The Performance of the Hydraulic Expansion Toolholder in High-Speed Rotation

2011 ◽  
Vol 188 ◽  
pp. 457-462 ◽  
Author(s):  
Shu Lin Wang ◽  
Wei Zhan Zhang ◽  
Qin Zhang ◽  
G. Liu ◽  
Z.J. Yang
Keyword(s):  
Finite Element Analysis ◽  
High Speed ◽  
Rotation Speed ◽  
Analysis Software ◽  
Element Analysis ◽  
Fluid Analysis ◽  
High Speed Rotation ◽  
Speed Rotation ◽  
High Rotation Speed ◽  
Pressure Changes

On the basis of finite element analysis, the static transmitted torque of Hydraulic Expansion Toolholder is validated. At the same time fluid analysis software is used to investigate the oil pressure changes in oil chamber wall because of different rotation speed. Then through the fluid-solid coupling, the article analyzes the chuck clamping performance on the factors of expansion chuck and tool clearance, rotation speed, and hydraulic oil pressure when toolholder on the state of high rotation speed.

Finite-Element Analysis of Arranging Intermediate Cuttings Tool of Circular Saw Web and Wedge Disc

2013 ◽  
Vol 631-632 ◽  
pp. 1068-1072
Author(s):  
Yan Wu ◽  
Yan Ma
Keyword(s):  
Finite Element Analysis ◽  
High Speed ◽  
Working Condition ◽  
Three Dimensional ◽  
Element Analysis ◽  
Three Dimensional Modeling ◽  
Circular Saw ◽  
Dimensional Modeling ◽  
High Speed Rotation ◽  
Speed Rotation

When the intermediate cuttings cut the wood, the efficiency of the vibration of the circular saw web was low so that the saw web always broke off. Moreover, the high-speed rotation would cause the vibration of the complete machine and result in the initial failure of the machine. Therefore, seeing from the problems from the analysis above and practice, the new design of the current micro intermediate cuttings seemed especially important. In the thesis, the author made a new arrangement of the micro intermediate cuttings of machinery tools, carrying out three-dimensional modeling and simulation of the complete machine and made an analysis of the dynamic cutting process by means of analyzing the working condition of circular saw web.

Hydrostatic-Hydrodynamic Bearing Design of High-Speed Camshaft Grinding

2012 ◽  
Vol 590 ◽  
pp. 385-390 ◽  
Author(s):  
Yu Huang ◽  
Shang Zhang ◽  
Yi Lin Liu ◽  
Bi Peng ◽  
Guo Jun Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Speed ◽  
Analysis Software ◽  
Element Analysis ◽  
Linear Speed ◽  
Hydrodynamic Bearing ◽  
Bearing Stiffness ◽  
Bearing Design ◽  
The Relationship

Conditions for changing acceleration and force spindle when the high-speed high-precision camshaft grinding with the action of follow grinding and the constant linear speed grinding，a step-pocket cavity hydrostatic -hydrodynamic bearings is designed to meet this precision camshaft grinding, and the relationship between eccentricity and bearing stiffness, load are analyzed by the method of finite-element analysis with fluid finite element analysis software.

scholarly journals Current superimposition variable flux reluctance motor with 8 salient poles

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 857-861
Author(s):  
Kazuaki Takahara ◽  
Katsuhiro Hirata ◽  
Noboru Niguchi ◽  
Akira Kohara
Keyword(s):  
Finite Element Analysis ◽  
Electric Vehicles ◽  
Hybrid Electric Vehicles ◽  
Rotation Speed ◽  
Element Analysis ◽  
Iron Losses ◽  
Reluctance Motor ◽  
High Rotation Speed ◽  
Variable Flux ◽  
A Current

AbstractWe propose a current superimposition variable flux reluctance motor for a traction motor of electric vehicles and hybrid electric vehicles, which consists of 10 salient poles in the rotor and 12 slots in the stator. However, iron losses of this motor in high rotation speed ranges is large because the number of salient poles is large. In this paper, we propose a current superimposition variable flux reluctance motor that consists of 8 salient poles and 12 slots. The characteristics of the 10-pole-12-slot and 8-pole-12-slot current superimposition variable flux reluctance motors are compared using finite element analysis under vector control.

scholarly journals A Review of the High-speed Permanent Magnet Rotor Stress Analysis used for Automotive Air-handling Machines

2020 ◽  
Vol 5 (4) ◽  
pp. 448-456
Author(s):  
Levi Ryan Mallin ◽  
Simon Mark Barrans
Keyword(s):  
Permanent Magnet ◽  
Plane Strain ◽  
High Speed ◽  
Element Analysis ◽  
Interference Fit ◽  
Centrifugal Load ◽  
High Speed Rotation ◽  
Speed Rotation ◽  
Rotor Assembly ◽  
Analytical Approaches

