Jin Chen - Academia.edu (original) (raw)
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Sasin Graduate Institute of Business Administration of Chulalongkorn University
Islamic Azad University, Science and Research Branch
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Papers by Jin Chen
IEEE Design & Test of Computers, 1996
This paper describes a simple test generation technique which derives sinusoidal test waveforms t... more This paper describes a simple test generation technique which derives sinusoidal test waveforms that detect several fault classes. In addition, the authors show that certain stimuli will provoke variations in delay, rise time, and overshoot that indicate faulty behavior. Simple algorithms compute the different parameters
Journal of Engineering for Industry, 1993
An error compensation system has been developed to enhance the time-variant volumetric accuracy o... more An error compensation system has been developed to enhance the time-variant volumetric accuracy of a 3-axis machining center by correcting the existing machine errors through sensing, metrology, and computer control techniques. A general methodology has been developed to synthesize both the geometric and thermal errors of machines into a time-variant volumetric error model. Instead of the well-known 21 geometric error components, 32 machine linkage errors are formulated as a 4D error field including the space domain and the time domain. Different types of models are proposed for different kinds of thermal error components. A compensation controller based on an IBM/PC has been linked with a CNC controller to compensate for machine errors in real time. This scheme has been implemented on a horizontal machining center and has been shown, using metrology instruments, to improve the machine accuracy by an order of magnitude. A cut workpiece inspected using a coordinate measuring machine (CMM) has also shown that dimension errors have been reduced from 92.4 fim to 18.9 \x,m in a dimension of 404 x 310 mm 2 and the depth difference of milled surf aces has been reduced from 196 fim to 8 fim.
IEEE Design & Test of Computers, 1996
This paper describes a simple test generation technique which derives sinusoidal test waveforms t... more This paper describes a simple test generation technique which derives sinusoidal test waveforms that detect several fault classes. In addition, the authors show that certain stimuli will provoke variations in delay, rise time, and overshoot that indicate faulty behavior. Simple algorithms compute the different parameters
Journal of Engineering for Industry, 1993
An error compensation system has been developed to enhance the time-variant volumetric accuracy o... more An error compensation system has been developed to enhance the time-variant volumetric accuracy of a 3-axis machining center by correcting the existing machine errors through sensing, metrology, and computer control techniques. A general methodology has been developed to synthesize both the geometric and thermal errors of machines into a time-variant volumetric error model. Instead of the well-known 21 geometric error components, 32 machine linkage errors are formulated as a 4D error field including the space domain and the time domain. Different types of models are proposed for different kinds of thermal error components. A compensation controller based on an IBM/PC has been linked with a CNC controller to compensate for machine errors in real time. This scheme has been implemented on a horizontal machining center and has been shown, using metrology instruments, to improve the machine accuracy by an order of magnitude. A cut workpiece inspected using a coordinate measuring machine (CMM) has also shown that dimension errors have been reduced from 92.4 fim to 18.9 \x,m in a dimension of 404 x 310 mm 2 and the depth difference of milled surf aces has been reduced from 196 fim to 8 fim.