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Method for predicting fatigue life of straw throwing impeller

A technology of fatigue life prediction and fatigue life, which is applied in the field of impeller fatigue life prediction and straw throwing impeller fatigue life prediction, can solve the problems of complex interaction and difficulty in obtaining load information of throwing impeller, and achieve reasonable design, The effect of improving accuracy

Active Publication Date: 2018-11-16
INNER MONGOLIA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0003] At present, the design and research of the blade-type straw throwing device at home and abroad pay more attention to its performance indicators such as power consumption, throwing efficiency, and throwing distance. The interaction between the delivery shells is very complicated, and it is difficult to obtain the load information on the delivery impeller by means of theoretical analysis and test methods. Therefore, most of the fatigue problems of the delivery delivery impeller are qualitative analysis at present.

Method used

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  • Method for predicting fatigue life of straw throwing impeller
  • Method for predicting fatigue life of straw throwing impeller
  • Method for predicting fatigue life of straw throwing impeller

Examples

Experimental program
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Embodiment

[0110] Such as figure 1 As shown, the blade-type throwing impeller device is mainly composed of a throwing impeller 1 , a throwing shell 2 and a discharge pipe 3 .

[0111] The known design conditions are: the outer diameter of the impeller of the blade throwing device is Φ500mm, the width of the blade is 140mm, the thickness of the blade is 5mm, the number of blades is 4, the inclination of the blades is radial blades, and the speed of the impeller is 1500r / min; Crushed yellow corn stalks, crushed length 4-12mm, average diameter Φ2-6mm, average density 9.21×10 -8 kg / mm 3 . The feeding amount is 0.8kg / s.

[0112] 1) The finite element model of the throwing impeller is established and meshed, in which the number of mesh elements is 26800 and the number of nodes is 40532.

[0113] The flow channel model of the vane throwing device is established in Fluent, and the calculation area is meshed, and the number of meshes is 687 533. The large eddy simulation turbulence model is ...

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Abstract

The invention discloses a method for predicting the fatigue life of a straw throwing impeller. The method comprises: fluid-solid coupling and throwing impeller stress analysis; a two-parameter nominalstress model; a two-parameter nominal stress model of the throwing impeller; and a Mine fatigue accumulation damage model. The method disclosed by the invention has the benefits that: the method forpredicting the fatigue life of the throwing impeller that the two-parameter (the average stress Sa Sm and the stress amplitude Sa) nominal stress model, the Miner fatigue accumulation damage model anda fatigue life logarithmic normal distribution model are combined is adopted; simultaneously, to accurately obtain the random cycle load of the throwing impeller, the stress thereof is calculated andanalyzed by adoption of a fluid-solid coupling method; and thus, on this basis, prediction of the fatigue life of the throwing impeller is carried out.

Description

technical field [0001] The invention relates to a method for predicting the fatigue life of an impeller, in particular to a method for predicting the fatigue life of a straw throwing impeller, which belongs to the intersection field of agricultural fiber material harvesting and processing machinery design and computer-aided analysis. Background technique [0002] The blade-type straw throwing device mainly throws materials through the combined action of the centrifugal force generated by the high-speed rotating throwing impeller and the airflow. As the core component, the throwing impeller is mainly affected by random cyclic loads such as centrifugal force, gravity, and multiple coupled flow field forces of the impeller-airflow-material-shell. Practice has shown that the fatigue fracture of the impeller is the main cause of its failure, which directly affects the entire system. Safety and performance of blade straw throwing device. [0003] At present, the design and resear...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 翟之平梁洪瑜程海鹰
Owner INNER MONGOLIA UNIV OF TECH
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