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- 주제어 : Constant Accelerated Motion (검색결과 3 건)
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마이크로비트를 활용한 등속, 등가속 운동 실험 도구 개발
최기영 ( Choi Gi-young ),정용욱 ( Cheong Yong Wook ) 경상대학교 교육연구원 2023 현대교육연구 Vol.35 No.2
본 연구는 최근에 주목받는 피지컬 컴퓨터인 마이크로비트를 활용하는 등속, 등가속 운동 실험 방안을 제안하였다. 등속, 등가속 운동은 물리학에서 중요한 주제로, 중, 고등학교에서 여러 맥락과 유형 수준에서 반복적으로 제시되는 실험이다. 본 연구에서는 마이크로비트와 RC카, 초음파 센서를 이용하여 등속, 등가속 운동을 구현하고 분석하는 실험방안을 탐색했다. 그 결과 RC카의 출력을 조절하는 방식으로 등속, 등가속 운동을 구현하였다. 또 RC카에 연동된 초음파센서로 측정한 운동 데이터가 무선 전송되어 컴퓨터에 저장되고, 이것을 엑셀 프로그램을 이용하여 분석하여 등속운동, 등가속운동을 판별하고 속도와 가속도를 계산하였다. 본 연구에서 제시된 등속, 등가속운동에 대한 새로운 실험방식은 수학, 정보 교과와 융합, STEAM 융합, 인공지능과 융합 등 다양한 융합 활동으로 활용될 수도 있다. This study proposed a new experiment concerning constant-velocity motion and uniformly accelerated motion by using the micro:bit, a physical computer that has recently attracted attention. Constant velocity motion and uniformly accelerated motion are important topics in physics, and are experiments that are repeatedly presented in various contexts and types in middle and high schools. In this study, we explored a new experiment to implement and analyze constant velocity motion and uniformly accelerated motion using micro:bit, RC car, and ultrasonic sensors. As a result, constant speed and constant acceleration motion were implemented by controlling the output of the RC car. In addition, the motion data measured by the ultrasonic sensor linked to the RC car was transmitted wirelessly and stored on the computer. This was analyzed using an Excel program to determine constant velocity motion and uniformly accelerated motion and calculate speed and acceleration. The new experimental method for constant velocity and uniformly accelerated motion presented in this study can be used in various convergence activities such as convergence with mathematics, or information subjects, STEAM convergence, and convergence with artificial intelligence.
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Modal Analysis of Constrained Multibody Systems Undergoing Constant Accelerated Motions
Park, Dong-Hwan,Yoo, Hong-Hee The Korean Society of Mechanical Engineers 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.7
The modal characteristics of constrained multibody systems undergoing constant accelerated motions are investigated in this paper. Relative coordinates are employed to derive the equations of motion, which are generally nonlinear in terms of the coordinates. The dynamic equilibrium position of a constrained multibody system needs to be obtained from the nonlinear equations of motion, which are then linearized at the dynamic equilibrium position. The mass and the stiffness matrices for the modal analysis can be obtained from the linearized equations of motion. To verify the effectiveness and the accuracy of the proposed method, two numerical examples are solved and the results obtained by using the proposed method are compared with those obtained by analytical and other numerical methods. The proposed method is found to be accurate as well as effective in predicting the modal characteristics of constrained multibody systems undergoing constant accelerated motions.
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2016년 9월 12일 M5.8 경주지진의 데미지 포텐셜 분석 및 내진공학 측면의 시사점
이철호,박지훈,김태진,김성용,김동관 한국지진공학회 2016 한국지진공학회논문집 Vol.20 No.7
This paper investigates seismic damage potential of recent September 12 M5.8 Gyeongju earthquake from diverse earthquake engineering perspectives using the accelerograms recorded at three stations near the epicenter. In time domain, strong motion durations are evaluated based on the accelerograms and compared with statistical averages of the ground motions with similar magnitude, epicentral distance and soil conditions, while Fourier analysis using FFT is performed to identify damaging frequency contents contained in the earthquake. Effective peak ground accelerations are evaluated from the calculated response spectra and compared with apparent peak ground accelerations and the design spectrum in KBC 2016. All these results are used to consistently explain the reason why most of seismic damage in the earthquake was concentrated on low-rise stiff buildings but not quite significant. In order to comparatively appraise the damage potential, the constant ductility spectrum constructed from the Gyeongju earthquake is compared with that of the well-known 1940 El Centro earthquake. Deconvolution analysis by using one accelerogram speculated to be recorded at a stiff soil site is also performed to estimate the soil profile conforming to the response spectrum characteristics. Finally, response history analysis for 39- and 61-story tall buildings is performed as a case study to explain significant building vibration felt on the upper floors of some tall buildings in Busan area during the Gyeongju earthquake. Seismic design and retrofit implications of M5.8 Gyeongju earthquake are summarized for further research efforts and improvements of relevant practice.
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