Experiment and Computer Simulation of Coupled Pendulum

身の回りの材料を使用して,連成振子の振動を定量的に記録する実験例を示した。2個のおもりの底面にフェライト円板磁石を取り付け,円筒コイルの上で振動させると,おもりの速度に比例する誘導起電力を検出することができ,2現象のX-Tレコーダに導くことにより,刻々の振動の様子を記録することができる。更に,各部の糸の長さ及びおもりの質量比が全く一般的な場合の連成振動の解析解を提出し,実験と同一の条件下でコンピュータ・シミュレーションを行ない,実験結果と比較検討した。An experiment in which the oscillation of coupled pendulum is recorded quantitatively was carried out. In the system of coupled pendulum consisting of two single pendulums 1 and 2, both the pendulums were at rest initially. The pendulum 1 was moved suddenly with a certain velocity and was swung with some amplitude. After several periods of oscillation, the amplitude of pendulum 1 gradually decreased and the pendulum 2 started to swing. Thus, the initially given oscillation energy went to and fro between the two pendulums. A disk shape ferrite magnet was attached to the bottom of the weight of each pendulum and a cylindrical coil was mounted just under each pendulum. As the weight passed over the coil the induced electromotive force proportional to the velocity of the weight was detected by a 2-phenomenon X-Y recorder. Furthermore, the analytic solution for the most general case was presented and its numerical simulation under the same condition as the experiment was compared with the experimental result