Proc. SPIE. 9446, Ninth International Symposium on Precision Engineering Measurement and Instrumentation
KEYWORDS: Phase shifting, Sensors, Error analysis, Field programmable gate arrays, Telecommunications, Signal processing, Signal generators, Dynamical systems, Information operations, Voltage controlled current source
The mechanical phase shifting method is often used to evaluate the accuracy of transmission error (TE) testing system, but the application scope of the mechanical phase shifting method is limited. This paper designed a new type of TE signal generator. Firstly, based on the principle analysis of the mechanical phase shifting method, the relationship between angle error from mechanical phase shifting and pulse signal of sensor is established, and then according to the TE’s synthesis formula we can obtained two displacement sensor signals which are used to replace real mechanical phase forming a special TE signal generator. The signal generator is composed of FPGA and ARM. The TE detection system is used to test the signal generator, after analysis, the error of the TE signal generator is 0.1%, which shows that the TE signal generator can be used to assess accuracy of TE system instead of the mechanical phase shifting method.
To realize the design of dynamic acquisition system for real-time detection of transmission chain error is very important to improve the machining accuracy of machine tool. In this paper, the USB controller and FPGA is used for hardware platform design, combined with LabVIEW to design user applications, NI-VISA is taken for develop USB drivers, and ultimately achieve the dynamic acquisition system design of transmission error
An appropriate model is established to analyze angular displacement error in machining process of linear cutting
machine in paper. Analysis results are as follows: as the radius of machining decreases, the angle errors become larger.
For the same radius of machining, the increasing angular indexing causes increasingly larger indexing error. When θ is
45 degree, indexing error reaches the maximum, and after 45 degree, indexing error begins to reduce. In order to
improve the indexing accuracy of internal gear machining and automation level, full closed-loop numerical control
system of linear cutting machine with high precision for internal gear machining is designed. The whole system consists
of three parts including molybdenum wire automatic measurement and compensation system, hollow rotary table-type
intelligent time grating sensor and control system of linear cutting machine. Here the time grating sensor provides angle
information feedback for full closed-loop control system. The experimental results demonstrate that the linear cutting
machining of internal gear is realized with full-automatic, high-precision and low-cost.