Research on the influence of ambient temperature on the performance of laser launching two-axis turntable

The laser emission two-axis turntable is a device that takes the turntable as the main body, carrying the laser transmission and emission functions. The turntable is required to have good performance in the temperature range of −40-55 ℃. To better understand the impact of ambient temperature on the performance of the turntable, the structure of the laser emitting two-axis turntable was introduced, and the finite element method was used to analyze and study the static and dynamic characteristics of the turntable under different ambient temperatures. The effect of the ambient temperature on the accuracy of the shafting was obtained from the result of the deformation of the turntable after the static analysis. According to the analysis, under the condition of 22 ℃ turntable performance parameters as the benchmark, within the temperature index range, at room temperature 22 ℃, the static characteristics of the turntable and the shafting accuracy were the best. The farther the ambient temperature deviated from 22 ℃, the worse the static characteristics and shafting accuracy. When the temperature changed by 10 ℃, the maximum deformation of the turntable changed by about 0.529 mm, and the maximum stress value changed by about 18.418 MPa; the verticality error between the azimuth axis and the pitch axis changed by about 4.715″, and the verticality error between the azimuth axis and the base support surface changed about 4.649″; Azimuth shaft system wobble error changed about 0.22″, pitch shaft system wobble error: (1) The temperature was below 22 ℃, the change was about 0.33″; (2) The temperature was above 22 ℃, the change was about 0.569″. When changing with temperature, the first 6 modal frequencies of the turntable had different laws, but the frequency change rate did not exceed 2%. The analysis results show that the ambient temperature has a greater impact on the static characteristics and shafting accuracy of this type of turntable, but has a small impact on the dynamic characteristics. The conclusion is consistent with engineering experience.