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

What is air intakes, Q. What is Air Intakes? Air is drawn from the atmo...

Q. What is Air Intakes? Air is drawn from the atmosphere for a variety of process and equipment uses, including: • Combustion air (fired heaters, boilers, gas turbines, int

Determine fraction of the load would cnt fibers carry, Carbon nanotubes (CN...

Carbon nanotubes (CNTs) with low weight (density = 1.3 g/ cm^3), high tensile strength (50 GPa), and modulus of elasticity (1 TPa) in the axial direction have been touted as the st

Som, a steel bar is 900 mm long

a steel bar is 900 mm long

What is data unification, What is Data Unification To optimize the UPR ...

What is Data Unification To optimize the UPR data structures, during design we study the semantics of each data type of the supported CAD systems and identify data types that a

Steam, what is dry ness fraction?

what is dry ness fraction?

Sizing a solar pv system, The Rusk's own fairly large house near San Franci...

The Rusk's own fairly large house near San Francisco and the following spreadsheet shows their month to month power use for two years.  1. What is their monthly average power us

Design of the microprocessor control system, 1 Prepare a suitable system Me...

1 Prepare a suitable system Memory Map over the first 3K of memory, a suitable PIO configuration and associated Z80 PIO initialisation words in order to support a single electro-hy

Jet pump, full detail of jet pump nozzle design

full detail of jet pump nozzle design

Express the compression force of hydraulic cylinder, Express the compressio...

Express the compression force C in the hydraulic cylinder of the car hoist in terms of the angle Θ, see Fig Q3. The mass of the hoist is negligible compared with the mass of the ve

Lean mixture -mixture requirement , Lean Mixture: It generally ranges...

Lean Mixture: It generally ranges from approximately 15 : 1 to 17 : 1. By the use of this fuel, engine runs for higher economy.

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