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Dynamic Foundation Design
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The scope of this calculation module is to perform dynamic analysis of machine foundation for the given dynamic and non-dynamic loads. Resonance, velocity and amplitude checks are carried out based on the machine data. Eccentricity and mass ratio are calculated for the machine and foundation geometry. In addition, Bearing pressure and stability checks are performed for various load combinations.
Features
- Analysis methods such as Richard & Lysmer (Elastic Half Space Theory) and Barkan’s method (Linear Elastic Spring Theory) are available.
- Multiple base blocks with different thicknesses can be modelled.
- Unlimited number of Base Blocks and Pedestals.
- Pockets can be created with different pedestals.
- Graphical mode option is available for the intelligent modelling of base block and pedestal.
- Clash check, orphan element identification, 3D view, rotate options are also available.
- Foundation properties can be calculated for any geometries ranging from simple to complicated including regular rectangular and Irregular like stepped, L-shaped, pocketed, etc., foundations.
- Module can handle more than one machine and more than one speed in one foundation itself.
- Variable and constant speed machine foundations can be analysed.
- Machine components, load positions can be seen dynamically while modelling.
- Facility to add machine component to foundation mass.
- Dynamic cyclic loading can be simulated using phase angle inputs.
- In-phase and out of phase conditions are checked automatically.
- Time history analysis is carried out based on the damped system to calculate the amplitudes and velocities.
- Coupled and uncoupled frequencies for various modes can be obtained.
- User can select Resonance modes.
- Amplitudes and velocities can be obtained at user defined locations.
- Auto-Detect option is available to find the maximum amplitude/velocity.
- Time history charts are drawn for amplitudes and velocities against every Time steps.
- Static analysis option is available for machines with no dynamic (Unbalanced) loads.
- User can specify the allowable stability factors, and increase or decrease the allowable safe bearing capacity (SBC) for each combination.
- Loads and load combinations can be easily imported from microsoft excel through clipboard facility.
- Comprehensive design report and summary results. A step by step design calculation report eliminates any requirements for additional validation.
Design Considerations
- Self-weight of soil, base block, and pedestals are considered by program. Dead load factor is used as self-weight factor.
- Static checks such as eccentricity, mass ratio, SBC, overturning and sliding checks are carried out for machines with no dynamic (unbalanced) loads.
- Module auto generates all the possible load groups considering In-phase and out of phase conditions when there are more than one rotating for machine.
- Time history analysis is performed for all the auto generated load groups and amplitudes/velocities are calculated accordingly.
- Resonance checks are carried out for each machine speed and compared with its allowable resonance limits. Similarly, amplitudes and velocities are checked with their permissible limits.
- Auto detect amplitude - Module provides the maximum amplitude and velocity of the machine foundation.
- Dynamic load groups are auto generated for orthogonal phases (0°, 90°, 180°, and 270°) with the combinations of one or more rotating machines to take care of dynamic forces/moments in other directions which are considered in the static analysis.
References
- Handbook of Machine foundations by P.Srinivasalu, C.V.Vaidyanathan.
- Design of Strucutres and Foundations for Vibrating Machines by Suresh Arya, Michael O'Neill, George Pincus.
Revision
- Ver 1.0 - Original version
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User Manual
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Download Sample Report |