scholarly journals Characteristics of Low Frequency Non-Synchronous Vibrations Induced by an Epicyclic Gearbox in Gas Turbogenerator Applications

1998 ◽  
Author(s):  
A. K. Rakhit ◽  
G. A. Cornejo ◽  
G. J. Lack
Keyword(s):  
Low Frequency ◽  
Output Shaft ◽  
Power Train ◽  
Backward Whirl ◽  
Considerable Length ◽  
Potential Damage ◽  
Generator Sets ◽  
Star Configuration ◽  
Train System ◽  
Total Elimination

Epicyclic gearboxes of star configuration running at partial loads were found to induce non-synchronous (not related to speed) low-frequency vibrations, besides low level sub-synchronous (speed related) which were transmitted to other parts of a turbogenerator power train. At certain loads, the amplitudes of the non-synchronous vibrations were high enough to cause potential damage to sleeve bearings used in the power train system if a generator set would run for any considerable length of time at these loads. It was also observed that a very small increase in load above a certain limit (about 18% of full load) resulted in almost total elimination of these vibrations. Analysis of test data showed the non-synchronous vibrations were due to ‘backward whirl’ motion of gearbox output shaft in its sleeve bearings. Higher damping in the bearings was considered to be one of the most effective methods to suppress backward whirl of a shaft and hence, the non-synchronous vibrations. Accordingly, a new set of gearbox output shaft sleeve bearings was designed for higher damping that would allow these types of generator sets to run at partial and full loads without any detrimental vibration.

Advances in the Power train System of Honda FCX Clarity Fuel Cell Vehicle

2009 ◽  
Author(s):  
Minoru Matsunaga ◽  
Tatsuya Fukushima ◽  
Kuniaki Ojima
Keyword(s):  
Fuel Cell ◽  
Fuel Cell Vehicle ◽  
Power Train ◽  
Train System

The Simulation on the Power Train System of the Hybrid Horizontal Directional Driller

2011 ◽  
Vol 127 ◽  
pp. 233-236
Author(s):  
Tao He ◽  
Li Xin Meng ◽  
Zhi Qiang Liu
Keyword(s):  
Hybrid System ◽  
Developed Countries ◽  
Power Train ◽  
Working Cycle ◽  
Rapid Construction ◽  
Control Goal ◽  
Parallel Hybrid ◽  
The Developed Countries ◽  
Train System ◽  
Engine Power

As technology and equipment improves, the horizontal directional driller was gradually accepted in the developed countries in the 1980s. With the rapid construction of urbanization, non-excavating technology is widely used in China. In this paper, a new kind of hybrid technology in the horizontal directional driller is presented. Taking HL518B as a prototype, a parallel hybrid system is designed .The control strategy of the hybrid horizontal directional driller is analyzed on the basis of the several operations in the working cycle. The control goal of whole system is to realize the torque demand of loading. Research is made on how to transform the single engine power into the hybrid power train, At same time the model of hybrid system is established and simulated. The simulation results show the hybrid system can effectively improve the horizontal directional driller fuel economy.

Hybrid modelling and simulation of the torsional vibration of vehicle driveline systems

2001 ◽  
Vol 215 (2) ◽  
pp. 217-229 ◽  
Author(s):  
A Farshidianfar ◽  
M Ebrahimi ◽  
H Bartlett
Keyword(s):  
Degrees Of Freedom ◽  
Governing Equations ◽  
Dynamic Interactions ◽  
Hybrid Modelling ◽  
Power Train ◽  
Lumped Model ◽  
Vibration Responses ◽  
Gear Contact ◽  
Many Sources ◽  
Train System

Vehicle drivelines are lightly damped non-linear systems possessing many degrees of freedom with dynamic interactions between the various subsystems. There are many sources of excitation such as torsional impact caused by the take-up of backlash in the power train system. Such sources of excitation exist in transmission backlash, in driveline splines and in pinion to ring gear contact in the differential. Abrupt application or release of the throttle in slowly moving traffic or rapid engagement of the clutch can be followed by noise and vibration responses referred to in the industry as ‘clonk’. This paper presents a method of modelling a vehicle driveline which can identify the phenomena known as ‘clonk’ and ‘shuffle’. This model is based on the assumption that vehicle drivelines can be considered as partially lumped and partially distributed, which for systems of this type is wholly appropriate. In doing this it is possible to derive an analytical solution to the governing equations, which has not been considered previously. The results from this model are compared with a totally lumped model of the vehicle driveline for comparison.

Automatic Gearshift Algorithm and Its Dynamic Performance Simulation of Tracked Vehicle With Integrated Power Train System

2006 ◽  
Author(s):  
Huabing Yin ◽  
Jingling Fan ◽  
Lichen Hu ◽  
Xiaofneg Ma
Keyword(s):  
Virtual Prototyping ◽  
Modeling Method ◽  
Tracked Vehicle ◽  
Development Environment ◽  
Power Train ◽  
Matlab Simulink ◽  
Planetary Gearbox ◽  
Virtual Test ◽  
Physical Tests ◽  
Train System

The automatic gearshift algorithm and its dynamic control is an important research area in tracked vehicle design. In the paper the models of power train system such as engine, transfer gearbox, hydraulic torque converter, planetary gearbox, running gear propulsion system and virtual terrain are built. The program for gearshift algorithm design is developed. The model of designed gearshift algorithm is developed with MATLAB/simulink and finite state machine theory. The hydraulic control system is modeled with MATLAB/simulink and the oil pressures can be applied on the clutches and brakes of power train system. The planetary gearbox and other transmission parts are modeled through EASY5 power train library models and the gear contact stiffness, torsional stiffness of links between planetary gear sets and shafts are taken into consideration. The running gear system model are built with ADAMS, and the terrain loads from the interaction between terrain and tracks are applied on the sprocket extended to the power train, which considers the dynamic contacts among road wheel, track and terrain. Many terrain models including the slope, obstacle and road model with A, B, C, D etc. levels at different vehicle speeds can be built and integrated with the virtual prototyping models These different disciplinary models are integrated with MATLAB, ADAMS and EASY5 development environment and the virtual test can be done in various operation conditions. The integrated method is through the interfaces provided by these simulation software. It realizes the time synchronization between two different models of EASY5 and MATLAB/simulink with the digital electric circuit theory. The virtual test is been made in the integrated MATLAB/simulink development environment. The tracked vehicle's acceleration performance is simulated. The acceleration time from second gear to 32 km/h is about 14.5 seconds. Many other performances such as the virtual dynamic torque loads of rotating parts, the clutch torque capacity and the jerks of any parts in the power train can be obtained from simulation and can be verified with the physical tests later. There are some innovations in modeling method in this paper. Firstly, it builds many subsystem models with the virtual prototyping technology. Secondly, it builds the integration environment and interfaces. Many models of different areas are integrated to simulate transmission gearshift process. Thirdly, it provides a modeling method and environment for power train modeling and simulation. Fourthly, the acceleration performance of a tracked vehicle is simulated and the two results of virtual and physical tests are close.

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