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Torsional vibrations
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Part 1 book "Aircraft structures for engineering students" includes content: Basic elasticity, two dimensional problems in elasticity, torsion of solid sections, virtual work and energy methods, energy methods, matrix methods, bending of thin plates, columns, thin plates, structural vibration, materials, structural components of aircraft, airworthiness, airframe loads, fatigue, bending of open and closed, thin-walled beams, shear of beams, torsion of beams, combined open and closed section beams, structural idealization.
601p
dianmotminh01
20-05-2024
2
2
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Part 1 book "Aircraft structures for engineering students" includes content: Basic elasticity, two dimensional problems in elasticity, torsion of solid sections, virtual work and energy methods, energy methods, matrix methods, bending of thin plates, columns, thin plates, structural vibration, materials, structural components of aircraft.
406p
dianmotminh01
20-05-2024
2
0
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The Freedom Torsional Vibrations (FTV) Calculation (FTVC) for the marine main propulsion plant (MPP) to determine the freedom frequencies and the FTV formations of the mechanical system. The research verifies to the MMP on the Korean ship XXX-XXX-XXX, using the MDE 6G70MEC.
5p
vijaychest
24-04-2024
6
3
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Continued part 1, part 2 of ebook "Mechanical engineering principles" provides readers with contents including: dynamics; linear and angular motion; linear momentum and impulse; force, mass and acceleration; work, energy and power; friction; motion in a circle; simple harmonic motion; simple machines; heat transfer and fluid mechanics; heat energy and transfer; thermal expansion; the measurement of temperature;...
160p
hanlinhchi
29-08-2023
7
2
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The model is built to analyze and calculate the torsional vibration of the internal combustion engine shaft system and the generator connected by hard coupling to assess the response to the free and forced vibration of the shaft system, thereby serving as a basis for devising a suitable plan to reduce or avoid the problem of shaft torsion vibration.
6p
vifalcon
18-05-2023
8
3
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The paper presents a theoretical basis and algorithms of determining the torsional vibration damping coefficients of the engine structure, shaft material and hydrodynamic damping coefficient to propellers from results of vibration measurements.
7p
wangxinling
23-07-2021
13
1
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This paper presents three analytical methods to determine optimal parameters of the passive mass-springdisc dynamic vibration absorber (DVA), such as the ratio between natural frequency of DVA and shaft, damping ratio of DVA. The original model presented by Den Hartog, Luft and Warburton are solved and has shown in good agreement. Three analytical methods is then adopted for torsional shaft model.
6p
cothumenhmong11
10-05-2021
17
2
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This paper studies to determine the optimal parameter of the tuned mass damper to reduce the torsional vibration for the rotating shaft with variable angular velocity by using the maximization of equivalent viscous resistance method.
4p
kequaidan11
13-04-2021
17
1
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This paper presented a combined theoretical and experimental design methods to determine optimal parameters of a centrifugal pendulum vibration absorber (CPVAs), such as spring stiffness, damper oil viscosity, moment of uinertia of the system components, number of absorbers and assembly position. First, the system of equations of motion of the CPVA was established and solved using Finite Element method (FEM) and Runge-Kutta algorithm (RKA).
7p
chauchaungayxua11
23-03-2021
10
2
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This paper presented a method to reduce the torsional vibration of a shaft system with dynamic vibration absorber (DVA). A theoretical method was introduced to determine optimal parameters of the DVA, which included spring stiffness, viscous coefficient of damper, mass moment of inertia of the absorber, number, and radial position of springs and dampers. First, system equations of motion of the shaft and the DVA were elaborated using Finite Element method (FEM) and solved by Runge-Kutta algorithm to find the torsional vibration response.
6p
chauchaungayxua11
23-03-2021
12
1
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The performance of the proposed optimal DVA is compared with that obtained by existing optimal solution in literature. It is shown that the proposed optimal parameters are possible to obtain superior vibration suppression compared to existing optimal formula. Extended simulations are carried out to examine the performance of the optimally designed DVA and the sensitivity of the optimum parameters. The simulation results show that the improvement of the vibration performance on damped rotary system can be as much as 90% by using DVA.
17p
trinhthamhodang9
10-12-2020
15
1
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The paper analyzes and determines the optimal parameters of tuned mass damper to reduce torsional vibration for the machine shaft. The research steps are as follows. First, the optimal parameters of tuned mass damper for the shafts are given by using the maximization of equivalent viscous resistance method. Second, a numerical simulation is performed for configuration of machine shaft to validate the effectiveness of the obtained analytical results. The simulation results indicate that the proposed method significantly increases the effectiveness of torsional vibration reduction.
9p
cothumenhmong8
04-11-2020
16
1
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The torsional vibration phenomenon in the running gear of reciprocating engine systems is usually dealt with by considering a series of constant inertias connected by sections of massless shafting. However in reality, a slider crank mechanism is a vibrating system with varying inertia because the effective inertia of the total oscillating mass of each crank assembly varies twice per revolution of the crankshaft.
11p
12120609
01-06-2020
11
0
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This calculation is done because of the emergence of harmonics on a 3-phase induction motor that has exceeded the standard limit, so it must reduce the harmonics. Moreover, disturbances that occur, such as torsion vibrations caused by the interaction of the fundamental harmonic magnetic field, causing higher noise.
10p
lucastanguyen
28-05-2020
9
0
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This paper presents an analytical method to determine optimal parameters of tuned mass damper (TMD), such as the ratio between natural frequency of TMD and shaft, the ratio of the viscous coefficient of the TMD. Two novel findings of the present study are summarized as follows. First, the optimal parameters of the TMD for the shafts are given by using the fixed-point theory (FPT). Next, a numerical simulation is done for an example of the machine shaft to validate the effectiveness of the results obtained in this study.
5p
sabiendo
06-02-2020
29
0
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The dissertation aims to study to reduce torsional vibration for the shaft The machine is equipped with DVA (dynamic vibration absorber) oscillator, mass disk type - spring - viscous. To know more details of the content please refer to the thesis summary.
32p
xacxuoc4321
11-07-2019
23
3
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This study mainly focuses on the structural design optimization of the 4th-generation reactor coolant pump, including analysis of external characteristics, inner flow, and transient characteristic. It was found that: the reactor coolant pump with a central symmetrical dual-outlet volute structure has better radialdirection balance, the pump without guide vane has better hydraulic performance, and the pump with guide vanes has worse torsional vibration and pressure pulsation.
10p
minhxaminhyeu3
12-06-2019
13
0
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Bài báo phân tích và thiết kế khung phần mềm tự động tính dao động xoắn (Torsional Vibrations, TV) hệ trục diesel tàu thủy. Phần mềm đảm bảo các yêu cầu của cơ quan Đăng kiểm Việt Nam cũng như quốc tế về TV hệ trục desel tàu biển.
4p
vidoraemi2711
18-06-2019
46
6
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Bài báo đưa ra phương pháp tính dao động xoắn tự do (Freedom Torsional Vibrations, FTV) của hệ trục có cản và khi thay đổi mô men quán tính khối lượng (MMQTKL) của một trong các xi lanh.Tiến hành tính FTV trên hệ trục diesel máy chính lai chân vịt cho tàu Hà Tiên.
4p
vidoraemi2711
18-06-2019
49
0
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In this paper our objective is to examine simple resonance solutions for a torsional vibration system of three variable generalized masses by using the small parameter method [5].
7p
chikychiky
01-11-2018
24
0
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