Tyres used for vibration isolation
Fig. 18-8: Tyres used for base isolation (Courtesy of Professor B Zhuang, Zhejiang University, China)
Fig. 18-8 shows two tyres placed between the ground and a generator in a rural area of a developing country. The presence of the tyres reduced the natural frequency of the generator and moving it away from the operating frequency. Although the operators of the generator may not have known much about vibration theory, they knew from experience that the presence of the tyres could reduce the level of vibration.