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Drive axle dynamic characteristic computing method considering input torque changing

A bridge dynamics and characteristic calculation technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problem of not considering the influence of the bearing stiffness by the change of the input torque of the drive axle, and unable to reflect the influence of the change of the input torque.

Active Publication Date: 2014-08-20
TSINGHUA UNIV +1
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Problems solved by technology

[0003] Most existing research methods use simplified lumped parameter models when calculating drive axle dynamics, treating system components as lumped masses, and treating bearings as springs, one end of which is connected to the lumped mass point of the shaft, and the other end is grounded. is a constant, and does not consider the influence of the bearing stiffness by the change of the drive axle input torque, so it cannot reflect the influence of the input torque change on the dynamic characteristics of the drive axle system

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  • Drive axle dynamic characteristic computing method considering input torque changing
  • Drive axle dynamic characteristic computing method considering input torque changing
  • Drive axle dynamic characteristic computing method considering input torque changing

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0051] Such as figure 1 As shown, the calculation method of the dynamic characteristics of the drive axle considering the input torque variation provided by the present invention includes the following steps:

[0052] 1) Define the global coordinate system of the driving axle: define the global coordinate system of the driving axle system as the basis of system modeling.

[0053] In this embodiment, the vehicle coordinate system of the car is used as the global coordinate system of the system, that is, the front of the vehicle is the positive direction of the x-axis, the left side is the positive direction of the y-axis, the vertical direction is the positive direction of the z-axis, and the origin of the coordinates is the differential speed the center position of the cross axis.

[0054] 2) Establish the shafting beam element model: the shafting c...

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Abstract

The invention relates to a drive axle dynamic characteristic computing method considering input torque changing. The method comprises the steps that (1) a drive axle global coordinate system is defined; (2) a shafting beam unit model is established; (3) a nonlinear roller bearing model is established; (4) a gear model is established; (5) a connecting part model is established; (6) a shell finite element model and a dimension-reducing model are established; (7) a complete drive axle system dynamics model is established; (8) bearing stiffness under different input torque working conditions is computed; and (9) the drive axle system dynamic characteristics under different input torque working conditions are computed. According to the method, a finite element method and a modality comprehensive method are used for establishing the complete drive axle system dynamics model which comprises a main speed reducing assembly, a differential mechanism assembly, a hub assembly, a shell and the like, and the dynamic characteristics of a drive axle system can be computed accurately and efficiently.

Description

technical field [0001] The invention relates to a method for calculating dynamic characteristics of components in the field of vehicle transmission, in particular to a method for calculating dynamic characteristics of drive axles considering input torque changes. Background technique [0002] The vibration and noise of the drive axle is the main source of vehicle noise, and the transmission error of the bevel gear of the final drive is the root cause of the vibration and noise of the drive axle. The drive axle is a dynamic system composed of shafts, bearings, gears and housings. The transmission error of the gears will generate dynamic excitations, which will be transmitted to the housing through the shaft-bearings, causing vibration and noise problems in the entire system. Establishing an accurate and efficient dynamic model of drive axle system is an effective method to study the dynamic characteristics of drive axle system, which can greatly shorten the research and devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 范子杰周驰丁炜琦田程王琪桂良进
Owner TSINGHUA UNIV
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