Predicting Transient Vibrations Using Ansys Mechanical - Lesson 2

Transient vibrations usually occur when a system is excited by a sudden, non-periodic excitation. The magnitude of such oscillations varies based on the type of excitation, and they occur at the system's natural frequencies. Examples include the impact of a baseball bat or cricket bat on a ball, non-destructive testing procedures, vibration monitoring techniques, and even the response of a building during an earthquake. The mode-superposition method is a good way to forecast how a structure will respond to various loads. Hence providing answers to queries related to the response's peak amplitude, timing, and time to decay. In this video lesson, we start with a short lecture and then get into a workshop example in Ansys Mechanical.
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01:15 - Transient Excitation
01:44 - Benefits of Mode Superposition (MSUP) Method
02:12 Limitations of Mode Superposition (MSUP) Method
02:48 Definition of Impulse Load
03:12 Transient Loading Types
03:30 Base excitation
03:40 Three ways to define MSUP Transient loads
04:05 Loads applied as Stepped
04:19 Loads applied as Ramped
07:12 Setup of MSUP Transient Analysis in Mechanical
08:47 Application of excitation force in Mechanical
10:21 Post-processing of Transient results

[@AnsysLearning]

This video is part of the free Ansys Innovation Course, 'Mode Superposition Transient Analysis Using Ansys Mechanical'. Access all the course contents including additional lessons, handouts, simulation examples with starting files, homework problems, and quizzes here: courses.ansys.com/index.php/courses/mode-superposition-transient-analysis/.

[@user-jk3cs4gu9c]

Hello, it's not entirely clear why you used sin^2 and not sin?

[@alinittos]

@@user-jk3cs4gu9c using sin function implies an alternating force, and this is not the case

[@HL1334]

@@alinittos In force function, when i enters Sin(wt) it says t is undefined, do you have any idea?

[@alinittos]

as far as I know, time variable has to be written as 'time' and not as 't'@@HL1334

[@worzel1983]

@@HL1334use the word time rather than t

[@tomasenrique]

Such a great video!

[@AnsysLearning]

Thanks for watching!

[@amiraboodi2075]

Very interesting.

[@gurjyotgahir3569]

amazing explanation

[@AnsysLearning]

Glad you liked it! Interested in more learning content? Visit Ansys Innovation Courses for free courses that include videos, handouts, simulation examples with starting files, homework problems, and quizzes here: ansys.com/courses

[@sujeet7741]

Grate Video sir, but can you provide me the source of that force time history formula.

[@AnsysLearning]

Thanks for watching! Please post your query on the Ansys Learning Forum for a detailed answer from the wider Ansys Community: ansys.com/forum.