The popularity of aerial work platforms is rapidly increasing in the mechanization industry. As a result, the safety and structural strength of aerial work platforms should be prioritized.In this ...study, the mathematical model of a reconstructed aerial work platform was developed and a 3D model was created using the Solidworks software. A dynamic analysis was then performed to improve various structural parameters of the aerial work platform. The analysis was carried out using solid modelling, finite elements, and dynamic transient analysis. In compliance with international structural standards, the weight distribution was reconstructed after placing a mass behind the turret.The results of the dynamic transient analysis were compared with the mathematical model and validated. Then, the effect of the mass placed behind the turret on the machine was examined. The lateral tipping distance of the static work platform was found to have increased from 15.9m to 17.08 m. The structure of the aerial work platform was improved using a structural and dynamic analysis approach. It was also discovered that the machine efficiency could be further increased by ensuring that the balancing weight is moved further away from the tower centre by a hydraulic-based system and controller.
In this paper, a model of aerial work platform working device based on virtual prototype and finite element method was established. Through the software ADAMS kinematic simulation, we got the moving ...velocity and acceleration. The moving velocity and acceleration showed that the aerial work platform working device met the standards of the national safety standard. Through the dynamics simulation, we got the joints force between working device, we input the joints force into the finite element model established by the software of Hyperworks. The simulation result of working device stress distribution showed that the chose material met the working requirements; the structural design of working device was reasonable.
The force of a lifting cylinder is the main factor of the alternating stress of scissors arms in a scissors aerial work platform, which seriously affects the fatigue life of structures. Aiming at ...this problem, the installation position parameters that affect the force of the lifting cylinder was simulated and optimised. First, the mechanical model of the lifting system was established based on the principle of virtual work, and the position parameters that affect the force of lifting cylinder were determined. Then, the advanced modeling environment for performing simulation of engineering systems (AMESim) simulation model was used to simulate the lifting process of the lifting system, and the reliability of the simulation model was verified by the pressure test of the hydraulic system. Finally, based on the simulation model, the design of experiment method was used to optimise the installation position of the lifting cylinder in the design and development environment of AMESim, and the optimisation effect was verified through the test on a real vehicle. The result shows that the peak load of the lifting cylinder is reduced by ∼12%, and the average of the steady-state value decreases by ∼20% after the installation position is optimised.
The demand for high aerial work platforms has increased gradually. A safe and lightweight structure is necessary to cut short increasing costs of existing materials. To serve the purpose a base frame ...structure made of concrete and steel is developed for such a platform. However, it was difficult to replicate field conditions when testing the durability and safety of structure. In this study, the failure analysis of the base frame in the field operating condition for the reappearance and accelerated life test was performed. Also, the equations describing the characteristics of the aerial work platform for force and moment due to the weight and the wind at the top of the equipment were introduced and proved. Failure reappearance mechanism using the moment bar was applied for the force and moment simultaneously to the lower frame which reproduced the failure modes with the real size frame. Also, accelerated life test time was induced by using no failure life test time, the shape parameter, and acceleration factor which should be considered with the field operating conditions. The performance test was conducted after attaching the strain gauges at the weak points of the lower frame to prove the effectiveness of the moment bar. The strain values taken from the finite element analysis had the consistent results with the experimental data. It means that the moment bar can be applied to the other aerial work platforms.
Aerial work platform is a special vehicle for carrying personnel to the appointed site in the air for operations. Therefore, the work platform requires high stability. This article proposes a sliding ...mode controller based on neural network for tracking control of folding-boom aerial work platform. Since the chattering caused by sliding mode controller with high-speed switching control may lead to system performance degradation, continuous control obtained from neural network system replaces discontinuous switching control to eliminate chattering. Furthermore, the whole system is proved to be stable by Lyapunov stability theorem. Finally, numerical results show that the designed controller can eliminate the chattering resulting from switching control in sliding mode controller and inhibit the vibration of work platform when there exists system uncertainty. Moreover, the controller is effective for the reduction of tracking error.
Aiming at electro-hydraulic proportional leveling system of large aerial work platform, the model of the system is established and the stability is validated. Because the parameters of traditional ...PID can be used one state only, the leveling performance of large aerial work platform changes with the change of radius-changing velocity. Fuzzy logic is used to PID control, whose parameters can be adjusted automatically according to error and error changing. A comparison analysis between PID and Fuzzy PID is carried with the help of AMESim/Simulink. The simulation results show that the fuzzy PID has better effects and robustness.
The scissors aerial work platform is a high-altitude working machine that transports workers, tools and materials to the target position for operation. In Scissors lift mechanism of scissors aerial ...work platform, double hydraulic cylinders are usually adopted to drive platform. This paper introduces the composition and the working principle of dual cylinder hydraulic drive system, aiming at the synchronous error problems existing in the lift process, hydraulic drive system was researched. An equivalent synchronous control strategy based on fuzzy PID control was present, the fuzzy rules were used to realize the real-time adjustment of PID control parameters. AMESim/Simu-link co-simulation was carried out with hydraulic cylinder piston rod displacement as index. The results show that this strategy can maintain the synchronous accuracy of the double hydraulic cylinders between 0~0.66mm under the condition of satisfying the working requirements of the scissors lift mechanism, to meet the control requirement.
A discussion follows that describes the conceptual design of a human–robot cooperative system, which is proposed to construct glazed ceiling panels. First, considering the environment where the ...system is used, the required specification about the target building that is to be heavy glazed ceiling panels should be constructed. Then, the existing construction equipment and construction process for installing heavy glazed ceiling panels are analyzed. According to analysis of the target work and building, the functional requirements for implementing a glazed ceiling panel construction robot are deduced. Last, a conceptual design was produced for the proposed robot.
The steering system is an important part of pure electric scissors aerial work platform, the original steering system comprises of steering switch, power unit, flow priority valve and other main ...components. Flow controls through the flow priority valve, it's not only the high cost but also inefficient. After optimization of the steering system, the steering system turns to close-loop. The steering with automatic reset, steering position can be precisely controlled and other functions, it is more flexible through the narrow area, low-cost and high-efficiency.
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