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- 저자 : 정성필 (검색결과 561 건)
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인휠 시스템용 유성 기어 감속기의 응력 해석 및 개선 설계
정성필,정원선,박태원 한국정밀공학회 2011 한국정밀공학회지 Vol.28 No.6
The planetary gear reducer becomes more and more widely used in machine industries. The planetary gear reducer has a significant role to transmit power to wheel & tire module in the Inwheel system. Thus, the planetary gear reducer should have strong stiffness and durability. In this paper, the contact and bending stresses at the tooth of the planetary gear reducer are analyzed using MASTA, a commercial gear design and analysis software. Stress distribution at the tooth face of the sun, planetary and annulus gears are obtained using the finite element method. The design modification is performed using the response surface method. The usefulness of the design modification and optimization method presented in this paper is verified by comparing the maximum stresses of the original and optimized planetary gear tooth
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정성필,남찬혁,이필구,안서연,최성진 한국자동차공학회 2024 International journal of automotive technology Vol.25 No.1
This study proposes a system that can collect and analyze the brake particle matter generated from a vehicle and brake dynamometer. A dust cover is developed to collect brake particle matter, and the number of particle matter by size is measured using a portable aerosol spectrometer. Brake PM 10 generated when the vehicle is driving on highways, country and city roads is collected and analyzed. Based on the vehicle driving data, the test mode for the brake dynamometer is developed using the relationship between brake energy and brake power. The same brake fi ne dust collection and measurement system as the vehicle is installed on the brake dynamometer, and brake PM 10 generated according to the test mode for each road condition is collected and analyzed. As a result, the total number of brake PM 10 collected from the vehicle and brake dynamometer shows about maximum of 20% error rate for each road condition. The Pearson correlation coeffi cient for the test results is 0.9988, and it means that the vehicle and brake dynamometer test results has a strong positive relationship.
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Macro puncture를 이용한 지지층 개질 MD 분리막 개발
정성필,이강호,김홍석,이석헌 한국막학회 2016 한국막학회 총회 및 학술발표회 Vol.2016 No.11
Membrane distillation (MD) is a hydrid membrane process using the temperature difference as a driving force. In order to enhance the performance (flux) of the MD process, various membrane structures (asymmetric or bi-composite) and materials (PP, PVDF or PTFE) have been suggested. In this study, the support layer of the commercial PTFE/PP bi-composite membrane is modifed by forming the macro punctures in it. The size and location of macro punctures were varied according to the designed support layer porosities (50, 60, 70 and 80 %). The modified membrane test was conducted by using the DCMD configuration. The flux of a modified membranewas enhanced up to 27 % compared with that of pristine membrane when the size of the macro puncture and overall porosity of the support layer were larger than 20 mm2 and 60 %, respectively.
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DEVELOPMENT OF INDOOR TEST METHOD FOR PASSENGER CAR TIRES REFLECTING ROAD DRIVING CONDITIONS
정성필,이준희 한국자동차공학회 2024 International journal of automotive technology Vol.25 No.2
This study presents a method for developing a tire indoor wear test mode that refl ects road driving conditions using a Flattrac. Using a machine learning model, the slip angle, slip ratio, longitudinal force, and lateral force change according tovehicle speed and acceleration changes are estimated. Reduced data representing the estimated data are calculated using apeak–valley (PV) algorithm. Through the blocking process, representative test modes for driving and braking, right turningand left turning are derived and converted into a test mode for application to the Flat-trac. The evolution of tire tread wearis observed through 120 repeated tests, and the applicability of the test mode developed in this study is discussed.
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Design Optimization of Spring of a Locking Nut using Design of Experiments
정성필,윤지원,전갑진,박태원,정원선 한국정밀공학회 2009 International Journal of Precision Engineering and Vol. No.
The bolt and nut is a representative fastener used in a machine assembly. When a load is repetitively applied to the bolt and nut assembly in the perpendicular direction of the bolt axis, the nut gradually loosens. To address this problem, nuts of diverse structures and shapes have been developed. In this study, a loose-proof locking nut is developed using a spring. The spring prevents the loosening of the nut by augmenting the axial load of the bolt. Three dimensional finite element models for the bolt, nut, spring and vibration plate are generated, and the loosening performance of the nut is analyzed using MSC/Marc, a commercial finite element analysis program. With the optimization technique based on the design of experiments, the shape and material of the spring are optimized. The optimal results are applied to the bolt and nut connection. The performance of the newly developed locking nut with a spring is compared to that of the general nut and bolt connection without a spring and the effectiveness of the locking nut is verified.
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정성필 한국체육과학회 2006 한국체육과학회지 Vol.15 No.2
Zen is Martial Arts on the ground of the body ability and human body physiology having the root of Religion.The martial arts has been made for the defense of a religion and self protection, a dynamic requisite dancing trained to the one of self-discipline process to achieve a purpose of quiet zen, and also, in fact, proved on the development with history of buddhism.Also, the basis exercise of Martial Arts leadership, religion training process zen, not being enough personality of harmony of the mind and body, and desirable educational condition but know the best method that can purify the convenience inclination come to the development of modern civilization, and spiritual & physical imperfect cause derived into the pursuit of sensible pleasure, know that solved modern society and humanity, an modern inclination & health problem by the zen.Because structural environment of modern society, material, convenience, & pleasure pursuit lose their health to the mind & physical of a modern, it is important task of a modern that looking for mind of mankind, the absolute dignity of life and value display to infinite holy ground through Zen training one of buddhism self-discipline for the discipline the mind and body with positive measure, and training the dynamic body ability simultaneously.
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