scholarly journals Effect of Particle Material, Size and Filling Percentage on Particle Damping Phenomenon for Gear Transmission System

2021 ◽  
Vol 9 (VI) ◽  
pp. 3740-3753
Author(s):  
Shivraj R. Kumbhar
Keyword(s):  
Transmission System ◽  
Gear Transmission ◽  
Control Technology ◽  
Present Stage ◽  
Passive Vibration Control ◽  
Damping Effect ◽  
Particle Material ◽  
Gear Transmission System ◽  
Particle Damping ◽  
Simulation Results

Particle damping is a passive vibration control technology. At the present stage, particle damping technology is developing especially in machinery and aerospace fields. For studying the particle damping effect different parameters such as particle material, size and filling percentage is used. One of the applications for particle damping phenomenon is gear transmission system. For simulation of particle damping discrete element method (DEM) software is used. The simulation results have been validated by comparing with experimental results of a physical system. Find damping effect due to particle damping from simulation and experimentation.

scholarly journals Design and Development of Particle Friction and Impact Damping for Spur Gear Drive

2021 ◽  
Vol 9 (VI) ◽  
pp. 649-655
Author(s):  
Nawaj I. Mulla ◽  
Vishal V. Dhende
Keyword(s):  
High Speed ◽  
Spur Gear ◽  
Transmission System ◽  
Gear Transmission ◽  
Particle Collisions ◽  
Dem Simulation ◽  
Vibration Absorption ◽  
Gear Transmission System ◽  
Particle Damping ◽  
Impact Damping

Gear transmission system plays an important role in many of the mechanical systems. Vibration is the major problem and unavoidable in gear transmission system because high speed and heavy loading condition. High temperature and harsh working condition limits the other vibration absorption methods. Particle friction & impact damping is passive method of vibration absorption. Ordinary particle damping method gives the random movement of particles. In this research holes are provided to the gear and put cylindrical impact particles in particular hole gives the friction and impact effect to absorb the vibration. The mathematical analysis is formulated for the system also run MATLAB program and found out plot for displacement v/s time. DEM simulation carried out using EDEM software which is used to perform simulations at different speed and to analyze the energy dissipation during particle collisions and compared the energy absorbed by the particles of different materials for varying speed.

scholarly journals Dynamic characteristics analysis of planetary gear system with internal and external excitation under turbulent wind load

2021 ◽  
Vol 104 (3) ◽  
pp. 003685042110356
Author(s):  
Hexu Yang ◽  
Xiaopeng Li ◽  
Jinchi Xu ◽  
Zemin Yang ◽  
Renzhen Chen
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Nonlinear Dynamic ◽  
Planetary Gear ◽  
Wind Load ◽  
Transmission System ◽  
Gear Transmission ◽  
Stiffness Ratio ◽  
Gear Transmission System ◽  
Planetary Gear System

According to the working characteristics of a 1.5 MW wind turbine planetary gear system under complex and random wind load, a two-parameter Weibull distribution model is used to describe the distribution of random wind speed, and the time-varying load caused by random wind speed is obtained. The nonlinear dynamic model of planetary gear transmission system is established by using the lumped parameter method, and the relative relations among various components are derived by using Lagrange method. Then, the relative relationship between the components is solved by Runge Kutta method. Considering the influence of random load and stiffness ratio on the planetary gear transmission system, the nonlinear dynamic response of cyclic load and random wind load on the transmission system is analyzed. The analysis results show that the variation of the stiffness ratio makes the planetary gear have abundant nonlinear dynamics behavior and the planetary gear can get rid of chaos and enter into stable periodic motion by changing the stiffness ratio properly on the premise of ensuring transmission efficiency. For the variable pitch wind turbine, the random change of external load increases the instability of the system.

Analysis on Vibration Response of Gear Transmission System

2011 ◽  
Vol 65 ◽  
pp. 177-181
Author(s):  
Jia Hong Zheng ◽  
Min Li
Keyword(s):  
Transmission System ◽  
Vibration Response ◽  
Gear Transmission ◽  
Wind Generators ◽  
Gear Transmission System ◽  
Internal Incentive ◽  
External Incentive

The inherent characteristics of the wind generators growth gearbox were solved, then the reasons which caused the gear transmission system generating dynamic incentive was analyzed, and also internal incentive and external incentive were given to 2MW wind generators gear transmission system quantitatively. On the basis of these, 2MW wind generators growth gearbox system’s vibration response caused under internal incentive and external incentive was solved and analyzed.

Analysis of Stochastic Nonlinear Dynamics in the Gear Transmission System with Backlash

2015 ◽  
Vol 16 (2) ◽  
pp. 111-121 ◽  
Author(s):  
Jingyue Wang ◽  
Haotian Wang ◽  
Lixin Guo
Keyword(s):  
Time Course ◽  
Damping Ratio ◽  
Excitation Frequency ◽  
Period Doubling ◽  
Spur Gear ◽  
Transmission System ◽  
Gear Transmission ◽  
Stochastic Dynamic ◽  
Random Disturbance ◽  
Gear Transmission System

AbstractIn order to study the different backlash, gear damping ratio and random disturbance on dynamic behavior of gear transmission system, stochastic dynamic equations of the three-degree-of-freedom spur gear transmission system are established considering random disturbances of a low-frequency external excitation induced by torque fluctuation, gear damping ratio, gear backlash, excitation frequency and meshing stiffness. Using bifurcation diagram, phase diagram, time course diagram, Poincaré map and power spectrum of the system, the dynamic characteristics of the gear transmission system with different backlash under gear damping ratio changing, and the influence of the random disturbance of gear damping ratio on the bifurcation characteristic of system are analyzed. Numerical simulation shows that the gear transmission system will be from periodic motion with a noisy disturbance to chaotic-like motion by period-doubling bifurcation with decreasing gear damping ratio. In the small damping ratio range, the backlash has great effect on the motion characteristics. Random disturbance has an important effect on the bifurcation characteristics.

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