WF23: Define Test Point

Pre-requisites

• PHM Module: Prognostics and Health Management (PHM) Module enables access to Test Point Editor.
• FBD Model: defined with functional flows and failure diagrams to be targeted by test point sensors.
• Sensor Data: includes sensor details, specifications and relevant performance to support PHM analyses.

Detailed Descriptions (numbered steps)

1. Access the Test Point Editor from the right-click context menu opened on target model item, in either the Project Explorer or System Model window.
2. Select checkbox to Enable Test Point and provide an optional description.
3. Allocate a sensor to test point by clicking and dragging the appropriate sensor from the Sensor Library and dragging it to the sensing target.
4. Define the Method of Sensing via the context menu opened on the allocated sensor.
5. Click the 'Edit...' button to edit Sensor Details.
6. Edit Parameters of the sensor, defined as Direct Entry or Measurement Based input values.
7. Edit any necessary Additional Sensor information.
8. Continue until all sensing targets of the Test Point are defined.
9. Test Point is defined with appropriate sensors and report with all relevant information may be generated.

Fields referenced in the diagram

• Enable Test Point: Description
• Allocate a Sensor to Test Point: Sensor Library
• Define Method of Sensing: On-line, In-line, Off-line, Test, Inspection
• Edit Sensor Details: Name, Part Number, Vendor, Vendor Number, Dimensions, Weight, Sensor Cost, Cost of Detection, MTTF, MTTR
• Edit Sensor Parameters: Probability of Detection, Specificity, ROC Curve Analysis..., True Positive, False Positive, True Negative, False Negative
• Edit Additional Sensor Information: Description, Detection Method, Signal Type, Operating Environment, Constraints

Decision points

• Test Point All Defined? — No → loop back to Allocate a Sensor to Test Point; Yes → Test Point Defined.

Outputs

• Test Point Report: A comprehensive report that includes a summary of built-in / legacy sensors, their details, specifications, cost and performance.

Screenshot walkthrough (captions/labels extracted)

Step 1: Access Test Point Editor

• Project Explorer right-click context menu on "Coupling" (under Vehicle System [4/29]): New, New Diagnostic Analysis, System Model, Failure Diagram, Functions, Test Point (highlighted), Diagnostic Analyses, Maintenance Actions, Cut/Copy/Paste, Delete, End Effect Item, Fault Tree, Response Paths, Override Failure Diagram, Failure Injection, Response Simulation, Save to Library, Advanced Properties.
• System Model viewer "Vehicle System": Mission Profile "Regular Trip", End Effect Item "Vehicle System". Diagram: Power Generation, Coupling (context menu open), Driveline, Vehicle nodes with flow arrows (IN/OUT). Context menu on Coupling: New Diagnostic Analysis, System Model, Failure Diagram, Bond Graph, Functions, Test Point (highlighted), Diagnostic Analyses, Maintenance Actions, Cut/Copy/Paste, Delete, Zoom In/Out, End Effect Item, Fault Tree, Response Paths, Propagate All..., Override Failure Diagram, Failure Injection, Response Simulation, Save to Library, Advanced Properties.

Step 2: Enable Test Point

• "Coupling - Test Point": left nav "Test Point". "Details": Enable Test Point checkbox (unchecked), Name "Coupling - Test Point", Description, Total Sensors "0", Total Weight "0oz". "Sensor Details": Name, Probability of Detection, Specificity, Edit... button. "Sensor Allocation" panel: "Coupling" — "Couple" / "Effort Source"; "Mechanical - rotational" row: Torque (checkbox). "Symptoms": "Change in performance", "Component: Coupling", Symptom Group: -, Narrative: "No narrative provided", "Failures: Couple Mechanical - rotational Torque". "Sensor Library" panel: Sample Sensor Library, New User Library; checkbox "Filter by selected Component."; "Recently Used Sensors" (empty).

Step 3: Allocate Test Point Sensor

• Two states shown. First: same layout with Sensor Library expanded (New User Library > Sample Category 2 > Rotary Transformer), Torque row shows a placeholder "Rotary Transformer" text (not yet dropped, greyed). Second: "Enable Test Point" checkbox now checked, Total Sensors "1", Total Weight "0.353oz"; Torque row now shows "Rotary Transformer" allocated (highlighted green); "Recently Used Sensors": "Rotary Transformer".

