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마찰면압 및 온도 특성을 고려한 수동변속기 싱크로나이저 링의 개발
박기종(Ki-Jong Park),임채홍(Chaehong Lim),김정준(Jungjune Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The frictional surface pressure and temperature on a synchronizer ring are the most important factors in the manual transmission synchronizer system in terms of its functionality and durability aspect. In initial design stage, a practical analysis procedure is developed to predict the effects of the surface temperature or pressure on the synchronizer ring. The stress analysis. thermal analysis and their coupled analysis are involved in the process. According to the procedure. the analyses are performed and the results are discussed. PV value of the theory about energy loss rate is introduced to understand the frictional surface pressure. Shape optimization of the synchronizer ring is also carried out to minimize the PV value on the contact surface between a synchronizer ring and cone. The optimization results are discussed.
이기종 ( Ki Jong Lee ),서지현 ( Ji Hyun Suh ),안영 ( Young Ahn ),하승혜 ( Sung Hae Ha ),박주상 ( Ju Sang Park ),장은정 ( Eun Jeong Jang ),박상종 ( Sang Jong Park ),김상중 ( Sang Jung Kim ),박상운 ( Sang Woon Park ),백현욱 ( Hyun 한국정맥경장영양학회 2011 한국정맥경장영양학회지 Vol.4 No.1
Purpose: In Korea, the prevalence of metabolic syndrome has increased. The relationship between metabolic syndrome, adiponectin, and dietary components is widely known. However, the relation between cytokine and dietary components is not yet well studied in Korea. Methods: Five hundred and ninety-six Korean adults between 30 and 59 years of age were recruited by advertisement to the Bundang Jesaeng General Hospital (BJGH), and those not taking regular medications and without diagnoses of fulminant disease were included. Data was collected on anthropometric measurements, diagnostic parameters for metabolic syndrome (MetS), and 3-day dietary intakes from individuals in the study. Results: Serum adiponectin level was positively correlated with serum HDL-cholesterol level and was negatively correlated with BMI, waist circumference, and systolic and diastolic blood pressure. Intake of dietary fiber was high in the high-adiponectin group. Conclusion: High-fiber diet and adiponectin can be helpful for improving metabolic syndrome. (JKSPEN 2011; 4(1):16-20)
자동차용 수동변속기 기어트레인 래틀 현상의 동역학 해석
박기종(Ki-jong Park),임채홍(Chae Hong Lim),김정준(Jung Jun Kim) 한국자동차공학회 2007 한국자동차공학회 Symposium Vol.- No.-
The dynamic responses of a gear train in automotive manual transmission are numerically investigated in order to understand the gear rattle phenomena. The gear rattle phenomenon in automotive gear trains become an especially important issue because the vibration and noise discontents are gradually increased due to a wider use of 4-cylinder as well as diesel engines for fuel efficiency reduction. In this research, a numerical dynamic model is established with the nonlinearity by gear backlash. Its aim is to numerically describe the gear rattle condition in gear box. The engine main order and harmonic order fluctuation of input acceleration is used as a source of excitation. The real time simulation using a commercial multi-body dynamic system is carried out. Design parametric study is performed to investigate the effective parameter on the gear train rattleing.