Back Section Analysis Software Introduction

• Topics

– Graphical User Interface

• User Information and Comments

• Inputs and Parameters

– Simulation

• Simulate Actuation and Emergency Release Buttons

– Analysis Tools

• Change Single Parameter Buttons

– Outputs

Graphical User Interface 1. User Information and Comments

1. Type any text you want displayed

2. Project, Chair Series, Date, Engineer, Comments

2. Parameters and Inputs

1. All Parameters and Inputs can be modified from GUI.

Simulation Buttons

1. Simulate Actuator Driving

1. Simulates the actuator pushing the back section up with all current parameters.

2. Note: the damper is not included in this calculation, considered negligible.

2. Simulate Emergency Back Release

1. Simulates the emergency back release being pulled with all current parameters.

2. Note: Actuator “Damping” force not currently included in calculation.

Simulation Results Graphs and Outputs

1. Simulate Actuator Driving

2. Outputs

3. Simulate Emergency Back Release

4. Undamped and Damped Impact Resultant Loads

5. Damper Force During Drop

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Inputs

Parameters

1. Damping Coefficient

2. Weight

1. Summation of Patient’s weight located on the back section

3. Actuator Hinge Spring Constant

1. Spring constant created by the seat weldment mount

4. Final Time

1. Approximate time to complete articulation

5. Actuator Force

1. Listed or tested maximum force

6. Horizontal and Vertical C.G.

1. Measure similar to back hinge

7. Initial angular velocity

1. Normally zero but can be edited

Outputs

1. Moment of Inertia

1. Calculated in program

2. Max Damp Force

1. The maximum force acting on damper hinges during emergency back release

3. Maximum Damped Impact Force

1. Maximum force acting on the actuator hinges once back has fully dropped with damper

4. Maximum Undamped Impact Force

1. Maximum force acting on the actuator hinges once back has fully dropped without damper

5. Total Time for Back to Drop With Damping

Actuator Driving Graph

1. Final Angular Position

2. Position with respect to time (blue)

3. Velocity with respect to time (red)

4. Initial Angular Position

Emergency Release Graph

1. Final Angular Position

2. Position with respect to time with damper (blue)

3. Velocity with respect to time with damper (red)

4. Position with respect to time with damper (black)

5. Velocity with respect to time with damper (green)

Resultant Loading Graphs

1. Undamped Impact Load

2. Damped Impact Load

3. Force applied to damper mount during emergency release

Single Parameter Change Graphs

1. Position with respect to time with damper (blue)

2. Velocity with respect to time with damper (red)

3. Single Variable Values

4. Time For Back to Drop

1. Displays total time for back to drop as calculated for all five parameters used

Note: The single parameter change graphs display the emergency back release graphs for five one-half in increments