Step 4: Define Method of Sensing

• "Coupling - Test Point": Sensor Details Name "Rotary Transformer", Probability of Detection "100%", Specificity "100%", Edit... button. Sensor Allocation: Torque row with "Rotary Transformer" allocated, right-click context menu open: "Method of sensing" (submenu: On-line, In-line, Off-line, Test, Inspection), "Sensor Selection Optimization", "Sensor Details", "Delete". Sensor Library tree expanded showing Rotary Transformer under Sample Category 2. "Recently Used Sensors": Rotary Transformer.

Step 5: Edit Sensor Details

• "Coupling - Test Point" — "Sensor Details" panel: Name "Rotary transformer", Part Number, Vendor, Vendor Number, Dimensions "15.00 / 10.00 / 30.00" (Height/Width/Depth), Dimension Units "millimeters", Weight "10.0 grams", Description "" (edit icon). Right side: Operation type Automatic/Manual (Automatic selected), Detection Method Active/Passive/N/A (N/A selected), Signal Type Digital/Analog/N/A (N/A selected), Operating Environment, Constraints, MTTF "0.000 hours", MTTR "0.000 minutes", Sampling interval "0.000 minutes", Test duration "0.000 seconds". Tabs: Costs & Materiel (selected)/Parameters/Custom Properties. "Costs & Materiel": Acquisition Cost $3,500.00, Replacement Cost $0.00, False Alarm Cost $0.00, Detection Cost $0.35, Operational Cost $0.00/hr, Testing Cost $0.00/hr. "Personnel"/"Equipment" empty lists ("New personnel"/"New equipment" placeholders).

Step 6: Edit Sensor Parameters

• Same sensor details header. "Parameters" tab selected: "Inputs" — Direct entry (selected): Probability of Detection "100%", Specificity "100%", "ROC Curve Analysis..." button; Measurement based (unselected): True Positive, False Positive, True Negative, False Negative (blank). "Calculated Parameters": Probability of Detection 100%, Specificity 100%, False Negative Rate 0%, False Alarm Rate 0%, Positive Predictive Value N/A, Negative Predictive Value N/A, Accuracy N/A, Balanced Accuracy 100%, Likelihood Ratio Positive 0.00, Likelihood Ratio Negative 0.00, Matthews Correlation Coefficient N/A.

Step 7: Edit Additional Sensor Information

• Same layout, "Parameters" tab with "Measurement based" now selected: True Positive 0.0, False Positive 0.0, True Negative 0.0, False Negative 0.0. "Calculated Parameters": Probability of Detection 0%, Specificity 0%, False Negative Rate 100%, False Alarm Rate 0%, Positive Predictive Value 0%, Negative Predictive Value 0%, Accuracy 0%, Balanced Accuracy 0%, Likelihood Ratio Positive 0.00, Likelihood Ratio Negative 0.00, Matthews Correlation Coefficient 0.00.

Step 9: Component Test Points Defined

• "Test Point Report" for "MADe Training", "SENSOR DETAILS": Item "Coupling", System "Vehicle System", Total Cost $0.00, Total Weight 0g. "FAILURE MODE SENSORS" table (Test Point/Sensor/Vendor/Part Number/Cost/Cost of Monitoring/Weight/MTTF/Replacement Time/Dimensions): "Couple Mechanical - rotational Torque" / "Rotary transformer (Strain Gauge)" / — / — / $0.00 / $0.00 / 0g / 0.00h / 0.00s / (w: 0mm, h: 0mm, d: 0mm). "SYMPTOM SENSORS" table: "Change in performance" / "Sight [Sample Sensor]" / $0.00 / $0.00 / 0g / 0.00h / 0.00s / (w: 0mm, h: 0mm, d: 0mm).
• Second report page, "COST" section, "SENSOR PARAMETERS": Item "Coupling", System "Vehicle System", Total Cost $0.00, Total Weight 0g. "FAILURE MODE SENSORS" table (Test Point/Sensor/Method of Sensing/Source/Occurrence/POD/SPC/FNR/FAR/PPV/NPV/ACC/BACC/LRP/LRN/MCC): "Couple Mechanical - rotational Torque" / "Rotary transformer (Strain Gauge)" / On-line / Direct Entry / "Failure Prevalence 94.141" / 100% / 100% / 0% / 0% / 100% / 100% / 100% / 100% / 0.00 / 0.00 / 1.00. "SYMPTOM SENSORS" table: "Change in performance" / "Sight [Sample Sensor]" / Inspection / Direct Entry / "Failure Prevalence 94.141" / 100% / 100% / 0% / 0% / 100% / 100% / 100% / 100% / 0.00 / 0.00 / 1.00.

Related workflows

• WF24 – Generate Automated Sensor Sets
• WF25 – Generate User-defined Sensor Sets