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Vehicle Dynamics > What is Vehicle Dynamics, Tires > Flashcards

What is Vehicle Dynamics, Tires Flashcards

1
Q

What is Vehicle Dynamics?

A

How a vehicle behaves during motion
-> How does a vehicle respond to a certain driver input
-> Analysis whether that response is safe and comfortable

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2
Q

What are the two approaches to Vehicle Dynamics, Explain them

A

Empirical -> trial an error

Analytical –> use of mathematical models that follow the laws of physics to predict the response of a car

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3
Q

Draw a flowchart concerning vehicle dynamics

A
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4
Q

what are the 3 areas of vehicle dynamics?

A

Longitudinal Dynamics -> how does the vehicle respond under acceleration, breaking and how stable is the car in a straight line

Lateral Dynamics –> How does the vehicle respond while turning

Vertical Dynamics –> How does the car respond vertically

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5
Q

What materials exist in tires?

A

Antioxidants, Antiozoneants, Curing Systems

Filler (Carbon & Black Silica)

Natural Rubber

Textiles

Synthetic Polymers

Steel

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6
Q

What do Antioxidants, Antiozoneants, Curing Systems do for the tire?

A

Antioxidants –> Prevents thermal degradation of the natural rubber from oxygen
Antiozoneants –> Prevents thermal degradation of the natural rubber from oxygen
Curing Systmes –> Helps to vulcanise the rubber (Harden it)

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7
Q

What do Fillers do for the tire

A

Fillers improve wear resistance and traction
Silica decreases the rolling resistance

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8
Q

What do textiles do for the tire

A

Reinforce the tire
provides dimentional stability

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9
Q

What is dimensional stability

A

a materials ability to maintain its original dimensions and shape

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10
Q

how is steel implemented into the tire, what does it do for the tire

A

steel embedded in tire belts
-> provides more stability and stiffness to the tread
-> improves wear performance and road handling

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11
Q

What does natural rubber do for the tire

A

visoelastic material

Tear and fatigue (crack) resistance
Deformation and mechanical resistance
Impermeable substance

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12
Q

What do synthetic polymers do for the tire

A

Decreases rolling resistance and wear

Increases Traction

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13
Q

What’s the Notion for an Elastic Material, Friction and a Damper/dashpot

A
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14
Q

What is the notation for a metal

A
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15
Q

what is the notation for a kelvin model of a visoelastimer

A
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16
Q

what is the notation for the maxwell model of a visoelastomer

A
17
Q

Explain the Maxwell Model

A

A Model that predicts the deformation of a visoelastomer
Assumes simultaneous elastic deformation and dashpot activation
Focus’ on creep behaviour, doesn’t take relaxation into account

18
Q

Explain the Kelvin Model

A

A Model that predicts the deformation of a visoelastomer
Assumes time dependant elastic deformation and dashpot activation
Uses Maxwell and Voigt models (Creep and relaxation)
More realistic for predicting visoelastomer deformation

19
Q

What is creep

A

gradual and permanent deformation over time

20
Q

what is relaxation

A

observed decrease in stress when a material is stretched to a constant strain

21
Q

Draw and explain a stress-strain graph for elastic deformation

A

Loading and unloading lines remain identical untill the yield strength is supassed

22
Q

Draw and explain a stress-strain graph for visoelastic deformation.
Explain the Hysterisis Loss

A

Different loading and unloading lines
The gap between the loading and unloading lines is called the Hysterisis Loss

23
Q

Explain the Hysterisis Loss

A

Constant loading and unloading of tire treads cause small permanent deformation over time
Loss in performance
Loss is compensated by the vehicles engine, - less fuel efficient

24
Q

Draw and explain the distribution of stresses of a stationary tire

A

Symmetric distribution of forces on the contact patch
Contact pressure = inflation pressure

25
Q

what is contact pressure and inflation pressure

A

Contact pressure -> reaction force between the car and the ground
inflation pressure –> pressure caused by the air in the tire

26
Q

Draw and explain the distribution of stresses on a tire rotating anticlockwise

A

Distribution shifts to the left
At the same strain, the loading curve has a higher stress then the unloading
The LHS tire is loading , RHS is unloading
More stress on the LHS

27
Q

Draw a picture to aid with your explanation of rolling resistance

A

At the centre of the tire a pair of equal an opposite forces , cause a couple and a moment against the motion of the tire.
This moment produces a force against the motion of the car called Rolling resistance
-> produced due to a property of elastic or visoelastic materials

28
Q

what is the equation of Rolling Resistance

A

Vehicle Dynamics (4 decks)

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