The Studing And Implementation For Radome Precision Measuring Technology Of Supporting Grinding

The accuracy of missile attacking target largely depends on radome electrical thickness on surface,and there are many factors which can influence the accuracy of electricity thickness,such as radome wall thickness,material dielectric constant,electromagnetic incident angle,the wavelengths and so on.Research shows that it is possible only changing radome wall thickness to compensate the deviation of electricity thickness.In this paper,the following aspects are studied with the ceramic active homing missile radom of complex surface as study project.First,the study of coversion relationship among radom electrical thickness,geometric thickness,and IPD(insertion phase delay)Among radome electrical performance parameters,electrical thickness is one of the important parameters.It reflects the radom combined electrical performance effects form dielectric constant,radome wall thickness,IPD etc.The changes of electrical thickness form electricmagnetic waves through the radome will leads the loss of the antenna gain,the changes of beam width,beam offset,and side-lobe level elevation.Therefore electrical thickness is a very important indicator of charactering the radome electrical performance.It not only affects radome transmission efficiency,but also affects radome aiming error.The chapter is the study of researching the relationship among electrical thickness,geometric thickness,IPD,and their respective measuring principles and methods.That will provide necessary theoretical guidance for grinding radome.Secondly,the study of the amount of forecast grinding and the technology measuring amount of actual grinding on lineThe electrical performance of the surface of the radome are generally non-compliance after semi-finishing.According to the study of the relationship among electrical thickness,geometric thickness,and IPD form previous section,it is known that it can be achieved compensating electrical performance indicators by grinding the surface of the radome.However,how much of the amount of grinding are needed which meet the accuracy requirements of the finished product is a difficult point of the study.In this chapter,it will be relatively accurate predicited to the amount of grinding by using the combiniation of VB(Visual Basic)and Neural network,based the calculation tool of MatLab.It will be obtained to the amount of actual grinding by measuring the surface of radome before and after processing on line,and compared with prediction grinding.If the error is within the allowable range,stop grinding,otherwise continue to grinding.This section introduces a system of on-line measuring and grinding based on Keyence Sensor of LK Series,and analyzis their feedback relationship of measuring data and the corresponding NC(numerical code).Finally,the study of process of radome grinding and corresponding simulationWith the advantages of good thennal shock resistance,small thermal expansion coefficient,temperature stability and low dielectric constant,Fused-Silica is a excellent material for manufacturing radome.However,due to its low elastic modulus,high hardness and brittleness,it is not allowed to use grinding fluid in the process of grinding to not affect the performance of the radome.Therefore the method of dry grinding is applied in the process of finishing.The section analyzies and researches the related grinding process which can affect the quality of the radome machining.