Problems regarding nonlinear natural vibration of pendulum spring 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。
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。
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.
安全气囊的传感器的设计有很多种，有一部分是采用摆锤或杠杆式开关，还有的是弹簧负载的转轮式，此外还有用水银开关的产品。
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