本文以1:10钢桁架桥梁模型为研究对象,用有限元模型及实验模型进行局部损伤的识别,实验采用锤击法及变时基(VTB)技术对桥梁模型进行了模态分析。识别表明,通过曲率模态的变化可明显识别结构的损伤部位,取得了很好的识别效果。
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试验采用了新技术,一、弹性聚能力锤延长了力的激励时间,使激励力的能量聚集在低频处;二、使用了变时基(Varied-Time-Base)传递函数模态分析方法,极大提高了大型结构的传递函数的分析精度,从而使锤击法进行大型土木结构的模态试验成为可能.
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提出了基于变时基短时傅里叶变换来分析和处理时变信号的技术。
Measuring and analyzing technology based on variable-time-interval Fourier transform was dealt with for vehicle accelerating noise signal.
对五轴联动铣床采用锤击脉冲激励法和变时基采样方法进行实验模态分析,获得机床的各阶固有频率、振型及其相应的振型动画。
The experimental modal analysis of five-axis linkage milling machine is made by using hammer-hitting pulse-inspirit method and change time based sampling method.
Nel说,当我们变老时,由于氧自由基对免疫系统的影响,导致系统免疫防御和免疫监视能力下降。
"As we age, the ability of the immune system to fight disease and infections and protect against cancer wears down as a result of the impact of oxygen radicals on the immune system," Nel said.
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