Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: parametry pulsacji

Sortuj według:

Ogranicz wyniki do:

Wpływ zakłóceń w instalacji próżniowej dojarki na parametry pracy wybranych pulsatorów

Wiercioch M., Luberański A., Szlachta J., Skalska D.

Inżynieria Rolnicza

2011

R. 15, nr 8

285-292

Przeprowadzono analizę porównawczą parametrów pracy pulsatorów podczas doju symulowanego w laboratorium w trakcie występowania zakłóceń w instalacji próżniowej dojarki. Do badań użyto 7 pulsatorów różnej konstrukcji, do doju przemiennego i jednoczesnego. Uzyskane wyników wskazały, że wprowadzenie do rurociągu podciśnieniowego zakłócenia w formie porcji powietrza atmosferycznego ze zbiornika o pojemności 20, 15, 10 i 5 dm3, powoduje zmiany w długościach poszczególnych faz cyklu pulsacji a, b, c, d, co w konsekwencji skutkuje zmianą wartości współczynników pulsatorów i częstotliwości pulsacji zwłaszcza hydropulsatorów i pulsatorów pneumatycznych.

Comparative analysis of working parameters of pulsators during simulated milking was carried out in a laboratory during occurance of disturbance in vacuum installation of a milking unit. Seven pulsators of different construction were used for research for alternative and simultaneous milking. Obtained results proved that input of disturbance in the form of air portion to the negative pressure pipeline from a claw which cubic capacity is 20, 15, 10 and 5 dm3 causes chages in the lengths of particular pulsation cycle phases a,b,c,d, what consequently causes fluctuations of pulsators coefficients values and pulsation frequency especially of hydropulsators and pneumatic pulsators.

Characterization of dynamic behaviour of short circuit in pulsed Gas Metal Arc Welding of aluminium

Praveen P., Kang M. J., Yarlagadda K. D. V. P.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 14, nr 1-2

75--82

Purpose: This paper studies dynamic characteristics of short circuit in the pulsed current gas metal arc welding (GMAW-P). Design/methodology/approach: Welding experiments with different values of pulsing parameter and simultaneous recording of high speed camera pictures and welding signals (such as current and voltage) were used to identify different short circuit conditions in GMAW-P. The investigation is based on the synchronization of welding signals and high speed camera to characterize different types of short circuit occurring in GMAW-P system. The behaviour of short circuit under the influence of different pulsing conditions is also investigated. Findings: It will be shown in the paper that short circuit in GMAW-P occurs in different forms which can be categorized depending upon time of short circuit and phase (peak or base time) of the pulse. Further investigation involves study of the dynamic behaviour of short circuit with variation of different pulsing parameters. Research limitations/implications: The results show that by varying the pulse parameters, behaviour of short circuit in GMAW-P is changed. The pulse parameters can be adjusted to avoid occurrence of short circuit in GMAW-P. Future work should concentrate on development of practical indices in terms of pulse welding parameters for quantitative estimation of short circuit occurrence and avoidance. Originality/value: Determination of proper working parameters with GMAW-P is crucial for the appropriate selection of pulse welding parameters. As short-circuiting is common between the welding electrode and the workpiece in GMAW-P, so in order to estimate the working parameters and ensure stable GMAW-P understanding dynamic behaviour of short circuit in GMAW-P will be useful. However, in case of aluminum hardly any attempt is made to analyse the dynamic behaviour of short circuit in GMAW-P. This paper analyses the short circuit phenomenon in GMAW-P and their behaviour with varying pulsing parameters.