【摘要】 研究了通过扭转橡皮筋作为驱动力的"发动机"的能量存储与输出.根据观察定义了橡皮筋形变的多阶缠绕,在此基础上建立模型模拟了橡皮筋解旋的能量输出过程.定义了该发动机的各项参量,包括总的旋转时间、有效旋转时间、效率等,探究了能量的分布情况.实验结果表明:橡皮筋发动机的大部分能量转化为螺旋桨的动能和空气动能.更多还原

【Abstract】 The properties of a rubber band motor,a toy motor that stores mechanical energy in a twisted rubber band and releases the energy through an aircraft propeller in an unwinding process,was systematically studied.The strain energy stored in the winded band was converted into three parts:kinetic energy of air,kinetic energy of propeller,frictional dissipation of propeller.For each one of them,a mathematical model was built to account for its contribution to the motor performance.Particularly,configurations of a twisted rubber band were classified into three types:the primary winding,the secondary winding and the tertiary winding.Various properties revealed by the experiment were clarified by our theory.更多还原