For an unmanned helicopter optoelectronic system,the external passive vibration isolation platform was designed and verified based on the Hexapod configuration.The dynamic model of the Hexapod vibration isolation platform was established,the parametric modeling of the platform was completed,and the theoretical analysis and simulation comparison of the digital prototype were carried out based on Adams and Simulink co-simulation to verify the accuracy of the modeling.The sweep frequency test and the line/angle coupling response test of the developed prototype were conducted.The results show that the natural frequency of the three-direction linear excitation of the vibration isolation platform is less than 8 Hz,which can realize the vibration attenuation of the main vibration frequency of the helicopter platform,and the RMS value of coupling angle swing response is less than 200 μrad.Finally,the field hanging flight test was completed,which verified that the engineering prototype of the vibration isolation platform met the operational requirements.

Photoelectric products in the military industry tend to be lightweight in design, requiring the part to be lightweight and have high specific strength. As one of the structural parts of photoelectric products, the thin-walled sleeve part has the peculiarity of lightweight and thin wall thickness. Nevertheless, the residual stress during machining processing poses an adverse effect on the accuracy of the parts. In this paper, the influence of residual stress on the accuracy of the parts during the processing was studied. Before fine machining, the residual stress was reduced by artificial aging techniques and ultrasonic beam control methods. Finally, the effect of the two stress relief methods was evaluated according to the qualified rate of the processing accuracy of the parts. The research results show that the axial residual stress of the part is larger than the circumferential residual stress. Both artificial aging techniques and ultrasonic beam control can eliminate residual stress, and the ultrasonic beam control method is more targeted and uniform.

机载光电稳瞄平台受飞机作战环境的干扰因素,会引起设备环架的振动,对光电平台载荷视轴的稳定性及跟踪精度影响很大,减振的主要任务是有效隔离环境振动.与传统橡胶减振器比较,文章提出了一种新型机载光电稳瞄平台的柔性减振设计.并通过ANSYS仿真软件对新的减振模型进行了模态仿真分析,通过振动试验对设计的性能进行了有效评估,测试结果与仿真评估误差为0.56％,说明该设计对机载光电稳瞄平台具有减振性.

Diffractive optical element (DOE) shows high diffraction efficiency and good dispersion performance, which makes the optical system becoming light-weight and more miniature. In this paper, the design, processing, testing, compensation of DOE are discussed, especially the analyzing of compensation technology which based on the analyzing the DOE measurement date from Taylor Hobson PGI 1250. In this method, the relationship between shadowing effect with diamond tool and processing accuracy are analyzed. According to verification processing on the Taylor Hobson NANOFORM 250 lathe, the results indicate that the PV reaches 0.539 micron, the surface roughness reaches 4nm, the step position error is smaller than lambda/10 and the step height error is less than 0.23 micron after compensation processing one time.

When processing optical barrel-like components with mass center drifting off rotary center and a big length-diameter ratio,the conventional processing method has several drawbacks such like the qualification rate is low,and it is difficult to ensure the geometric tolerance such as coaxiality of holes of both ends.The processing challenges were shown and the problems of its common used method were analyzed in the paper,meanwhile a novel method was presented.It is practically proved that the new method can ensure the accuracy requirements and enhance the qualification rate.

<正>引言由于光电研究所的产品、零件精度较高,结构复杂,因此进行数控加工时需用大量的软件编制的程序,在管理使用这些程序时由于设备或人员的原因经常出现影响生产的情况。为了有效避免操作失误,提高加工效率,

In the courses of production,we often meet the process of the axial style parts with exact symmetrical sliding grooves at both ends.It's a technology challenge in how to guarantee the machine accuracy of the axial style parts.This paper introduced a new technical method to process the parts high-effectively.This method break through the routine thought,and designs a specified frock clamp.It can settle for the problem such as the difficulty in installing the clamp and machining,the low process efficiency,the less finished product etc.For it simple operation and low price,this technology has an important practical significance for the production process,and it can also useful for small-scale and large-scale production.

In this paper,the high efficiency processing technology of a micro-sized and thin-walled parts that difficult-to-install in small volume was introduced,and this technology provides new operation ideas for the parts of same type.The main purpose of this paper is to solve problems which appear during the processing of special parts in small volume,such as high production cost on special tooling design,while efficiency is low and accuracy is difficult to guarantee by piece-by-piece processing mode.Solving method that put forward in this paper is as follows.Firstly,process fixtures are designed and installed in the appropriate position so as to simplify the clamping process.Secondly,the parts are manufactured in volume with CNC milling so as to improve processing efficiency,ensure the accuracy of the correct shape and size of parts.It has been proved that this process greatly improves the productive efficiency,and successfully solves the technical problems during the machining of the special parts in small volume.

This paper is mainly concerned about the machining of high-precision deep holes with small diameter in the cone of optical equipment.According to the characteristics and the technical requirements of the parts,the problems in the parts processing using the traditional method was analyzed and the method of WEDM-LS was selected to manufacture the parts.On the basis of the study on WEDM-LS characteristics and process specifications,by a large number of experiments,the effective processing measures and parameters were summarized.The processing result is satisfactory after tested by coordinates measuring instruments.In a word,these processing methods and parameters can be widely applied on other parts of similar materials and structures,and a new method for the processing of high-precision minor-diameter deep holes is brought up.