how to give speed in quarter car model/

in quarter car model how to give the speed to vehicle of quarter car model in simulink? I have attached figure of my quarter car model.

Answer 1

[Sam Chak]

Hi @Vikas

I'm no expert but I think the speed of the car is somewhat related to the Road Surface Profile. If the car stops travelling, then the road surface stop affecting the suspension system.

If the circled block describes the Road Surface Profile, then the speed should be injected from here.

[Vikas]

Thankyou sir I got it from your explanation. its really helpful for me. if we want to make a sinwave at vehicle speed of 20KMPH how to make it then. In simulink i have attached sin wave photo

[Sam Chak]

Hi @Vikas

The unit (rad/s) in the Freqeuncy field is technically called Angular Frequency, denoted by ω, which is given by this formula:

Note that λ is the wavelength measured in km.

Vkmh   = 20;    % km/h
lambda = 0.01;  % km in 1 cycle
omega  = (Vkmh/lambda)*(pi/1800)

omega = 3.4907

Then insert rad/s in the Frequency (rad/sec) field.

[Vikas]

thank you for the help its really helpful for me

[Sam Chak]

You are welcome, @Vikas. I'm glad that it is helpful. If you are happy with the proposed solution, please consider accepting ✔ and voting 👍 the Answer. Thanks a bunch! 🙏