Set Final Specifications
Final Engineering Specification
The table below presents the metrics, or engineering specifications, and short comments on the team assessment of the attainability of the engineering goals.
|1||System Efficiency||1||%||60||85||100||Unlikely||Calculated system efficiency <<60%|
|2||Unique Impeller Designs||1||Piece||3||3||Likely||Approximately 8 Designs|
|3||Unique Diffuser Designs||1||Piece||2||2||Likely||2 Designs|
|4||Unique Volute Designs||1||Piece||1||2||Likely||1 Designed|
|5||Create System Pressure Differential||2||PSI||5||10||15||Likely||Calculated >5psi|
|6||Rotational Speed||3||rpm||1750||1750||1750||Likely||Already Achieved|
|7||System Top Height||2||in||42||45.15||48||Likely||Design is 46.75in.|
|8||System Center Line Height||2||in||40||42||44||Likely||Design is 41.75in.|
|9||Withstand Operational Stress||1||FOS||2||4||Likely||Analysis suggests|
|10||Pump Contains System Pressure||1||FOS||2||5||Likely||Calculation >2|
|11||Ability to Control Motor Speed||2||rpm||+/- 1||+/- 1||+/- 1||Likely||Already Achieved|
|12||Ability to Control System Flow||2||in||+/- 0.1||+/- 0.1||+/- 0.1||Likely||Already Achieved|
|13||Measure Flow w/ GUI||2||Binary||Yes||Yes||Yes||Likely||Already Achieved|
|14||Measure Pressure Differential w/ GUI||2||Binary||Yes||Yes||Yes||Likely||Already Achieved|
|15||Measure Motor Speed w/ GUI||2||Binary||Yes||Yes||Yes||Risk||No Connection|
|16||Measure Motor Current w/ GUI||2||Binary||Yes||Yes||Yes||Risk||No Connection|
|17||Control System Flow w/ GUI||2||Binary||Yes||Yes||Yes||Likely||Already Achieved|
|18||Control Motor Speed w/ GUI||3||Binary||Yes||Yes||Yes||Risk||No Connection|
|19||LOS for PIV||1||Transmissivity||75%||85%||100%||Likely||Approximately 92% before machining|
|20||Tool Clearance||1||in||0.25||0.45||2.0||Likely||2in in design|
|21||Impeller Change-Out Time||1||min||0||5||10||Likely||Previous team performed in <10. The new design has measures to further reduce the time.|
|23||Withstand drop from 42in.||1||Binary||Yes||Yes||Yes||Risk||Current Impeller is ok|
|24||Assembly w/o Power Tool Requirement||3||lbf||0||2||7||Likely||Required no excessive force to assemble/disassemble|
Meeting Specifications SummaryThe project is highly likely to meet 19/24 target specifications as outlined in the Table except Spec 1, Spec 15, Spec 16 , Spec 18 and Spec 23. Here, Spec 1 is a high priority specification; Spec 15 & Spec 16 are moderate priority and Spec 18 is low priority.
The team is highly unlikely to meet the requirements of Spec 1. The engineering analyses of the current designs show that the team is not in a position to achieve a level of efficiency between 60% and 100%. Furthermore, the team does not foresee any design changes in the volute, impellers or diffuser which will meet the target specification. If possible, the team will consult with the customer to revise the target specification based on the empirical results of the fabricated components.
The team is concerned about meeting Spec 15, Spec 16 and Spec 18 which deal with the interaction of the Graphic User Interface and the Motor Control Module. Therefore, measuring and controlling the motor parameters from the GUI is not currently possible. The team has added the required materials (DB9 to RJ45 adapter cable, Serial communication port replicator card) to the BOM and will begin repairing the GUI/Motor Control connection as materials become available. The team has planned to assign adequate time and resources to achieving these specifications and is moderately confident of success.
Spec 23 relates to the durability of the fabricated parts in order to withstand a drop from a height of 42 in. The current impeller survives a fall of such a height and thereby the team is confident that they will be able to meet the specification. However, the new impeller designs are more complex and intricate and thereby are a higher risk of damage. Therefore, the team is cautious about this specification.
For information on how the target specifications relate to the customer needs, please review the House of Quality documentation below: