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Method for predicting vehicle dynamic behavior using helix theory

A behavioral and dynamic technology, applied in vehicle components, special data processing applications, vehicle steering/bump performance, etc., can solve problems such as difficult optimization of lateral swing behavior

Inactive Publication Date: 2007-05-02
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the vehicle's roll behavior is affected by the relative changes in the front and rear wheel suspensions, so it is very important to optimize the vehicle's roll behavior by estimating the front and rear wheel suspensions separately. difficult

Method used

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  • Method for predicting vehicle dynamic behavior using helix theory
  • Method for predicting vehicle dynamic behavior using helix theory
  • Method for predicting vehicle dynamic behavior using helix theory

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Embodiment Construction

[0040] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0041] Figure 1 shows the theoretical background of the invention: Rigid body motion in three-dimensional space consists of rotational motion and translation. When both movements are produced, the movement can be defined as a helical movement about a reference axis. The method of analyzing the motion of rigid bodies using this spiral motion is usually called the spiral theory. The method according to a preferred embodiment of the present invention makes use of the helix theory.

[0042] The reference axis of helical motion may be referred to as the limited helical axis. As shown in Figure 1, when the rigid body M from the position p 1 move to position p 2 , the axis SA1 is two positions p 1 and p 2 finite helix axis.

[0043] Any motion of a rigid body can be defined as helical axis motion. Considering this phenomenon, as shown ...

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Abstract

Method for predicting dynamic behavior characteristics of a vehicle using screw theory. A vehicle model is developed for a quasi-static analysis. The quasi-static analysis is performed for the vehicle model under a cornering condition in which a specific lateral force acts. A finite screw axis is determined based on a rigid body displacement of the vehicle model with respect to the ground through the quasi-static analysis. A fixed screw axis surface formed by a migration of the finite screw axis is also determined. The gradients of screw parameters with respect to lateral forces when the vehicle model behaves in an initial cornering state are calculated. Roll behavior is then estimated based on the fixed screw axis surface and gradients of screw parameters.

Description

technical field [0001] The invention relates to a method for predicting vehicle dynamic behavior characteristics by applying spiral theory. Background technique [0002] Accurately predicting vehicle motion characteristics is very difficult. However, these characteristics are very important and can affect driver fatigue levels as well as vehicle handling and stability. [0003] Therefore, when developing a new vehicle, the design target of the vehicle's motion characteristics is determined in advance, and the overall geometry of the vehicle is determined to achieve the predetermined design target. [0004] If the motion characteristics of the vehicle are not predicted before vehicle development, various tests will be required, the development cost will increase significantly, and the possibility of design failure will also increase. [0005] Therefore, in the vehicle development process, the adopted suspension system is designed first, and the performance of the suspension...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M17/06B60G17/00B60G17/018B60G21/00G06F17/50
CPCB60G2800/70B60G2206/99B60G2800/87G06F17/5095G06F17/5009B60G2800/912B60G2600/1873B60G2800/012B60G17/0182G06F30/15G06F30/20B60G21/00
Inventor 李彦求
Owner HYUNDAI MOTOR CO LTD