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장인권(In Gwun Jang),유용균(Yong Gyun Yu),곽병만(Byung Man Kwak) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Evolutionary topology optimization using design space adjustment and refinement is used to optimize a knuckle in the suspension system of an automobile. Design space optimization used in this paper is a new efficient method for large-scale topology optimization by virtue of two reasons. First, the design space adjustment including multi-layer design space expansion and reduction is suitable for large-scale problems by virtue of its evolutionary nature. Second, the design space refinement can be done locally or globally when and where necessary and thus is very effective in obtaining a target resolution with much less number of elements. Minimum compliance for a knuckle is considered with the actual working condition to show the effectiveness and superiority of the new approach.
Lightweight Design of the Stub Axle Using Topology Optimization
김진수(Jinsu Kim),노홍승(Hong Seong Roh),민연주(Yeonjoo Min),허성호(Sung-Ho Hur),장인권(In Gwun Jang) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.7
This study reviews the assumption that the lightweight design of commercial vehicles is significant from the aspect of the anticipated fuel consumption and environmental regulations that are consequently applicable to those vehicles. Generally speaking, it is noted that among the numerous trailer components, a stub axle, which is designed to independently operate as an integral part of trailer’s suspension, can play an important role in increasing the shipping capacity of a box trailer. For this reason, because each stub axle is comparatively a heavy unit in itself, and a total of six stub axles are mounted in a box trailer, the lightweight design of a stub-axle is noted as an essential factor to reduce the whole weight of a trailer. For a finite element analysis, an original CAD model is modified through removing a chamber, airbag, axle drum, bearing and pivot on a vehicle. In addition, the loading conditions are imposed considering three extreme driving conditions and the effects are studied when in the event of review of a fully loaded in a box trailer. A topology optimization is conducted to determine a lightweight design for minimizing compliance under these boundary conditions.
김종호(Jong Ho Kim),신영준(Young June Shin),장인권(In Gwun Jang) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In order to achieve an enhanced fingertip force, the distributed actuation mechanism (DAM) was recently proposed. In this paper, the dual-mode operation of a three-link DAM manipulator is proposed to achieve either the maximum force or the maximum velocity along a given direction at a given end-effector position. Mathematical expressions are derived for the end-effector force and velocity. Then, the maximum force and velocity are determined with the limited motor power through the optimization. In order to demonstrate the performance of the dual-mode operation, the application examples are presented and experimentally validated.
PWM 인버터에 의한 전류 고조파를 고려한 매입형 영구자석 동기전동기(IPMSM)의 형상 최적화
노수성(Su Seong Noh),이창우(Changwoo Lee),장인권(In Gwun Jang) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
In this paper, Pulse Width Modulation (PWM) inverter is designed and simulated with the motor. Since the PWM inverter generates the current harmonics, additional coreloss occurs into the rotor and stator. Using this co-simulation of the motor system, the shape optimization of the interior permanent magnet synchronous motor(IPMSM) is performed to minimize coreloss at the high speed. This paper suggests the optimized shape of the IPMSM minimizing the coreloss at high speed.
김종호(Jong Ho Kim),신영준(Young June Shin),김경수(Kyoung-Soo Kim),장인권(In Gwun Jang) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this paper, a new type of an excavator which adopts distributed actuation mechanism was proposed to enhance excavation performance. Distributed actuation mechanism can provide additional design parameters to improve manipulation performance, as already shown in our previous paper with a robotic finger. For the purpose of performance enhancement, we first derived the digging force of the proposed excavator and then analyzed its efficiency. Through the numerical simulations, digging force was increased by 71%.