在动态子结构修改方法的基础上，建立了车身结构的低噪声优化设计模型。
An optimization model for low noise design of an automobile body structure is developed based on the dynamic substructure modification method.
本文根据海洋噪声场随机局部谱展开理论，分析了典型浅海负梯度(或负跃层)下低噪声信道的理论模型。
Based on the theory of the local spectrum of ambient-sea noise field, theoretical models of the low-noise-channel for typical shallow-water negative gradient (or thermocline) are developed.
建立了漏斗型MCP的数学模型，给出了降低MCP的噪声因子及提高电流增益的理论依据，为低噪声mcp进一步的工艺研究打下了基础。
A mathematic model of funnel MCP is built. The theoretical evidence of reducing noise figure and improving the current gain is given. It will provide a theory foundation for further craft research.
分析了低噪声沥青混凝土路面降低轮胎噪声的机理，建立低噪声沥青混凝土路面的声学模型，用亥姆霍兹共振器模型分析计算了声波的共振频率。
The mechanism for low noise asphalt pavement to lower tyre noise is analyzed. A acoustical model is put forward. The resonance frequency of sound wave is analyzed with Helmholtz resonator model.
同时，建立了电荷泵锁相环频率合成器噪声模型，为高阶、低噪声电荷泵锁相环频率合成器的设计提供理论依据。
The noise model CPPLL frequency synthesizer is also established in order to provide theory of designing high order, low noise and high performance CPPLL frequency synthesizer.
同时，建立了电荷泵锁相环频率合成器噪声模型，为高阶、低噪声电荷泵锁相环频率合成器的设计提供理论依据。
The noise model CPPLL frequency synthesizer is also established in order to provide theory of designing high order, low noise and high performance CPPLL frequency synthesizer.
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