Shape optimizing method for cylinder sleeve of slow-speed diesel

A technology for cylinder liners and diesel engines, applied to cylinders, cylinder heads, mechanical equipment, etc., can solve the problems that the design concept is difficult to fully realize, and achieve the effects of reducing weight, saving casting costs, and saving materials

Active Publication Date: 2012-12-12
HUDONG HEAVY MACHINERY
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Problems solved by technology

[0005] Through technical retrieval, it is found that the geometric shape of the existing cylinder liner structure design is relatively simple. On the one hand, it is related to the early design ideas and design methods; on the other hand, it is not completely designed according to the structural strength and stiffness requirements. The limitations of the manufacturing process level at that time made it difficult to fully realize some design concepts

Method used

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  • Shape optimizing method for cylinder sleeve of slow-speed diesel
  • Shape optimizing method for cylinder sleeve of slow-speed diesel
  • Shape optimizing method for cylinder sleeve of slow-speed diesel

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Embodiment 1

[0066] According to the above optimization design process, the cylinder liner of a certain type of high-power diesel engine is optimally designed. In this embodiment, the initial wall thickness of the cylinder liner is 72 mm, and the cylinder liner at the lower end mainly plays a guiding role and is also impacted by the piston. The strength requirement of this part is not high, so this part is optimized .

[0067] Firstly, the finite element parametric model of the cylinder liner is established, and the kinematic calculation and analysis are carried out to obtain the impact force on the cylinder liner, and then the simulation analysis of the impact response is carried out. Under the impact of the piston, the maximum VON Mises stress of the original structure is calculated to be 149MPa, and the maximum deformation is 2.2mm; after reducing the wall thickness of the cylinder liner by 22mm, the impact response analysis is carried out, and the maximum VON Mises stress of the optimi...

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Abstract

The invention relates to a shape optimizing method for cylinder sleeve of slow-speed diesel, comprising the following steps: firstly, establishing a CAD three-dimensional parametrization model of a cylinder body so as to form a parametrization data model for carrying out the finite element simulation analysis; secondly, carrying out the structure kinematic analysis on a cylinder sleeve subassembly of a piston, and determining the lateral impact applied on the cylinder sleeve by the piston; thirdly, parametrizing the key size of the cylinder sleeve, carrying out the finite element analysis on the cylinder sleeve structure, and carrying out the structure optimization design on the wall thickness of the cylinder sleeve; finally, carrying out the analysis verification on the model after beingoptimized so as to obtain the CAE data result and form a final cylinder sleeve optimization simulation design flow and a model database file. The original design is modified by using the method of the invention so that a more reasonable geometrical shape of the cylinder sleeve is obtained, thereby effectively reducing the weight of the cylinder sleeve and saving the material and casting cost.

Description

technical field [0001] The invention belongs to the field of mechanical design, and relates to the structural shape optimization design of a cylinder liner, in particular to a shape optimization design method for a high-power marine low-speed diesel engine cylinder liner. Background technique [0002] The cylinder sleeve is embedded in the cylinder body, together with the cylinder head and the piston group, it constitutes the working cycle space of the diesel engine. Its shape is a cylinder with unequal wall thickness that is affected by internal pressure and temperature stress. The structure of the cylinder liner is as figure 2 as shown, figure 2 It is a structural schematic diagram of the original cylinder liner in the method for optimizing the shape of the low-speed diesel engine cylinder liner according to the present invention. During the working process of the diesel engine, the inner surface of the cylinder liner is directly subjected to the repeated impact of high-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50F02F1/00
Inventor 刘利军宋雅丽董晶瑾
Owner HUDONG HEAVY MACHINERY
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