002114 sas ip inc 1126 vm53 stress psi modal f1 hz

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ments (BEAM3) Spring-Damper Elements (COMBIN14) Structural Mass Element (MASS21) Input Listing: vm52.dat Test Case An automobile suspension system is simplified to consider only two major motions of the system: • up and down linear motion of the body • pitching angular motion of the body If the body is idealized as a lumped mass with weight W and radius of gyration r, determine the corresponding coupled frequencies f1 and f2. Figure 52.1 Automobile Suspension Problem Sketch Material Properties E = 4 x 109 psf w = 3220 lb m = W/g = 100 lb-sec2/ft k1 = 2400 lb/ft k2 = 2600 lb/ft Geometric Properties 1 = 4.5 ft Loading g = 32.2 ft/sec2 = 5.5ft r = 4 ft 2 Analysis Assumptions and Modeling Notes The beam geometric properties are input (all as unity) but not used for this solution. The torsional moment of inertia IT is calculated as IT = Wr2/g = 1600 lb-sec2-ft. A lateral master degree of freedom (MDOF) and a rotational MDOF are selected at the mass. The spring length is used only to define the spring direction. ANSYS Verification...
View Full Document

This note was uploaded on 12/09/2010 for the course DEPARTMENT E301 taught by Professor Kulasinghe during the Spring '09 term at University of Peradeniya.

Ask a homework question - tutors are online