Work-In-Progress Limits: Release Control Is Different from Buffer Space
Separate a system-wide work-admission limit from the capacities of individual physical waiting locations.
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Machine Guide Library — Page 26
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Resource Hold Intervals: Separate Manual Loading from Automatic Processing
Trace acquisition and release of a shared modeled resource around loading and automatic processing.
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Setup Amortization: Larger Lots Spread Setup Work Without Shortening Setup
Separate one setup per lot from repeated per-piece service when comparing fictional lot sizes.
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Petri-Net Enabling: Required Tokens Determine Which Transition Can Fire
Check a unit-weight Petri transition’s input tokens and update the marking after one defined firing.
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MTBF and Mission Reliability: A Mean Interval Is Not a Success Probability
Calculate a fictional exponential mission-survival probability while keeping the mean failure interval’s assumptions explicit.
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Resource Calendars: Integrate Capacity Across the Defined Shift Intervals
Sum time-varying resource capacity across explicit shift intervals to calculate scheduled resource-hours.
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Discrete-Event Simulations: State Changes Occur at Defined Events
Review a discrete-event model through its state transitions and event ledger rather than a smooth animation.
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Simulation Warm-Up: Empty-Line Transients Differ from Steady-State Estimates
Keep an empty-start transient and the chosen data-collection window explicit when reporting modeled long-run performance.
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Event Priority Ties: Define What Happens at a Shared Timestamp
Declare the event order for an arrival and departure sharing a timestamp so capacity handling is reproducible.
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Simulation Time Units: Keep the Delay Scale Consistent
Choose a time-unit convention and convert every delay before entering numerical simulation values.
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Queue Discipline: FCFS and Priority Change Who Waits
Compare individual waiting under an explicit FCFS or priority-based ready-job selection rule.
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Preemptive Service: Pausing a Job Needs a Defined Resume Rule
Specify priority-driven interruption, retained completed work and re-entry before modeling preemptive service.
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Multiple Resources: A Job Needs Its Required Capacities Together
Require all necessary resource units at the same time before treating a modeled job as eligible to start.
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Deadlock Cycles: Held Resources Can Prevent Every Next Step
Trace an exclusive-resource hold-and-wait cycle before calling a stalled model merely slow.
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Failure Exposure Clocks: Operating Time and Calendar Time Define Different Models
Compare a fictional operating-exposure clock with elapsed-time exposure while keeping the failure mechanism explicit.
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Schedule Feasibility and Optimality: State the Solver’s Actual Conclusion
Interpret feasible, optimal and unknown solver statuses only for the stated constraints and objective.
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Extensional and Shear Viscosity: Identify the Deformation Mode
Identify whether the relevant flow stretches the material or shears it before carrying one viscosity report into a different deformation question.
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Normal-Stress Effects and Die Swell: Separate Elastic Response from Simple Viscosity
Retain the emerging shape and deformation history when investigating die swell; a steady shear-viscosity number alone leaves elastic response unresolved.
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Start-Up Stress Overshoot: A Steady Flow Curve Leaves the Transient Unresolved
Retain the time trace immediately after shear begins; a later steady value cannot show whether the material passed through an earlier stress maximum.
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Creep and Recovery: Keep Applied Stress and Compliance History Together
Keep both the loading interval and the unloading observation when comparing creep and recovery; a final deformation alone does not describe the history.
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Stress Relaxation: A Fixed Deformation Can Have a Changing Force Response
Retain the imposed deformation while reading a changing stress trace; constant strain does not require constant stress in a viscoelastic material.
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Linear Viscoelastic Superposition: State the Small-Deformation Boundary
State the tested linearity boundary before combining responses to separate deformation increments into one viscoelastic prediction.
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Time-Temperature Superposition: A Shifted Curve Needs a Material-Region Basis
Check curve shape and material comparability before using temperature shifts to extend a measured viscoelastic time or frequency range.
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Particle Size and Rheometer Gap: Preserve a Representative Sample Geometry
Retain particle size beside the actual measuring gap when comparing suspension rheology; a confined region may not represent the intended bulk sample.
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