A Calculation Method for Torsional Vibration of a Crankshafting System with a Conventional Rubber Damper by Considering Rubber Form

1996 ◽  
Author(s):  
Tomoaki Kodama ◽  
Yasuhiro Honda ◽  
Katsuhiko Wakabayashi ◽  
Shoichi Iwamoto
Keyword(s):  
Torsional Vibration ◽  
Calculation Method ◽  
Rubber Damper

The Effect on Large Container Ships’ Fatigue due to Springing Loads Coupling Horizontal and Torsional Vibrations

2018 ◽  
Author(s):  
Hui Li ◽  
Huifen Xu ◽  
Huilong Ren ◽  
Xiaoxi Shen ◽  
Yubo Wang
Keyword(s):  
Fatigue Damage ◽  
Torsional Vibration ◽  
Calculation Method ◽  
Wave Loads ◽  
Analysis Method ◽  
Element Analysis ◽  
Hull Structure ◽  
Torsional Loads ◽  
Large Container ◽  
Simplified Calculation

The issue of hydroelasticity caused by hull vibration has become an unavoidable problem in the design and verification of large ships. Driven by environmental protection and economical efficiency, the size of ships are increasingly larger, and the resulting springing and whipping response and their effects on fatigue damage has been paid more and more attention especially for ultra large container ships (ULCS). Many classification societies typically check fatigue damage caused by vertical bending when considering springing, while it needs to be emphasized that large container ships can suffer severe torsional loads compared to other large ships due to wide breath and big hatch openings. In the existing stress calculation method, the finite element analysis method obviously has a high calculation accuracy. However, there are so much work to do with FEM model established, and partially refined, operated at all sea states etc., which not only requires much time, but also higher computing equipment. Therefore, in this paper, a simplified calculation method of fatigue damage considering the effect of bending and torsion is proposed, and a 21000TEU will be calculated by this method. The wave loads on the hull structure will be estimated based on the 3D linear hydroelastic theory coupling horizontal and torsional vibration, and the stress caused by bending and torsion will be obtained respectively. Finally, the fatigue damage is calculated by spectral analysis method considering high frequency springing loads. Then the effect on large container ships’ fatigue due to bending and torsional vibration is discussed.

Vibration of diesel-electric hybrid propulsion system with nonlinear component

2018 ◽  
Vol 24 (22) ◽  
pp. 5353-5365 ◽  
Author(s):  
Nengqi Xiao ◽  
Ruiping Zhou ◽  
Xiang Xu
Keyword(s):  
Mathematical Model ◽  
Theoretical Calculation ◽  
Torsional Vibration ◽  
Calculation Method ◽  
Propulsion System ◽  
Vibration Test ◽  
Hybrid Propulsion ◽  
Harmonic Method ◽  
Shaft System ◽  
Marine Diesel

The lumped parameter method is used to model the components of a marine diesel-electric hybrid propulsion system. Modular modeling and five basic models of torsional vibration are used to establish the torsion of the diesel-electric hybrid propulsion system with a nonlinear components vibration mathematical model. In order to include the nonlinear parts of the marine diesel-hybrid propulsion shafting torsional vibration system characteristics, by combining the perturbation method with the advantages and disadvantages of the harmonic method, a perturbation-harmonic method is presented to solve the diesel-electric hybrid propulsion shafting free vibration characteristics. At the same time, the nonlinear vibration characteristics of the hybrid propulsion shaft system are calculated and analyzed using the incremental harmonic balance method. In order to verify the correctness of the theoretical method of hybrid propulsion system, the correctness of the vibration model and method is verified by carrying out actual tests on a 10,000-ton marine surveillance ship. In order to verify the mathematical model of the ship diesel-hybrid propulsion system and the correctness of the theoretical calculation method, the torsional vibration test is carried out by a strain gauge method for a 10,000-ton marine propulsion shaft. The correctness of the torsional vibration mathematical model and the calculation method is verified by comparing the torsional vibration test data and the theoretical calculation data of the ship propulsion shaft system, which provides the theoretical significance for the calculation and analysis of the torsional vibration of the ship propulsion shaft system.

Development of New Torsional Vibration Rubber Damper of Compression Type

1995 ◽  
Author(s):  
Tomoaki Kodama ◽  
Yasuhiro Honda ◽  
Katsuhiko Wakabayashi ◽  
Shoichi Iwamoto
Keyword(s):  
Torsional Vibration ◽  
Rubber Damper ◽  
Compression Type

scholarly journals Torsional Vibration Damping of Diesel Engines with a Rubber Damper Pulley.

