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A Complete Online Guide For Every Mechanical Engineers
Calibration: If a known input is given to the measurement system the output deviates from the given input, the corrections are made in the instrument and then the output is measured. This process is called
Failure Mode – A particular way in which an item fails, independent of the reason for failure. Failure Mode and Effects Analysis (FMEA) – A procedure by which each credible failure mode of each item
Errors in Measurement : Error = Measured Value – True Value Em = Vm – Vt 1. Absolute Error : True absolute error : = Result of measurement – True Value Apparent Absolute
CRITICALITY is a measure of the frequency of occurrence of an effect. – May be based on qualitative judgement or – May be based on failure rate data (most common) Qualitative analysis: –Used when specific
It is defined as the probability that a given system will perform it’s function adequately for it’s specified period of lifetime under specified operating conditions. Common measures are : 1. Failure rate. 2. Mean time
MEASUREMENTS: A Measurement is the outcome of an opinion formed by observers about some physical quantity. CLASSIFICATION OF MEASUREMENTS: Standards – ( Reproduce the value of given quantity ) Fixed Gauges – (Check Dimensions) Measuring