Quiz - Time Integration | ANSYS Innovation Courses

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Question 1 of 10

1. Question
What is the purpose of time integration?
- 1) Solve problems in a coupled space-time domain
- 2) Solve problems in time domain
- 3) Solve problems in frequency domain
- 4) None of above
Question 2 of 10

2. Question
What is the benefit of explicit time integration?
- 1) More effective for highly nonlinear problems
- 2) No need to inverse stiffness and mass matrices
- 3) No need to perform equilibrium iterations
- 4) All of the above
Question 3 of 10

3. Question
Why initial conditions are required for dynamic analysis?
- 1) Required by time integration method
- 2) Define deformation and stress status at initial time, i.e., time = 0
- 3) By default, all bodies are at rest, unconstrained, and stress free
- 4) All of the above
Question 4 of 10

4. Question
Which of the following statements is NOT true?
- 1) Using rigid body dynamics reduces the computational time significantly
- 2) For quasi-static simulations, generally implicit time integration methods are used
- 3) Implicit time integration always gives more accurate results than explicit time integration
- 4)Generally explicit time integration methods are used when simulating a car crash test
Question 5 of 10

5. Question
Which of the followings is NOT required in Explicit Dynamics analysis?
- 1) All bodies must be constrained so no rigid body motion can occur
- 2) Initial conditions
- 3) Every material has density
- 4) Yield stress should be defined for all materials
Question 6 of 10

6. Question
In order to satisfy time integration stability, which one of the followings is required in Explicit Dynamics analysis?
- 1) Use high-order elements
- 2) Use low-order elements
- 3) Time step must satisfy CFL condition
- 4) Apply fixed support boundary condition
Question 7 of 10

7. Question
What is mass scaling used for in Explicit Dynamic analysis？
- 1) Increase the mass of some elements to increase the time step
- 2) Fix bad element ratio
- 3) Reduce running time
- 4) Increase the mass of all elements to increase the time step
Question 8 of 10

8. Question
Which of the following statements is true?
- 1) Rigid body dynamics does not need mesh
- 2) Explicit time integration is not suitable for long-duration problems
- 3) Implicit time integration needs to solve force convergence at each time step
- 4) The time step needs to satisfy CFL condition for both explicit and implicit time integration
Question 9 of 10

9. Question
Which statement is true about CFL condition?
- 1) An explicit dynamics simulation goes unstable when CFL condition is violated
- 2) It controls the maximum time step
- 3) It is inversely proportional to Young's modulus
- 4) All of the above
Question 10 of 10

10. Question
Compared to Implicit Dynamics, a rigid body dynamics simulation:
- 1) Needs smaller time steps
- 2) Is easier to converge
- 3) Generally requires less computational time
- 4) All of the above

Quiz - Time Integration

Quiz - Time Integration

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