Modelling a spring system with damping force and external forces

  • #1
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Homework Statement
I know for a system with no external forces there are conditions for being underdamping, overdamping and critically damped. Is there also such conditions for systems having external forces acting on them also? Specifically, for the example 10y''+9y"+2y'=-2e^(-t/2) with conditions y(0)=0 and y'(0)=0, is the system critically damped?
Relevant Equations
10y''+9y"+2y'=-2e^(-t/2)
I think its critically damped by looking at the graph of the solution.
 
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  • #2
Can you give an example of a system with no external forces that exhibits damping and a system with external forces that also exhibits damping? I do not understand your use of "external force" at least not in the Newtonian sense.

Also, if 10y''+9y"+2y'=-2e^(-t/2), why not 19y''+ 2y'=-2e^(-t/2)? Is there a real difference between y'' and y"?
 

1. What is a spring system with damping force and external forces?

A spring system with damping force and external forces is a physical system that involves a spring, which provides a restoring force, and damping force and external forces, which act to resist the motion of the system. This type of system is commonly used in physics and engineering to model the behavior of objects that oscillate or vibrate.

2. How is a spring system with damping force and external forces modeled?

A spring system with damping force and external forces is typically modeled using a mathematical equation known as the spring-mass-damper system. This equation takes into account the mass of the object, the stiffness of the spring, the damping coefficient, and any external forces acting on the system. It can be solved using techniques from differential equations to determine the motion of the system over time.

3. What is the purpose of including damping force in a spring system?

The purpose of including damping force in a spring system is to account for the loss of energy due to friction or other resistive forces. Without damping force, the system would continue to oscillate indefinitely, but in reality, the amplitude of the oscillations decreases over time due to the dissipation of energy. Including damping force allows for a more accurate and realistic model of the system.

4. How do external forces affect a spring system with damping force?

External forces can have a significant impact on the behavior of a spring system with damping force. These forces can be either constant or time-varying and can act to either increase or decrease the amplitude of the oscillations. The type and magnitude of the external forces will ultimately determine the motion of the system.

5. What are some real-world applications of a spring system with damping force and external forces?

A spring system with damping force and external forces has many real-world applications. It can be used to model the behavior of a car's suspension system, the motion of a pendulum, or the vibration of a guitar string. It is also commonly used in engineering and design to analyze and improve the performance of structures and machines that experience oscillations or vibrations.

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