Pri vstavljanju podatkov v polja moramo upostevati koordinatni sistem, ki je podan na vsaki sliki ob podatkovnih poljih.
Maksimalno stevilo sil, ki jih lahko vnesemo je 5, lahko jih pa vnesemo manj.
Sile vnasamo zaporedno, v primeru vnosa dveh sil (F) vtipkamo njuni vrednosti z ustreznim predznakom v prvi dve polji, v ostalih pustimo vrednost nic.
Poleg sil moramo vpisati se oddaljenost od obesisca A (L) in sicer na enak nacin kot smo vpisali sile. Obvezen podatek je se razdalja med obesiscima, ki jo vpisemo v sesto polje (L6).
Glede na znani pogoj izberemo opcije a, b ali c in nato potrdimo z aktiviranjem gumba OK.
- V kolikor imamo znano dolzino vrvi (pogoj a), moramo njeno vrednost vtipkati v polje poleg slike. Dolzina mora biti pozitivna in daljsa od razdalje med podporama (L6). Z aktiviranjem gumba OK se bo pricelo racunanje reakcij in sil v podporah in vrvi. Pri tem pogoju bo program za izracun lahko potreboval malo vec casa, kar je predvsem odvisno od podatkov, saj je racunanje iterativno.
- V primeru, da imamo znano horizontalno silo (pogoj b), vpisemo njeno vrednost v prazno polje poleg ustrezne slike in aktiviramo gumb OK.
- Ko poznamo pozicijo prijemalisca ene od sil, izberemo pogoj c. Vpisemo vertikalno pozicijo (z) od ene sile in sicer v tisto polje, ki ustreza sili, ostale pustimo enake 0. Vertikalna komponenta prijemalisca poznane sile mora biti razlicno od nic in od razlike visine med obesiscima (Zab). Rezultate dobimo s pritiskom tipke OK.
V kolikor ste vse potrebne podatke pravilno vpisali, vam bo program izracunal reakcije v podporah in sile v posameznih poljih vrvi. V vecini primerov, ko boste kaj narobe vpisali vam bo program samodejno javil napako pri vnosu in ko jo boste odpravili, bo izvedel racunanje.
We have to consider coordinate system, when we insert values for forces (F) and lenghts (L).
Maxsimum number of forces that we can insert is 5. We insert forces successively. In case we would like to insert two forces (F), we write their values in first two writing fields, but we leave unchanged values in all the rest, so they are equal to zero.
We also have to insert distance (L) from support A to the force. This is done the same way as was done for forces. Necessary information is lenght between supports A and B, which you insert in writing field marked with L6.
We choose condition a, b or c and then confirm it by pressing OK button .
- If we know lenght of a rope (condition a), we insert it's value in a writting field beside picture. Lenght must be positive and longer than distance between supports (L6). We will get values of reactions and forces in rope by pressing OK button. Program will sometimes need some time to do calculations, this depends on inserted values, because of iterativ calculation.
- In case that we know horizontal force (condition b), we insert it's value in empty writing field and activate button OK.
- In case that we know position of one force, we choose condition c. We insert vertical position (z) of one force. If we know position of the first force we write it's value in first writing box (z1), for second force in second writing box (z2) and so on. Value for vertical position must be different than zero or the height between supports (Zab). We get results by pressing OK button.
In case that all values were inserted correctly, then program will calculate reactions in supports and forces in rope. In most cases when values will be inserted incorrectly, program will alert an error.
