Autor: Pilch, Adam - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Modification of the guitar bracing using optimization
Autorzy:: Pilch, Adam
Tematy:: guitar bracing
optimization
vibration
resonances
ożebrowanie gitary
optymalizacja
drgania
rezonans; Pokaż więcej
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/58908049.pdf Link otwiera się w nowym oknie
Opis:: The form of modern guitars were shaped by Spanish luthiers in the XIX century. Especially Antonio de Torres Jurado is the one, whose designs are an inspiration for modern constructions. From the very beginning, guitars are struggling with not sufficient sound levels for all the desired applications. Apart from electroacoustic amplification, there were several attempts to modify the construction of the sound hole or the soundboard. Higher sound pressure levels were often connected with distorted sound, sometimes not acceptable to musicians. In this paper, inequalities in the frequency characteristics of the sound generated by the guitar with modern sound holes are presented. Resonant frequencies of the soundboard were pointed as being responsible for the too high amplitude of sound in the 600-800 Hz frequency range. Using optimization and finite element method modelling, the best patterns of bracings were proposed to equalize the frequency spectrum and improve the sound of the instrument.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: The acoustics of contiones, or how many Romans could have heard speakers
Autorzy:: Pilch, Adam
Kopij, Kamil
Opis:: Contiones – assemblies during which important Roman politicians discussed the laws proposed at the People’s Assemblies as well as candidates for the offices and presented their opinions to the Roman people – are considered by some scholars as one of the central institutions and rituals of the Roman Republic. Considering the role contiones played in the political life of the Roman Republic, we can ask how many Romans participated in them. In our paper we present results of acoustic analyses of two places at the Forum Romanum that we know were platforms for speakers at contiones: the Rostra and the podium of the Temple of Castores. The main goal of our study was to establish the maximum number of participants that could have heard speeches inteligibly. To do that we used a 3D model of Forum Romanum considering not only the geometry but also the acoustic parameters of materials used to construct the rostra and adjacent constructions. Based on the sound power level of a speaker and possible noise sources, on which the recipients were exposed to, we established areas where speeches could have been heard and understood. This in turn allowed us to estimate the maximum number of recipients.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 3.

Tytuł:: Lightweight floor screed with increased impact sound reduction
Autorzy:: Pilch, Adam
Duda, Piotr
Rubacha, Jarosław
Tematy:: impact sound reduction
lightweight floor screed
redukcja dźwięków uderzeniowych
lekka wylewka podłogowa; Pokaż więcej
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/24201976.pdf Link otwiera się w nowym oknie
Opis:: Increasing users’ requirements force to provide better and better solutions for reducing impact sounds. A lightweight floor screed can be a favorable solution for existing buildings with limited ceiling load capacity, where typical highly effective floating floors are too heavy to be used. In the paper further development of the impact sound reduction measurement method for small lightweight floor screed samples is presented. In order to protect the top layer of the sample from the hammers of the tapping machine, a thin concrete layer was coupled with the sample. What is more, a thin layer of sand below the sample was tested in order to improve the connection between the sample and the concrete floor. Based on obtained results, the concrete top layer and the sand bottom layer reduce slightly the effectiveness of the screed but decrease the uncertainty of the results significantly.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Impact sound reduction measurement method for lightweight floor screed
Autorzy:: Pilch, Adam
Duda, Piotr
Rubacha, Jarosław
Tematy:: lightweight floor screed
tapping machine
vibration
impact sound reduction
lekka wylewka podłogowa
gwinciarka
drgania
redukcja dźwięków uderzeniowych; Pokaż więcej
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/2146646.pdf Link otwiera się w nowym oknie
Opis:: Development and implementation of a new product in the form of a lightweight screed with high impact sound reduction require a lot of measurements of different aggregates of lightweight elements and filling. The manufacturing process influences the final parameters of the solutions as well. This is why a method was developed, that allowed a comparison of many different samples within one measurement session. The measured samples must therefore be small and easy to move. In the paper, various possibilities of impact sound reduction measurements were analyzed being different variants of the normative methods and those existing in the literature on the subject. Based on the obtained results, it was shown that for lightweight floor screeds, sound pressure level measurement is more reliable than vibration acceleration measurements. The top vinyl layer used between the tapping machine and the sample did not influence the results significantly and protected the sample from being distorted by the tapping machine hammers.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: One, Two, Three! Can everybody hear me? : Acoustics of Roman contiones : case studies of the Capitoline Hill and the Temple of Bellona in Rome
Autorzy:: Kopij, Kamil
Pilch, Adam
Popławski, Szymon
Drab, Monika
Opis:: Rhetoric was one of the cornerstones of Roman education and public speaking, the essence of being a Roman politician. The speakers attempted to captivate the audience with their style and convince them of their arguments. Studying the audience is therefore just as important as investigating the speakers and their speeches. The aim of this article is to estimate the number of people who could intelligibly hear a speaker delivering a speech from two speaking platforms located in the city of Rome: the podium of the Temple of Bellona in the Campus Martius (in the Late Republican and Late Augustan periods) and the Capitoline Temple. To do this, we built virtual reconstructions of both venues according to the current state of knowledge about them, taking into account the geometry of the space as well as the materials from which they were built. On the models thus prepared, we carried out acoustic simulations for three different levels of background noise (36, 49, and 55 dBA), resulting in Speech Transmission Index maps. The results became the basis upon which we estimated the size of the maximum potential crowds that could hear speech intelligibly, using two methods based on the behaviour of contemporary crowds. We further compared our results with those of previous studies that concern other speaking platforms in Rome.
Retoryka była jednym z fundamentów rzymskiej edukacji a wystąpienia publiczne esencją bycia rzymskim politykiem. Mówcy starali się oczarować publiczność swoim stylem i przekonać ich do swoich argumentów. Badanie publiczności jest zatem równie ważne, jak badanie mówców i ich przemówień. Celem tego artykułu jest oszacowanie liczby osób, które mogły w zrozumiały sposób usłyszeć mówcę wygłaszającego przemówienie z dwóch mównic znajdujących się w Rzymie: podium Świątyni Bellony na Polu Marsowym (w okresie późnej republiki i późnej Augusta) oraz Świątyni Kapitolińskiej. W tym celu zbudowaliśmy wirtualne rekonstrukcje obu miejsc zgodnie z aktualnym stanem wiedzy na ich temat, biorąc pod uwagę geometrię przestrzeni, a także materiały, z których zostały zbudowane. Na tak przygotowanych modelach przeprowadziliśmy symulacje akustyczne dla trzech różnych poziomów szumu tła (36, 49 i 55 dBA), uzyskując mapy współczynnika transmisji mowy (STI). Wyniki stały się podstawą do oszacowania wielkości maksymalnego potencjalnego tłumu, który mógł słyszeć mowę w sposób zrozumiały, przy użyciu dwóch metod opartych na zachowaniu współczesnego tłumu. Następnie porównaliśmy nasze wyniki z wynikami wcześniejszych badań dotyczących innych mównic w Rzymie.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego