An operational modal analysis technique is applied on sequential vibration measurements to characterise the dynamic behaviour of the rolling tire.

工作模态分析技术应用于连续的振动测量轮胎的滚动来表征的动态行为。

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The effect of the rolling tension stress on the natural frequencies of the circular saw is discussed and the criterion to evaluate its dynamic behaviour is proposed.

从理论上探讨了圆锯片受适张度应力作用时固有频率的变化规律，提出了合理的圆锯片辊压适张度评价准则。

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"They are coming closer, collecting food, rolling over, even allowing petting - in some instances the behaviour is more dog-like than fox-like, " says Dr Roger Mugford, an animal psychologist who runs the Animal Behaviour Centre.

BBC: Who, What, Why: Are urban fox numbers rising?