passive noise control technique 被动噪声控制技术
Perilous rock is one of main geologic disasters in mountain area of China. Safe net system is a passive control technique for rockfall in recent years.
危岩是我国山地一种主要地质灾害类型，拦石网是近年应用的一种落石柔性被动防护系统。
The results indicate that passive control technique can reduce peak Mach number on the surface of the airfoil and reduce the adverse pressure gradient, shock is also weakened.
结果表明，被动控制使得沿模型表面的马赫数峰值及过压力梯度明显减小，激波减弱。
Depending on the degree of safety to achieve structural control technique like active isolation, passive isolation or conventional seismic design method can be chosen.
依据所要达到的安全程度，可选择采用主动隔震结构控制技术、被动隔震结构控制技术或传统的抗震设计方法。
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