ◽  
Gui Cheng Wang ◽  
Chun Gen Shen ◽  
S.L. Wang
Keyword(s):  
Finite Element ◽  
Radial Displacement ◽  
Element Model ◽  
Radial Clearance ◽  
Clamping Force ◽  
Positioning Accuracy ◽  
Spindle Positioning ◽  
Rotating Speed ◽  
Tool Holder ◽  
Tooling System

A new finite element model of BIG-PLUS tooling system are made, the BIG-PLUS tool holder and spindle deformation owing to centrifugal force generated by displacement, as well as different speed and clamping force of the radial displacement are analyzed and simulated. The results show that the radial clearance and deformation between spindle and tool holder can expand as the rotating speed increases, enhancing the clamping force and the shank of the spindle positioning accuracy and reliability of connection.

Finite Element Analysis for the Crankshaft of the Piston Compressor

2010 ◽  
Vol 102-104 ◽  
pp. 17-21
Author(s):  
Bin Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Natural Frequencies ◽  
Piston Compressor ◽  
Element Model ◽  
Ansys Software ◽  
Element Analysis ◽  
Rotating Speed ◽  
Dynamical Characteristics ◽  
The Finite Element Model

In order to study the static and dynamical characteristics of the crankshaft, ANSYS software was used to carry out the corresponding calculations. The entity model of the crankshaft was established by UG software firstly, and then was imported into ANSYS software for meshing, and then the finite element model of the crankshaft was constructed. The crankshaft satisfied the requirement of stiffness and strength through static analysis. The top six natural frequencies and corresponding shapes were acquired through modal analysis, and the every order critical rotating speed of the crankshaft was calculated. The fatigue life of the crank was calculated by fatigue module of ANSYS software finally. These results offered the theoretical guidance for designing, manufacturing and repairing the crankshaft.

Combined Effects of Tube Projection, Initial Tube-Tubesheet Clearance, and Tube Material Strain Hardening on Rolled Joint Strength

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
N. Merah ◽  
A. Al-Aboodi ◽  
A. N. Shuaib ◽  
Y. Al-Nassar ◽  
S. S. Al-Anizi
Keyword(s):  
Finite Element ◽  
Strain Hardening ◽  
Contact Pressure ◽  
Joint Strength ◽  
Element Model ◽  
Design Parameters ◽  
Radial Clearance ◽  
Tube Material ◽  
Element Analysis ◽  
Interfacial Pressure

The tube-to-tubesheet joint strength is measured in terms of interfacial pressure between the tube’s outer surface and tubesheet bore. The strength of a rolled joint is influenced by several design parameters, including the type of tube and tubesheet materials, initial tube projection, and the initial radial clearance between the tube and tubesheet, among other factors. This paper uses finite element analysis (FEA) to evaluate the effect of several parameters on the strength of rolled joints having large overtolerances, a situation that applies to used equipment. An axisymmetric finite element model based on the sleeve diameter and rigid tube expanding roller concepts was used to analyze the effects of tube projection, initial tube-tubesheet clearance, and tube material strain-hardening property on the deformation behavior of the rolled tube and on the strength of the tube-tubesheet joint. The FEA results show that for zero tube projection (flush) the initial clearance effect is dependent on the strain-hardening capability of the tube material. For low strain-hardening tube material the interfacial pressure remains constant well above the Tubular Exchanger Manufacturer’s Association maximum overtolerance. A drastic reduction in joint strength is observed at high values of radial clearances. The cut-off clearance (clearance at which the interfacial pressure starts to drop) is found to vary linearly with the tube material hardening level, and the contact stress increases slightly for moderate strain-hardening tube materials but shows lower cut-off clearance levels. Furthermore, with flush tubes the maximum contact pressure occurs close to the secondary face (at the end of rolling) while for joints with initial tube projection the contact pressure shows two maxima occurring near the primary and the secondary faces. This is attributed to the presence of two elbows in tube deformation near the primary and secondary faces. The average interfacial pressure increased with increasing projection length for all clearances. Tube material strain hardening enhances the interfacial pressure in a similar fashion for all initial tube projection lengths considered in the analysis.

