The design concern table below indicated the different criteria and requirements based on our survey and American Society of Mechanical Engineers (ASME).
Requirement: The minimum value that the design must achieved.
Design Concern Categories | Design Concerns | Assessment Measures | |
Definition | Requirement | ||
Physical | Lightweight | Weight (lbs) | |
Maximum Extended Height | Height (in) | 20 | |
Maximum Collapsed Height | Height (in) | 12 | |
Doesn’t Sink into semi-hard surface | Base Surface Area (in.^2) | ||
Top Plate Size | Area (in.^2) | ||
Structural | Adequate Strength | Compression loading [1], ASME PASE 6-4.1.2 (lbs.) | 4000 |
Adequate Stability | Off-center compression loading [2], ASME PASE 6-4.1.1 (lbs.) | 2000 | |
Environmental | UV Resistance | Strength retained following 72 hours (3 days) of UV exposure (ASTM G154, followed by ASTM D3410) (%) | 95 |
Water Resistance | Strength retained following 72 hours (3 days) of water submersion (ASTM D3410) (%) | 95 | |
Human Engineering | Ease of Use | Time to adjust height (mins) (Related measure: number of steps to adjust height) | |
Life Cycle | Warranty | Warranty Life [3] (yrs) | 1 |
Price | Affordable | Cost plus profit margin of 20% ($) | 175 |
Definition:
[1] Compression loading:
[2] Off-center compression loading:
[3] Warranty life:
The warranty life specifies the time frame in which the manufacturer or seller commits to repair, replace, or address any defects or problems that arise with the product, typically without any additional cost to the consumer.