Wszystkie pola: inertia - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Engine torque for acceleration of rotational mass in vehicles
Autorzy:: Ubysz, A.
Powiązania:: https://bibliotekanauki.pl/articles/246245.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: rotational mass
torque of rotational mass acceleration
mass moment of inertia
Opis:: This study presents analysis of errors of calculations for engine load during vehicle acceleration phase, resulting from some simplifications or errors in selection of mass moment of inertia. A varied impact of the assumed, on unknown basis, values of the mass moments of inertia on calculation error was shown. According to the author, more accurate results of calculations of coefficient of rotating masses delta can be obtained by means of equations which make use of mass moments of inertia for rotating masses in vehicle Is and I k rather than values of reduction ratios in gearbox, for which the calculated values of delta are inflated. This study presents an overview of methods for calculation of inertia mass in vehicles which impact on inertial resistance. Different opinions in references on rotational mass (engine with clutch mechanism and the road wheels) provided the author an impulse to verify them with respect to currently manufactured vehicles. In particular, profile of reduced mass moment of inertia of rotational masses in vehicle as a function of overall gear ratio, ranges of non-stationary engine working conditions from engine speed, characteristics of demand for engine torque needed for acceleration of rotational masses in the vehicle with acceleration of engine speed are shown in the paper.
Źródło:: Journal of KONES; 2010, 17, 4; 553-560
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Kinematic of marine piston-crankshaft system
Autorzy:: Murawski, L.
Powiązania:: https://bibliotekanauki.pl/articles/246452.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: marine propulsion system
piston-crankshaft kinematic
slow speed engines
inertia forces
propulsion system vibrations
Opis:: Two-stroke, slow speed main engines are often installed on merchant ships, because of its very high efficiency. That kind of engine has an output of about 5500 kW per cylinder. The mass of piston-crankshaft system reaches over a dozen tons. That reciprocating masses are source of high level of dynamic inertia forces (mass forces). Those forces have big influence on engines working parameters and characteristics. One of them is instability of crankshaft rotational speed, which leads to dangerous torsional vibrations of propulsion system. Some inconsistency can be observed during analysis of piston-crankshaft system kinematic. In the theoretical engine books, the piston speed and acceleration has only two harmonic components, the inertia forces are depended on engine rotation speed and they doubled rotation speed. However, empirical formulas, published by engines producers, give us at least five harmonic components of mass forces. The author tries to find out the theoretical reason of existing (measured) higher harmonic orders of engines inertia forces. It is a first step for developing monitoring system of propulsion system’s torsional vibrations coupled with axial vibration, dynamic shaft line alignment and crankshaft springing. In the paper two analytical methods of piston displacement, speed and acceleration are presented. Well-known (from literature) equations are compared with more-detailed analytical procedures. The analysis was performed for one of the biggest marine MAN B&W engine, type 7K98MC. A discussion about the analysis results was included in the final part of the paper.
Źródło:: Journal of KONES; 2015, 22, 2; 155-162
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Detection of structural damage in vibroacoustic analysis
Autorzy:: Rychlik, A.
Powiązania:: https://bibliotekanauki.pl/articles/247382.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: damage to the cross-section of a sample
diagnostic signal for identifying damage to the cross-section of a sample
inertia
Opis:: Supports are one of the most popular structural elements in engineering. They have a wide range of applications, including in pressure gauge connectors, fixtures for photovoltaic and solar panels, and traffic signs. Supports are also used in highly complex engineering projects such as airplane wings or rotor blades. Monitoring methods for detecting and predicting the condition of support structures have become an important area of research. Structural damage to machines and machine parts can be prevented through early detection of fatigue cracks with the use of non-destructive methods. The paper proposes a method for detecting fatigue cracks along the cross-sectional area of a specimen based on selected parameters of the vibration signal. The diagnostic signal for analyses of specimen cross-sectional area was vibration acceleration, which was described with the use of the following parameters: changes in amplitude and waveform (FFT), RMS amplitude, changes in the amplitude of a vibrating sample, and changes in the phase angle of a vibrating sample. In the test stand, cross-sectional damage was caused by forces of inertia acting on the specimen. The results of the study indicate that all of the analysed parameters can be used to detect the loss of structural continuity (mechanical and fatigue cracks) in an object. An analysis of changes in the amplitude of a vibrating sample was the fastest and most comprehensive source of information.
