PLANNING OF APPLICATION OF THE SYSTEM OF DEVICES ON A SET OF OBJECTS FOR THE SCHEME OF ELEMENTARY OPERATION "ONE OBJECT - K DEVICES"

Centralized methods of planning the use of N devices for the realization of operations on a set of M objects with the scheme of the elementary operation is "one object  k devices" are proposed. Methods include modifications for the following cases: 1) only the described scheme of elementary operation is applied ("rigid" requirement); 2) the named scheme is preferred, but there are possible options of reducing the specified (desired) maximum number k for individual operations ("soft" requirement). Methods suitable for multi-elements dynamic systems in real time of their operation. Under planning conditions, the device system and the set of objects are multi-element. Planning methods belong to the category of "fast" methods, which suitable for dynamic multi-element systems in real time of their operation. The verification of the methods is implemented for the generalized system and for the particular case of the satellite system of observation of orbital objects.

Modeling and prediction of the average roughness of UNS S31600 in superfinishing turning

PurposeThe purpose of this paper is to realize an effective hybrid modeling (empirical-geometric) in order to describe the real behavior of the average roughness variation of the workpiece surface in turning with an elementary operation of superfinishing, using different analytic methodologies. The previous works are limited to describe the roughness for the usual elementary operations, citing the roughing and the semi-finishing, while this analysis builds technical rails for the industrialists in order to well conduct the operation of superfinishing in turning, by choosing the cutting parameters from the proposed model.Design/methodology/approachA statistical analysis of the average roughness measurements capability study, by the statistical process control method SPC and the ANN artificial neuron network, Levenberg–Marquardt's methods modified Monte Carlo SRM response surface.FindingsThe objective of this work was to describe the average roughness generated by the penetration of the cutting tool into a part in superfinishing turning. First, the authors used artificial colony analysis to determine optimal cutting conditions in order to have an average roughness lower than 0.8 µm. The cutting conditions selected: (1) the feed rate f ϵ [0.05; 0.2] mm/rev; (2) the pass depth ap ϵ [0.25; 1] mm; (3) the corner radius re = 0.2 mm and (4) cutting speed Vc ϵ [75; 100] m/min.Originality/valueThis work consists to realize an effective hybrid modeling (empirical-geometric) in order to describe the real behavior of the average roughness variation of the workpiece surface in turning with an elementary operation of superfinishing, using different analytic methodologies. The previous works are limited to describe the roughness for the usual elementary operations, citing the roughing and the semi-finishing, while this analysis builds technical rails for the industrialists in order to well conduct the operation of superfinishing in turning, by choosing the cutting parameters from the proposed model.

Analisis Postur Kerja Operator Perakitan di Yessy Shoes untuk Mengidentifikasi Resiko Gangguan Muskuloskeletal Akibat Kerja

<span class="fontstyle0">The application of ergonomics in work place is important because the lack of attention can cause health problems to worker, this can be performed by postural assessment using method of visual management, which assessing each elementary operation of a process to the selected domain ergonomics to produce PES (partial ergonomic score) and with a formula then value of OES (overall ergonomic score) is obtaned that shows the operation status of a process. The results obtained from this study is 5 process have value of OES in the range 0.4&lt;OES≤0.5 so operation status is "investigate; change may be needed” while 17 process have value of OES in the range 0.5&lt;OES≤0.7 so operation status is “investigate; change soon”. The conclusion of this study is the change of work posture of the worker is needed, which can be conducted by designing a facility based on the elementary operation with the highest value of PES.</span>