Problems regarding nonlinear natural vibration of pendulumspring under foundation displacement excitation are studied.
研究基础位移作用下悬挂弹簧的非线性固有振动问题。
2
But you never had to make any small-angle approximation with the spring as we had to do with the pendulum.
但是你不用用弹簧，做小角近似值，就像我们用摆做的一样。
3
Airbag sensor there are many, in part, or leveraged by pendulum switch, there is the spring loaded wheel-style, in addition to products with mercury switches.