The geometry of triple friction pendulum seismic isolator surfaces was hypothetically changed from spherical to elliptical and force–displacement equations were derived for all motion stages. The effect of changing the elliptical surface diameters on the force–displacement diagrams and the amount of dissipated frictional energy was also investigated for separate hypothetical cases. According to the diagrams obtained from the sliding stages, the behaviour of isolators with elliptical surfaces in medium and large displacements is completely non-linear and can provide the possibility of achieving special performance for this range of input excitations to the structure.

中文翻译：

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具有椭圆形表面的三重摩擦摆式隔振器的循环特性

假设三摩擦摆地震隔离器表面的几何形状从球形更改为椭圆形，并推导了所有运动阶段的力-位移方程。对于单独的假设情况，还研究了改变椭圆形表面直径对力-位移图和耗散的摩擦能的影响。根据从滑动阶段获得的图表，在中等位移和大位移情况下，带有椭圆形表面的隔离器的行为是完全非线性的，并且可以为该结构的输入激励范围提供实现特殊性能的可能性。