A forklift truck is one of the most important tools in ports, stations, factories, and warehouses. The steering wheel of such a truck is the main contact part between the driver and the truck, and the vibration intensity of this part directly determines the operating comfort of the driver. This paper mainly aims to analyze and optimize steering wheel idle vibration. Experiments are implemented on a group of faulty forklifts to investigate the performance trends and the root causes of the vibration problem. The Hilbert-Huang transform method is used to analyze steering wheel vibration features of faulty forklift trucks at idle. Along with simulation, we learn that resonance vibrations is the main reason that causes the excessive vibration at idle. Thus, we propose an optimization scheme that separates the support plate (referred as part A) from the brake pedal mounting plate (referred as part B) and increases the thickness of the front plate to restrain idle vibration. The results obtained from simulation and comparative experiments indicate that the proposed schemes can effectively suppress the idle vibration of the steering system.
The thin liquid film entrained by a continuous immersed solid pulled through a tank is of the main interest in many industrial processes. In order to appraise the state of art, it has been reviewed the experimental and theoretical studies of a solid being withdrawn horizontally from a tank. This review has revealed that the open literature is scarce. The main objective of this paper is to study the above stated problem. To this end, it has been performed a series of experiences of horizontal withdrawal of wires from a tank of water, and an approximate theoretical model has been developed.