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Modeling of a Hydraulic Braking System
KTH, School of Electrical Engineering (EES), Automatic Control.
2015 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The objective of this thesis is to derive an analytical model representing a reduced

form of a mine hoist hydraulic braking system. Based primarily on fluid

mechanical and mechanical physical modeling, along with a number of simplifying

assumptions, the analytical model will be derived and expressed in the form of a

system of differential equations including a set of static functions. The obtained

model will be suitable for basic simulation and analysis of system dynamics, with

the aim to capture the fundamentals regarding feedback control of the brake

system pressure.

The thesis will mainly cover hydraulic servo valve and brake caliper modeling

including static modeling of brake lining stress-strain and disc spring deflectionforce

characteristics. Nonlinearities such as servo valve hysteresis, saturation,

effects of under- or overlapping spool geometry, flow forces, velocity limitations

and brake caliper frictional forces have intentionally been excluded in order not to

make the model overly complex. The hydraulic braking system will be described

in detail and basic theory that is needed regarding fluid properties and fluid

mechanics will also be covered so as to facilitate the reader in his understanding

of the material presented in this work.

Overall, the scope of this thesis is broad and more work remains in order

to complement the model of the system both qualitatively and quantitatively.

Although not complete in its simplified form and with known nonlinearities aside,

the validity of the model in the lower frequency domain is confirmed by results

given in form of measurements and dynamic simulation. Static analysis of the

brake caliper model is also verified to be essentially correct when comparing

calculated characteristics against actual measurements, as is also the case for the

static models of the brake lining and disc-spring characteristics.

Place, publisher, year, edition, pages
2015. , 100 p.
EES Examensarbete / Master Thesis, IR-EE-SB 2015:000
National Category
Control Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-168924OAI: diva2:818797
Educational program
Master of Science in Engineering - Electrical Engineering
Available from: 2015-06-09 Created: 2015-06-09 Last updated: 2015-06-09Bibliographically approved

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