Real-Time Geometric Error Compensation in Micro Grooving the Workpiece with Large Surface Area

A workpiece with a large surface area is likely to be uneven due to form error and waviness. These geometric disturbances can cause inaccurate micro shapes to be formed when micro features are micro-grooved into the surface and cause the resulting workpiece to fail to function as desired. Thus, the real-time monitoring and compensation is required to guarantee the form accuracy of micro features while machining the workpiece with a large surface area. In this study, a method is suggested for real-time measurement and compensation of geometric errors for the micro grooving of a large flat surface using a laser displacement sensor placed ahead of the cutting tool. Experimental results show that the compensated surface profiles fit the measured ones within an allowable tolerance even at cutting speeds as high as 200 mm/s.

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Real-Time Geometric Error Compensation in Micro Grooving the Workpiece with Large Surface Area

Progress of Precision Engineering and Nano Technology - Key Engineering Materials ◽

10.4028/0-87849-430-8.314 ◽

2007 ◽

pp. 314-320

Author(s):

D.B. Kang ◽

S.M. Son ◽

J.H. Ahn

Keyword(s):

Real Time ◽

Surface Area ◽

Error Compensation ◽

Geometric Error ◽

Large Surface Area ◽

Micro Grooving

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Real-time measurement of nano-agglomerate and aggregate mass and surface area concentrations with a prototype instrument

Aerosol Science and Technology ◽

10.1080/02786826.2019.1671578 ◽

2019 ◽

Vol 53 (12) ◽

pp. 1453-1467 ◽

Cited By ~ 2

Author(s):

Lipeng Su ◽

Qisheng Ou ◽

Leo N. Y. Cao ◽

Qian Du ◽

David Y. H. Pui

Keyword(s):

Real Time ◽

Surface Area ◽

Time Measurement ◽

Real Time Measurement ◽

Prototype Instrument

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An Experimental Study on Real Time Measurement of Ultrasonic Vibration Amplitude and Frequency Using Laser Displacement Sensor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.875-877.2132 ◽

2014 ◽

Vol 875-877 ◽

pp. 2132-2136

Author(s):

Yu Nong Zhang ◽

Matthew R. Stanco ◽

Z.C. Li

Keyword(s):

Real Time ◽

Ultrasonic Vibration ◽

High Speed ◽

Original Data ◽

Displacement Sensor ◽

Ultrasonic Power ◽

Laser Displacement Sensor ◽

Charge Coupled Device ◽

Real Time Measurement ◽

Filter Noise

An ultra-high-speed and high-accuracy charge-coupled device (CCD) laser displacement sensor is used to track and measure the ultrasonic vibration in real time. A series of Matlab programs are developed to filter noise from original data. The ultrasonic vibration frequency and period are evaluated and the ultrasonic amplitude is measured within accuracy ±0.1 μm. Effect of the ultrasonic power on the ultrasonic amplitude is also studied.

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An Embedded Sensor System for Real-Time Detecting 5-DOF Error Motions of Rotary Stages

Sensors ◽

10.3390/s19132855 ◽

2019 ◽

Vol 19 (13) ◽

pp. 2855 ◽

Cited By ~ 8

Author(s):

Zhi-Feng Lou ◽

Xiu-Peng Hao ◽

Yin-Di Cai ◽

Tien-Fu Lu ◽

Xiao-Dong Wang ◽

...

Keyword(s):

Real Time ◽

Geometric Error ◽

Sensor System ◽

Measuring Instruments ◽

Rotational Angle ◽

Measuring Device ◽

Radial Error ◽

Real Time Measurement ◽

Rotary Stage ◽

External Forces

The geometric error motions of rotary stages greatly affect the accuracy of constructed machines such as machine tools, measuring instruments, and robots. In this paper, an embedded sensor system for real-time measurement of two radial and three angular error motions of a rotary stage is proposed, which makes use of a rotary encoder with multiple scanning heads to measure the rotational angle and two radial error motions and a miniature autocollimator to measure two tilt angular errors of the axis of rotation. The assembly errors of the grid disc of the encoder and the mirror for autocollimator are also evaluated and compensated. The developed measuring device can be fixed inside the rotary stage. In the experiments, radial error motions of two points on the axis (h = 5 mm and 60 mm) were measured and calibrated with LVDTs, and the data showed that the radial error motions of the axis were less than 20 μm, and the calibration residual errors were less than 2 μm. When intermittent external forces were applied to the stage, the change of the stage’s error motion could also be monitored accurately.

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Real-Time Measurement Method of Rail Vehicle Wheel Flange Wear Using Inductive and Temperature Sensors

10.1115/detc2021-66879 ◽

2021 ◽

Author(s):

James Ndodana Njaji ◽

Celestin Nkundineza

Keyword(s):

Real Time ◽

Measurement Data ◽

Time Measurement ◽

Displacement Sensor ◽

Effect Of Temperature ◽

Time Data ◽

The Real ◽

Railway Systems ◽

Real Time Measurement ◽

Rail Vehicles

Abstract Railway systems are expected to be in their most safe state ensuring safe operations of trains. The contact between rail and wheel is one of the most fundamental aspects in railway systems. Therefore, instruments and measurement systems that give critical information about operating railway systems are expected to work efficiently and effectively. Previous research on using inductive displacement sensor for wheel flange wear measurement has focused on the light rail vehicles, and considered effect of temperature negligible, as opposed to mainline vehicle where the wheel temperature variation is large. Also, the filtering of noises has been done using non-real time data. This paper focuses on the real-time measurement system for freight vehicle wheel flange wear by fusing measurement data from inductive displacement and thermocouple sensors, and filtering of the noises. A CAD model of the sensor support fixed on the bogie frame is presented. Several experimental measurements are carried in the lab on a moving disk heated at different temperatures. Then multiple regression analysis of the data is carried out to come up with the measurement model equation. This equation is used for calibration in LabVIEW program interfaced with data acquisition system for real time measurement. Experimental results show effect of temperature on the inductive sensor measurement data. This effect is taken into account to quantify the clearance between the disk and the sensor tip. The precision and accuracy are determined to be 0.06 Volts and 0.03 mm, respectively. This system is expected to enhance the real-time and/or online monitoring of the safety of rail vehicles. Also, it can be integrated with Automatic Train Protection (ATP) and the detection of track lateral irregularities from the wheel flange real time measurement data.

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