Estimate the natural frequency and damping factor, Computer Engineering

On the Moodle site just below the assignment you will find data from a slow sine sweep test conducted on a car on a "four-post" road simulator for the frequency range 0 to 20 Hz in the EXCEL spreadsheet "Ride_Comfort_Data".   The response has been measured vertically on the seat rail of the driver's seat while the front two actuators moved up and down in phase and the rear actuators remained at rest.  The amplitude of the actuator motion was such that the velocity amplitude was constant throughout the frequency sweep at 100 mm/s.  The response amplitude at the seat rail is measured in g.

(a)  Obtain the transmissibility between the input motion of the actuators as a single input and the motion of the seat rail.  Provide a graph from EXCEL showing the transmissibility.

(b)  The transmissibility in (a) does not tend to 1 at low frequency as might be expected for an ideal one degree of freedom system.  Explain this.

(c)  Estimate the natural frequency and damping factor for the sprung mass mode involving motion of the body on the front suspension.

(d) If the diameter of the front tyres of the car is 0.6 m estimate the car speed in kph which would cause an "engine shake" problem in the car.  (This will require you to identify the frequency for the engine shake mode from your graph.)                                           

(e)  In road tests on a relatively flat test track surface at 80 kph with one front wheel deliberately unbalanced, the idle shake at the seat rail position, measured using an accelerometer, was 4.2 g rms.  The other three wheels were in almost perfect balance.  What displacement amplitude and frequency of the front two actuators of the road simulator would be necessary to achieve the same seat rail motion in the laboratory?                                                                                                                         

Posted Date: 3/13/2013 4:02:04 AM | Location : United States







Related Discussions:- Estimate the natural frequency and damping factor, Assignment Help, Ask Question on Estimate the natural frequency and damping factor, Get Answer, Expert's Help, Estimate the natural frequency and damping factor Discussions

Write discussion on Estimate the natural frequency and damping factor
Your posts are moderated
Related Questions
For two stages network the switching elements for M inlets with r blocks and N outlets with s blocks is given by (A) Ms + Nr                                (B)  Mr + Ns (

Which approaches do not require knowledge of the system state? Ans. Deadlock detection, deadlock prevention and deadlock avoidance; none of the given require knowledge of the s

Q. Explain Bus Interface Unit? BIU (Bus Interface Unit) mainly interacts with system bus. It executes nearly all the activities relating to fetch cycle like:  Computing

Mr. Franco Forest owns a small lawn care business with three employees. He owns the lawn mowers, rakes, and weed whackers that are housed in a storage area at the back of his home.

Evidence of intelligent behavior - Artificial Intelligence: Machines mean they could simply be personal computers, or they could be robots with embedded automative systems, or

A distributed workstation cluster must be viewed like single computing resource and not as a group of particular workstations'.  Details of cluster were: 150MHz R4400 workstatio

END DIRECTIVE: ENDS directive ends a segment and ENDP directive ends a procedure and END directive ends whole program which appears as last statement. ASSUME Directive:   An .

Parameters are like script variables. They are used to vary input to the server and to imitate real users. Dissimilar sets of data are sent to the server every time the script is r


Decision Trees - Artificial intelligence: Suppose you just ever do four things at the weekend: go shopping, watch a film, play tennis or just stay inside.  What you do depends