- #1

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## Main Question or Discussion Point

Hi all,

For my final project at university, I am required to design a new swing arm for a Gs500 Motorcycle. I have come up with a C sectional concept when regarding the side beams and will insert X shaped reinforcement throughout the areas of less strength.

My main problem is inputting the model to FEA analysis. I am abit confused about what forces exactly are acting on the swingarm and where exactly they are applied. So far:

,

1. I have calculated the rear shock force and it's vertical/horizontal components. Would I be correct in assuming they act directly on the middle of the rear shock pivot?

2. I have calculated maximum acceleration as 9.54m/s^2 and the resultant force this acceleration generates. I am confused again on where exactly this load is acting on the swingarm?

3. I have calculated the forces from cornering at high lean angle and assume they would be acting somewhere around the midpoint where the two arms join but not sure where exactly?

Furthermore, I have heard about a lateral load and moment that acts upon the swingarm but have found no literature on how to calculate the values and again where exactly they are acting?

I was wondering if anyone could help me out; mainly with the positioning of everything perhaps on a FBD? Statics has always been one of my weak points and I cannot seem picture it all in my head.

For my final project at university, I am required to design a new swing arm for a Gs500 Motorcycle. I have come up with a C sectional concept when regarding the side beams and will insert X shaped reinforcement throughout the areas of less strength.

My main problem is inputting the model to FEA analysis. I am abit confused about what forces exactly are acting on the swingarm and where exactly they are applied. So far:

,

1. I have calculated the rear shock force and it's vertical/horizontal components. Would I be correct in assuming they act directly on the middle of the rear shock pivot?

2. I have calculated maximum acceleration as 9.54m/s^2 and the resultant force this acceleration generates. I am confused again on where exactly this load is acting on the swingarm?

3. I have calculated the forces from cornering at high lean angle and assume they would be acting somewhere around the midpoint where the two arms join but not sure where exactly?

Furthermore, I have heard about a lateral load and moment that acts upon the swingarm but have found no literature on how to calculate the values and again where exactly they are acting?

I was wondering if anyone could help me out; mainly with the positioning of everything perhaps on a FBD? Statics has always been one of my weak points and I cannot seem picture it all in my head.