1994 ◽  
Vol 60 (572) ◽  
pp. 1167-1174 ◽  
Author(s):  
Katsuhiko Wakabayashi ◽  
Yasuhiro Honda ◽  
Tomoaki Kodama ◽  
Kunio Shimoyamada
Keyword(s):  
Diesel Engines ◽  
Torsional Vibration ◽  
Vibration Damping ◽  
Rubber Damper

scholarly journals Torsional Vibration Damping of Diesel Engine with Rubber Damper Pulley

1995 ◽  
Vol 38 (4) ◽  
pp. 670-678 ◽  
Author(s):  
Katsuhiko Wakabayashi ◽  
Yasuhiro Honda ◽  
Tomoaki Kodama ◽  
Kunio Shimoyamada
Keyword(s):  
Diesel Engine ◽  
Torsional Vibration ◽  
Vibration Damping ◽  
Rubber Damper

An Experimental Study on Dynamic Properties of Rubber Specimens for a Crankshaft Torsional Vibration Damper of Automobiles

1999 ◽  
Author(s):  
Yasuhiro Honda ◽  
Katsuhiko Wakabayashi ◽  
Tomoaki Kodama ◽  
Hiroshi Okamura
Keyword(s):  
Torsional Vibration ◽  
Design Method ◽  
Dynamic Properties ◽  
Torsional Oscillation ◽  
Vibration Reduction ◽  
Exciting Frequency ◽  
Exciting Vibration ◽  
Damper Design ◽  
Vibration Tests ◽  
Rubber Damper

Abstract Torsional vibration occurs at a crankshaft system of operating multi-cylinder reciprocating engine in mechanism. A torsional vibration rubber damper is generally used to control or reduce the torsional vibration appearing at the crankshaft system of small diesel engine for automobile. Since automotive diesel engines have recently become engine weight lightening and higher performance output, both the amplitudes and the frequencies of the torsional vibrations generate increasingly more than before. Therefore, the torsional rubber damper should be required as one of the most important engine vibration reduction devices. The torsional vibration rubber damper must be precisely designed to match with a crankshaft system of engine with which it is mounted in order to reduce sufficiently. However, the prediction difficulty of its dynamic characteristics gives damper designers the design of a torsional rubber damper with variable experiments. While this design method requires too much time for examination of the vibration reduction effects obtained from some torsional oscillation tests, it is doubt whether the designed torsional damper will be able to sufficiently reduce the torsional vibration in variable engine operations. This paper refers to influences of rubber shape and forced frequency on properties of test rubber specimens designed for contribution to damper design. Furthermore, some important subjects on properties of rubber are described for design of shear-type torsional rubber dampers by using a rheological model. The rubber properties can be obtained from exciting vibration tests of rubber specimens with the changes of exciting frequency, amplitude and temperature. It is confirmed that the shape factor should be reduced to suppress the influence on rubber dynamic properties of external factors such as amplitude and frequency.

Design and Development of a Torsional Vibration Rubber Damper

1999 ◽  
Author(s):  
P. A. Lakshminarayanan ◽  
S. Stephen ◽  
A. D. Dani ◽  
K. M. Kale ◽  
J. G. Kulkarni
Keyword(s):  
Torsional Vibration ◽  
Design And Development ◽  
Rubber Damper

Torsional Vibration Extraction of Dual-Period Instantaneous Angular Speed Measurement of the Generalized Incremental Encoder

2021 ◽  
Author(s):  
Zhang Yuhao ◽  
Yujiong Gu ◽  
Pengcheng Zhao ◽  
Dongchao Chen ◽  
Kun Yang
Keyword(s):  
Torsional Vibration ◽  
Calculation Method ◽  
Vibration Signal ◽  
Angular Speed ◽  
Angular Motion ◽  
Signal Sampling ◽  
Time Component ◽  
Instantaneous Angular Speed ◽  
Incremental Encoder ◽  
The Relationship

Abstract Torsional vibration is key information in monitoring the condition of the shaft system. Using the vector superposition principle, the relationship between the rotation motion and the torsional vibration of the shaft is analyzed. This paper proposes a generalized incremental encoder model and constructs a piecewise function to describe the principle of the pulse output type speed measuring device. The incremental encoder uses a fixed angular increment to stamp the time component of the angular motion of the shaft, thereby establishing a discrete relationship between the angular motion of the shaft and the time component. The relationship between the angular resolution of the encoder and the torsional vibration signal sampling theorem is deduced. The asymmetric under-sampling of the torsional vibration signals is explained from the perspective of signal sampling. According to the index period invariance of the reconstruction of the encoder disc angle sequence, a double-period instantaneous angular speed (IAS) calculation method is proposed, which uses all the time stamps, avoiding the sampling bandwidth idle caused by the single period method, causing the torsional vibration signal to obtain more detailed information, and its analysis bandwidth is twice that of the single-period method. Simulation and experiment verified the correctness and superiority of the research content. Finally, the calculation method was packaged as a functional module and embedded in an online torsional vibration monitoring device applied to two 1000Mw nuclear power turbine generator sets.

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