Mechanical Vibraton: Mass-Spring-Damper Model

[@berhanuabnet7438]

Thank you Dr. Azma PUtra. your videos are very amazing.

[@muhammadikhwanazizibinkhal7944]

thank you for sharing sir👍

[@omargamal665]

thank you

[@AzmaPutra-channel]

You're welcome

[@peter121philip]

Thanks! Your videos are amazing

[@mosesarchibong4619]

great work

[@jieweiyang4710]

thank you for sharing

[@AzmaPutra-channel]

My pleasure

[@MrFuadsama]

great work sir ..please keep up the good work ! =D

[@yassirmohd7830]

Good explanation Dr.Azma Putra.I would like to ask you about natural frequency and mode shape for MDOF( undamped) three impeller connected with shaft between two journal bearing,the weight of impellers are 200 kg,180 kg and 150 kg respectively and torsional stiffness (kt) is 644000 N/m. Could you provide me solution in more detail?

[@AzmaPutra-channel]

The analysis will be the same as the translational 3-DOF, but this case you have to treat it with rotational displacement. You can assume the stiffness of the shaft is uniform.

[@annr8391]

Sir, how is it that the soil can be modeled as a spring? The soil, unlike a spring or even the rubber, will not exert a force back on the system, will it? Or is this just based of an assumption of the soils properties. Conceptually it is confusing for me.Would it be possible to have a surface/material that damps but does not act as spring? Or is it that we assume any solid surface exerts an opposing/damping force? Thanks :)

[@AzmaPutra-channel]

+Ann Reina A certain type of 'soil'/ground has a spring-like behaviour plus its damping property. Engineers also model this when designing vibration of a building where the ground is assumed to have stiffness and damping properties. When you think of a ground to have type of soil like the one on the beach, yes, it acts more like a damping rather than a spring.

[@emmar2869]

Why only a small portion of the beam vibrating? I mean all the beam seems to vibrate by force transmitted by the mechine

[@AzmaPutra-channel]

Yes, indeed. All parts of the beam actually have vibration displacement. What we want is the stiffness at the location of where the motor is attached (which is at the middle of the beam). So we consider only the displacement at that specific location. If the motor is attached at a different location, the stiffness constant will have a different formula.

[@yassirmohd7830]

Thank you Dr.Azma.Thank you for your reply .Could you please resolve it in more details?. Thanks & regards

[@AzmaPutra-channel]

Hi Yassir. Could you elaborate it specifically?

[@somanathb9196]

Good sr tq

[@SIDE_AT]

What your country ?