Comparative analysis of different valve timing control methods for single-piston free piston expander-linear generator via an orthogonal experimental design

Li, Jian; Yang, Fubin; Zhang, Honggang; Wu, Zhong; Tian, Yaming; Hou, Xiaochen; Xu, Yonghong; Ren, Jing

doi:10.1016/j.energy.2020.116966

Cited by 33 publications

(15 citation statements)

References 25 publications

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“…Orthogonal array experimental design (OAED) is a highly efficient, economical and easy‐to‐use multi‐factor experimental design method to research a target with multiple factors and levels 28 . OAED is used to select some representative points from the full factorial experiment for conducting experiments on the basis of orthogonality 28 . Thus the results equivalent to a full factorial experiment design can be obtained with the least number of experiments 28 .…”

Section: Resultsmentioning

confidence: 99%

“…OAED is used to select some representative points from the full factorial experiment for conducting experiments on the basis of orthogonality 28 . Thus the results equivalent to a full factorial experiment design can be obtained with the least number of experiments 28 . In this study, OAED was applied for the first time to screen the r‐DSPE step to optimize sorbent combination and sorbent amount.…”

Section: Resultsmentioning

confidence: 99%

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Penicillic acid in fruits: method development, validation by liquid chromatography–tandem mass spectrometry and survey in southern China

Guan

You

et al. 2020

J Sci Food Agric

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BACKGROUND Penicillic acid (PA) is produced by Aspergillus spp. and Penicillium spp., which are common postharvest and storage fungi of fruits. PA can be of concern for human health because of its toxicity and high fruit consumption by the population. However, no data on PA occurrence in various fruits have yet been reported. A quick, easy, cheap, effective, rugged and safe (QuEChERS) approach for PA determination in various fruits was developed and applied to explore PA incidence in fruits. RESULTS The modified QuEChERS procedure with extraction by ethyl acetate and purification by multi‐walled carbon nanotubes (MWCNTs), primary secondary amine (PSA) and octadecyl silane (C18) was established to determine PA in various fruits by high‐performance liquid chromatography–tandem mass spectrometry (HPLC‐MS/MS). The average recoveries were 72.9–102.2% and relative standard deviations (RSDs) were 1.3–7.9%. A total of 161 fruits samples, including kiwi, apple, peach, grape and mandarin/orange, were collected in southern China. The incidence of PA in fruits was 14.9% and the levels of PA contamination were 0.200–0.596 μg kg−1. Our results suggested that orange/mandarin, grape and kiwi were favorable matrices for Aspergillus spp. and Penicillium spp. to produce PA, rather than peach and apple. CONCLUSION To the best of our knowledge, this is the first report about PA contamination in various fruits in China. Our study emphasizes the necessity of the current established method, which could be used for continuous monitoring of PA and reducing the health risk to Chinese consumers. © 2020 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Penicillic acid in fruits: method development, validation by liquid chromatography–tandem mass spectrometry and survey in southern China

Guan

You

et al. 2020

J Sci Food Agric

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“…In the variance analysis, the F-test was used to determine the effect degree of each factor on the axial limiting cutting depth a plim _ feed , and the parameters needed to perform the F-test were calculated according to Equation ( 16) [30].…”

Section: Chatter Stability Analysis Considering Uncertain Position An...mentioning

confidence: 99%

“…The significance level of each factor is determined by comparing the obtained F value with the standard F value (F α (df j , df e )). When the significant level α is given, the standard value F α (df j , df e ) can be attained from the F-table in accordance with the degree of freedom [30]. If the F value is higher than the standard F α value, the factor is regarded as significant.…”

Section: Chatter Stability Analysis Considering Uncertain Position An...mentioning

confidence: 99%

Prediction of Tool Point Frequency Response Functions within Machine Tool Work Volume Considering the Position and Feed Direction Dependence

et al. 2020

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A chatter vibration in milling process results in poor surface finish and machining efficiency. To avoid the chatter vibration, the stability lobe diagram (SLD) which is the function of tool point frequency response functions (FRFs) is adopted to predict the chatter-free machining parameters. However, the tool point FRF varies with the changes of machining positions and feed directions within machine tool work volume. Considering this situation, this paper presents a method to predict the position and feed direction-dependent tool point FRF. First, modal parameters of the tool point FRFs obtained at some typical positions and feed directions are identified by the modal theory and matrix transformation method. With the sample information, a back propagation (BP) neural network whose inputs are the position coordinates and feed angle and outputs are the modal parameters can be trained with the aid of the particle swarm optimization (PSO) algorithm. Then, modal parameters corresponding to any position and feed direction can be predicted by the trained BP neural network and used to reorganize the tool point FRFs with the modal fitting technique. A case study was performed on a real vertical machining center to demonstrate the accurate prediction of position and feed direction-dependent tool point FRFs. Furthermore, the position and feed direction-dependent milling stability was researched and origin-symmetric distributions of the limiting axial cutting depths at each machining position were observed.

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“…It is worth noting here that research and development works on novel variable expansion ratio volumetric expanders are ongoing. The examples are scroll machines with injection ports [22][23][24], piston devices with controlled valves [25], and screw machines with sliding ports [26][27][28]. In contrast to turbo expanders, volumetric machines are able to operate under poor operating conditions (i.e., low working fluid flow rates and low pressures).…”

Section: Introductionmentioning

confidence: 99%

The Method of the Working Fluid Selection for Organic Rankine Cycle (ORC) Systems Employing Volumetric Expanders

Kolasiński

2020

Energies

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The working fluid selection is one of the most important issues faced when designing Organic Rankine Cycle (ORC) systems. The choice of working fluid is dictated by different criteria. The most important of them are safety of use, impact on the environment, and physical and chemical parameters. The type of ORC system in which the working fluid is to be used and the type of expander applied in this system is also affecting the working fluid selection. Nowadays, volumetric expanders are increasingly used in ORC systems. In the case of volumetric expanders, in addition to the aforementioned working fluid selection criteria, additional parameters are considered during the selecting of the working fluid, such as the range of operating pressures and geometric dimensions (determining the volume of working chambers) affecting the achieved power and efficiency of the expander. This article presents a method of selecting a working medium for ORC systems using volumetric expanders. This method is based on the dimensionless rating parameters applied for the comparative analysis of different working fluids. Dimensionless parameters were defined for selected thermal properties of the working fluids, namely thermal capacity, mean temperature of evaporation, mean temperature of condensation, pressure and volumetric expansion ratio, volumetric expandability, as well as the heat of preheating, vaporization, superheating, cooling, and liquefaction. Moreover, isentropic expansion work was considered as the rating parameter. In this article, in addition to the working fluid selection method, computational examples related to the selection of the working fluid for the ORC system fed by a heat source featuring specified temperatures are presented. The results of calculations of rating parameters and their comparison gave an outlook on the selection of appropriate working fluids.

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Comparative analysis of different valve timing control methods for single-piston free piston expander-linear generator via an orthogonal experimental design

Cited by 33 publications

References 25 publications

Penicillic acid in fruits: method development, validation by liquid chromatography–tandem mass spectrometry and survey in southern China

Penicillic acid in fruits: method development, validation by liquid chromatography–tandem mass spectrometry and survey in southern China

Prediction of Tool Point Frequency Response Functions within Machine Tool Work Volume Considering the Position and Feed Direction Dependence

The Method of the Working Fluid Selection for Organic Rankine Cycle (ORC) Systems Employing Volumetric Expanders

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