P13032: Adjustable Bench for Sailing

Detailed Design

Table of Contents

In Detailed Design Phase, the concepts, design ideas, and customer requirements were consolidated and a final system design was developed to be executed in MSDII. Special attention was given to each subsystem structure and how they interact to make the system work. Here we expand on the work and documentation.

Engineering Analysis

Shear Calculations on bolts securing the handles to the track platform are done to make sure the bolts can withstand the impact load of 1349 lb (worst case scenario).

Deflection Calculations of the track platform are used to later determine the moment created on the seat support arm.

Crank Axle Stress Analysis which is used to determine the appropriate diameter and material choice for the component.

Lower pulley axle analysis looks at stresses experienced by the lower axle due to belt tension and a load of 150 lb.

Upper pulley axle looks at stresses experienced by the upper axle due to belt tension.

States of Loading (courtesy of P12031) explain and calculate the worst case loading that will be experienced when sailing.

Crank arm calculations look at the forces exerted on the bolts supporting the crank arm as well as their factor of safety.

Anthropometric Data

To determine the correct direction and range of adjustment that the system must have, anthropometric data was gathered. It was decided that the 95th percentile male dimensions and 5th percentile female dimensions would be used to accommodate approximately 90% of the population. These percentiles are based off the ANSUR Database. Richard Ramos' body dimensions were found to be within this range, as expected, as well as the dimensions for an "average" 6'3" individual, which is Richard's height. The relevant measurements for this analysis are shown here.

The final range and location of adjustment for our system can be found here.

The dimensions collected by team P12031 can be found here, as well as the overall measurements for Richard's custom-made seat, available here.

Ergonomic Analysis & Recommendations

Bill of Material (BOM)

A Bill of Materials, including raw materials can be found here. This assessment includes a cost estimate for this design and is used to make sure the build will remain under budget.

Test Plan and Results

In order to quantify successes of this project, a plan for testing each engineering specification was made. This test plan and the results can be found here.

Manufacturing Drawings

The entire system was modeled in CAD using SolidWorks 2011. All CAD models can be found here.

Dimensioned component drawings that were used for manufacturing and assembly can be found below. They are organized based on the subsystem they belong to. These drawings reflect the most recent revision of the design.

Assembly Components
Hand Crank Assembly Components
Seat Weldment Assembly Components
Foot Rests Assembly Components
Pedestal Base Assembly Components
Tiller Strut Assembly Components
Tiller [ N/A] Components
Track Platform Assembly Components

Assembly & Manufacturing Plan

A detailed plan of how the system will be manufactured & assembled can be found here.

Detailed Design Review

Detailed Design Review Presentation that is presented at the meeting is also available for review.

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