It is of important significance to study the vibration characteristics and vibration suppression technology of aero-engine rotating blades to improve the engine performance, structural integrity and working reliability. The development about experiment of vibration and response for rotating blade with dry friction damper is summarized. Device, excitation method and dynamic characteristic method used in vibration test for rotating blade with dry friction damper are discussed emphatically. Experiment of vibration and response for rotating blade with dry friction damper are divided into two types: non-rotating test and rotating test. According to present situation of experiment of vibration and response for rotating blade with dry friction damper, new research directions are suggested as follows: establishment of test equipment model library, which according to the different ten on structure and angle of adjacent blade; exploring the coupling loading method for high frequency and measuring method of vibration response; investigation on excitation method more in line with real environment, developing the high resolution measure method of vibration by using the strain gauge and sensor.

Rotating blades are key components in aircraft engine, the vibration characteristics and vibration reduction technology is rather important for engine performance, structural integrity, and work reliability. The dry friction damping structure is most widely used in all kinds of blade vibration suppression method. Firstly, the dynamic modeling and development of the rotating blade dry friction damper are described in detail. Then, the analysis method and development status of the damping characteristic of the dry friction damping structure for rotating blades are introduced. Finally, four types of models are introduced, including blade-ground and blade-blade models based on different structure, dry friction damping mathematical model based on Coulomb law of friction, dry friction damping contact model based on contact point, and dry friction damping contact model based on the relationship of relative motion, so as to provide theoretical and technical support for the modeling design, improving reliability and efficiency of rotating blade damping structure, and reducing vibration and prolonging life.

研究航空发动机蜂窝夹层声衬结构在强噪声和低温结冰环境下的动态特性,以及温度循环、声衬几何参数对声衬结构振动特性的影响,设计了三个声衬结构试验件.应用温度循环、结冰和强噪声耦合加载方法,得到了不同温度条件、不同厚度的未注满水的声衬结构的受迫振动特性,试验结果对研究航空发动机进气道实际工作环境下的声衬结构的抗振/抗结冰性能具有重要的参考价值.

Based on sheet bending theory ,the dynamic characteristics of a cantilever sheet were studied by the beam function combination method .Considering the centrifugal force ,the obtained ana-lytical solutions of frequency and mode shape might be applied to cantilever sheet .The theoretical foundation of the frequency and mode shape research on cantilever sheet were obtained .A new method of investigation of frequencies veering was presented .The obtained frequency and mode shape solu-tions are rather practical for the blade fatigue detection .

Large aspect ratio unmanned aerial vehicle ( UAV ) with low stiffness increases the supporting difficulty.The integration technology of phase resonance and phase separation has applied to study the influence of additional mass and additional stiffness on the test result.The research result has been applied in a certain UAV,and the test quality and efficiency have been improved.

One set of metal wire net isolator was developed and tested for airborne equipment, which included three models. Load and exciting frequency of airborne equipment was checked in three directions. Natural frequency and stiffness of metal wire net isolators was determined. Non-symmetry gravity center arrangement of the metal wire net isolators was designed. Dynamic characteristic and durability test result showed that the wire net isolators can restrain resonance effectively, which have better damping and broadband frequency isolating effects;the isolation efficiency is 81%. It was concluded that the wire net isolator can be used as vibration isolator of airborne suspension system.