User Account

All Pages

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

Explain principle of design of jig and fixture, Explain Principle of Design...

Explain Principle of Design of Jig and Fixture While designing jigs and fixtures following considerations should kept in mind: Reduction of idle time. Rigidity

Compression ratio-bottom dead centre, Compression Ratio (r): It is th...

Compression Ratio (r): It is the ratio of the total cylinder volume when the piston is at the bottom dead centre, V t to the clearance volume, V C . R= v t /v c

Find out the deflection - vertical, Find out the deflection: Find out ...

Find out the deflection: Find out the deflection (vertical) at a distance 'a' from the tip in Example Solution As in this case there is no load at the point where the

GOVERNOR, APPLICATION OF GOVERNOR

APPLICATION OF GOVERNOR

Form tool design, I want to make a form tool for lathe for making a convex ...

I want to make a form tool for lathe for making a convex groove of 3 mm radius. tool material will be tungsten carbide. I want to know the dimensions of tool. What is the procedure

Find out longest span which beam would carry m uniform load, Q.  A supporte...

Q.  A supported rectangular beam with the symmetrical section 200mm in depth is having moment of inertia of 2.26 x 10 -5 m 4 about  its neutral axis. Find out longest span over w

Rubber, Rubber Rubber is a plastic that is largely derived from natura...

Rubber Rubber is a plastic that is largely derived from natural sources and utilized in a modified form. For automobile tyres, Rubber is well identified as material. Rubber re

Determine the largest value of force, Do not round intermediate calculation...

Do not round intermediate calculations; however for display purposes report intermediate steps rounded to four significant figures. Give your final answer(s) to three significant f

Coagulation-flocculation-sedimentation, 2. Assume that the river has been s...

2. Assume that the river has been selected as the source of raw water for the 2.0mgd demand. a. Surface water has low alkalinity, high turbidity. The distribution system is cast

Instantaneous stress formula, Ask quesinstantaneous stress formulation #Min...

Ask quesinstantaneous stress formulation #Minimum 100 words accepted#

Write Your Message!

Captcha
Order Assignment

Featured Services

Order Now

Popular Subjects

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!

Submit Assignment

Academics

Major Subjects

Majors

Get In Touch

whatsapp: +91-977-207-8620

Phone: +91-977-207-8620

Email: [email protected]

TERMS & POLICIES

HELP & SUPPORT

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