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Tytuł:
Vibration isolators test bench
Autorzy:
Pobedin, A.
Kosov, O.
Shekhovtsov, K.
Powiązania:
https://bibliotekanauki.pl/articles/244493.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vibration isolator
test bench
vehicle cabin
suspension
testing
elastic and damping characteristic
Opis:
The description of the scheme and design of the test bench for testing vibration isolators intended for use in the vehicle's cabin suspension. Test bench construction allows to implement a wide range of loadings on vibration isolator of the vehicle cabin, to investigate the impact of the loading's arm changing and to perform analysis of the vibration isolator’s elastic and damping characteristics changing impact on cushioning quality. Variant of the test bench construction modernization, which can allow applying typical exploitation loads, which include vertical and lateral components, is described. We propose a scheme of forced oscillations excitation system on the test bench by cam-eccentric mechanism. It includes a DC motor with stepless frequency regulation and with cams of different shape on its shaft, which affect the contact surface of the test bench's vertical H-beam of a rocker arm. We also propose a scheme of forced oscillations excitation system on the test bench by inertial exciter. It includes a DC motor with stepless frequency regulation with inertial vibration exciter on its shaft, which consists of a mass, placed eccentrically relative to the shaft axis. There are two variants of the test bench scheme – with the forced oscillations excitation device and without it.
Źródło:
Journal of KONES; 2011, 18, 1; 457-462
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of a test bench for testing torsional stiffness
Autorzy:
Macikowski, Krzysztof Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/1179524.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
active stabilizer
modification
rectangular cross-section
test bench
torque issues
torsional stiffness
Opis:
Described modification concern a test bench for testing torsional stiffness. The bench was created to analyze behaviour a middle part of a new type of an active stabilizer. The middle part was was replaced by two or four profiles with rectangular cross-section which are constantly connected with not-changed parts of stabilizer (with its arms). Specially designed mechanism is responsible for changing stiffness and it performs it so that the profiles are expanded in the middle of sample on the same distance in opposite direction. An article contains brief description of mentioned test bench and one of a few issues which were revealed during investigations – weak accurancy of obtained results. It was determinated that modification in the area of the bench drive and change in recording system should allow on increase accuracy. After modifications became able to observe a phenomenon of changing torque behaviour, from linear to nonlinear, during twisting expanded sample.
Źródło:
World Scientific News; 2017, 76; 42-49
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Load capacity of the mixed bench and slab foundation. Numerical simulations and analytical calculation model
Autorzy:
Grodecki, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1845166.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bench foundation
slab foundation
load capacity
numerical modelling
Opis:
The paper presents results of a numerical investigation on load capacity of the mixed bench and slab shallow foundations (often used in the process of the modernization of the old, antique buildings, which are suffering from lack of the load capacity). The main trouble with use of existing analytical approaches is a non-unique foundation level of the bench and slab, they could even be founded on different geotechnical layers. Proposed analytical model based on Brinch Hansen (EC-7) approach could deal with such a problem. Results of 2D and 3D numerical modelling (ultimate load of the foundation) are compared to the obtained by using the proposed approach. Influence of the soil above the foundation level is also investigated. Different width to length ratios of the foundation are analyzed (from "short" to "long" foundations). Usability of the proposed analytical model in engineering practice is proved by numerical simulations; the obtained results are on the safe side with quite acceptable margin of additional safety.
Źródło:
Studia Geotechnica et Mechanica; 2021, 43, 2; 135-141
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Small gas turbine GTM-120 bench testing with emission measurements
Autorzy:
Chmielewski, M.
Gieras, M.
Powiązania:
https://bibliotekanauki.pl/articles/245082.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
small gas turbine
emission measurements
combustion engines
bench testing
engine performance
Opis:
The aim of this paper is to provide comprehensive bench testing results for small gas turbine engine with a strong focus on the flue gas emission measurements. After a short overview of small gas turbine GTM-120 design and working principles, the test bench developed at the Institute of Heat Engineering at the Warsaw University of Technology is presented. Capability and accuracy of the sensors used in test bench are discussed in detail. Data acquisition software based on LabVIEW is also presented. Five separate sections representing successive engine stations have been distinguished. Experimental set of data of pressure and temperature on all of the stations is presented for the whole range of engine rotational speeds. Additionally, the engine thrust and fuel consumption data is provided. Special attention is given to the engine NOx and CO content in the engine exhaust gas, since turbine engine emissions are of great concern due to their adverse impact on natural environment. Experimental results are followed by the engine cycle parametric study for real engine thermodynamic cycle. Finally, future work plans regarding variable combustor chamber utilization for emission reduction from small gas turbine are discussed.
Źródło:
Journal of KONES; 2015, 22, 1; 47-54
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A test bench setup with programmable trajectory for IMU-based dataglove development
Autorzy:
Mańkowski, T.
Tomczyński, J.
Kaczmarek, P.
