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APM Bear

Rolling contact bearings are the main type of supporting units for rotating parts of machines, instruments, apparatuses, various mechanical devices and systems. APM Bear performs a complex analysis of rolling contact bearings. When using it you can calculate main bearing characteristics and select the optimal constructions of the bearing units.

Highly effective method of the non-ideal bearings calculation.

APM Bear is a state of the art software for the calculation of non-ideal bearing parameters.
A bearing is considered non-ideal if its manufacturing errors cannot be ignored in the context of the problem to be solved. Many important problems of the contact stiffness and strength require a bearing to be considered non-ideal. The Center APM has developed the universal method for solving contact problems. Reliability and effectiveness of this method are proved by series of the experimental researches.
The most important bearings parameters are calculated.
Our software helps to design rolling-contact bearing optimum by stiffness and other criteria.

Types of bearings calculated by means of APM Bear

The most widely used types of bearings can be calculated with the help of the APM Bear:

  • radial ball bearing;
  • selfaligning ball bearing;
  • radial-thrust ball bearing;
  • thrust ball bearing;
  • radial roller bearing;
  • selfaligning roller bearing;
  • radial-thrust roller bearing;
  • thrust roller bearing.

We can also add to this list any special type of the bearing you need.

Bearing behavior modeling instead of the single parameter’s calculation

When speaking about modeling we mean that with the APM Bear you are not restricted to the determination of the averaged (or the most probable) parameters values, but rather you are given a possibility to model the behavior of your bearing. To give you such a possibility a reasonably large series of the parameters values are calculated. They show how these parameters are changing. By using these data you can determine the features of distribution, maximum deviations, fields of dispersion, etc. Together with the macro characteristics you are given a look into microcosm of your bearing.

Main features

With the help of the APM Bear you can calculate:

  • displacements (stiffness)
  • maximum contact stress
  • forces acting on the rolling bodies
  • longevity
  • loss of power
  • moment of friction
  • heat release

 Initial data entering

User interface is straightforward and intuitively clear. In order to learn how to work with the APM Bear you need no more than 1—2 sessions. You can enter all geometry data manually or select from mechanical database that is a part of APM WinMachine system. Accuracy parameters can be selected from the database according to accuracy class by request.
You can set variable external loads by means of corresponding graphical editor.
Calculations in the APM Bear can be made for any combination of axial and radial forces, the axial and radial preload allowed for the bearing of the given type.

Window for entering working conditions of bearing

Displacements and stiffness — a keystone in the bearing calculation

Determination of the displacements and stiffness is the keystone and at the same time the stumbling-block of the bearing parameters calculation.

Forces acting on the rolling bodies

During the rotation of the bearing its rolling bodies are subject to the normal forces actions applied from the raceways and depending on the geometry, accuracy, external load, etc.
Existing methods overidealize the problem that produces oversimplified solution. A new approach was developed. It gives a more real picture.
The forces acting on the rolling bodies are calculated in the APM Bear for the each member of the large series of the bearing center positions determined during the bearing displacements calculation. As a result you are given a possibility to trace how these forces change in time.

Safety parameters — longevity and maximum contact stress

The maximum contact stress calculated in the APM Bear is the stress in the contact of the most loaded rolling body. You can test whether it satisfies the required strength condition.
The longevity is the time period during which 90 of each 100 bearings will not have a fatigue failure.

Energetical parameters — friction in the bearing

With the help of APM Bear you can determine three parameters characterizing the action of the frictional forces:

  • moment of friction;
  • loss of power;
  • heat release.

Distribution of rolling bodies loads makes a significant influence on bearing longivity. Longivity calculation comes to determination of bearing working time till spalling start of race.
Accuracy class is an important parameter characterizing bearing work and is directly connected with shaft displacements. These displacements can have in general case axial, radial and sided components depending on bearing type.
For statistical dispersion analysis of output bearing parameters their calculation is performed in 100 arbitrary positions of bearing center. The results of loads calculation let to define energy characteristics: efficiency, loss of power by friction, heat release, etc.

Result representation

The results can be presented as:

  • tables of static characteristics
  • histograms
  • graphs of parameters depending on rotation angle
  • 3D field of bearing center position
  • animation of bearing movement

All this forms of presentation give authentic view about bearing’s movement. You can turn the frictionless bearing in order to watch changing applied bearing loads.

Dialog box Results

Beatings of center of bearing 3D distribution

Axial beatings(axial runout) histogram

Loss of power table

Forces acting on the rolling bodies

Animation of bearings work