心脏的杂音是血流通过可以使血液混合的缺损口时产生的涡流引起的噪音。
A heart murmur is simply a noise caused by the turbulence of blood flowing through the openings that allow the blood to mix.
根据涡流场计算结果并结合振动噪音分析，提出了改善母线桥工作噪音的措施，并对各项措施进行了数值模拟和实验研究。
After that, the improvement methods are proposed to reduce the noise, and the numerical simulations and experiments are performed to study every improvement method.
实验模拟，得到无噪音的部分模式的瞬时频率的关系和涡流频率。
Experimental simulation yielded the relation of the partial mode's instantaneous frequency and vortex frequency without noise.
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