All Questions
Tagged with automotive-engineering wheels
27
questions
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66
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Alternatives of rubber sealant cement for finalizing patch-plug repair on car tyre?
I am doing a patch-plug repair for a 2mm puncture injury on my car tire:
I have two questions:
1.) The minimum I got at local stores (in India) is a 6mm patch-plug. Do I need to drill/cut the injury ...
- 101
0
votes
2
answers
620
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Tire engineering - are "free rolling" and "slip ratio" defined with respect to a specific tire/road material pair?
Pacjeka states the following on his introduction to tire characteristics:
The upright wheel rolling freely, that is without applying a driving
torque, over a flat level road surface along a straight ...
- 101
2
votes
1
answer
133
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On a car with all-wheel drive, how does the engine provide the angled front wheels with power?
Obviously, a single solid axle connected straight through the wheels would bend if the wheels to which is was connected were to rotate right or left with respect to a vertical line (i.e. be steered). ...
0
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1
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169
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Why is the direction of static friction towards centre in case of circular turning?
Here , a car turning on a circular track. I have marked all the kinds of friction , velocity happening in the diagram.
For the front wheels ,
VT (Tangential velocity) ,Vr(Radial velocity) , VR(...
- 679
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85
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For pure rolling , Proof for every point on wheel has velocity = vc + wr
There are 2 texts I have seen for every point on wheels finding out the exact velocity of certain points.
The theory states for all is that : Every point on wheel has total v = rotational + ...
- 679
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2
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294
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Understanding velocity of points of wheel
I am very grateful to all for helping me out. Thank you. Also , It will be quicker for me to understand if you tell where at which point am I going wrong or right ? This way , I know exactly how much ...
- 679
2
votes
2
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255
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Effects of rolling resistance on wheel angular and vehicle longitudinal speed
The differential equation for wheel speed can be given as:
In here, $T_t$ is driving torque (not braking), $F_x$ is longitudinal force of tyre, $J_w$ is wheel inertia, $\dot{w}$ is angular speed of ...
- 45
2
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1
answer
170
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Suspension for a 135kg velomobile
I'm designing a four-wheel velomobile as a small city bike with good weather protection. The top speed in the city is about 25km/h (7m/s).
The total weight of the velomobile is 35-45kg, and I expect ...
1
vote
1
answer
84
views
Why is longitidunal force of tyre calculated negative in SIMULINK?
With the help of the Vehicle Dynamics Blockset of SIMULINK, it is easy to obtain the tyres' longitudinal force (tractive force) using some of the inputs. You can see one of the examples below.
In ...
- 45
0
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1
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199
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Magic Formula: Calculating of lateral forces
To obtain lateral force according to slip angles, I use Pacejka Magic Formula, but my graph's style is not similar with picture which i added. I cannot find where the mistake is.
...
- 45
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66
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How far have we developed eco-friendly tyres alternatives?
Considering how bad rubber tires is for environment (Microplastic on tyre - NatGeo),
Today tires consist of about 19 percent natural rubber and 24 percent synthetic rubber, which is a plastic polymer....
0
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1
answer
92
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Car trajectory with angled rear wheels (non-Ackerman)
Consider a four-wheel steering vehicle in which:
The front wheels follow Ackerman condition
The rear wheel are rotated with a fixed angle (dir == dor in the picture below, and such angles do not ...
- 3
1
vote
1
answer
279
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Pacejka "Magic Formula" tire models origin of the name
It might be a little off topic but I'm trying to find source for why is that model called magic formula? I read that it's a simple function of commonplace functions, a data fitting. Is it simply an ...
- 13
1
vote
1
answer
119
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Calculate Rolling Resistance Experimentally
I am trying to calculate the exact rolling resistance ($F_{rr}$) of my car. The approach I am going with is a coastdown test at a low speed so no drag slows down the car. From there I am going to ...
- 11
1
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1
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530
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How to regulate torque/RPM on an IWD vehicle
Generally, I'm interested in simple (DIY) electric vehicle design problems. I saw some photos of electric vehicles as in the following pic:
or also you could check this youtube video.
The vehicle is ...
- 173