Modeling and evaluation of a threshing drum under vertical vibration
DOI:
https://doi.org/10.15282/jmes.12.2.2018.19.0331Keywords:
Threshing drum; stability analysis; transmissibility; vertical vibration; dynamics behavior.Abstract
A threshing drum in a power thresher has a main function for separating seeds from stems via threshing teeth. This part undergoes with high exposure of vibrations, which has a greater chance to work improperly and experiences a fatigue failure that can reduce the efficiency. The main objective of this paper is to obtain vibration characteristics of the proposed design of the threshing drum. In order to achieve the objective, the threshing drum is to be modeled as an equivalent spring and a mass, which is coupled in series mode with equivalent springs and dampers generated from bearings. The mathematical models of the system are derived only in vertical direction. The transfer function approach is established to obtain time and frequency domain analysis. Force and displacement transmissibility are plotted in the wide range of frequencies to perform transmitted force to the main frame, while vertical vibration exposures are evaluated based on ISO 2372. The result shows that the threshing drum design is in the good criterion that means the Root Means Square of the velocity lying
from 0.11 m/s to 2.8 m/s taken from vibration severity index in the range of 400 rpm to 1000 rpm.
References
Cacciola S, Agud IM, Bottasso CL. Detection of rotor imbalance, including root cause, severity and location. Journal of Physics: Conference Series. 2016;753:072003-8.
Yamamoto GK, da Costa C, & da Silva Sousa JS. A smart experimental setup for vibration measurement and imbalance fault detection in rotating machinery. Case Studies in Mechanical Systems and Signal Processing. 2016;4:8-18.
Deng H, Diao Y, Zhang J, Zhang P, Ma M, Zhong X, Yu L. Three-dimensional identification for unbalanced mass of rotor systems in operation. Applied Sciences. 2018;8(2):173.
Enginoglu O, Ozturk H. Active vibration reduction of rotating machinery using a new mass distribution control system design. Proceedings of the INTER- NOISE 2016, 2016;InterNoise16:16864-874.
Zhong T, Yaoming L, Zhenwei L. Optimal parameters prediction and control of rice threshing for longitudinal axial threshing apparatus. Transactions of the Chinese Society of Agricultural Engineering. 2016;32(22):70-76.
Yang Y, Xie R, Liu Q. Design of a passive damper with tunable stiffness and its application in thin-walled part milling. The International Journal of Advanced Manufacturing Technology. 2016;89(9-12):2713-2720.
Mohamad N, Yaakub J, Ab Maulod HE, Jeefferie AR, Yuhazri MY, Lau KT, Ahsan Q, Shueb MI, Othman R. Vibrational damping behaviors of graphene nanoplatelets reinforced NR/EPDM nanocomposites, Journal of Mechanical Engineering and Sciences. 2017; 11(4): 3274–3287.
Tawi KB, Supriyo B, Ariyono S, Husain NA, Hamid ARA, Mazali II, Kob MSC. Design of electro-mechanical dual-acting pulley continuously variable transmission. Journal of Mechanical Engineering and Sciences, 2015; 8(1): 1332–1342.
Kubas K. A model for the dynamic analysis of a belt transmission using the Dahl friction model. Journal of Theoretical and Applied Mechanics. 2017;55(4):1423-1435.
Genta G, Genta A. “Road Vehicle Dynamics”. 2017.
Htay TT, Win HH, Win ZEE. Dynamics stiffness of shaft for thresher in combine harvester. International Journal of Mechanical and Production Engineering. 2015;3(7):140-144.
Zeillinger R, Köttritsch H. Damping in a rolling bearing arrangement. Evolution, 1996;1996(1).
Close CM, Frederick DH, Newell JC. “Modelling and Analysis of Dynamic Systems (3rd ed)”. 2002.
Rao SS. “Mechanical Vibrations (6th ed)”. 2017.
Nise NN. “Control Systems Engineering (7th ed)”. 2015.
Hallauer W. “Introduction to Linear, Time-Invariant, Dynamic Systems for Students of Engineering”. 2016.
Ab Latif N, Rus AZM. Vibration Transmissibility Study of High Density Solid Waste Biopolymer Foam. Journal of Mechanical Engineering and Sciences. 2014; 6(1):772–781.
Schlarmann ME, Geiger RL. Relationship between amplifier settling time and pole-zero placements for second-order systems. Proceedings of the 43rd IEEE Midwest Symposium on Circuits and Systems. 2000;54-59.
Yang J. Force transmissibility and vibration power flow behaviour of inerter- based vibration isolators. Journal of Physics: Conference Series. 2016;744:012234-9
Published
How to Cite
Issue
Section
License
Copyright (c) 2018 The Author(s)
This work is licensed under a Creative Commons Attribution 4.0 International License.
