Tytuł : Personalized Anti-Vibration Protection for Telematics Devices in Urban Freight Transport Vehicles

Autor/Autorzy: Jacek Wojnowski, Jarosław Chmiel

Miejsce publikacji: Energies

Rok: 2021

Słowa kluczowe: Additive manufacturing, damping, freight transport, maintenance management, hybrid and electric vehicles, fused deposition modeling, multilevel design and manufacturing process

Abstrakt: Vibrations are a major cause of human health disorders, circuit boards and machinery damage. Vibration dampers are considered to be the best option to counter these issues. Three-dimensional printing techniques play an increasingly important role in manufacturing small polymer parts with tailored properties. Thermoplastic elastomers (TPE) constitute a perfect material for manufacturing small-scale series absorber prototypes due to their thermoplastic nature, good elasticity and damping properties. This paper proposes a novel multi-level approach to the design and manufacturing process, e.g., the first level—selection of material; second level—decision about the geometry of a damper; third—selection of technological printing parameters; fourth—post-printing treatment. This work primarily aims to overview the design and manufacturing process levels. The impact of each step on the damping capacity of small absorbers is assessed. It was found that thermoplastic elastomers and fused deposition modeling (FDM) have huge potential in shaping the physical properties of small, elastomeric absorbers. It was assessed that at every step of the multilevel design and manufacturing process (MDMP), the designer could tailor the damping to meet the desired criteria of a final product: a cylinder-shaped hollow damper that can be made from TPE polymer without post-printing treatment and is characterized by good damping.

Adres strony internetowej (link) do pełnego tekstu publikacji: https://www.mdpi.com/1996-1073/14/14/4193

Tytuł: Issues of Corrosion and Degradation under Dusty Deposits of Energy Biomass

Autor/Autorzy: Jarosław Chmiel, Milena Bojanowska, Maria Sozańska, Bartosz Chmiela, Joanna Grudzień, Justyna Halska

Miejsce publikacji: Energies

Rok: 2021

Słowa kluczowe: Corrosion, degradation of coatings, energy biomass, hydrogen degradation, maintenance management, microbial corrosion

Abstrakt: The aim of the study is to identify and determine the role of microbial degradation taking place in dusty deposits in potential threats (i.e., destruction of protective coatings and development of corrosion) to the means of transport in conditions of transshipment of energy biomass. This paper presents the results of research on the impact of powdery fractions of wood biomass and biomass obtained from oil plants in the degradation of paint coatings and corrosion processes. During the research, exposure to simulated port climate, OM, SEM, and EDS studies were used. It has been found that the presence of the fraction containing protein compounds and amino acids (e.g., dust of rapeseed meal) stimulates the growth of microorganisms whose metabolism products favour the destruction of protective coatings and the development of corrosion. Under the same conditions, the destruction of protective zinc coatings has been observed. It was found that already 14 days of exposure to oily biomass deposits results in damage to paint coatings caused by microbiological processes. The 8-week exposure causes serious degradation of protective coatings and the base material itself. The biomass of wood origin, containing compounds of the tannin type, did not show as much aggressive activity as the biomass with protein compounds.

Adres strony internetowej (link) do pełnego tekstu publikacji: https://www.mdpi.com/1996-1073/14/3/534

Tytuł: Cold Ironing Galvanic Corrosion Issues with Regard to a Shore-to-Ship Medium Voltage Connection

Autor/Autorzy: Maciej Kozak, Jarosław Chmiel

Miejsce publikacji: Energies

Rok: 2020

Słowa kluczowe: capacity, cold ironing, electrochemical corrosion, harbor maintenance management, medium voltage connection

Abstrakt: Cold ironing refers to the usage of less polluting power supply sources to deliver electricity to the moored ship. Such a shore-to-ship system is used when the ship is at a port so the auxiliary combustion engines may be turned off. This paper presents the numerical simulation results of a medium voltage cold-ironing system with regard to the currents flowing between the ship’s hull and grounding busbar. The IT electrical inland system with a neutral grounding resistor, as commonly used in shore-to-ship systems, is investigated. Parasitic capacitances present between the phase-to-hull and phase-to-ground in real-world applications can vary from each other. The direct and alternating currents flowing across the hull, seawater and the pier structure are amongst the causes that can lead to premature reinforced concrete degradation. Chosen cases of phase-to-ground or hull unequal capacitances influencing AC stray currents were considered.

Adres strony internetowej (link) do pełnego tekstu publikacji: https://www.mdpi.com/1996-1073/13/20/5372

Tytuł: Degradation of Watercraft Components Made of Fiberglass-Reinforced Polymer Composites inthe Marine Environment

Autor/Autorzy: Jarosław Chmiel, Patrycja Pawłowska, Wesołowski Mateusz

Miejsce publikacji: Transport Means 2019

Rok: 2019

Słowa kluczowe: composite, degradation, fiberglass, marine environment, polymer

Abstrakt: Polymer structures, reinforced with fiberglass, are increasingly recognized in shipbuilding. They are mainly used for building and repairs of small watercraft. During the operation of yachts at sea, where the environment is harsh, structural elements are particularly exposed to the operation of various degradation factors such as seawater. Consequently, plastic and strength properties of the material deteriorate. This article presents the current methods of fiberglass reinforced polymer composites manufacturing. Research has been performed to determine the degree of degradation of watercraft structural elements made of fiberglass-reinforced polymer composites in hot sea climate conditions.