Powiązania:
https://bibliotekanauki.pl/articles/973058.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
dataglove
test bench
IMU
MARG
Universal Robots
UR3
Opis:
This paper presents a test bench created during development of an IMU-based dataglove. The system allows gathering synchronised hand phantom posture and trajectory, together with inertial sensor data for evaluation of posture recognition algorithms. The setup includes an inertial measurement system, with IMU modules designed to be mounted on human hand or a phantom, together with proper embedded firmware and PC software. The system uses a collaborative Universal Robots UR3 robot arm for generation of trajectories and as a source of ground truth data. The program used to control the robot together with a method of gathered data synchronisation are described. The test bench has been successfully used during development of a joint angles estimating algorithm.
Źródło:
Measurement Automation Monitoring; 2016, 62, 5; 178-180
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of structural features on vibration of the propeller engine test bench
Autorzy:
Ostapski, W.
Aromiński, A.
Tułodziecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/280586.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
propeller engine test bench
propeller vibration
digital modelling
CAD
construction
Opis:
The paper concerns the prototype of a propeller engine test bench stand designed for durability tests of airplane piston engines of 150-250 kW power range (Ostapski, 2011b, 2008). The technical data of the prototype engines to be tested on the bench have been adopted. It is obvious that at the beginning of the design process there is no information about the vibration spectrum of the propeller shaft, which is at the production process at that time. The basic 3D model of test bench constructional variants are presented in the article. Modes and frequencies of free vibrations are defined in ANSYS environment for both the loaded and unloaded structure and for various design variants. The estimated vibration frequency range for the propeller shaft varies from ƒ = 22 to ƒ = 360 Hz. In such a case, there is no easy way for rational test bench construction to be completely “untuned” to the vibration forcing load. This is the reason for introducing the basic model and few its modifications. After first engine tests, it should be possible to separate natural vibrations of the bench and high amplitude vibrations of the engine.
Źródło:
Journal of Theoretical and Applied Mechanics; 2015, 53, 1; 27-36
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza porównawcza procedur zadawania momentu obrotowegona hamowni silnikowej
Comparative analysis of procedures for engine torque control on a test bench
Autorzy:
Pietras, D.
Powiązania:
https://bibliotekanauki.pl/articles/157162.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
hamownia silnikowa
badania silników
test bench
engine tests
Opis:
Współczesne silnikowe stanowiska hamownicze stwarzają szerokie możliwości w symulowaniu rzeczywistych warunków pracy badanych silników oraz zapewniają szerokie możliwości pomiarowe z wykorzystaniem bardzo specjalistycznego sprzętu pomiarowego. Dokładność utrzymywania przez hamulec zadanych nastaw regulacyjnych: prędkości obrotowej oraz obciążenia istotnie wpływa na wyniki realizowanych badań doświadczalnych, dla których wymagana jest duża powtarzalność i dokładność pomiarowa. W artykule przedstawiono analizę porównawczą dwóch procedur badawczych: zadawania momentu oraz zadawania przyspieszenia, stosowanych w badaniach silników na stanowisku hamowniczym z punktu widzenia ich wpływu na wskaźniki pracy silnika, zawartość składników spalin i zadymienie. Ponadto omówione zostało stanowisko badawcze, oraz system sterowania hamownią.
Strict requirements of the exhaust emission standards as well as the ongoing drive towards fuel consumption reduction, while improving performance, are the main modern development goals placed on internal combustion engines manufacturers. Addressing this task requires the use of sophisticated research instruments of high accuracy for scientific investigations and development work. Hence, a well chosen engine test bench is also very important. Modern engine test benches create significant opportunities for simulating real working conditions of the engine under investigation, and ensure the extensive measurements capabilities, using highly specialised measuring equipment. The controlling accuracy of engine dynamometer parameters (such as rotational speed and load) influences significantly the results of experimental studies carried out for which high repeatability and accuracy of measurements are required. The paper presents a comparative analysis of two test procedures: torque and acceleration control, both of which are used for engine investigations, in terms of their impact on the indices of engine operation, exhaust emissions and smoke. The engine test bench and the dynamometer control system are also discussed.
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 3, 3; 221-224
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of dynamic characteristics of an experimental bench of high-pressure water fracturing assisted cutting
Autorzy:
Liu, Zhiming
Zhang, Qiang
Sun, Yuliang
Liu, Junming
Powiązania:
https://bibliotekanauki.pl/articles/2200892.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
high-pressure water fracturing
experimental bench
dynamic characteristics
Opis:
Aiming at the problem that the cutting efficiency of a drum shearer is low when mining hard coal seams, an experimental bench of high-pressure water fracturing assisted cutting is designed. Compared with normal ones, the maximum equivalent stress of the improved experimental bench is reduced by 55.38%, and the maximum total deformation is reduced by 27.23%. According to the results of dynamic response analysis, it is concluded that the experimental bench of high-pressure water fracturing assisted cutting is stable and reliable under extreme working conditions, and meets design requirements for strength and stiffness.