Numerical Simulation of Self-Loosening of Bolted Joints under Cyclic Transverse Loads

2014 ◽  
Vol 487 ◽  
pp. 488-493 ◽  
Author(s):  
Shi Yuan Hou ◽  
Ri Dong Liao
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Step Length ◽  
Shear Loading ◽  
Bolted Joints ◽  
Shear Load ◽  
Clamping Force ◽  
The Finite Element Method ◽  
Force Amplitude ◽  
Transverse Loads

Self-loosening is one of the major failure reasons for bolted joints. Utilizing the finite element method, a 3-Dimension finite element model under dynamic shear loading is built to study the loosening of bolted fastener phenomenon. And the effect of increment step length, initial clamping force, amplitude of the shear load, thread tolerance, friction coefficients on the loosening process are studied.

Effect of Process Routing on Machining Deformation for Multi-Frame Double Sided Monolithic Components

2010 ◽  
Vol 97-101 ◽  
pp. 2894-2897 ◽  
Author(s):  
Zhi Tao Tang ◽  
Zhan Qiang Liu ◽  
Li Qiang Xu
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Coordinate Measuring Machine ◽  
Element Model ◽  
Fe Model ◽  
Clamping Force ◽  
Optimal Process ◽  
Machining Deformation ◽  
Measuring Machine ◽  
Monolithic Components

When machining aerospace monolithic components, a severe deformation can be observed due to the release and redistribution of the original residual stresses, together with the action of cutting loads and clamping force. In this paper, a finite element model predicting machining deformation was developed considering the above mentioned multi-factors coupling effects. Based on the model, the effect of process routing on machining deformation for multi-frame double sided monolithic components was studied. To validate the FE model, true frame components were machined and deformations were measured on a Coordinate Measuring Machine. The result revealed that the prediction model is credible. At last the paper puts forwards optimal process routing based on minimizing the machining deformation.

Numerical and experimental investigation of the vibration of rotors with loose discs

2009 ◽  
Vol 224 (1) ◽  
pp. 85-94 ◽  
Author(s):  
M Behzad ◽  
M Asayesh
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Experimental Tests ◽  
Element Model ◽  
Equation Of Motion ◽  
Finite Element Code ◽  
Rotating Speed ◽  
Rotating Discs ◽  
Gyroscopic Effects ◽  
Measurement Location

In this study, the energy method has been used to develop a finite-element code for studying the effects of loose rotating discs on the rotor—bearing systems’ response. A mathematical model of the loose disc has resulted in terms similar to unbalance and gyroscopic effects in the equation of motion of the system. Results of this study show that rotor response and beating phenomena are a function of measurement location, loose disc mass and inertia, ratio of rotating speed to the speed of loose disc, and clearance between the loose disc and shaft considering constant speed for loose disc and shaft. The developed finite-element model can numerically give the response of rotors with any number of loose discs at any location with isotropic or orthotropic supports. Results of numerical calculation have been verified by experimental tests.

scholarly journals FE Analysis on Contact Properties between Root- Blade and Slot-Disc

2011 ◽  
Vol 2-3 ◽  
pp. 932-935 ◽  
Author(s):  
Bo Ping Wang ◽  
Jiao Wang ◽  
Xing Zhan Li ◽  
Qing Kai Han
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Contact Pressure ◽  
Equivalent Stress ◽  
Element Model ◽  
Contact Analysis ◽  
The Finite Element Method ◽  
Concentration Effects ◽  
Rotating Speed ◽  
Disk Structure

The contact problem between root-blade and slot-disk structure of compressor is of much importance, because there is serious stress concentration in the structure, which is one of the parts with multi faults in aero-engine. First, finite element model for dovetail attachment is established to analyze stress concentration effects. Then, the stress distribution and other parameters such as contact pressure is obtained through contact analysis. In this paper, the finite element method based on contact analysis is used. Calculating results show that equivalent stress, contact pressure of blade-disk structure increase steadily as the rotating speed increases.

scholarly journals Model Updating and Structural Optimization of Circular Saw Blades with Internal Slots

2014 ◽  
Vol 6 ◽  
pp. 546496
Author(s):  
Wei-Hsin Gau ◽  
Kun-Nan Chen ◽  
Yunn-Lin Hwang
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Structural Integrity ◽  
Model Updating ◽  
Element Model ◽  
Frequency Separation ◽  
Element Analysis ◽  
Sizing Optimization ◽  
Rotating Speed ◽  
Circular Saw

Circular diamond saws rotating in high speed are widely used to cut hard materials, and narrow slots on saw blades are sometimes used to reduce the blades' vibration and noise. Sizing optimization of the internal, annular slots on saw blades is investigated in this paper. First, an accurate finite element model representing an actual saw blade is obtained by model updating. Then, sizing optimization on two types of annular slots is performed to maximize the frequency separation between the finite element analysis results and the saw blade's operational speed and to reduce the possibility of structural resonance. Optimization results demonstrate great improvements in frequency separation from the rotating speed of 500 Hz for the optimized models, and stress analyses on the optimized blade models confirm the structural integrity of the designs.

