针对目前机载航空电子装备恶劣的振动环境以及对相位噪声全频段降噪的趋势，考虑晶振系统的机电耦合特性对其进行减振降噪机电综合优化设计。从晶振的工作原理出发，提出了一种新的晶振相位噪声振动恶化特征的物理表征方法。在此基础上，构建了以强度和质量等为约束条件、以各个工况下的相位噪声为优化目标的数学模型并求解。仿真计算和试验验证结果表明，该方法能够在高频段相位噪声不恶化的前提下大幅度改善低频段的相位噪声水平，取得了满意的结果，并且该方案将应用到工程实际中。

According to the current vibration environment of airborne avionics and the trend of the full band noise reduction on phase noise,considering the electromechanical coupling characteristics of crystal system for noise reduction of the electromechanical synthetic optimization design under vibration is useful. A new method of physical characterization of crystal oscillator phase noise and deterioration characteristics under vibration is put forward for the first time from the working principle of the crystal. On this basis,the mathematical model is set up to optimize the phase noise at various operating conditions with the strength and quality of the constraints. The simulation calculation and experimental verification show that the proposed method can improve the phase noise level at the low frequency in the condition of phase noise at high frequency without deteriorating. The paper has achieved satisfactory results,and the scheme will be applied to engineering practice.