Źródło:
Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 317--330
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Skład sądu drugiej instancji w postępowaniu cywilnym
Second instance court’s bench composition in civil proceedings
Autorzy:
Łazarska, Aneta
Powiązania:
https://bibliotekanauki.pl/articles/2200522.pdf
Data publikacji:
2022-08-01
Wydawca:
Uczelnia Łazarskiego. Oficyna Wydawnicza
Tematy:
bench composition
one-person composition
collective composition
judicial independence
order of a court president
invalidity of a bench composition
invalidity of a proceeding
skład sądu
skład jednoosobowy
skład kolegialny
niezawisłość sędziowska
zarządzenie prezesa
niezmienność składu
nieważność postępowania
Opis:
Celem artykułu jest omówienie skutków nowelizacji Kodeksu postępowania cywilnego, wprowadzonych Ustawą z dnia 28 maja 2021 r. w zakresie zmiany składu sądu w postępowaniu apelacyjnym. Nowe rozwiązania budzą liczne kontrowersje i w wielu aspektach ingerują w niezawisłość sędziowską. Po pierwsze, odwracając zasadę składów kolegialnych na rzecz jednoosobowych, nie zapewniono wystarczających gwarancji kontynuacji tak zwanych starych spraw w niezmienionym składzie, co może naruszać zasadę niezmienności składów. Po drugie, powierzając wyłącznie czynnikowi administracyjnemu prezesowi sądu decydowanie o składzie sądu, nie zapewniono wystarczających gwarancji poszanowania niezawisłości sędziowskiej. Sprzeciw budzi decydowanie przez prezesa sądu o tym, czy zachodzi potrzeba wyznaczenia składu z uwagi na szczególną zawiłość lub precedensowy charakter sprawy. Nie jest rzeczą prezesa ocenianie charakteru sprawy, którą rozstrzyga sędzia. Kwalifikowane przesłanki zaś do ustanowienia składu kolegialnego sprawią, że przedmiotowa regulacja będzie niezwykle rzadko stosowana.
The aim of the article is to discuss the effects of the amendment to Code of Civil Procedure introduced by Act of 28 May 2021 within the scope of a change of a court bench compositionin appeal proceedings. The new solutions are controversial and in some aspects interfere with the principle of judicial independence. By reversing the principle of a collective composition infavour of a one-person composition, there were insufficient guarantees for the continuation ofthe so-called unchanged bench composition for old cases, which may violate the principle of invariability of a bench composition. Secondly, entrusting a decision on a court composition to a court president that is an administrative body did not provide sufficient guarantees forrespect for judicial independence. A court president’s decision on whether it is necessary to designate a bench due to the complexity or precedent-like nature of a case also raises objections. It is not within a court president’s competence to assess a nature of a case on which a judge adjudicates. On the other hand, classified conditions for establishing collective benches cause that the discussed regulation will be very rarely applied.
Źródło:
Ius Novum; 2022, 16, 2; 130-151
1897-5577
Pojawia się w:
Ius Novum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of bench press at a specified movement tempo on post-exercise testosterone and cortisol levels
Autorzy:
Studencki, Marcin
Ignatjeva, Angelina
Nitychoruk, Magdalena
Gołaś, Artur
Smółka, Wojciech
Maszczyk, Adam
Powiązania:
https://bibliotekanauki.pl/articles/1933110.pdf
Data publikacji:
2021-11-03
Wydawca:
PPHU Projack Jacek Wąsik
Tematy:
testosterone
cortisol
movement tempo
bench press
Opis:
Body response is a key element of the periodization of any training unit. The main control systems in the human body are the nervous and endocrine systems. The study aims to examine the effect of bench press at a specified movement tempo on post-exercise blood testosterone and cortisol levels. The study involved 16 men (experience in resistance training 5.5 ± 1.3 years, aged 24 ± 2 years, body weight 86.1 ± 7.2 kg, and 1RM 125 ± 17 kg). The first stage of the test focused on determining the maximum force based on a single bench press with the highest possible external load (1RM). The second stage included the main test, i.e. bench press. The participants were asked to perform 5 sets successively, with an external load of 70% of an individual 1RM and as many repetitions as possible. The tempo of the exercise was precisely specified. The metronome was used to set a bench press tempo. The movement tempo included time under tension (TUT) 2/0/2/0. TUT means the total time of muscle tension during one repetition. The tests showed significant changes in cortisol levels recorded 30 minutes after exercise, amounting to 13.75 (±4.60) at F=9.16 and p=0.006. and 60 minutes after exercise, amounting to 11.37 (±4.17) at F=19.46 and p=0.0002. No significant statistical values were found for testosterone levels. This study brings additional evidence of the importance of hormonal responses in muscle strength training.
Źródło:
Physical Activity Review; 2021, 2, 9; 111-119
2300-5076
Pojawia się w:
Physical Activity Review
Dostawca treści:
Biblioteka Nauki
Artykuł

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