直升机桅杆式稳瞄具振动环境测试分析

对某直升机桅杆式稳瞄具振动环境进行实际测试，设计体积重量与真实稳瞄具完全相同的模拟件和测试设备（IMU）。分别进行25 m悬停和160 km/h前飞条件下的测试飞行，测试结果表明25 m悬停状态下，振动最小；随着前飞速度增加，振动加剧；测试结果还表明振动环境中不但存在线振动，而且也存在角扰动。测试结果对稳瞄具的前期设计和地面试验提供准确的原始输入数据。

Test and Analysis of Vibration Environment of Helicopter＇s Mast Mounted Sight

In order to test the vibration environment of helicopter’s mast mounted sight （MMS）, the test equipment IMS（inertia measurement unit） and the MMS model which have the same size and weight as the real MMS are designed. Tests of25 m hovering flight, 120 km/h forward flight and 160km/h forward flight for the helicopter are conducted. The results showthat vibration of the MMS model is the smallest in 25 m hovering flight state. With the forward speed increasing, thevibration is intensified. There exist both line vibration and angle vibration in the vibration environment of the MMS. Theresults have supplied the primary input data for preliminary design and ground test of the MMS.