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토션빔 리어 액슬의 Smooth Road Shake 향상을 위한 민감도 분석에 관한 연구
이진화(Jinhwa Lee),최진호(Jinho Choi) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
This paper describes the analysis and design sensitivity study for improving the Smooth Road Shake (SRS) performance of a vehicle with torsion beam rear suspension. SRS is one of the important ride metrics which could cause significant customer dissatisfaction, especially in USA. SRS is represented by the steering wheel and foot floor panel vibrations generated by imbalance forces of tire/wheel assembly. Steering wheel vibration is one of the representative SRS metrics that most of customers could easily feel. And there have been many studies for reducing steering wheel vibrations by finding the effective enablers such as LCA geometry, bushing, and EPS. But there have been not much focused on the foot floor vibration which could be also caused by the tire imbalance forces, especially rear wheel imbalance mass in torsion beam rear suspension. This study mainly deals with the foot floor panel vibration of a vehicle with torsion beam rear suspension by rear wheel imbalance mass, and presents the dominant factors for enhancing the smooth road shake performance and provides design guidelines based on ADAMS simulation and road tests.
더블 위시본식 현가장치의 Ride 제어 및 해석에 유용한 비선형 모델
이진화(Jinhwa Lee),박지훈(Jihoon Park),김상섭(Sangsup Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In this paper, a new nonlinear model of Double wishbone suspension system for ride Control applications is proposed. The model includes the vertical acceleration of the vehicle body mass and the motions of the tire mass subjected to shock absorber stroke displacement. In addition, it considers kinematic constraint and parameters such as toe, camber, caster. The performances of the nonlinear model is useful not only ride control applications of irregular vibrations but also ride analysis considered handling characteristic. In this paper, 3-dimensional nonlinear model is developed considered conflicting ride and handling characteristic using multi-body dynamics theory.
타이어 접지 면에서의 횡방향 컴플라이언스에 영향을 미치는 차량 인자들의 민감도 분석
이진화(Jinhwa Lee),최진호(Jinho Choi),김용석(Yongsuk Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Modern automotive companies have bent its energies to the development of environment-friendly passenger cars with high fuel efficiency and well-balanced vehicle performances such as ride & handling, NVH, safety, aero & thermal, and durability. Among those, fuel efficiency has become one of the most important factors in global vehicle development process due to stringent CO2 regulation and high oil prices. Therefore, most of major companies have been trying the best to develop mass efficient lightweight vehicles as well as fuel efficient subsystems. Tire is one of the crucial subsystems to affect fuel economy. It should be developed for minimizing the rolling resistance to reduce road loads while meeting other performance requirements. But the fuel economy tire is quite expensive, and generally has the limitation in keeping the lateral stiffness of tires for stable handling. It is required to balance between fuel economy and handling performance, and also required to properly compensate the lateral stiffness of body and suspension for the deterioration of the lateral tire stiffness. But the reinforcement of body and suspension might cause the mass increment. Hence, in order to develop a fuel efficient vehicle, optimal body and chassis stiffness should be allocated for minimizing the mass impact while meeting required performances under complex design conditions. This paper deals with a study on sensitivity analysis of vehicle factors to affect the lateral force deflection on tire contact patch in order to optimally allocate the stiffness on vehicle.
이진화 ( Jinhwa Lee ),( Sunghoon Kim ),( Eun Ji Nam ),( Sun Mi Hwang ),( Young Tae Kim ),( Sang Wun Kim ) 대한산부인과학회 2016 대한산부인과학회 학술대회 Vol.102 No.-
Objective: The aim of this study was to compare the surgical outcomes of single-port access (SPA) and conventional multi-port access total laparoscopic hysterectomies (TLH) among patients with very large uteri (500 g or more). Methods: Fifty consecutive patients who received TLH for large uterine myomas and/or adenomyoses weighing 500 g or more between February 2009 and December 2012 were retrospectively reviewed. SPA and conventional TLH were each performed in 25 patients. Surgical outcomes, including operation time, estimated blood loss, postoperative hemoglobin change, postoperative hospital stay, postoperative pain, and perioperative complications, were compared between the two groups. Results: There were no significant demographic differences between the two groups. All operations were completed laparoscopically with no conversion to laparotomy. Total operation time, uterus weight, estimated blood loss, and postoperative hemoglobin change did not signiἀcantly differ between the two groups. Postoperative hospital stay was signiἀcantly shorter for the SPA-TLH group compared to that of the conventional TLH group (median [range], 3 [2.0–6.0] vs. 4 [3–7] days; P=0.004]. There were no inter-group differences in postoperative pain at 6, 24, and 72 hours after surgery. There was only one complicated case in each group. Conclusion: SPA-TLH in patients with large uteri weighing 500 g or more is as feasible as conventional TLH. SPA-TLH is associated with shorter hospital stays compared to that of conventional TLH.