大展弦比柔性机翼的结构动力学特性试验研究  

Experimental Study on Structural Dynamic Characteristics of Flexible High-aspect-ratio Wings

作　　者：付志超[1] 仲维国[1] 陈志平[1] 朱振宇[1] 吕计男[1] 刘子强[1] 贾永清[1] 

机构地区：[1]中国航天空气动力技术研究院,北京100074

出　　处：《航空学报》2013年第9期2177-2184,共8页Acta Aeronautica et Astronautica Sinica

基　　金：部级项目~~

摘　　要：针对大展弦比柔性机翼尺寸大、轻质、低频、柔性等特点,为了避免传统模态测试的缺陷,提出采用车载运动条件下的环境激励方式进行机翼结构动力学特性试验研究,并初步建立了大展弦比柔性机翼的结构动力学特性测试技术。试验测试过程中,分别采用加速度计和光纤光栅(FBG)应变传感器测量经过优化的测点的结构响应,并利用特征系统实现算法(ERA)和随机子空间(SSI)法分析结构响应数据。结果表明两种方法的辨识结果均与有限元(FEM)计算结果相接近,加速度的辨识结果和FBG应变传感器测量的结果相一致。这验证了大展弦比柔性结构动力学特性车载试验方案的可行性,同时验证了FBG应变传感器应用于此类测试的有效性。A novel truck-mounted test scheme is proposed to research the structural dynamic characteristics of a large span high-aspect-ratio wing with the features of large-scale, lightweight, low-frequency and flexibility. To overcome the defects of the traditional modal test approach, an ambient vibration test method with optimized measuring locations is adopted to inves- tigate the structural dynamic characteristics. Therefore a structural dynamic test method for flexible high-aspect-ratio wings with large-scales is established in this study. Both acceleration sensors and fiber Bragg grating （FBG） strain sensors are employed to measure the structural responses during the field test. The eigensystem realization algorithm （ERA） and sto- chastic subspace identification （SSI） method are then applied to extract modal parameters from the measured data of accel- eration and strain response. The identified results show that both the ERA and SSI method results agree well with the finite element method （FEM） result, which demonstrates the feasibility of the truck-mounted scheme for structural dynamic testing. Meanwhile, the agreement between the acceleration result and strain result verifies the validity of the application of FBG strain sensors to structural dynamic testing.

关 键 词：大展弦比机翼 模态试验 车载测试 环境激励 特征系统实现算法 随机子空间法 BRAGG光纤光栅 应变 测量 

分 类 号：V216.24[航空宇航科学与技术—航空宇航推进理论与工程] TB122[理学—工程力学]