Radar system is modelled as a single degree of

freedom with mass 20kg and spring stiffness 75000 N/m. Ignore the effect of damping. The

rotating part of the RADAR imparts a force of 1000sin(ωt) and is designed to rotate at three

different speeds: 5Hz, 10Hz and 15 Hz.

The tender is by open competition, which will be judged not only on the amount of vibration

reduction in the radar system, but also on the minimum increase in mass and the cost of the


The cost of each extra kg is $1 and the cost of each 1000N/m is $1. In order not to interfere with

the supporting structure the minimum resulting natural frequency allowed is 2Hz.

You are asked to submit your tender proposal, including the following:

• Explanation of the theory used

• The design of the absorber where only the reduction in vibration level is considered

• The design of an absorber where vibration level increases in mass and cost are


You won the contract. The first batch of springs delivered to connect the absorber to the radar

system where incorrectly manufactured, such that 1mm free-play was introduced. You have to

analyse the new system and provide the bounds of vibration for the system. You have also been

asked to provide an equivalent linear system and its accuracy.

Hint 1: Common practice to reduce vibration is to add another mass/spring damper system tuned

at the natural frequency of the original system

Hint 2: First order harmonic balance allows for the system to be linearised

Kemahiran: Kejuruteraan Elektrik, Kejuruteraan, Matematik, Matlab and Mathematica, Kejuruteraan Mekanikal

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Tentang Majikan:
( 369 ulasan ) KANPUR, India

ID Projek: #15464365

6 pekerja bebas membida secara purata $4/jam untuk pekerjaan ini


A proposal has not yet been provided

$4 SGD / jam
(39 Ulasan)

Hello,I hope to work for [login to view URL] feel free to contact [login to view URL] Relevant skills matlab,over chat you will see other skills

$4 SGD / jam
(12 Ulasan)
$4 SGD / jam
(0 Ulasan)

A proposal has not yet been provided

$4 SGD / jam
(0 Ulasan)

I am working on modelling and simulations of vehicles. I have strong knowledge in dynamics of the system and also good in electrical. This system can be modelled in MATLAB/Simulink

$3 SGD / jam
(0 Ulasan)
$4 SGD / jam
(0 Ulasan)