scholarly journals Assessment of the Local and Global Stability of the Luzzone Arch Dam Including Visualisation of the Data Analysis

2021 ◽  
Vol 13 (7) ◽  
pp. 4062
Author(s):  
Faham Tahmasebinia ◽  
Rowan Doskey ◽  
Omar Elrich ◽  
David Kelly ◽  
Samad Sepasgozar ◽  
...  
Keyword(s):  
Finite Element ◽  
Global Stability ◽  
Radial Displacement ◽  
Numerical Models ◽  
Element Model ◽  
Failure Criteria ◽  
Arch Dam ◽  
Rigid Base ◽  
Local And Global Stability ◽  
Rock Structure

This study investigates the local and global stability of the Luzzone Dam. Two finite element models were built; one with foundation rock, the other without. The purpose of this was to demonstrate a potential gulf between rigid connection modelling, and rock–structure interaction (RSI). Strand7 is not a traditional geotechnical finite element model (FEM) program, though performed well when modelling radial displacement on the Luzzone Dam. Generally, the percentage between a rigid base and RSI model displacement was 10%. This result was validated against previous numerical models on the structure. Static loads produced a radial displacement on the crown structure of 9.01 cm. Uneven stress distributions at the base of the structure were shown to be the most unpredictable result. With rigid base connections, these loads produced peak tensile stresses of 10.7 MPa. This was greater than its dynamic counterpart, asking questions about fully fixed restraints. It is noted that this is above yield and should be investigated further. Special attention will be devoted to determining the failure criteria in the simulated dams to suggest better practical guide lines for the practical engineers on site.

scholarly journals Numerical Simulation and Experimental Study on the Drilling Process of 7075-t6 Aerospace Aluminum Alloy

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 553
Author(s):  
Haitao Luo ◽  
Jia Fu ◽  
Tingke Wu ◽  
Ning Chen ◽  
Huadong Li
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Axial Force ◽  
Element Model ◽  
Drilling Process ◽  
Feed Speed ◽  
Rotating Speed ◽  
Simulation Results

A finite element model for setting drilling conditions is established. The effect of feed speed and spindle speed on the drilling process was studied. In the test phase, drilling tests were conducted using three different feed speeds (60, 100, and 140 mm/min) and three different spindle speeds (800, 1000, and 1200 rpm). The correctness of the finite element model was verified by comparing the experimental and numerical simulation data. The results show that the axial force and torque increase significantly with the increase of feed speed, while the axial force and torque increase less as the spindle speed increases. The numerical simulation results show that the temperature of the cutting edge increases as the feed speed increases. Increasing the rotating speed increases the formation of chip curl. When the working conditions are high rotating speed and low feed, the tool wear is reduced, and the machining quality is better. The numerical simulation results obtained for the chip forming effect are similar to the experimental data. In addition, the simulation results show the generation of burrs. A comparison of the finite element simulation and experimental data leads to an in-depth understanding of the drilling process and ability to optimize subsequent drilling parameters, which provide reliable process parameters and technical guarantees for the successful implementation of drilling technology for space suspended ball structures.

scholarly journals Finite Element Modeling and Dynamic Analysis of Rotating Disc and Drum Connected by Bolted Joints

2011 ◽  
Vol 2-3 ◽  
pp. 838-842 ◽  
Author(s):  
Zhao Ye Qin ◽  
H.Y. Wang ◽  
Fu Lei Chu
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Element Model ◽  
Bolted Joints ◽  
Turbine Engines ◽  
Joint Interface ◽  
Fe Model ◽  
Rotating Disc ◽  
Rotating Speed ◽  
Bolt Preload

The disc-drum type rotors are commonly used in large gas turbine engines. In this paper, the dynamic characteristics of single stage disc-drum structure are studied based on the finite element model, where the connecting bolts are modeled using solid elements and the frictional contact at the joint interface is accommodated. In order to evaluate the nonlinearity resulting from the bolted joints, a finite element (FE) model fixing the disc and drum together is also established, and the simulation results based on the two models are compared. The effects of the bolt preload and the rotating speed on the dynamic characteristics of the disc-drum structure are also discussed. The works proposed in this paper help to enhance the understanding of the dynamics of the disc-drum type rotor.

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