Impact analysis method of forklift truck roof guard based on controllable series deformation accumulation method
An analysis method and the technology of the overhead guard, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of large impact time interval, long calculation time, short calculation time, etc., and achieve reduction and shortening of calculation time Calculation time, effect of good calculation accuracy
Inactive Publication Date: 2019-01-04
ZHEJIANG UNIV
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Problems solved by technology
The parallel deformation superposition method has a short calculation time, but the result error is large; the serial deformation accumulation method requires a large impact time interval, and the calculation time is long
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[0031] A method for analyzing the impact of a forklift roof guard based on the controllable serial deformation accumulation method, comprising the following steps:
[0032] (1) Establish a three-dimensional solid model of the forklift roof guard, and simplify the non-key details of the model;
[0033] (2) According to the ISO 6055:2004 standard, the impact energy W and the impact mass M are determined by the rated lifting capacity, and the impact drop height H is calculated by the following formula:
[0034] H=W / (9.8×M)
[0035] The free-falling process of the impacting object will take a lot of time. To save time, the initial state of the simulation analysis is set as when the impacting object is close to the roof guard, the corresponding initial velocity V is applied to the impacting object. 0 :
[0036]
[0037] Where Δh is the vertical distance between the impact object and the roof guard in the initial state, satisfying Δh>c / 2, and c is the height of the impact objec...
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The invention discloses an impact analysis method of forklift truck roof protection frame based on controllable series deformation accumulation method, includes the following steps: at first, a three-dimensional solid model of that forklift truck roof guard is establish, applying a corresponding initial velocity to the impactor, establishment of finite element analysis model, Take appropriate celltypes, Size mesh, Check grid quality, Contact algorithm setting and hourglass control, The intermittent dynamic analysis is carried out by setting the loading interval between the impact loads. The element is continuously adjusted until it meets the requirements, the convergence is checked, the energy conservation is checked, the displacement curves and time curves of the measuring points are extracted, and the impact calculation of the forklift truck roof guard frame based on the controllable series deformation accumulation method is completed. The controllable string type deformation accumulation method of the invention not only ensures good calculation accuracy, but also greatly reduces calculation time, and is suitable for impact analysis and calculation of forklift truck roof protection frame.
Description
technical field [0001] The invention relates to an impact analysis method of a forklift roof guard based on a controllable serial deformation accumulation method. Background technique [0002] The forklift roof guard can reduce or avoid the threat of accidentally falling goods to the driver, and plays an important role in protecting the forklift driver. The main structure of the forklift roof guard is composed of front outriggers, front beams, rear outriggers, middle beams, rod parts and other parts, and belongs to the space steel frame structure. The international standard ISO 6055:2004 "Technical Requirements and Test Methods for Roof Guards for Industrial Vehicles" clearly stipulates the methods and requirements for the safety test of roof guards. Regulation. The safety performance test of forklift roof guard is a destructive test, and its repeatability is difficult and the cost is high. Therefore, it is very necessary to use the method of simulation analysis to study ...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 童水光赵航童哲铭从飞云唐宁余跃刘会琴
Owner ZHEJIANG UNIV