Recent content by serbring

thanks for your answers. I will answer to all your comments. The data were checked for their validity (e.g., no logged vehicle position for example, because the GPS did not fix the position) but of course the misclassification may occur and this can never be solved when dealing with a large...

Hi all, I have to analyse a dataset containing real-world vehicle trajectories and in particular: 1. The trajectories were classified into states in the function of certain vehicle parameters and location (urban roads, country roads, etc.) and each state is characterised by an integer number...

Turnng off lead to a zero l/h consumption, but the restarting lead to an addition fuel and electrical energy than just keeping an idling engine. I have found this paper that is rather intestering https://saemobilus.sae.org/content/2004-01-1896

Of course I do! In this link is reported 10seconds, but there is no reference. http://oee.nrcan.gc.ca/transportation/idling/wastes.cfm?attr=8

Hi all, I am aware that idling is fuel inefficient and a waste of fuel, but I guess that it is not always convenient to turn the engine off, since the turning on requires more energy than idling. So, I think that for long periods, turning the engine off is more fuel efficient than idling, but...

Hi all, thanks for your answers. I am not complaining to the quality of their thesis, that is usually pretty high, but the quality of their first draft. I usually make clear since the beginning, I also have a guide, that I wrote few years back, buy it usually takes three drafts, that I have to...

Hi all, I am a professor in mechanical engineering and I have several master thesis students and I am facing the problem with the quality of their thesis. Especially, most of the thesis I have to correct are often very long because they are rich in useless information and lack of literature...

I have also found AIBASE CS, that really seems something in between illustrator and a CAD. It can even import vector images.

Thanks to all for the answers. I have tried some of the suggested free tools and I design is not that much free. There are many constraints. I think the best is to use a specific tool for each kind of scheme (like orcad general purposes, visio for flowcharts and so on) and then import the PDF to...

Hi all, for presentations/lectures and so on, I need to making drawings which make easier the comprehesion of the process I adopt for my research. Occasionaly, I draw flowcharts o something similar, which embed arrows, geometrical figures, plots (sometimes, I simplified a complex plots like...

I have also computed the Pearson's correlation coefficient of the average values of draft with respect 'speed and depth, respectively. The correlation is higher with speed than with depth. Instead, by computing the Pearson's correlation coefficient of the time based draft with respect 'time...

I have used Matlab and the default option is to not normalize the cross correlation. "By default, xcorr computes raw correlations with no normalization" (https://it.mathworks.com/help/signal/ref/xcorr.html#bual1fd-scaleopt). By using the option 'coeff' for "scaleopt" (it means, that normalizes...

but the cross-correlation is the product between the two signals, so since the depth is higher than the speed, the cross-correlations between draft and depth should be higher than that of speed? So depth and speed should be normalized, otherwise the cross-correlation is biased to the variabile...

I made six rund per speed for the A tool and 9 run per speed for the B tool, for each speed. Indeed, you can see 6 red points closer each other.

I will make a plot for your curiosity. However, the frequency is dependent by the clod sizes and therefore correlated with the speed, higher is the speed and higher will be the main frequency. you're also right. This is the 3D plot, but it doesn't look very clear to me...