No abstract

No abstract

This paper proposes the application of biologically -inspired algorithms to determine optimal parameters of metal cutting. The objective functions are operation time, cost per product, and surface roughness. Model of metal cutting is nonlinear, constrained problem. As an example of biologically -inspired algorithm for solving optimization problems, in this paper we have applied the Cuckoo search algorithm, and the Firefly algorithm. Contemporary analysis of these two methods, as well as their hybridization and the experimental results show that the use of biologically -inspired algorithms is applicable to parameter problems optimization of metal cutting.

U radu je razmatran problem optimalne sinteze zglobnog četvorougaonog mehanizma i podesivog krivajno klipnog mehanizma za generisanje zatvorene putanje. Razmatrana su dva slučaja. U prvom slučaju cilj je izvršiti optimizaciju putanje zadatu skupom unapred definisanih tačaka. U drugom slučaju razmatran je višekriterijumski optimizacioni problem tj. izvršena je optimizacija putanje i hoda klizača. U procesu optimalne sinteze primenjen je algoritam sivog vuka. Predloženi algoritam je testiran na odgovarajućim numeričkim primerima iz literature čime je pokazana njegova efikasnost.Ključne reči: optimalna sinteza, krivajno klipni mehanizam, zglobni četvorougao, algoritam sivog vuka Funkcija cilja i ograničenjaFunkcija cilja ima dva dela. Prvi deo funkcije cilja definiše grešku odstupanja sume kvadrata između skupa zadatih i skupa stvarnih tačaka koje u toku kretanja opisuje tačka C spojke. Drugi deo funkcije cilja uzima u obzir ograničenja. Prilikom definisanja optimizacionog problema IMK-14 -Istraživanje i razvoj u teškoj mašinogradnji

This paper presents two ways for the minimization of joint reaction forces due to inertia forces (dynamic joint reaction forces) in a two degrees of freedom (2-DOF) planar serial manipulator. The first way is based on the optimal selection of the angular rotations laws of the manipulator links and the second one is by attaching counterweights to the manipulator links. The influence of the payload carrying by the manipulator on the dynamic joint reaction forces is also considered. The expressions for the joint reaction forces are obtained in a symbolic form by means of the Lagrange equations of motion. The inertial properties of the manipulator links are represented by dynamical equivalent systems of two point masses. The weighted sum of the root mean squares of the magnitudes of the dynamic joint reactions is used as an objective function. The effectiveness of the two ways mentioned is discussed. [Projekat Ministarstva nauke Republike Srbije, br. TR35006 i br. TR35038]