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윤중선
- Proceedings of the Korean Society of Precision Engineering Conference
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- 1996.04a
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- pp.372-377
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- 1996
A time-optimal control law for quick, strongly nonlinear systems like revolute robots has been developed and demonstrated. This procedure involves the utilization of neural networks as state feedback controllers that learn the time-optimal control actions by means of an iterative minimization of both the final time and the final state error for the known and unknown systems with constrained inputs and/or states. The nature of neural networks as a parallel processor would circumvent the problem of "curse of dimensionality".ity".uot;.
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장진규;한명철
- Proceedings of the Korean Society of Precision Engineering Conference
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- 2000.11a
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- pp.721-724
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- 2000
This paper has been demonstrated to be essential to successful telemanipulator control when the communication delay between master arms in the operator control station and telemanipulators in the remote site. This paper includes the human dynamics to generate a control command, the monitoring force feedback in order to robust under short time delays and the controller not to requre the derivative of interaction forces. Simulation results suggest that, the proposed control system should be superior to conventional systems in terms of performance and robustness under short time delays.
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목학수;문광섭;김형주
- Journal of the Korean Society for Precision Engineering
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- v.15 no.5
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- pp.72-84
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- 1998
This paper studies the relationship between assemblability and assembly time. After analyzing characteristic factors of bolts and parts, seven different kinds of assemblability parameters were determined according to assembly process, and assemblability was also evaluated. MTM (Method-Time Measurement) and Work factor methods were used for an estimation of assembly time. It shows the relationship can be found on the basis of characteristic factors of parts and bolts by relational graphs and numerical formulas.
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유중학;최만성
- Proceedings of the Korean Society of Precision Engineering Conference
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- 1992.04a
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- pp.109-114
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- 1992
This paper describes an effect of operating condition on surface roughness in wire-cut FDM. The experimental values of surface roughness were measured by the test pieces under the condition of changing. On time, Off time, and Feed rate after fixing other conditions. The material of the test pieces is the alloy tool steel(STD 11) and was used after heat treatment. The results are as follows: 1. The surface roughness became rapidly worse according to the increase of On time and Feed rate. 2. The surface roughness became slowly better according to the increase of Off time.