Inverse methods to gradient etch three-dimensional features with prescribed topographies using abrasive jet micro-machining: Part I – Modeling

2016 ◽  
Vol 45 ◽  
pp. 272-284 ◽  
Author(s):  
M.R. Sookhak Lari ◽  
M. Papini
Keyword(s):  
Three Dimensional ◽  
Inverse Methods ◽  
Micro Machining

A Three-Dimensional Inverse Method for Turbomachinery: Part I—Theory

1990 ◽  
Vol 112 (3) ◽  
pp. 346-354 ◽  
Author(s):  
J. E. Borges
Keyword(s):  
Velocity Field ◽  
Inverse Method ◽  
Three Dimensional ◽  
Tangential Velocity ◽  
Inverse Methods ◽  
Meridional Section ◽  
Low Speed ◽  
Present Procedure ◽  
Blade Row ◽  
The Mean

There are surprisingly few inverse methods described in the literature that are truly three dimensional. Here, one such method is presented. This technique uses as input a prescribed distribution of the mean swirl, i.e., radius times mean tangential velocity, given throughout the meridional section of the machine. In the present implementation the flow is considered inviscid and incompressible and is assumed irrotational at the inlet to the blade row. In order to evaluate the velocity field inside the turbomachine, the blades (supposed infinitely thin) are replaced by sheets of vorticity, whose strength is related to the specified mean swirl. Some advice on the choice of a suitable mean swirl distribution is given. In order to assess the usefulness of the present procedure, it was decided to apply it to the design of an impeller for a low-speed radial-inflow turbine. The results of the tests are described in the second part of this paper.

Inverse methods in aeroacoustic three-dimensional volumetric noise source localization and quantification

2020 ◽  
Vol 473 ◽  
pp. 115208 ◽  
Author(s):  
G. Battista ◽  
P. Chiariotti ◽  
M. Martarelli ◽  
P. Castellini
Keyword(s):  
Source Localization ◽  
Noise Source ◽  
Three Dimensional ◽  
Inverse Methods

Study on Micro Mill-Grinding Technology

2013 ◽  
Vol 390 ◽  
pp. 586-590 ◽  
Author(s):  
Chao Wang ◽  
Ya Dong Gong ◽  
Guo Qiang Yin ◽  
Xue Long Wen ◽  
Jun Cheng
Keyword(s):  
Surface Roughness ◽  
Abrasive Particle ◽  
Three Dimensional ◽  
Micro Milling ◽  
Mechanical Processing ◽  
Micro Machining ◽  
Micro Scale ◽  
Abrasive Grains ◽  
Machining System ◽  
Spraying Method

Micro mechanical processing is the effective method for machining micro scale parts. Micro mill-grinding technology is presented based on micro milling and micro grinding processes. The machining principle of micro mill-grinding is studied, and compound tools for micro mill-grinding are fabricated based on spraying technology. Experiments are performed on Al 6061-T6 with the three-dimensional micro machining system. The results show that submicron surface roughness can be obtained by micro mill-grinding. Abrasive grains of mill-grinding tools fabricated by spraying method shed easily. Smaller abrasive particle size improves the surface quality and increases the tool life.

A study of three-dimensional high-aspect ratio micro-machining

2003 ◽  
Vol 2003.78 (0) ◽  
pp. _5-5_-_5-6_
Author(s):  
Kazunori TERADA ◽  
Norio TAGAWA ◽  
Atsunobu MORI ◽  
Shinichi MOTOYAMA
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Three Dimensional ◽  
Micro Machining

A Three Dimensional Inverse Method in Turbomachinery: Part I — Theory

1989 ◽  
Author(s):  
João Eduardo Borges
Keyword(s):  
Velocity Field ◽  
Inverse Method ◽  
Three Dimensional ◽  
Tangential Velocity ◽  
Inverse Methods ◽  
Meridional Section ◽  
Low Speed ◽  
Present Procedure ◽  
Blade Row ◽  
The Mean

There are surprisingly few inverse methods described in the literature that are truly three-dimensional. Here, one such method is presented. This technique uses as input a prescribed distribution of the mean swirl, i.e., radius times mean tangential velocity, given throughout the meridional section of the machine. In the present implementation the flow is considered inviscid and incompressible and is assumed irrotational at inlet to the blade row. In order to evaluate the velocity field inside the turbomachine, the blades (supposed infinitely thin) are replaced by sheets of vorticity whose strength is related to the specified mean swirl. Some advice on the choice of a suitable mean swirl distribution is given. In order to assess the usefulness of the present procedure, it was decided to apply it to the design of an impeller of a low-speed radial-inflow turbine. The results of the tests are described in the second part of this paper.

Simulation of Ultrashort Laser Pulse Absorption At the Water-metal Interface in Laser-Induced Plasma Micro-Machining

2020 ◽  
Author(s):  
Jiaxi Xie ◽  
Kornel Ehmann ◽  
Jian Cao
Keyword(s):  
Dielectric Breakdown ◽  
Constitutive Relations ◽  
Three Dimensional ◽  
Optical Breakdown ◽  
Micro Machining ◽  
Metal Interface ◽  
Breakdown Threshold ◽  
Laser Induced Plasma ◽  
Water Metal ◽  
Ultrashort Laser

Abstract This work proposes a physically consistent numerical model to simulate ultrashort laser absorption by a metallic workpiece at the water-metal interface when optical breakdown of the dielectric occurs. The simulation couples the framework of the Finite-Difference Time-Domain method used in computational electromagnetics with the constitutive relation derived from both the model of direct ablation of metals and the first order model of water breakdown. The simulation is used to describe interface ablation processes such as Laser-Induced Plasma Micro-Machining. Applied to the water-aluminum interface, the model is able to describe the metal absorption and the dielectric breakdown threshold in three-dimensional geometry. It is an extensible monolithic approach in which the absorption by different materials can be described by simply changing the constitutive relations.

A Review of Certain Inverse Methods for the Design of Ducts With 2- or 3-Dimensional Potential Flow

1988 ◽  
Vol 41 (6) ◽  
pp. 217-238 ◽  
Author(s):  
John D. Stanitz
Keyword(s):  
Boundary Layer ◽  
Flow Field ◽  
Three Dimensional ◽  
Inverse Methods ◽  
Design Methods ◽  
Two Dimensional ◽  
3 Dimensional ◽  
Fluid Handling ◽  
Layer Behavior ◽  
Flow Field Design

This article reviews the author’s work on inverse methods of flow-field design with prescribed velocity distributions on the boundaries. Such design methods are of some importance, because these velocity distributions, on the boundaries of fluid-handling equipment, determine the boundary-layer behavior and thereby affect the equipment efficiency. The work is limited to design methods for stationary channels with incompressible or subsonic compressible flow. Both two- and three-dimensional design methods are reviewed. The two-dimensional work was done in the early 1950’s and the three-dimensional work in the 1980’s.

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