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It is the brief description for understanding the free body diagram.
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Advanced Automatic Control Systems 04/3
T H E U N I V E R S I T Y O F L A H O R E
Cont. (Understanding FBD*)
To understand the direction of terms and forces, take the case of spring K2,
1. Assume at first that M2 is stationary and M1 is moving with a displacement of x1(t).
• This motion would cause K2 to compress generating a force K2 x1(t) in a direction opposite to x1(t).
2. Now assume that M1 is stationary and M2 is moving with a displacement of x2(t).
• This motion would cause K2 to elongate generating a force K2 x2(t) in a direction of x2(t).
𝑥𝑥1
𝐾𝐾2𝑥𝑥1(𝑡𝑡)𝑀𝑀1
𝐾𝐾2𝑥𝑥2(𝑡𝑡)
*FBD = Free Body Diagram
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