论文部分内容阅读
针对压电振动除冰方法在工程上的可用性,以平面铝板为研究对象,采用有限元模型和结构动力学分析的方法,对平板压电除冰系统中压电元件的排布规律进行了研究。以平板长度方向上的截面为研究对象,用有限元分析方法研究了二维压电耦合模型的模态振型,选取了长度方向上三阶模态振型为最佳除冰模态振型,并以此振型为后续三维模型的基础振型。针对压电元件数量、压电元件相对贴片数量和压电元件贴片集中度这三个不同的排布参数,利用三维压电耦合有限元模型,以冰层与平板交界面处的弹性应变作为激励效果的直接体现参数,仿真分析了压电元件在平板宽度方向上的排布规律。仿真结果表明:压电元件在宽度方向上排布在中间位置和边缘位置,对结构均具有较好的激励效果,压电元件的布局要避开宽度方向上弹性应变较小的位置,因此对于分布在平板宽度方向边缘的压电元件,仍然可以在目标结冰区激励出较强的振动效果;在相同的接触面积下,减小压电元件的相对贴片数量,提高压电元件的贴片集中度,均可以提高压电元件对平板的激励效果,因此在实际应用中,在尺寸和粘接结构情况允许的情况下,尽可能选择尺寸较大的压电元件;并且当曲面上压电元件的贴片范围被限制的情况下,适当提升某一方向上压电元件贴片集中度,可以提高对平板结构的激励效果。灵活结合压电元件排布规律,可以设计出可行的压电元件排布方式,为压电除冰系统的工程研究提供借鉴和参考。
In view of the availability of the piezoelectric vibration deicing method in engineering, the planar aluminum plate is taken as the research object, and the law of arrangement of the piezoelectric element in the plate piezoelectric deicing system is studied by using the finite element model and structural dynamics analysis method . Taking the cross section in the length direction of the plate as the research object, the modal vibration modes of the two-dimensional piezoelectric coupling model are studied by means of finite element analysis. The third-order mode shape in the length direction is selected as the best mode of deicing mode , And use this mode as the fundamental mode shape of the subsequent three-dimensional model. According to the three different arrangement parameters of the number of piezoelectric elements, the number of patches on the piezoelectric element and the concentration of the patches on the piezoelectric element, the three-dimensional piezoelectric-coupled finite element model is used to calculate the elastic strain at the interface between the ice sheet and the flat plate As the direct embodiment parameter of the excitation effect, the law of arrangement of the piezoelectric element in the width direction of the slab is simulated. The simulation results show that the piezoelectric elements are arranged at the middle position and the edge position in the width direction, which has a good excitation effect on the structure. The piezoelectric element is arranged in a position avoiding the smaller elastic strain in the width direction, Piezoelectric elements distributed along the edge of the slab width can still stimulate strong vibration effect in the target freezing area. Under the same contact area, the number of relative patches of the piezoelectric element can be reduced to improve the adhesion of the piezoelectric element Therefore, in practical applications, the piezoelectric element with a larger size may be selected as much as possible under the condition of the size and the bonding structure. When the pressure on the curved surface When the range of the patch of the electric element is limited, the concentration of the patch of the piezoelectric element in a certain direction can be appropriately increased, and the excitation effect on the flat structure can be improved. Combining the arrangement of piezoelectric elements with the flexibility, we can design feasible arrangement of piezoelectric elements and provide references for the engineering research of piezoelectric deicing system.