Machines incorporating high-speed electrical machines (HSEM) are becoming increasingly common place in applications including air handling, energy storage and medical devices. They are of increasing interest within the automotive field for air handling applications. HSEM’s use surface-mounted permanent magnet (PM) rotors, manufactured from rare earth metals. However, these PM’s have low tensile strength and are susceptible to failure under the centrifugal load produced at high speed rotation. Retaining sleeves which are an interference fit around the magnets, provide compression and hence resistance to tensile stress. The ability to predict the stresses within the rotor assembly is essential for robust design. This review paper examines existing analytical calculations and finite element analysis (FEA) models. The analytical approaches include both plane stress and plane strain models and the limitations of these are discussed. For relatively long rotors, a generalised plane strain approach is suitable, however it is seldom used. In addition, this latter approach has not been extended to assemblies where the magnets are assembled onto a carrier or shaft. Optimisation of rotors has been addressed in a relatively small number of papers. However, further work is required in this area to ensure that the optimised rotors can be manufactured.

Energy Conversion for Gas Isentropic Compression Process with High Speed Rotation

2013 ◽  
Vol 336-338 ◽  
pp. 899-906
Author(s):  
Haakon Karlsen ◽  
Tao Dong
Keyword(s):  
Energy Conversion ◽  
High Speed ◽  
Stokes Equations ◽  
Ideal Gas ◽  
Navier Stokes ◽  
Compression Process ◽  
Element Analysis ◽  
Isentropic Compression ◽  
High Speed Rotation ◽  
Speed Rotation

Energy conversion from rotational to thermal is investigated for a compressible ideal gas. The high speed rotation is considered as the driven force of the isentropic compression. The analytical model explaining the thermodynamic parameters (pressure, pressure gradient, density, and especially temperature) are developed. The analytical results are compared with the simulation data obtained from Finite Element Analysis, which employs compressible Navier-Stokes equations and heat equation. A good accordance between the analytical and FEA results has been observed. And it shows a predictable beginning and end state for the isentropic rotation process.

Micro Turbocharger on a Single Silicon Rotor

2004 ◽  
Author(s):  
P. Kang ◽  
S. Tanaka ◽  
M. Esashi
Keyword(s):  
High Speed ◽  
Journal Bearing ◽  
Rotation Speed ◽  
Bonding Temperature ◽  
Preliminary Test ◽  
Anodic Bonding ◽  
Thrust Bearings ◽  
High Speed Rotation ◽  
Speed Up ◽  
Speed Rotation

This paper describes the design, fabrication and preliminary test of a MEMS-based turbocharger. In this device, a compressor and a turbine are formed on the same side of the rotor to escape miss-alignment during bonding process. The rotor is supported by hydrostatic journal and thrust bearings. The device rotated only at low rotation speed up to 2500 rpm, and the rotation speed did not remarkably changed by adjusting air supplies to the hydrostatic bearings. From the test results, we found important issues to be solved for high speed rotation. Concerning to fabrication, flat and smooth bearing surfaces is difficult to fabricate, and bearing/tip clearances are difficult to precisely control due to spikes on etched surfaces and the warp of the devices induced by anodic bonding. We developed special deep RIE recipe to realize spike-free, uniform etching. And, we found that the wafer warp became negligible at a bonding temperature of 320 °C and an applied voltage of 400–600 V, when a 1 mm thick Pyrex glass substrate was used. Even after 5 times anodic bonding to stack 6 wafers, the warp was below 2 μm. The other concern is on bearing design. The journal bearing has a very low L/D number (length divided by diameter). As a result, the journal bearing has a small journal surface, and it is difficult to install orifices on the journal bearing. Additionally, there is interference between the journal and thrust bearing due to air leakage.

Numerical Simulation of Thermal Deformation of High Speed and Exactitude Thermo Grip

2010 ◽  
Vol 136 ◽  
pp. 264-268
Author(s):  
Z.G. Wang ◽  
L. Xu ◽  
Huali Gang Wei ◽  
L.D. Xu ◽  
H.H. Yu
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Deformation Theory ◽  
High Speed ◽  
Thermal Deformation ◽  
Simulation Analysis ◽  
Deformation Model ◽  
Analysis Software ◽  
Element Analysis

Built the thermal deformation model of high-speed and exactitude thermo grip according to the thermal deformation theory .And numerical simulation of the thermal stress was performed by finite element analysis software of ANSYS. The thermal deformation experiment had be done with φ10 and φ16 specifications thermo grip. Experimental data and simulation analysis are fit well. It provides the theory support for the optimal design of thermo grip.

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