Determining selected diesel engine combustion descriptors based on the analysis of the coefficient of variation of in-chamber pressure

Bąkowski, Andrzej; Radziszewski, Leszek

doi:10.1515/bpasts-2015-0052

Cited by 15 publications

(10 citation statements)

References 16 publications

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“…To see whether the analysed signal includes the components of other frequencies and low amplitudes, the authors deprived the signal of constant components related to particular crank angles. The resultant signal is represented by the deviations of p c from the mean values, determined according to equation (1). Considering the location of maximum values of p c relative to the crank angle, and the fact that the registered signal is related to the process cycles, this signal can be regarded as close to the periodic signal with period T = 120/n.…”

Section: Experimental Facilities and Same Test Resultsmentioning

confidence: 99%

“…These estimates are easy to calculate, but are useful only when the values of the parameters are Gaussian distributed. The review of the literature [1] shows that the signal of pressure deviations from the mean is also easy to determine and that it can have a significant informational load. This is what the authors of this paper decided to investigate.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of information content of in-cylinder pressure signal deviations from the mean values

2018

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Section: Experimental Facilities and Same Test Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of information content of in-cylinder pressure signal deviations from the mean values

2018

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“…Jest to kluczowa kwestia w przemyśle m.in. motoryzacyjnym [4]. Istnieje, zatem konieczność monitorowania zmian struktury warstwy wierzchniej na całej powierzchni części maszyn [3,6,8].…”

Section: Wstępunclassified

Variability evaluation of surface stereometry in wavelet decomposition using Hotelling T2 test

Makiela

Gogolewski

2015

Mechanik

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StreszczenieDo analizy porównawczej warstwy wierzchniej części maszyn z powodzeniem można stosować testy statystyczne. W artykule zaprezentowano metodę wykorzystującą test T2 Hotellinga do porównywania zarysów stereometrii powierzchni otrzymanych w trakcie procesu dekompozycji i aproksymacji falkowej. Przedstawione wyniki badań i obliczeń dotyczą przykładowych powierzchni uzyskanych po frezowaniu czołowym czterech różnych rodzajów materiałów. Słowa kluczowe: chropowatość powierzchni, test T2 Hotellinga, analiza falkowa VARIABILITY EVALUATION OF SURFACE STEREOMETRY IN WAVELET DECOMPOSITION USING HOTELLING T2 TEST AbstractComparative analysis of the surface layer of machine parts can be successfully carried out using statistical tests. The paper presents a method of comparing the surface stereometry created during wavelet decomposition and approximation using Hotelling's T2 test. The research results and calculations are presented in the examples for four types face milled materials.

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“…Roundness contributes to function and performance of mechanical devices in many ways, including maintaining a lubricating film between mating components. It is particularly important in construction of diesel engines [4].…”

Section: Introductionmentioning

confidence: 99%

Identification and analysis of optimal method parameters of the V-block waviness measurements

Adamczak¹,

Zmarzły²,

Stępień³

2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. At the Kielce University of Technology, a new method of waviness measurement of cylindrical surfaces has been developed. The article deals with the research conducted to find the optimal V-block method parameters that can be used in a measuring device applied to waviness measurement of cylindrical surfaces. In order to keep high measuring accuracy of V-block method, all detectability coefficients which are function of V-block method parameters should not be negative. For this purpose computations were carried out in order to find such angular parameters that can be easily applied in measuring device and allow for obtaining positive detectability coefficients. Results of the study presented in this paper make it possible to modify the design of the measuring device. According to the authors, it will result in increasing the accuracy of V-block waviness measurement of cylindrical parts.Key words: V-block method, waviness measurement, detectability coefficient. Identification and analysis of optimal method parameters of the V-block waviness measurementsS. ADAMCZAK, P. ZMARZŁY* and K. STĘPIEŃFaculty of Mechatronics and Mechanical Engineering, Kielce University of Technology, 7 1000-lecia P. P. Ave., PL-25314 Kielce, Poland ments can also be used to measure cylindricity using different measuring strategy [8,9]. Most of them are suitable for measuring form deviations of small cylindrical elements under laboratory conditions [10]. The growing demands of heavy industry require developing measuring methods that can be performed in-situ, for example, directly on machine tool. For such measurements the V-block method can be used. The first person to conduct research related to the V-block method was a German scientist Georg von Berndt at the beginning of the twentieth century. Boerdijk used harmonic analysis based on trigonometric Fourier series for evaluation of roundness profile measured by the V-block method. An interesting measuring system was developed by Witzke [11]. The measuring device proposed consisted of two V-blocks and an inductive probe. Furthermore, Witzke also carried out computer simulations of the V-block angles. At that time research on the change of the sensor position relative to the axis of the V-block was carried out, which resulted in the introduction of non-symmetric three-point method. In consequence, a number of mathematical models used to complex analysis and to increase V-block method accuracy were developed. Interesting in-situ roundness measuring mechanism based on V-block method was described in [12]. The measuring device is composed of a V-block and an adaptive telescopic support and can be used to measure roundness deviation of crankshaft pin journals directly on grinding machine. Research work related with the application of the V-block method for roundness measurement was also carried out in USA [13].Above mentioned research works have been related with the application of the V-block method to assess roundness measurement only, not to assess waviness, which is more difficult ta...

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Determining selected diesel engine combustion descriptors based on the analysis of the coefficient of variation of in-chamber pressure

Cited by 15 publications

References 16 publications

Analysis of information content of in-cylinder pressure signal deviations from the mean values

Analysis of information content of in-cylinder pressure signal deviations from the mean values

Variability evaluation of surface stereometry in wavelet decomposition using Hotelling T2 test

Identification and analysis of optimal method parameters of the V-block waviness measurements

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