Class Notes (811,170)
veldhu (9)
Lecture

# L05 - Basic Elements - Mass and Damping.pdf

2 Pages
126 Views

School
McMaster University
Department
Mechanical Engineering
Course
MECHENG 4Q03
Professor
veldhu
Semester
Fall

Description
Lecture 5 - Mass and Damping Mass or Inertia Elements – Assumed to be a rigid body that can undergo changes in kinetic energy – Depending on the model chosen, different parts factor into the mass – Masses often appear in combination - consolidate into a single mass – Mass can have energy •Potential energy when held in gravity •Kinetic energy when moving Inertia Properties of a Mass Damping Elements – In real systems, the vibrating energy dissipates into heat and sound – This reduction in system energy reduces the amplitude of response of a system – The mechanism by which this occurs is known as damping (coefficient is ‘c’) • Three types of damping – Viscous Damping (Primary focus in this course) F  CX  – Damping due to the resistance offered by the fluid in which the system operates – Example: fluid flow through an orifice (shock absorber) – Magnitude of damping force in a real system depends on many different factors - Therefore hard to estimate damping over time F  N – Coulomb/Dry Friction Damping – Damping due to friction between rubbing surfaces that are dry – Highly nonlinear (consider stiction) – Could consider constant in magnitude but changes with direction F  k X – Material/Solid/Hysteretic Damping  – Damping due to friction between internal planes in a deformed material – Could be a function of the driving frequency W  4  X Modeling of damping •One approach is
More Less

Related notes for MECHENG 4Q03

OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Join to view

OR

By registering, I agree to the Terms and Privacy Policies
Just a few more details

So we can recommend you notes for your school.