【作者】 张胜；

【导师】 裘进浩；

【作者基本信息】 南京航空航天大学 ， 仪器科学与技术（智能监测与控制）， 2016， 硕士

【摘要】 随着国家航空事业的发展,其航空器内部的低频噪声问题日益受到重视。压电材料由于其良好的机电耦合特性和频响特性,已被广泛应用于结构振动噪声控制之中。在基于压电材料的控制方法中,同步开关阻尼技术的半主动振动方法具有系统简单、控制效果稳定、易于集成化的特点,能够满足航天等领域对高可靠性和轻量化的要求,得到了广泛的关注。本文基于同步开关阻尼半主动噪声控制方法,通过对结构的目标振动模态的控制,降低了系统的低频噪声辐射,有效得提高了被控结构的低频隔声性能。研究首先从薄板的声辐射理论出发,通过数值分析的方法分析了薄板系统的声辐射声性和系统的声辐射模态,从而确定了薄板结构辐射低频噪声的主要结构表面振速分布形式。其次,采用有限元分析软件Abaqus分析了薄板结构的振动模态,确定了驱动器分布的位置。并且在有限元仿真软件中实现了对结构的半主动振动控制仿真,验证了半主动控制方法在抑制表面目标振速方面的有效性。最后,针对薄板结构的隔声问题,搭建了半主动噪声控制系统。实验以单频噪声、混合双频和白噪声三种激励方式对结构进行激励,采用半主动控制方法对三种激励方式下的薄板辐射噪声进行控制。实验结果表明,系统能够适应各种激励形式,并且控制算法简单,鲁棒性较高,有效得提高了薄板结构的低频隔声性能。本研究在内容上扩宽了同步开关阻尼技术的半主动控制技术的应用范围。更多还原

【Abstract】 With the development of the national aviation industry, the aircraft interior low frequency noise has gained an increasingly attention from government and aerospace industries. Piezoelectric material has been widely applied in the vibration and noise control field for its excellent mechanical electrical coupling and frequency response characteristics. Among the control methods based on piezoelectric materials, semi-active control using synchronized switch damping method which can well meet the aviation weight and reliability requirements, due to its simple integrated system structure and stable control effect. This paper proposed a semi-active noise control method to improve the low frequency transmission loss of the aeronautical plate structures.Firstly, based on the theory of acoustic radiation of plate structure, the radiation characteristics and sound radiation mode of the plate system were analyzed by using numerical analysis method. Due to the numerical analysis results, the main forms of structure vibration distribution was determined.Secondly, the vibration mode and sound-vibration coupling problem of plate structure was analyzed by using finite element analysis software Abaqus. By using finite element dynamic analysis, the position of the actuator and the effectiveness of the semi-active noise control method is verified.Finally, a semi-active noise control system was built up to verify the proposed noise control method. The structure was excited by single frequency noise, dual frequency noise and white noise, semi-active noise control was applied to all the excitation conditions. The experimental results show that the system can adapt to various forms of excitations, and the control algorithm is simple and robust, and has effectively improved the low frequency sound insulation performance of plate structure. The proposed semi-active noise control method has successfully improved the low frequency transmission loss of plate structure and also broadened the application scope of the semi-active control method by using synchronized switch damping method.更多还原