vibration, Mechanical Engineering

Assignment Help:
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?

Related Discussions:- vibration

Show continuity equation in cylindrical coordinates, Show continuity equati...

Show continuity equation in cylindrical coordinates. Also list the assumptions made. A fluid flow is given by V = xy 2 i - 2yz 2 j - (zy 2 - 2z 3 /3) k Determine acceleration

Either wheel is wobbling motorcycle problem, If Either Wheel is Wobbling ...

If Either Wheel is Wobbling Causes of Problem Remedy Excessive wheel bearing play Distorted rim Improperly

Compute the maximum bending moment, Compute the maximum bending moment: ...

Compute the maximum bending moment: A simply supported beam of 7 m length carries point loads 2 kN, 4 kN and 6 kN at distances of 1 m, 2 m & 4 m from the fixed end respectivel

Can you explain pneumatic gauges, Q. Can you explain Pneumatic gauges? ...

Q. Can you explain Pneumatic gauges? Pneumatic gauges permit reading or recording water level at some distance from the river, say up to about 305 m. In a diaphragm type gauge,

Yield stress and ultimate stress yield stress, Y ield stress and ultimate ...

Y ield stress and ultimate stress Yield stress: Yield stress can be defined as lowest stress at which extension of test piece increases without increase in the load. It is

Determine the maximum permissible eccentricity of the load, Determine the m...

Determine the maximum permissible eccentricity of the load: A small hollow cylindrical column carries a compressive force of 400 kN. The external diameter of the column is 200

Gears, What is the working depth of a gear

What is the working depth of a gear

Base circle-prime circle-trace point-pressure angle, Base Circle: this is...

Base Circle: this is the smallest circle tangent to the cam profile. Trace Point: this is theoretical point on the follower whose motion explained the movement of the foll

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd