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I'll start by saying that I have very little experience with Catia. This question has likely been asked before, but I haven't found a solution online, or from any of my collegues. When dimensioning a hole on a drawing in Pro Engineer, I would add details of the hole e.g. depth, chamfer size...

Sorry, make a mistake - The H7 fit on Dia 72 should be 72 +0.03

Hello. I'm about to machine some aluminium uprights for my car, but I'm struggling to decide on the fit of the wheel bearing. The upright (housing) is Aluminium 7075. The bearing is a double row taper roller assembly. OD 72 ID 39 (is it ford fiesta, using fiesta live front axles) So the outer...

Hi Greg, thanks for your input. My upright design is fixed, so I can only reduce caster trail by sacrificing caster angle. 5 degrees caster gives 28.5mm of trail, do you think this is a better option? Thanks, tom.

Hi Cibachrome. Thanks for your response. There are some details which I deliberately didn't include in my post, because I didn't want them to affect the response of others. I am one (structural) engineer building this car as a hobby and learning exercise. I don't have access to tire data (for...

Forgot to add. Those are initial rates away from ride condition, not average over the whole suspension travel..

Almost a year ago I asked some questions on this board regarding rear suspension geometry and the answers were helpful, thank you. Had some time off the project (real job got in the way) but now I'm finalising the rear and deciding on the front. Anyway, before I go fabricating I just wanted to...

Thanks Greg. I tweaked a little more and the rear RC is now ~60 with front ~38. Whilst I have your attention, can you comment on anti squat? I'd like some, perhaps 15% but this has introduced significant bump steer. Is the game now to move the trackrod out of plane with the lower wishbone...

I misread their graph, camber change per degree of roll isn't as bad as mine, but its still potisive after ~2.5deg body roll.

I'm measuring relative to the ground, I assume they did the same..

Oops, wrong link, try this: Shot at 2012-08-14

Hi Greg, I really don't, but is it actually possible to prevent that on the rear without using a lot of static camber? (this is my first suspension design, still not totally clear what is achievable) I read at some point that ball park camber gain for a performance car is 0.6-0.9 deg/inch...

Hi Everyone. Firstly let me apologise for asking the same questions as many others will have done before me. I'm struggling a bit with lack of experience. I'm designing the suspension for a light weight sports car: 700kg 300 bhp front engine rear drive twin wishbone front twin wishbone rear...

Hi Mike, Thanks for your input. Even with a pure sine wave I don’t get the expected results. The imaginary part after ifft is of the same magnitude as the real part. I followed the FFT example you linked me to and did the following: Fs = 512; % Sampling frequency T = 1/Fs; % Sample time L =...

Yep, and yes - massive spike at mode one in the frequency domain. Peak g is around 350-400. I believe my data is good, just struggling to convert to displacements! What is your suggested method for this IRstuff?

Thanks everyone for your help. By small I mean microns. Its quite a flappy component too, you can see it moving +- 15mm on the shaker rig. First mode is 77 Hz so I should easily have kept the peak displacements. David, good suggestion but I think my units are consistant. I was hoping...

Isn’t that what the FFT’d signal is though, a collection of steady state sine waves? Well, I thought it seemed too good to be true.

Hello,thanks for your response. That is initially what I did, but there was a great deal of drift etc. Saw someone on the internet suggesting this approach. I think the logic is: convert to frequency domain, then: (1) x=Asin(wt) (2) v=wAcos(wt) (3) a=-w^2Asin(wt) Substitute (1) in...

Hello, I'm sure this topic has been covered before, but I'm still struggling with it. The Story: I have signal data from an accelerometer mounted to a car - one lap around a track. After filtering this data (high pass 13Hz) to remove ridgid body motion, I used it to drive a shaker rig with...

Sompting guy - Thankyou! so filter must do the fft - filter - ifft for you.? If I filter my time domain data, then fft, I can see that the first 7Hz have gone. This is what I wanted. Many thanks everyone. New filter file: function Hd = tjfilter Fs = 200; % Sampling frequency T = 1/Fs; %...