The natural frequency and vibration mode are the principal modal parameters representing structure dynamic behavior as well as the important basis for evaluating bridge dynamic performance.
固有频率和振型是反映结构动力特性的主要模态参数，是评价桥梁动力性能的重要依据。
It also presents turning performance evaluating indices and a kind of drive mode which can improve turning performance.
提出了转向性能的衡量指标和一种改善转向性能的转向方式。
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