1.2 Related Work and State-of-the-Art
For machining processes, there is a lack of system-level models and mathematical
tools to understand variation propagation so as to support fully integration of design,
manufacturing, and quality improvement. As such, the tolerance stackup is not wellunderstood
at design stage. The lack of models describing the overall machining
processes also imposed a large constraint on developing advanced diagnostics for
manufacturing. Statistical Process Control more focuses on manufacturing process
monitoring, as opposed to balanced studies on process monitoring and fast root cause
identification. As a result, a large number of iterative design changes and human
interventions are required due to a poor system response to uncertainty.