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Braking Performance Simulation Method and Device for Hydraulic Retarder

A hydraulic retarder and performance technology, which is applied in the field of hydraulic retarder braking performance simulation, can solve problems such as errors, imperfections, and non-convergence of calculation, so as to save workload, reduce dependence, and reduce calculation. amount of effect

Active Publication Date: 2019-08-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some imperfect assumptions in the numerical simulation method based on Euler grids, including many ideal conditions, which lead to non-convergence or large errors in calculations, and cannot meet the requirements for authenticity in future simulations in virtual reality environments. and real-time requirements

Method used

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  • Braking Performance Simulation Method and Device for Hydraulic Retarder
  • Braking Performance Simulation Method and Device for Hydraulic Retarder
  • Braking Performance Simulation Method and Device for Hydraulic Retarder

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Experimental program
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Effect test

Embodiment 1

[0062] This embodiment provides a hydraulic retarder braking performance simulation method, such as figure 1 shown, including the following steps:

[0063] In step S101, a geometric model is established for the selected hydraulic retarder; the geometric model includes a fixed wheel model area, a moving wheel model area and a full channel model area.

[0064] Taking a double-cycle circular hydraulic retarder as an example, it is mainly composed of two fixed wheels and a moving wheel. The number of blades of the fixed wheel is 51, the number of blades of the moving wheel is 47, and the diameter of the circular circle of the impeller is 355mm. According to the structure of the hydraulic retarder, a three-dimensional geometric model is established. There is one oil inlet and two oil outlets distributed in the area of ​​the full channel model, that is, one oil inlet (fluid-filled branch) and two oil outlets ( circulation heat dissipation branch and liquid filling regulation branch...

Embodiment 2

[0108] Such as figure 2 As shown, the hydraulic retarder braking performance simulation method provided in this embodiment includes the following steps:

[0109] Step S201, establishing a geometric model for the selected hydraulic retarder; the geometric model includes a fixed wheel model area, a moving wheel model area and a full flow channel model area;

[0110] Step S202, simplifying the geometric model, constructing the full-runner model area as a closed full-runner wheel cavity model area;

[0111] Step S203, dividing each region of the geometric model into grid units according to different attributes of each region;

[0112] Step S204, in the area of ​​the full-channel wheel cavity model, convert the volume grid unit nodes into fluid particles to simulate fluid motion;

[0113] Step S205, according to the preset smooth length of the fluid particles, the oil flow model is constructed in the full channel wheel cavity model area through the smooth kernel function;

[01...

Embodiment 3

[0131] This embodiment discloses a hydraulic retarder braking performance simulation device, such as Figure 7 As shown, the device includes:

[0132] The geometric model building module 71 is used to establish a geometric model for the selected hydraulic retarder; the geometric model includes a fixed wheel model area, a moving wheel model area and a full runner model area; the geometric model is simplified, and the entire The runner model area is constructed as a closed full runner wheel cavity model area;

[0133] A grid division module 72, configured to divide each area of ​​the geometric model into grid units according to different attributes of each area;

[0134] The particle generation module 73 is used to convert the body mesh unit nodes into fluid particles in the full channel wheel cavity model area to simulate fluid motion;

[0135] The simulation model construction module 74 is used to construct an oil flow model in the area of ​​the full channel wheel cavity mod...

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Abstract

The invention provides a simulation method and device for braking performance of a hydraulic retarder, and belongs to the technical field of performance prediction of hydraulic retarders. The simulation method and the device for the braking performance of the hydraulic retarder provided by the invention use fluid particles generated in a grid node to replace a grid cell in a whole flow passage wheel cavity model to simulate fluid motion, and use a rigid grid cell to describe in a fixed wheel model area and a driving wheel mode area. Through the interaction between the fluid particles and the grid cell, the working condition of the hydraulic retarder can be simulated truly, a relatively accurate steady braking torque value can be obtained, and meanwhile the dynamic braking performance can be predicted. Through the fluid particles and the grid cell, fluids and solids have been clearly distinguished, and a clear contact surface is not required to be divided and contacted components are only needed to be defined, so that the dependence on the grid quality is reduced, and a key contact surface grid is not needed to be refined, therefore, the amount of calculation is reduced and the workload of pre-processing is saved.

Description

technical field [0001] The invention relates to the technical field of hydraulic retarder performance prediction, in particular to a hydraulic retarder braking performance simulation method and device. Background technique [0002] In order to adapt to the trend of modern vehicles developing toward high speed and heavy load, hydraulic retarder, as an important auxiliary braking device, is more and more used in vehicle braking systems. The main performance parameters of hydraulic retarder are braking torque, effective time and so on. [0003] At present, the performance simulation analysis of hydraulic retarders is mostly based on CFD (Eulerian grid) numerical simulation technology, the basic idea is to replace the continuous physical quantity field in the time and space domain with the variable value on the finite discrete point. Set, based on certain assumptions, by establishing the relationship equations of these discrete point variables, the approximate value of the fiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17G06F30/20
Inventor 姚寿文王东王瑀林博
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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