Processing methods of measured runs of torque and angular speed of combustion engine propulsion system

• Autorzy: Polanowski S.
• Języki publikacji: EN

Abstrakty

EN

In this paper four processing methods of cyclic data runs, namely : Fourier interpolation and transformation, least-squares approximation by means of trigonometric polynomials , synchronous averaging and movable approximation , were presented by using, as an example, discretely measured runs of torque and angular speed. It was demonstrated that for extracting a useful signal out of disturbance background and decomposing the disturbances the appropriate methods are the synchronous averaging and multiple movable approximation. To emerge significant spectral lines from a spectrum the least-squares approximation by using trigonometric polynomials can be applied. The method contains a criterion for signal filtration and is insensitive to disturbances, run truncation and sampling irregularity. Fast Fourier Transform (FFT) may have an auxiliary significance for preliminary spectral analysis. Its main disadvantage is that in order to build a smoothing-out filter its parameters should be determined in advance, e.g. by applying one of the remaining methods.

Słowa kluczowe

EN

ship piston engine; torque; angular velocity; data processing; fast Fourier transform (FFT); least-squares approximation by using trigonometric polynomials (TLSA); movable approximation; synchronous averaging

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2006
• Tom: nr 4
• Strony: 15--22
• Opis fizyczny: Bibliogr. 6 poz., rys., tab.

Twórcy

autor

Polanowski S.

• Mechanic-Electric Faculty, Polish Naval University Śmidowicza 69, 81-103 Gdynia, POLAND,

Bibliografia

• 1. Lynos R. G.: Introduction to the digital processing of signals (in Polish), WKŁ (Communication publishing house), Warszawa, 2003
• 2. Max J.: Mietody i tiechnika obrabotki signałow pri fiziczieskich izmierienijach (translation from French, 1981), v.1, MIR, Moskwa, 1983
• 3. Morawski L., Polanowski S., Szuca Z.: Processing stand-test results of a photo-optic torque meter with the use of movable approximation (in Polish). Proc. of 26th Symp. on Ship Power Plants. Zeszyty Naukowe AMW (Scientific Bulletins of Polish Naval Academy). 2005
• 4. Morawski L., Sikora M.: Application of the photo-optic torque meter to estimation of torque and rotational speed fluctuations of the propeller shaft of ship. 6th Slovak and Czech Conference : SENSOR and SENSOR SYSTEM ‘97. Kosice-Presov. 1997
• 5. Polanowski. S.: The processing of indicator diagrams with the use of the moving approximating objects. Combustion Engines. No 1/2005
• 6. Enslein K., Ralston A., Wilf H. S. (Editors): Statistical Methods for Digital Computers. J. Wiley, 1977