The calculation file is attached in the description box. Download it and start tabulating your data. DOWNLOAD the file and then you can edit as per your convenience. Don't make chnages in the original file.
Geometry explains the locus of all moving points. If the vehicle takes a turn, the components move and we need to find their path of movement. The purpose of geometry is to find that path and also to find the dimensions of any required parameter.
@@murtaz1406 and how do you draw that geometry? Some software? Free hand or what? Cuz I am unable to understand how to find the rack travel, and it just confuses me more and more, the deeper I look into it
In my knowledge, there are no formulas for them. You need to calculate it by making the geometry itself. Lock to lock angle needs to be assumed as per the steering effort. If you are having a very large steering effort then increase the lock to lock angle.
I had a doubt as to the steps taken for the assumptions taken, like the wheel base, track width, outside angle etc. I mean, if the judges or someone asks how we reached those assumptions, I'm guessing we should know the reasons for it. And i just am unable to find online, how to reach that conclusion. Please kindly help me if possible
You will have certain inputs from other subsystem teams(majorly suspension and transmission), like the wheelbase and the trackwidth are decided to keep in mind all the components of the vehicle. Outside angle is assumed for the first geometry and then different values are iterated. To start the geometry you have to make certain assumptions, otherwise you won't be able to proceed with the design. That's the whole point of making a geometry - assume and iterate until you have the best one matching with the suspension geometry parameters (like pivoted distance).
@@murtaz1406 as you said, certain assumptions have to be taken to be able to complete the calcs. But do those assumptions include stuff like kpi, tie rod length etc too? Cuz if not, then how does one find out those lengths?
@@vabsyo4891 assume the kpi length... This length will be according to the requirements of the suspension system. You'll be getting the tie rod top view projection length from geometry. You need to assume the rack casing length and its placement from the wheel axis. You have to fix certain parameters and iterate to find the next parameters. Once you are certain of some values you can perform iterations to find out others. Watch the video once again maybe you'll understand what I mean to say.
@@murtaz1406 i understand some parts of what you said. Some I don't. Do you have any other platforms where I can contact you? Instagram or maybe telegram? Not everything can be discussed thru YT comments section lol
@@fragkiskosrosolymos9319 I've taken c factor as mm per inch revolution (or say per inch rack travel) and you're taking it as mm per degrees of revolution.
Also, I had a doubt regarding the dimensions of the buggy. Like the max limit for buggy is 64*108 in. Why go for 51*54, is there a particular method to calculate it? Is it supposed to be this much? Cuz even in the online resources, they have taken the dimensions somewhere along the same lines as your video
The calculation file is attached in the description box.
Download it and start tabulating your data.
DOWNLOAD the file and then you can edit as per your convenience. Don't make chnages in the original file.
docs.google.com/spreadsheets/d/1ILBBtCGRStox9-p77mYhae70akbHqoye/edit?usp=drivesdk&ouid=108576924471288463475&rtpof=true&sd=true
What is this “geometry” that you have mentioned frequently, from which we are getting some of the values?
Geometry explains the locus of all moving points. If the vehicle takes a turn, the components move and we need to find their path of movement. The purpose of geometry is to find that path and also to find the dimensions of any required parameter.
@@murtaz1406 and how do you draw that geometry? Some software? Free hand or what? Cuz I am unable to understand how to find the rack travel, and it just confuses me more and more, the deeper I look into it
In Ackerman value calculation in the denominator it should be tan(outter angle)?
No... The formula is correct.
how to calculate rack travel, lock to lock angle and steering ratio?? I am unable to find formulas for it.
In my knowledge, there are no formulas for them. You need to calculate it by making the geometry itself. Lock to lock angle needs to be assumed as per the steering effort. If you are having a very large steering effort then increase the lock to lock angle.
What is the steering angle ?
I had a doubt as to the steps taken for the assumptions taken, like the wheel base, track width, outside angle etc. I mean, if the judges or someone asks how we reached those assumptions, I'm guessing we should know the reasons for it. And i just am unable to find online, how to reach that conclusion. Please kindly help me if possible
You will have certain inputs from other subsystem teams(majorly suspension and transmission), like the wheelbase and the trackwidth are decided to keep in mind all the components of the vehicle. Outside angle is assumed for the first geometry and then different values are iterated.
To start the geometry you have to make certain assumptions, otherwise you won't be able to proceed with the design.
That's the whole point of making a geometry - assume and iterate until you have the best one matching with the suspension geometry parameters (like pivoted distance).
@@murtaz1406 as you said, certain assumptions have to be taken to be able to complete the calcs. But do those assumptions include stuff like kpi, tie rod length etc too? Cuz if not, then how does one find out those lengths?
@@vabsyo4891 assume the kpi length... This length will be according to the requirements of the suspension system. You'll be getting the tie rod top view projection length from geometry. You need to assume the rack casing length and its placement from the wheel axis.
You have to fix certain parameters and iterate to find the next parameters. Once you are certain of some values you can perform iterations to find out others. Watch the video once again maybe you'll understand what I mean to say.
@@murtaz1406 i understand some parts of what you said. Some I don't. Do you have any other platforms where I can contact you? Instagram or maybe telegram? Not everything can be discussed thru YT comments section lol
@@vabsyo4891 instagram.com/murtaz_14.06?igshid=MzNlNGNkZWQ4Mg==
Are you sure the formula for the c factor is correct?
Yes...
But do you have some other formula?
Yes. C factor=rack travel/360% of the pinion
@@fragkiskosrosolymos9319 aren't these both formulas same?
@@murtaz1406 I really don t know. It s the first time I am studying about gears and dynamics so I am confused
@@fragkiskosrosolymos9319 I've taken c factor as mm per inch revolution (or say per inch rack travel) and you're taking it as mm per degrees of revolution.
Also, I had a doubt regarding the dimensions of the buggy. Like the max limit for buggy is 64*108 in. Why go for 51*54, is there a particular method to calculate it? Is it supposed to be this much? Cuz even in the online resources, they have taken the dimensions somewhere along the same lines as your video