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Engineering
Mechanical Engineering
Exploring the Benefits of Planar Multibody Dynamics in Mechanical Engineering
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[QUOTE="jrmichler, post: 6622009, member: 638574"] Few practicing mechanical engineers ever perform analytical analyses of multibody dynamic mechanisms. Most dynamic mechanisms simplify down to a servomotor or crankshaft moving a load. Most of those cases are solved by first calculating the position, velocity, and acceleration vs time. Components are sized to meet requirements of stiffness, inertia, and strength. Peak drive torque is calculated, and the drive is sized. More advanced problems require an understanding of torsional natural frequency, and calculating an appropriate motion profile. Dynamic mechanism typically also require calculating the total system inertia reflected to the drive motor. I had one job where the best solution used a four bar linkage driven by a servomotor. I wrote a Matlab program to plot the output motion, and used that program to iteratively design the linkage. The peak acceleration was twice the peak acceleration of a similarly sized crankshaft, which was all the necessary information to size the parts. After sizing the servomotor, it was built, started up, and it worked. Durability testing resulted in several redesigns to improve bearings and mounting of change parts. Simulating motion is the easy part. The challenge is in designing and building something that actually works in the hands of a customer, and keeps working. [/QUOTE]
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Exploring the Benefits of Planar Multibody Dynamics in Mechanical Engineering
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