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자전거 편집설계를 위한 부품형상 정보 모델 기반 CAD 라이브러리 제어 방법
명병수(B.S. Myung),이재선(J. Lee),김병철(B.C. Kim),문두환(D. Mun),이한민(H. Lee),박성환(S. W. Park) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.6
A library of parametric CAD models should be provided for the reuse of design data in configuration design. Mechanical products have many options and parameters, which in turn, require a large number of CAD models for configuration designs. Existing methods for library construction are limited in their ability to decrease the number of CAD models and ensureindependency between theconfiguration design system and the library. To solve these problems, we propose a method thatcontrolsa CAD library based on part-shape information model, and also present its technical details. To verify the proposed method, a CAD library for bicycles was constructed and design modification experiments usinga prototype part-shape controller were performed. From the experiments, we found that the proposed method can effectively decrease the required number of CAD models by reusingmodels for configuration designs.
小型 機關의 消音器 設計를 위한 音響測定 및 分析 프로그램의 開發
명병수,노광모,최규홍,황성만,김성태 公州大學校 資源科學硏究所 1995 資源科學硏究論文集 Vol.3 No.-
To reduce the exessive noise from the engine of the farm machinery, the precise measuring equipments and analyzing apparatus are required. The exhaust noise of an engine varies continuously between several ranges, it can not be, therefore, measured accurately by the noise indicator commercially available. In this study, acoustic measuring and analyzing system with a high reproducibility of the exhaust noise were developed to investigate desingn paramenters of a muffler and to manufacture an effective silencer of the small farm diesel engine. The system consisted of a microcomputer, sound recognition board, A/D converter, FFT and PSD analysis programs, etc. The results of the experiments were summarized as follows; 1. At the experimental apparatus were produced with the resonance and abnormal sound induced at the rear of the speaker were absorbed, and playbacks of the recorded sound were set up as the original sound resources. The sound resources recorded on the engine removed muffer and were input and analyzed at the microcomputer. 2. The developed system with high sensitivity microphone and microcomputer could be applied as the range as 1㎑, and proved to be useful in the noise measurement and analysis for small diesel engines, and the result of statistical analysis showed a high significance below 1% between original and reproduced sound conditions.
黃成萬,明炳洙 公州大學校 資源科學硏究所 1994 資源科學硏究論文集 Vol.2 No.-
This study was conducted to show the characteristics of vibration with small diesel engine at varied load and loaded. The engine used is the engine that is used to motor in rural areas and to powered tiller The results were summarized as follows: 1. The natural frequency of vibration with 7.5kW diesel engine was 49Hz in full load of net output. 2. The engine vibration was excessive at X-, Y-, and Z-axis in full load of net output. 3. When the loads was varied, the vibration was showed largely at 4.5 - 6.0kW loads. 4. From the FFT and statistical analysis, the type of vibration of engine was bi-mode in all loads. 5. The minimum hysteresis losses were showed in 2.8kW loads at X-axis, in 7.5kW loads at Y-axis and in 3.7kW loads at Z-axis and the maximum hysteresis losses were showed in 9.0kW loads at all axis. 6. The RMS of vibration was slightly increased at X-and Z-axis, and was not varied at Y-axis.