Źródło:: Journal of KONES; 2016, 23, 1; 279-287
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence of inertia moment of infantry fighting vehicle turret on accuracy of aiming at a target and tracking of a target
Autorzy:: Papliński, K. M.
Stachowicz, E.
Powiązania:: https://bibliotekanauki.pl/articles/244515.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combat vehicle
fire control system
gun stabilizer
amplitude of first overshoot
Opis:: In the paper was tested one of combat vehicles that is highly dynamic military vehicles, combining a high striking and fire power with high mobility and manoeuvrability. Were presented the mechanism of transfer of disturbance from the ground on the angular stabilized turret of the vehicle. Hull vibration caused by bumps in the ground. Angular and axial displacement of vehicle are the input signals acting on the turret and the gun. Two-axis stabilisation system compensates the velocities of the vehicle. Stabilisation system, automatically maintain the position of the turret at a fixed bearing in space. In spate of any motion of the vehicle in roll (hall transversal vibration) or in yaw (hall "snake-like" vibration). Torques and forces acting on the rigid body of combat vehicle turret are written in equations of motion. To examine the effect of mass inertia moment of the IFV turret on the size of first overshoot (to confirm the theoretical considerations) performed a simple experiment. Was measured the size of the angle of the first overshoot of the turret when braking rotating turret with a maximum angular velocity. Measurements were made on the IFV turret in the previously existing configuration, and when mounted on it extra weight. An experiment confirms the theoretical considerations. The results of measurements show that an increase of approximately 8 per cent of the mass moment of inertia of the turret causes about 16 per cent increase in the amplitude of the first overshoot.
Źródło:: Journal of KONES; 2011, 18, 1; 411-416
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The system of supercharging for the spark-ignition engine
Układ doładowania silnika o zapłonie iskrowym
Autorzy:: Mamala, J.
Jantos, J.
Brol, S.
Malewicz, K.
Bieniek, A.
Powiązania:: https://bibliotekanauki.pl/articles/243245.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: doładowanie zasobnikowe
zdolność przyspieszania
silnik spalinowy
combustion engine
powertrain systems
mechanical inertia
charging system
Opis:: The most disadvantageous system of the automobile, because of its damaging influence on environment is powertrain. This notion means engine connection with powertrain, which is very important in respect of ecology and safety. In the matter of safety very important is ability to accelerating with rapid depressed accelerator pedal. This situation takes place during overtaking process, which is caused by driving force deficiency from engine and powertrain mechanical inertia. It has negative influence on overtaking process and also on driving comfort. This phenomenon described in works, mainly come from accumulation of mechanical energy of powertrain. Numerous research centres in the world have undertaken examinations with an aim of solving this problem. However, a successful solution to this problem has to meet a number of prerequisites of technological and economic nature. The technological ones have to involve the uncomplicated construction while the economic ones are associated with the need for low cost of application of the solution put forward. The latter question is related to meeting numerous conditions and results from the effects of special testing as a result of specific operating conditions of power transmission system. In numerous research centres abroad additional energy sources including plungers or electrical motors are installed in order for the compensation of mechanical inertia. Another way of compensation for the mechanical inertia of the transmission system is gaining larger momentum from the driving unit at the time of its abrupt acceleration. A successful solution to this problem may lie in the application of an additional boost with surplus charging in the fuel supply system. They analyzed in the paper structure of the system of charging the internal-combustion engine up about the spark ignition in the purpose for the compensation for the shortage of the driving force on wheels of the car and results of preliminary research were presented.
Źródło:: Journal of KONES; 2007, 14, 2; 291-298
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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