Abstract
There are many problems of vibration and noise in combine working. As the main power source and excitation source of a combine, the working state of an engine directly affects the reliability and stability of the whole harvester. In order to analyze the vibration response characteristics of a chassis frame under engine excitation, the vibration mechanism and theoretical excitation characteristics of an engine vibration source on a crawler combine harvester are analyzed in this paper, and the vibration response of chassis under engine excitation is tested and analyzed. After theoretical derivation, a two-degree-of-freedom dynamic model of an engine and chassis is established. The experimental results show that the up and down vibration generated by the engine is the main vibration source in the Z direction, and the main excitation frequency is the second-order firing frequency. This paper provides a theoretical reference and experimental basis for vibration reduction and noise reduction of combine and vibration characteristics of the chassis frame.
Highlights
The crawler grain combine harvester is a complex large-scale agricultural harvester which integrates the functions of harvesting, threshing, separation, and cleaning [1,2,3]
Türkay and Akçay studied the random dynamic vibration characteristics of a 1/4 vehicle model and pointed out the influencing factors of vehicle random vibration [10]; Mareta et al established the vibration model of a 1/4 vehicle suspension system, derived the vibration differential equation, and studied the vibration isolation performance of the vehicle suspension system by inputting typical vehicle parameters [11]; Shehata et al used MATLAB/Simulink to solve the mathematical model and motion equation of the quarter vehicle suspension system [12]; Karaoglu and Kuralay carried out stress analysis and experimental research on the truck chassis frame based on the finite element analysis software and optimized the structural parameters of the frame [13]; Chen et al took the rice combine as the research object
The International Journal of Rotating Machinery dynamics was developed in MATLAB simulation analysis of excitation parameters and vibration response of the model [14]
Summary
The crawler grain combine harvester is a complex large-scale agricultural harvester which integrates the functions of harvesting, threshing, separation, and cleaning [1,2,3]. The vibration response of the combine frame under the multisource excitation was deduced, and the dynamic model of the combine frame with a 7-DOF rigid body was established. The vibration test of the chassis and the engine under multiple working conditions is carried out, and the vibration response is analyzed It provides the theoretical basis for the vibration mechanism research of the crawler combine and provides the experimental basis for vibration response research of the chassis. It has a certain reference value for the vibration reduction and noise reduction and structure optimization of the harvester
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