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2. Duhamel's integral - Wikipedia

   en.wikipedia.org/wiki/Duhamel's_integral

   where m is the (equivalent) mass, x stands for the amplitude of vibration, t for time, c for the viscous damping coefficient, and k for the stiffness of the system or structure.

3. Modal analysis using FEM - Wikipedia

   en.wikipedia.org/wiki/Modal_analysis_using_FEM

   The goal of modal analysis in structural mechanics is to determine the natural mode shapes and frequencies of an object or structure during free vibration.It is common to use the finite element method (FEM) to perform this analysis because, like other calculations using the FEM, the object being analyzed can have arbitrary shape and the results of the calculations are acceptable.

4. Logarithmic decrement - Wikipedia

   en.wikipedia.org/wiki/Logarithmic_decrement

   The logarithmic decrement can be obtained e.g. as ln(x 1 /x 3).Logarithmic decrement, , is used to find the damping ratio of an underdamped system in the time domain.. The method of logarithmic decrement becomes less and less precise as the damping ratio increases past about 0.5; it does not apply at all for a damping ratio greater than 1.0 because the system is overdamped.

5. Operational modal analysis - Wikipedia

   en.wikipedia.org/wiki/Operational_Modal_Analysis

   Implementation economy is one primary advantage of ambient vibration tests as only the (output) vibration of the structure needs to be measured. This is particularly attractive for civil engineering structures (e.g., buildings, bridges) where it can be expensive or disruptive to carry out free vibration or forced vibration tests (with known input).

6. Transient response - Wikipedia

   en.wikipedia.org/wiki/Transient_response

   Damped oscillation is a typical transient response, where the output value oscillates until finally reaching a steady-state value. In electrical engineering and mechanical engineering, a transient response is the response of a system to a change from an equilibrium or a steady state. The transient response is not necessarily tied to abrupt ...

7. Even before US alcohol warning, younger Americans were ...

   www.aol.com/news/even-us-alcohol-warning-younger...

   The U.S. Surgeon General's warning of an increased risk of cancer from drinking alcohol may end up resonating most with younger Americans - who in recent years were already turning to mocktails ...

8. Are NFL quarterbacks worth their high salaries? - AOL

   www.aol.com/nfl-quarterbacks-worth-high-salaries...

   Deshaun Watson - Contract value: $230 million - Career NFL record: 37-35 - Approximate career value: 63. A three-time Pro Bowler and the NFL's passing leader in 2020, Deshaun Watson sat out the ...

9. Complex harmonic motion - Wikipedia

   en.wikipedia.org/wiki/Complex_harmonic_motion

   In physics, complex harmonic motion is a complicated realm based on the simple harmonic motion.The word "complex" refers to different situations. Unlike simple harmonic motion, which is regardless of air resistance, friction, etc., complex harmonic motion often has additional forces to dissipate the initial energy and lessen the speed and amplitude of an oscillation until the energy of the ...