Research on Automatic Detection System of Statistics in the Machining Error Analysis

The research is to automatically testing and analyzing machining accuracy for the finished product by Pneumatic Measuring technology including the technology of data acquisition and the theory of disposition of data .To build a feasible system to analyze the machining error using Pneumatic measuring instrument to measure the parts by sensor to change the atmospheric pressure. A data acquisition card is used to gather and save the data. By programming software to write internet applications to statistical analysis for data, draw normal distribution figure, scatter diagram and histogram. To analyses the graph gains estimate the machining error and improve the performance for machine. By the experimental tests verify the feasibility and validity of the system.

The Research on Red Light Ranging Float Pneumoelectric Conversion Technology

This document explains how to transform an ordinary float-type pneumatic measuring instrument by adding a right lights sensor on it. Then we design a suitable float for it through the theoretical calculation and the simulation with Fluent. At last, the research do a series of experiments and by the experiments, its nonlinear error is less than the ordinary float-type pneumatic measuring instrument. So the whole instrument is feasible. The final purpose of designing the float-type pneumatic measuring instrument based on the red lights sensor is to measure the overlap of the valve core & sleeve of the slide valve.

Design of a Spool Valve Overlap Value Pneumatic Measuring System Based on Constant Pressure Control

Pressure type pneumatic measuring is the most wildly used method in overlap value testing, which depends strongly on the constant pressure of gas supplying. However,control of pressureisrarely done before.This paper presentsa design of a new overlap value measuring system with pressure control sub-system, mechanical platformand a program-controlled sub-system. A hybrid controller is developed combined with fuzzyself-adjusting PID and time-optimal control. The final version of this controller is a computationally efficient analytic scheme suitable for implementation in thereal-time closed-loop pressure digitalcontrol. At last, the system control software developed on LabVIEW is briefly introduced.

The Pressure Gas Line Characteristic Curve Shape Based on Origin

Honing pneumatic measuring systems are widely used in pressure gas line now, and pressure gas line characteristic curve is the theoretical design basis of differential pressure gas line, drawing and analysis differential pressure gas line characteristic curve is an essential link. Based on Origin powerful graphics capabilities; you can quickly and easily draw the pressure gas line characteristic curve.

Measurement System for Non-Cylinder Pin Hole of Piston

Aim to the low measuring precision of non-cylinder pin hole using the coordinate measuring machine(CMM)and pneumatic measuring instrument, a new solution is proposed which use the high-precision digital lever probe to detect the contours of pin hole with a single clamping situation. The measuring principal of non-cylinder pin hole of piston is introduced and the functions and measuring processes of the measurement system are also presented. The software modules are given and the probe centering error and the parallelism movement error are discussed detailedly. A measuring example is given in the end. The measuring results show that the measurement system has the ability to detect the contours of pin hole with high-precision and efficiently.

Turbomachinery Flow Measurements Using Long-Nose Probes

The present work provides a detailed account of a pneumatic measuring technique appropriate for flow field measurements in turbomachinery configurations, making use of long-nose 5-hole probes. The way of obtaining flow quantities in a frame of reference on the sensing head of the probe is first addressed. Transformation of velocity co-ordinates from the probe frame to a stationary frame, customary for turbomachinery flows, is then discussed. Sources of error are also discussed, with particular attention on those that can be introduced by the nose geometry and the co-ordinate transformations. The potential of the measuring technique is demonstrated by presenting the application of the technique for measurements in an annular cascade facility. The results are compared to results obtained by a 3-D Laser-Doppler Anemometer.