为了研究用含分数阶导数描述的液力惯容器的非线性隔振系统特性,建立无量纲动力学模型.在无阻尼控制时,通过对比力传递率特性指标讨论参数对隔振系统性能的影响.结果表明分数阶惯容器能够反映液力式惯容器的多相特性,既有惯性作用又有一定阻尼作用,相比整数阶惯容器在隔振效果上有一定优势,但同样不能有效抑制非线性效应.在忽略非线性项的前提下,考虑系统含分数导数的特殊情况,详细介绍分数阶临界阻尼设计过程.仿真试验结果表明,所设计临界阻尼可以保证系统在自由振动时单调递减,而且考虑非线性项后,相比整数阶惯容器能够更好抑制非线性效应.

The propagation techniques of Sequoia sempervirens were explored based on the experiments in the consideration of cutting medium,hormone types,concentrations and time of treatment,and cutting position.5 kinds medium,3 types hormones,35 treatments were tested to seek the best way for cutting propagation of Sequoia sempervirens.The results indicated that medium had remarkable effect on the rooting ratio,with the combination of pearlite∶ Peat =7∶ 3 the best.Types of hormone,contents of hormone, as well as the treatment time had also obvious effect on the rooting ratio of Sequoia sempervirens cuttings.Quick dipping with(1000mg/kg) ABT was the best way for cutting propagation of Sequoia sempervirens.The results also showed that cuttings from different genotypes had significant differences on the rooting ratio of Sequoia sempervirens,indicating the possibility to select superior individual with good rooting ability.Therefore,choosing the optimal genotypes,combined with treatments as collecting cuttings from top fragment,quick dipping cuttings in(1000mg/kg) ABT and then cultured in medium of the combination of pearlite∶Peat =7∶ 3 would be the best way for cutting propagation of Sequoia sempervirens.