Application Research On Structure Optimization And Vibration Reduction Of The Forklift 30-A

Forklift, as multi-purpose and high maneuverability material handling machinery, has been widely used. When competition in the market is fierce, the domestically-produced forklifts haven't been installed special damping devices. The cab has intense vibration under working conditions, which has affected the working stability of the forklift and operation comfortableness.Aiming at the cab's serious vibration problem of the domestic forklift, the paper carry on static and dynamic analysis of forklift's key components by using the finite element analysis software ANSYS. We find out the key factors of the cab's violent vibration and provide a scientific basis for the forklift's structure optimization and improvement. We get the maximum stress and maximum deformation of the frame structure through the static analysis, which determine the static strength of the original frame structure. The natural frequencies and vibratin modes of the overhead guard are obtained by modal analysis, and we find out the causes of the cab violent vibration through contrast analysis. The hood's contrast analysis of model shows that it will incur resonance phenomenon under the engine incentives, and we put forward two improvement measures that large flat section wrinkling and internal spot-lined plate combining the test experiment. Moreover, the frame is easy to induce resonance in idle speed and the highest speed according to the modal analysis, and the front and rear frame appear large deformations. The stiffness needs to be improved. The weak parts of frame can be found by the sensitivity analysis in order to take targeted improvement measures. We get the optimum thickness of the frame through multi-objective optimization analysis, and the first-order natural frequency and operating frequency are increased by 14.25% and 24.69% after improvement. By improving the frame suspension beam of the structural support, we can effective avoid the resonance at the maximum engine speed incentives. The main research results of this paper is to verify the key causes of the cab violent vibration through a combination of simulation research and experimental tests, and find out the weak links of the forklift structure by using sensitivity analysis. It proposes pertinent optimization and improvement, which greatly enhance the stability. The cab vibration analysis and research method can provide guidance for the future related products in improvement work.