Qing Zou

Structures Analysis and Optimum Design of the Large Stroke Two-Axis Fast Tool Servo

A two degree of freedom large-stroke linear FTS device was designed in this paper, the device with flexible hinges as the guidance and support part, achieved the linear degrees of freedom in X and Z. In addition, structure design and optimizationanalysis of static characteristic and dynamic characteristicresponse surface analysis of FTS device were worked as well in this paper ,then the stiffness and strength characteristics of FTS device has been greatly improved, fully meet the design requirements, achieved the desired effect.

A winding machine for polarized wire grid of microwave radiometer calibration

Polarized wire grid has been used as a low-energy polarization separator in many calibration systems. A novel machine was developed for winding the polarized wire grids with different sizes and shapes. In this paper, the process of design including parameters calculation, structural analysis, and the calibration for the winding device is presented. Finally, taking an oval grid as an example, the fabrication and the testing results is shown. A 250u2009mm×350u2009mm oval polarized wire grid is fabricated by using this machine, with 0.1u2009mm diameter molybdenum wires at the distance of 0.3u2009±u20090.02u2009mm. And it achieved the 01. mm flatness requirement. The machine used is robust and can be easily extended to even 200u2009×u2009200u2009mm2 – 500u2009mmu2009×u2009500u2009mm grids with 0.08–0.2u2009mm diameter wires at the distance of 0.1–0.5u2009mm.

The Study of the Influence of Surface Geometric Error on Optical Properties

When machining optical part, the surface geometric error cannot be avoided and it can affect optical properties of optical part significantly. So it has far-reaching meanings to study the influence of surface geometric error on optical properties. Based on the evaluation indexes i.e. wavefront aberration, point spread function and modulation transfer function, this paper establishes a model of optical part only with surface error to study the influence of surface error on optical properties with a piece of ring curved lens. The study result indicates with the increment of surface error, the value of wavefront aberration increment increases. Moreover, the transfer capacity of demonstrating object contour decreases.

Multiresolution Representation of a Geometric Model for Free-Form Surfaces Turning Based on Mesh Simplification

In this paper, a new multi-resolution representation (MRR) of a series of intermediate shape models for FTS diamond turning based on mesh simplification is proposed. In this MRR, geometric relations between each resolution model can be controlled so as to avoid overcut and to level the cutting loads. The new control method for MRR is based on an improved Edge Collapse Algorithm with consideration of the curvature factor. In addition, the calculation method of machining allowance and tool path generation method are proposed to support the machining process. The effectiveness of the MRR has been verified through simulation.

Topology Optimization of a Radiometer Azimuth Turntable Based on Hyper Works

Topology optimization is a kind of optimization method to seek structure material optimum assignment according to loads, constrains and optimal object. Combining the topology optimization technology with the finite element technique, Hyper Works 10.0 software platform was used for the topology optimization design of a radiometer azimuth turntable in this paper. The mass, the natural frequency and the maximum equivalent stress of the optimized design were compared with the original design through the finite element analysis, research showed that, the mass of the turntable was greatly reduced and the structure stiffness was improved as well after the optimization. The lightweight design of the azimuth turntable had been realized in this paper, and the research had a great reference value for the engineering practice.

The Finite-Element Analysis of the Main Frame of the Airborne Photoelectric Platform

Because both of the volume and the weight of the photoelectric platform are small, the structure of two frames and two axes is used in the photoelectric platform. As the key component of the photoelectric platform, the main frame should have sufficient strength and rigidity. In order to achieve this object, three-dimensional entity model of the main frame is established using CATIA software. Then the finite-element analysis of the model is finished with ANSYS Workbench. Based on the analysis results, the weak links of the main frame is found. Then these links are improved and the main frame is analyzed again. After improving the structure, the results of the finite-element analysis show that the main frame meets the requirements of design and has perfect overall performance.

Random Vibration Analysis of the Deployable Structure for Satellite Antenna

In this paper, the random vibration theory based on the finite element is briefly described; the appropriate finite element model of the Deployable Structure for Satellite Antenna (DSSA) is created. In order to assess the random vibration characteristic and the performance of the DSSA in the dynamic environment, the responses of the DSSA are analyzed. The responses are obtained by the respective random vibration analysis of X, Y, and Z directions, and by the analysis of the root mean square and the power spectrum density of the acceleration response. The results show that, although the DSSA can bear the random vibration load, the structural weaknesses are existence. This provides some references to the formal design of the DSSA.