MSA测量系统分析报告.pptx

Introduction: Where does the variation of measurement system come from?
• The Five Characterizations of Measurement System: 1. Location Variation: Bias; Stability; Linearity Stability(Alias: Drift): Stability is the total variation in the measurements obtained with a measurement system on the same master or parts when measuring a single characteristic over an extended time period. A stable measurement process is in statistical control with respect to location.
Introduction: What are the variations of measurement process
Measurement(Observed) Value = Actual Value + Variance of The Measurement System
σ σ σ 2
2
2
obs = actual + variance of the measurement system
• Base on QS9000 & TS16949 requirements, all measurement system which were mentioned in Quality Plan should be conducted Measurement System Analysis.
MSA Requirement
7)
3) SIGNAL DETECTION THEORY
8)
4) LONG METHOD
3) ACCEPTABILITY CRITERIA 4) CONCLUSION 5) FOUR METHODS COMPARISON
Introduction: Basic requirements by QS-9000 & TS16949
Introduction: The category of Measurement System
• Most industrial measurement system can be divided two categories, one is variable measurement system, another is attribute measurement system. An attribute gage cannot indicate how good or how bad a part is , but only indicates that the part is accepted or rejected. The most common of these is a Go/No-go gage.
Training Material for
MEASUREMENT SYSTEM ANALYSIS
Contents :
1) INTRODUCTION FOR MEASUREMENT SYSTEM ANALYSIS
2) GENERAL METHODS ILLUSTRATION FOR
MEASUREMENT SYSTEM ANALYSIS
Introduction: Where does the variation of measurement system come from?
• The Five Characterizations of Measurement System: 1. Location Variation: Bias; Stability; Linearity Bias is the difference between the observed average of measurements and a reference value. Bias is often referred to as accuracy. It is a systematic error component of the measurement system
1) VARIABLE GAGE ANALYSIS METHOD
2)
1) THE AVERAGE-RANGE METHOD
3)
2) THE ANOVA METHOD
4) ATTRIBUTE GAGE ANALYSIS METHOD
5)
1) SHORT METHOD
6)
2) HYPOTHESIS TEST ANALYSIS
General Process
Input
Process to be Managed
Operation
Output
Measurement Process Value
Measurement
Analysis
Decision
Introduction: What are the variations of measurement process
Variable Gage
AHale Waihona Puke Baidutribute Gage (Go/No-go Gage)
Introduction: What is a measurement process
Measurement: The assignment of a numerical value to material things to represent the relations among them with respect to a particular process. Measurement Process: The process of assigning the numerical value to material things.