Adres strony internetowej (link) do pełnego tekstu publikacji: https://transportmeans.ktu.edu/wp-content/uploads/sites/307/2018/02/Transport-means-2019-Part-3.pdf

Tytuł: Effect of atmospheric plasma sprayed TiO2-10% NiAl cermet coating thickness on cavitation erosion, sliding and abrasive wear resistance

Autor/Autorzy: Jarosław Chmiel, Mirosław Szala, Agata Dudek, Andrzej Maruszczyk, Mariusz Walczak, Maciej Kowal

Miejsce publikacji: ACTA PHYSICA POLONICA A

Rok: 2019

Słowa kluczowe: Abrasion, cavitation erosion, Plasma coatings, wear resistance

Abstrakt: Atmospheric plasma spray (APS) wear-resistant coatings are popular in mechanical design for increasing the operation time of machine elements. APS enables the deposition of ceramic, metallic and cermet coatings to ameliorate the effects of wear that cause most of the failures of machine elements. The aim of the work was to investigate the influence of the coating thickness of TiO2-10 wt% NiAl on abrasive, sliding and cavitation erosion resistance. Titania based coatings were deposited by means of APS onto a mild steel substrate using TiO2-10 wt% NiAl feedstock material. The coatings had thicknesses of approx. 50, 100 and 200 μm. The morphology and microstructure of the coatings were examined using a light optical microscope (LOM) and scanning electron microscope (SEM). As-deposited surface topography and the hardness of the coatings were determined. The porosity and thickness were evaluated by using quantities image analysis software. Cavitation erosion tests were performed according to ASTM G32 (vibratory apparatus) and ASTM G134 (cavitating liquid jet). Abrasive and sliding wear tests were conducted using a three body abrasive tester and ball-on-disc apparatus, respectively. Generally the thickest coating presents an increase in resistance to sliding wear and cavitation erosion over the thinnest cermet coating.

Adres strony internetowej (link) do pełnego tekstu publikacji: http://przyrbwn.icm.edu.pl/APP/PDF/136/app136z2p22.pdf

Tytuł monografii: Computational Methods in Enginering Science

Tytuł rozdziału monografii: Digital processing of electrochemical signals generated in conditions of cavitation in liquids

Autor/Autorzy: Jarosław Chmiel, Lech Dorobczyński

Rok: 2019

Słowa kluczowe: Cavitation, electrochemistry, hydrogen adsorption, median filtration, Statistical analysis of signals

Abstrakt: A method of analysis of long time series containing a quasi-periodic signal disturbed by random components is presented. The measurement data contained electrical and pressure signals, recorded at high sampling rates during electrochemical tests in a cavitation cloud on the vibratory rig. Statistical analysis of signals, recorded in digital form allowed to separate of signal variations onto following components:  Component of long period containing constant values, being consequence of applied potential difference, quasi-static variations caused by thermal drift, variations in liquid composition and its conductivity and variations of period are at least 10 time longer, than period of basic wave caused by macroscopic pulsation of cavitation cloud;  Component of frequency corresponding to basic frequency of liquid oscillation;  Component of short period (with duration time below 12 µs), associated with cavitation phenomenon in liquid. Signal processing was carried out with use of adaptive median filter under the terms synchronous sampling with sampling rate not lower than 50 – 100 times more than basic frequency of sampled signal i.e. 1 – 2 MHz.

ISBN: 978-83-7947-386-1

Adres strony internetowej (link) do pełnego tekstu publikacji: http://bc.pollub.pl/dlibra/publication/13625/edition/13298

Tytuł monografii: ICF 2017 - 14th International Conference on Fracture

Tytuł rozdziału monografii: Hydrogen absorption and brittle cracking of metals in conditions of cavitation in liquids

Autor/Autorzy: Jarosław Chmiel

Rok: 2017

Słowa kluczowe: brittle cracking, Cavitation, hydrogen degradation

Abstrakt: The role of hydrogen absorption in cavitation erosion are showed. Filtering of short-term electrochemical signal allowed to extract the signals associated with the phenomena of cavitation cloud. On the vibratory rig combined with Devanathan – Stachursky cell, the accelerated absorption of hydrogen in cavitation condition was observed. Specific forms of erosion in conditions of hydrogen absorption are presented and descibed.

ISBN: 978-1-5108-7848-8

Adres strony internetowej (link) do pełnego tekstu publikacji: http://toc.proceedings.com/47240webtoc.pdf