Papers by Keyword: Boom System

Abstract: Facing the energy crisis and environmental problems, saving energy of construction machinery, especially in the hydraulic excavator is very important. Regeneration of the potential energy is an effective solution to save energy. However, the conventional hybrid excavator can’t regenerate the potential energy. This paper proposes a new structure of boom system of hydraulic excavator as well as a control strategy. The focus of the paper is using hydraulic transformer to regenerate energy and reusing the regenerated energy. The simulation is carried out by the AMESim software. From the simulation results, this new system has a high efficiency for energy saving.

Abstract: Concrete pump truck plays an important role in national economic development and infrastructure construction. The boom system is one of the most critical parts of concrete pump truck, so it is important to analysis the strength. In this paper, the research is on the concrete pump truck of 37 meters. The three-dimensional model is established in PRO/E. Then the model is imported to MSC.PATRAN / NASTRAN and the strength is analyzed. The results show that the maximum stress on the boom is far less than the yield limit of the material, the structure meet the strength requirements.

Abstract: According to mechanical characteristics of space truss structure, the dynamic characteristics of boom system of crawler crane in derricking condition are simulated based on positional FEM. FEM simplified analytical method is established basing on engineering algorithm, only a few units and small amount of calculation are needed when using variable cross-section beam to simulate boom integral structure. The dynamic response time curves of boom system in derricking conditions are obtained, and compared with the existing literature. This further confirms the simplified model is feasible in theory and easy to realize in engineering, it also shows that positional FEM is feasible in dynamic analysis of complex structure.

Abstract: This In this paper, we study the boom of truck-mounted concrete pump, we determine that the four booms extending horizontally is the most dangerous working conditions. This paper bases on Pump arm boom functional and structural characteristics, strength, stiffness, stability. By Finite element method, the dynamic characteristics of arm pump is analysed. we use Solid Works to design three-dimensional entity. and, in the finite element analysis of Solid Works plug-in Cosmos Work environment we finish the theoretical modal analysis. We get its top ten natural frequencies and mode shapes, and analyze the results .This method is designed for high effect and quality Pump arm boom ,providing precise reliable data.

Abstract: The motion equation of boom system of pump truck carrying concrete flow is set up based on the coupled vibration theory of cantilevered pipe and the finite element theory. Dynamic stress history of boom system with parameters of dip angle α=0°is simulated combining MATLAB simulation analyses with ANSYS finite element model. The feasibility of this method is verified through field experiment. Stress histories are simulated by adjusting parameter of dip angle as follows: α=20°,52°and 80°.Great stress points are painted on the Goodman Fatigue Limit Diagram measured by experiment. And then fatigue strength assessment of boom system is done. The research method can be used for the design calculation of similar products.

Abstract: This paper is based on the design of the boom system of concrete pump car.fatigue strength of the boom system is analysed detailedly after completing a series of work, such as the boom system simulation, static strength , the stability analysis and structural optimization. Analysis shows that the easiest damaged location of the boom system is in the joint of the third boom, that is the place of the maximum stress in static analysis of the boom system.The safety coefficient is 1.393 after finishing fatigue analysis,and the numerical value is still bigger than specified safety coefficient, namely 1.3;the minimum life total amount (cycle) is 323500, which occurs in the third quarter boom, that is the place of the maximum stress in static strength analysis of the boom system; the fatigue strength of the boom system satisfy the requirement.These research work provide reliable reference for the design and improvement of the boom structure.

Abstract: This paper takes the boom of truck-mounted concrete pump from a company as the study subject. After analyzing its working station, it can be found that the fourth boom is in the most dangerous working conditions when extending horizontally. Select this operating mode, carry on the stress analysis and three dimensional entity modeling with the project software Solid Works to it, then realize the boom's statics finite element analysis with Solid Works plug-in unit Cosmos Works.

Abstract: In this paper, we study the boom of truck-mounted concrete pump from a company. After analyzing, we determine that the four booms extending horizontally is the most dangerous working conditions. We use the software Solid Works to design three-dimensional entity. With the help of Cosmos Motion which is a part of Solid Works, realizing the kinematic simulation. This paper study and analyze the problems during the simulation process, and collect a series of curves of kinematic simulation, mainly including the place-time curve, velocity-time curve and force-time curve, and analyze these curves detailedly.

Abstract: In the study, the development of aerial platform truck of 42m boom system has been completed to be satisfied with working in much higher place. To avoid the rollover accident of vehicles while working, 3D FEA is applied to verify the 3D design, stress concentration, stress distribution, deflection, natural frequencies etc. In these analyses, traction load of Boom System, 700 Kg and traction degree analyzed to 0° ~ 85°. Analysis result, when Boom System's angle is 0°, could know that stress concentration and deflection are obtained to maximum. We could predict that maximum point of Stress concentration is 3.275 as safety factor and deflection of Boom system end part is max. 78.5Cm. Also could know that natural frequency and mode shape of boom system are stable in correlation with aerial platform truck's operation area. With these results, the structural stability of boom system in 42m aerial platform truck is obtained, then finally trying to find an optimum design of aerial platform truck.

Abstract: A shape design optimization of the boom system in high ladder vehicle modeled by 3-dimensional finite elements is carried out. The structural analysis is performed using 3-D FEA (Finite Element Analysis) giving the results of displacements, stresses and natural frequencies. The section height and width of the boom is controlled by the FEA result data. The subproblem approximation method is implemented for the optimal shape based on displacement and principal stress. In the meantime, Lanzcos algorithm method is implemented in order to find the natural frequency of the system. The optimal models obtained by three different optimization processes are compared with the initial model and evaluated for economic conditions respectively. It is found that the different shape optimization processes give the different shape optimization results, which suggest their unique optimal shapes under their necessary design condition.