CN105354395B - A kind of ball bearing vibration equivalence modeling method based on ADAMS - Google Patents

Abstract

The invention discloses a ball bearing dynamics equivalent modeling method based on ADAMS, comprising the following steps: 1) establishing a three-dimensional stereogram of the ball bearing, and importing the three-dimensional model into ADAMS; Connecting rods, add a slip pair between each ball center of mass and the connecting rod, and then use Boolean operations to synthesize all the connecting rods into a connecting rod member to replace the cage of the original model, modify the quality attribute parameters of the connecting rod member and set it to Zero; 3) A ball with a radius smaller than the ball is built into each ball of the ball bearing, and a ball joint is added to constrain the ball and the built-in ball; the quality attribute parameter of the built-in ball is changed to zero. Under the premise of ensuring correct modeling and not affecting the dynamic simulation results, the present invention accurately simulates the complex rotation of the ball during the actual operation of the bearing; greatly simplifies the modeling steps, greatly reduces the simulation calculation time, and improves the simulation reliability and Simulation efficiency.

Description

A Dynamic Equivalent Modeling Method of Ball Bearing Based on ADAMS

technical field

The invention relates to a dynamic modeling method of a ball bearing, in particular to an ADAMS-based dynamic equivalent modeling method of a ball bearing.

technical background

The bearing mechanics model has gone through three stages of development: static analysis model, quasi-static analysis model and dynamic analysis model. In the early days, the static analysis model was only established based on the ideal motion state and simple motion relationship, so it was difficult to accurately predict and describe the motion state of the bearing. The quasi-static analysis model is relatively complete, and can effectively predict motion parameters such as rolling element speed, bearing fatigue life, bearing deformation and stiffness, and can basically meet engineering needs, but it cannot analyze the transient instability of bearings, nor can it fully describe the dynamic performance of bearings . The dynamic analysis model can not only effectively analyze the working state of the bearing and the stability of the rolling elements and cages when the load and speed of the bearing change with time, but also describe the dynamic and steady-state motion of the bearing more realistically and accurately. Therefore, in recent years, Research on dynamic analysis modeling methods has been paid attention to.

In the process of dynamic analysis of ball bearings, it is very effective to use computer simulation technology to analyze and study bearing dynamics, and the multi-body dynamics simulation software ADAMS has been widely recognized in the field of dynamic analysis. However, in the modeling process based on ADAMS, the mechanical characteristics of the internal components of the ball bearing during operation are very complicated: the ball inside the bearing has both revolution around the bearing axis and rotation around its center of mass axis; The contact between the rolling elements and the inner and outer rings and the cage is a multi-body contact problem. In addition, the contact between the inner ring of the bearing and the shaft, and the contact between the outer ring of the bearing and the housing will affect the internal parts of the bearing. Therefore, rolling bearing is a complex contact problem that integrates multi-body contact, friction, sliding, material nonlinearity, geometric nonlinearity, and boundary nonlinearity. It is of great significance to correctly establish the dynamic simulation model of rolling bearings and accurately simulate the bearing rotation under real conditions.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides an equivalent modeling method based on ADAMS ball bearing dynamics that can accurately simulate the complex rotation of balls in the actual operation of the bearing, and it can also improve the simulation reliability and simulation efficiency of the ball bearing.

The technical scheme adopted in the present invention is: a kind of ball bearing dynamics equivalent modeling method based on ADAMS, comprises the following steps:

1) Create a 3D stereogram of the ball bearing, and import the 3D model of the ball bearing into ADAMS;

2) Establish a connecting rod corresponding to the number of ball bearing balls in ADAMS. The connecting rod is set along the radius of the ball bearing and passes through the center of the corresponding ball; add a slip pair between each ball center of mass and the connecting rod, and then All the connecting rods are synthesized into a connecting rod member to replace the cage of the original model through Boolean operations, and the quality attribute parameters of the connecting rod member are modified and set to zero.

3) A built-in ball with a radius smaller than the ball is built into each ball of the ball bearing, and a ball joint pair is added to constrain the ball and the built-in ball; finally, the quality attribute parameters of the built-in ball are changed to zero.

Compared with prior art, the beneficial effect of the present invention is:

1. On the premise of ensuring correct modeling and not affecting the dynamic simulation results, the present invention can accurately simulate the actual running process of the bearing, the ball not only revolves around the axis but also rotates around its center of mass, and relatively slides with the cage complex rotation.

2. The present invention greatly simplifies the modeling steps, reduces the addition of constraints, greatly reduces the simulation operation time, and improves the simulation reliability and simulation efficiency of the ball bearing.

Description of drawings

Fig. 1 is a schematic diagram of a cage simulation of the present invention.

Fig. 2 is a left side view of Fig. 1 .

Fig. 3 is a ball simulation diagram of the present invention.

Fig. 4 is a left side view of Fig. 3 .

Fig. 5 is an equivalent schematic diagram of the cage of the present invention.

In the figure: 1 Bearing outer ring 2 Connecting rod member 3 Bearing inner ring 4 Ball 5 Slip pair

6 built-in ball 7 ball hinge pair.

detailed description

The present invention will be further described below in conjunction with specific accompanying drawings.

Concrete steps of the present invention are as follows:

Step 1: Create a three-dimensional stereogram of the ball bearing on the three-dimensional software. The ball bearing includes a bearing inner ring 1, a bearing outer ring 3 and balls 4, and import the three-dimensional model of the ball bearing into ADAMS.

Step 2: Create connecting rods corresponding to the number of ball bearings in ADAMS. The connecting rods are set along the radial direction of the ball bearings, and the connecting rods pass through the centroids of the corresponding balls; add slip between the centroids of each ball and the corresponding connecting rods Vice 5, and then use Boolean operations to synthesize all the connecting rods into a connecting rod member 2 (as shown in Figure 5) to replace the original model cage, and modify the quality attribute parameters of the connecting rod member 2, and set its system default quality parameter to Zero; as shown in Figure 1 and 2.

Step 3, build a built-in ball 6 with a radius smaller than the ball in each ball of the ball bearing, and the built-in ball 6 is concentric with the corresponding ball; and add a ball joint 7 to constrain the ball and the built-in ball 6; then modify the quality of the built-in ball 6 Attribute parameters, set the default quality attribute parameters of the system to zero, as shown in Figures 3 and 4.

Claims (1)

1. a kind of ball bearing vibration equivalence modeling method based on ADAMS, comprises the following steps：

1）The 3 dimensional drawing of ball bearing is established, and the threedimensional model of ball bearing is imported in ADAMS, ball bearing includes bearing Inner ring, bearing outer ring and ball；

2）Connecting rod corresponding with ball bearing ball quantity is established in ADAMS, radius of the connecting rod along ball bearing is set, and is passed through The centre of sphere of corresponding ball；Addition sliding is secondary between each ball barycenter and connecting rod, then will be all by Boolean calculation Connecting rod synthesize the retainer that link component substitutes master mould, change the qualitative attribute parameter of link component and set It is zero；

3）In each ball of ball bearing built-in radius be less than ball interior Place, and add typed ball bearing pair constraint ball with it is built-in Ball；Finally, the qualitative attribute parameter of interior Place is revised as zero.