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A brief overview of Soichi Ibaraki's recent research topics. If you need more detailed information, do not hesitate to contact me by e-mail.
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For my projects at Hiroshima University since Nov. 2016, please see Homepage of Mechanical Design and Systems Laboratory.
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1. Accuracy Calibration of 5-axis Machine Tools
5-axis machine tools or integrated machine tools have been rapidly accepted in the world-wide machine tool market, and have been recognized as one of main forces for Japanese machine tool builders. These projects study calibration methodologies of motion accuracies of such a machine.
>> R-test Analysis Software ("FKD System")
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>> Machining Tests for Thermal Deformation Evaluation
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>> Non-contact R-test
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>> R-test (cont'd)
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>> R-test
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>> Error Calibration using Touch-trigger Probe
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>> DBB5
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>> A Machining Test for Error Diagnosis on 5-axis Machines
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>> Machining Error Simulator and Error Compensation
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>> Measurement of Motion Errors of a Universal Spindle on Integrated Machine Tools
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2. Volumetric Errors
The importance of the calibration of volumetric errors, or the measurement of three-dimensional positioning error over the entire three-dimensional workspace, has been recognized for the error calibration of machine tools. These projects are related to the calibration of volumetric errors.
>> Proposal of "Movable" Machine Tool
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>> "Open-loop" Laser Tracker (3D Case)
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>> "Open-loop" Laser Tracker (2D Case)
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>> Vision-based Measurement of 2D Position Errors
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>> Laser Step Diagonal Measurement
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>> Laser Trackers
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>> Self-calibration of a Cross Grid Encoder
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3. On-machine Geometric Measurement
Projects above are on the measurement of a machine's motion. Here geometric mesurement of an object is studied. My particular interest is in on-machine measurement.
>> Speckle Noise's Influence on Triangulation-based Laser Displacement Sensors
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>> 5-axis on-machine Laser Measurement
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4. Control of End Milling Processes
Recent technological development in machine tools or tools has rapidly popularized high-speed machining of hardened materials. To perform safe, and high-efficient machining, however, very careful process planning by an expert machine operator is often crucial. We consider that the control of machining processes are a key technology to fully utilize the potential of high-speed machining centers for high productive machining even by a non-expert operator. In these projects, technologies related to lower-cost, higher-reliability process control schemes are studied.
>> Control of Tool Life
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>> On the Estimation of Cutting Forces
Publications:
JJ8,
CJ20,
JJ7,
CE15,
CJ14
>> Identification of a Cutting Force Prediction Model in Canned Cycles and Model-based Feedrate Optimization
Publications:
CJ20,
CJ23
>> Learning Control of Cutting Forces
Publications:
CE8,
CJ7,
CJ6
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5. Tool Path Planning for End Milling Processes
Tool paths for end milling processes are often designed by using a CAM software. On a CAM software, tool paths are given by simply offsetting the final product geometry (contour parallel or direction parallel tool paths). Since such a tool path is generated based only on the geometry of the product to be machined, without any consideration on machining process itself, it often causes a problem in actual machining processes, such as the tool damage. We have been studying tool path planning strategies particularly for end milling processes of hardened materials in die and mold manufacturing.
>> Constant Engagement Tools Path Generation
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>> Insertion of Trochoidal Grooving Paths into Critical Cutting Regions
Publications:
JE15,
CE18,
CE17,
CJ16
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6. Parallel Mechanism Machine Tools
Although it has been almost ten years since the first parallel mechanism machine tool of six degrees of freedom was developed, it is still not widely accepted in today's commercial market. It has a critical and inherent limitation in the motion accuracy and the servo stiffness. This project focuses on the improvement of its motion accuracies from the viewpoint of the parameter calibration and the error compensation.
>> Calibration of Kinematic Parameters by Circular Tests
Publications:
JJ4,
CJ15,
CE20,
CJ24,
CJ22
>> A Disturbance Observer for a Parallel Mechanism
Publications:
JJ6,
CE22
>> Compensation of Gravity-induced Errors
Publications:
JE3,
CJ19,
CJ17
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7. Servo Control of Feed Drive Systems
For latest high-speed, high-acceleration feed drive systems in NC machine tools, motion control issues are of more importance. For example, high acceleration often causes the structural vibration, which significantly deteriorates the machine's contouring accuracy in a high-speed operation. In this project, various approaches are proposed to address specific issues in the motion control of feed drive systems based on control theories or numerical optimization.
>> Design of Damping Filters by Numerical Optimization
Publications:
JJ5,
CE8
>> Automatic Tuning of Servo Parameters
Publications:
JJ3,
CE4,
CJ12
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8. Control Applications of Numerical Optimization
Numerical optimization problems related to control issues, such as the H-infinity optimization problem, are researched. Various approaches are proposed to extend the conventional theory to more general problems, and their practical application examples are presented. The following projects were finished in my graduate studies at UC Berkeley (1996-2001).
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>> Ph.D. Dissertation:
M3
>> H-infinity Optimization of Fixed-structure Controllers
Publications:
JE1,
JE2,
CE2,
CJ4
>> Solving BMI Problems for the Extension of H-infinity Optimization
Publications:
CE3
>> H-infinity State Observers
Publications:
JE5,
CE5,
CE1
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