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스위치의 햅틱프로파일 설계변수가 피드백 명확성에 미치는 영향
형준호(Joonho Hyeong),이재환(Jaehwan Lee) 대한인간공학회 2021 大韓人間工學會誌 Vol.40 No.3
Objective: This study aims at investigating the major design parameter of haptic profile associated with perceived feedback clarity during operation the clicky switches. Background: A feeling of feedback clarity plays an important role in PUI to improve the user satisfaction and usability. Appropriate level of feedback clarity needs to be revealed when operating a PUI in the context of product use. The feedback clarity is associated with the "drop force" which is observable in the haptic profile. Also, it is associated with the "acceleration" resulting from physical interaction between the controller and the body. But detailed physical properties of controller effect on the acceleration and the perceived feedback clarity has not been revealed yet. The haptic profile is useful method to define the design parameters of controller in quantitative manner. Method: Two design parameters, Drop Size and Drop Rate, both are composing the "drop force" at the haptic profile are defined. Drop size means that the quantities of a dropped force and the Drop Rate mean that the slope of drop curve. Ten experimental switches having different design parameters are designed and manufactured. A separate experiment, measuring the acceleration and perceived feedback clarity has performed respectively. Results: A strong correlation (r=0.957) was observed between the Drop Size and the feedback clarity. However, relatively moderate correlation (r=0.673) was observed between the Drop Rate and feedback clarity. It is means that the feedback clarity strongly affected by the Drop Size rather than the Drop Rate. Meanwhile, the correlation between the feedback clarity and the acceleration was almost perfect (r=0.984) which means the increased acceleration directly affecting the feeling of feedback clarity. Conclusion: This study suggests design strategies of PUI to achieve the preferred feedback clarity level by changing of haptic profile. Application: The results contribute to the design a PUI having satisfied level of feedback clarity.
보행의 디딤비율을 접목한 직립주행 자전거용 크랭크 구동시스템 거동분석
형준호(Joonho Hyeong),노종련(Jongryun Roh),김사엽(Sayup Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Stand-up cycling leads to fatigue on the lower limbs because whole body weight is loaded on the leg at the stance phase. Especially changing the stance phase from one leg to the other side is involves increased knee joint moment. In this study, the feature of gait pattern characterized by extended stance phase which occupies 60% of gait cycle is applied to the design of crank drive system in order to decrease lower limb fatigue. An eccentric crank axis deviated from the chaining axis is adopted to realize slow motion at stance phase and quick return at swing phase. Design parameters of eccentric crank mechanism are defined, and kinematic simulations are performed to understand the behavior of the mechanism. The simulation results say that the increased eccentric distance (A) lead to increase the deviation angle (θ) which means stance phase occupies more time of the entire cycle. This study may contribute to develop a stand up bicycle having more portability.
보행패턴을 접목한 직립주행 자전거용 크랭크 구동장치의 거동분석
형준호(Joonho Hyeong),노종련(Jongryun Roh),김사엽(Sayup Kim) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.10
인간의 보행에서 안정적인 디딤을 가능하게 하는 동작특성은 보행 일주기의 60%를 차지하는 긴 디딤국면이다. 본 연구에서는 이러한 보행패턴을 자전거의 크랭크 구동장치에 반영하여 직립자세에서 안정적으로 구동할 수 있는 자전거를 설계하고자 한다. 크랭크의 회전속도를 디딤국면에서는 느리게, 되돌림국면에서는 빠르게 움직이도록 급속귀환 기구를 크랭크 구동시스템에 적용하였다. 이 급속귀환 크랭크기구의 설계변수를 정의하고 설계변수의 변화가 크랭크의 거동에 미치는 영향을 시뮬레이션 하였다. 또한 실험장치를 제작한 후 탑승자의 구동동작을 분석한 결과 보행패턴을 접목한 크랭크는 사용자 무게중심 안정화에 기여하는 것으로 나타났다. 향후 보행패턴을 접목한 크랭크는 서서 타는 자전거의 구동시스템에 접목 가능할 것으로 보인다. Gait stability is partly characterized by an extended stance phase that comprises 60% of the gait cycle. In this study, a gait pattern was employed for a crank drive system that allows for stable lower limb kinematics during stand-up cycling. A quick return mechanism was applied to the crank system to allow for a slow rotation of the crank during the stance phase and for a quick return during the swing phase. Design parameters for the quick return crank mechanism were defined, and kinematic simulations were performed to understand the behavior of the mechanism. To evaluate the design, an experimental instrument was fabricated, and the cycling motion was analyzed. The results indicated that this new drive system can stabilize the center of mass of the user. This study can contribute to the development of a stand-up bicycle that allows for more comfortable leg kinematics.
