How to calculate 1.5 order wheel torque fluctuation value ?

[Chethanks]

I have the raw data in .csv file which has Engine speed, wheel torque value and main shaft speed (Please refer to below image - raw data_screen shot)

Raw data Screen shot.JPG

I have to find the logic for the above raw data, to get 1.5 order wheel torque value, which is close to resulted value as attached (Result_1.5 order torque value as shown below).

Result_1.5 order torque value.JPG


I am working on this, I request all members of research gate forum to help me on this to create a logic/formula.

If the above information is not clear enough, please ask me

Many thanks,
CKS

[anonymous-user]

I think if you google "FFT" you will be able to get your homework done......... ;-)

[Krikkit]

Had a frosty reception on physicsforums too, they just binned it.

[Chethanks]

I read about FFT, but dont know how I cam Implement it as per my requirement. Can you give me any suggestions ?

[Monkeylegend]

The above information is not clear enough. I request the OP to provide clearer data.

[sebhaque]

Maybe you'd get better results on "research gate forum"? This is PistonHeads.

Not to mention, if you wanted people to help you should probably provide all of the information rather than just posting a picture of a tiny portion of a spreadsheet.

[Chethanks]

Sorry, I don't know the meaning of OP.

The two screen shots I have attached,

First Image: Raw data (3 cylinder mode, wheel torque fluctuation data)
Second Image: The above raw data has been processed, and provides 1.5 order wheel torque value

In order to process the raw data, Some calculations are required, to get the result close/equal to 1.5 order value ( as attached in results_1.5_order image).

Basically, using raw data (wheel torque, engine speed, main shaft speed) I have to get the 1.5 order value of wheel torque value.



Many thanks,
CKS

[Monkeylegend]

Chethanks said:

Sorry, I don't know the meaning of OP.

It means Orifice position.

[Chethanks]

I am ready to upload two CSV files: 1. raw data file and the second file- 1.5 order wheel torque data both has around 12000 rows and 4 columns.

I am not able to upload these CSV files. Is there any way that I can send the files.

Sorry guys, I want to clear you all. I am not in connect with any forums by name research gate. I am hearing this first time.


Trust me,
CKS

[B'stard Child]

Chethanks said:

Sorry guys, I want to clear you all. I am not in connect with any forums by name research gate. I am hearing this first time.

In the first post you wrote

Chethanks said:

I am working on this, I request all members of research gate forum to help me on this to create a logic/formula.

Chethanks said:

Trust me,
CKS

Not a chance..........

[carl_w]

I think what you need is a copy of Press et al's "Numerical Recipes". I have the FORTRAN version, but my understanding is the C version is rubbish as it's C written by FORTRAN programmers.

[Monkeylegend]

I really wish I knew what everyone is talking about, apart from me, and I am talking rubbish.

[B'stard Child]

Monkeylegend said:

I really wish I knew what everyone is talking about, apart from me, and I am talking rubbish.

Someones stuck with their homework...... (it's half term right?)

[knitware]

Chethanks said:

Sorry, I don't know the meaning of OP.

The two screen shots I have attached,

First Image: Raw data (3 cylinder mode, wheel torque fluctuation data)
Second Image: The above raw data has been processed, and provides 1.5 order wheel torque value

In order to process the raw data, Some calculations are required, to get the result close/equal to 1.5 order value ( as attached in results_1.5_order image).

Basically, using raw data (wheel torque, engine speed, main shaft speed) I have to get the 1.5 order value of wheel torque value.



Many thanks,
CKS

Are you from the future? If so these things you speak of haven't been invented yet.

[Toltec]

Max_Torque said:

I think if you google "FFT" you will be able to get your homework done......... ;-)

Is he asking about the fluctuation in torque applied to the wheels.

[AER]

FFT can give you amplitude in the frequency domain from amplitude in the time domain. There's an FFT function in MS Excel. You can read up on it there. You need your data series to be a length of 2^x where x defines the highest frequency you want to see in a Nyquist-kind-of-way. At least that's the way I think it works. There's a bunch of scaling to be done to make sense of the data, but if you're not up to figuring that out yourself, perhaps you should step away from the mathematics...