West Coast Magnetics发布了噪声屏蔽变压器。该产品能够消除电源的反射噪声,适用于为敏感的生产设备供电电源进行调节。该产品具有机架固定底盘,带有ON/OFF开关的紧急机械关断电路,带有断电上锁标记的ON/OFF断路器,从侧面向后部...West Coast Magnetics发布了噪声屏蔽变压器。该产品能够消除电源的反射噪声,适用于为敏感的生产设备供电电源进行调节。该产品具有机架固定底盘,带有ON/OFF开关的紧急机械关断电路,带有断电上锁标记的ON/OFF断路器,从侧面向后部的强制风冷,1MHz时抑制噪音80dB,100MHz时抑制噪音50dB,1000MHz时抑制噪音40dB。展开更多
We exploit theoretically a class of rectangular cylindrical devices for noise shielding by using acoustic metamateriais. The function of noise shielding is justified by both the far-field and near-field full-wave simu...We exploit theoretically a class of rectangular cylindrical devices for noise shielding by using acoustic metamateriais. The function of noise shielding is justified by both the far-field and near-field full-wave simulations based on the finite element method. The enlargement of equivalent acoustic scattering cross sections is revealed to be the physical mechanism for this function. This work makes it possible to design a window with both noise shielding and air flow.展开更多
基金Support by the National Natural Science Foundation of China under Grant Nos. 10604014 and 10874025by Chinese National Key Basic Research Special Fund under Grant No. 2006CB921706
文摘We exploit theoretically a class of rectangular cylindrical devices for noise shielding by using acoustic metamateriais. The function of noise shielding is justified by both the far-field and near-field full-wave simulations based on the finite element method. The enlargement of equivalent acoustic scattering cross sections is revealed to be the physical mechanism for this function. This work makes it possible to design a window with both noise shielding and air flow.