클리키 스위치 조작 시 피드백의 명확성을 정량화 하기 위한 햅틱프로파일 분석
형준호(Joonho Hyeong),김사엽(Sayup Kim),노종련(Jongryun Rho),이재환(Jaehwan Lee) 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.1
Objective: This study aims at investigating the physical factors associated with feedback clarity when operating a clicky switch by analyzing haptic profile. Background: The operating feeling has become more important in PUI. Previously, many studies on the effect of physical parameters of controller on the affective experience have been conducted. The preferred physical parameters such as peak force, stroke and friction has been revealed already in many studies. But there are few quantitative studies on the feeling of feedback clarity which plays an important role in improving the operating feeling. The clarity is a haptic feedback to notify the user if the controller was operated successfully. To investigate the appropriate level of clarity and to improve operating feeling, the quantitative indicators that associated with the perceived clarity needed to be revealed. Method: The reaction force and stroke are measured when a clicky switch was pressed in a constant and voluntary speed. The constant operation was conducted by linear actuator and the voluntary operations were conducted by five human subjects. Each subject was operated 20 times and haptic profile which consists of the force and the stroke was measured. Based on haptic profile, change rate of the force and stroke was further analyzed to extract the acceleration and the rate of force. Results: The reaction force and stroke changed drastically at a time when passing through click section and the acceleration and the rate of force were increased prominently and instantly at that moment. The acceleration can be suggested for physical factor that associated with feedback clarity because the acceleration directly activates a mechanoreceptor called Pacinian corpuscles in human skin. Conclusion: It is understood that the increased peak acceleration associated with the feeling of clarity. The further empirical studies on the preferred acceleration and level of clarity are needed in application area. Application: The results contribute to the design of haptic feedback on the PUI.
형준호(Joonho Hyeong),노종련(Jongryun Roh),김사엽(Sayup Kim) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.11
사무용 의자는 착석자의 자세 변화에도 지속적으로 척추를 지지해 주는 것이 필요하다. 본 연구에서는 등판 기울임 시 요추전만과 흉추후만 이라는 자세변화를 능동적으로 지지하는 의자의 등판 굴곡메커니즘을 개발하였다. 연속적으로 배열된 다관절 링크의 동기화된 회전을 가능하게 하는 기본 원리를 파악하여 굴곡메커니즘 개념을 제시하였다. 제시된 개념안에 대해 동역학 해석을 통해 관절간의 회전량과 힘 전달특성을 분석하였다. 최종적으로 기어드 힌지(geared hinge) 타입의 메커니즘을 적용하여 등판 굴곡메커니즘을 설계하고 시작품을 제작하였다. 동작분석장비를 활용하여 등판 기울임 시 굴곡량을 측정하여 설계안을 검증하였다. 본 연구에서 제시한 연속적 굴곡메커니즘은 인체의 자세변화에 대응하여 능동적으로 지지해 주는 인체지지 제품 개발에 활용될 수 있을 것으로 기대된다. The human spine requires continuous support even though a postural changes have occurred in office chairs. This study develops a flexion mechanism for backrests to actively support lumbar lordosis and thoracic kyphosis during back reclines. The basic mechanism for the synchronous rotation of continuously joined linkages is investigated, and three types of flexion mechanism are proposed. Kinetic simulations are performed to analyze the rotation angle and the force on each pivot joint. A flexion mechanism that uses a geared hinge type is adopted, and a prototype chair is manufactured. The designed flexion angle was validated using a three-dimensional (3D) motion analysis system when reclining the backrest. The proposed continuous flexion mechanism is expected to be widely applicable to human support systems, resulting in body postural changes.