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
Address translation: Compiler time : If it is known in advance that a program will reside at a particular location of primary memory, and then the compiler can be told to

Method overloading is to overload methods using similar class name by writing different parameters. This is known as Method Overloading.

A v o iding Over fitting - Artificial intelligence As  we  discussed  in  the last  lecture,  over fitting  is  a  normal  problem  in machine learning. Decision trees suffe

Q. Explain about Programmer Visible Registers? Programmer Visible Registers: These registers can be employed by machine or assembly language programmers to minimize reference

#question.Smugglers are becoming very smart day by day. Now they have developed a new technique of sending their messages from one smuggler to another. In their new technology, the

Q. What is interpreter? An interpreter translates each high-level-language statement into its equivalent set of machine-language instructions, which are then executed right awa

What is time slicing? With this technique each program runs for a short period known as a time slice, and then another program runs for its time slice and so on.

Q. Illustrate logical Data Processing Instructions? AND, OR, NOT, XOR operate on binary data stored in registers. For illustration if two registers comprises data:   R1 = 10

Explain about unix file system architecture