Fifth, the structural strength analysis of the pump
The water pump is a typical rotary power machine, which always works under the harmonic load of high-speed rotation. Therefore, it is necessary to analyze the natural frequency, mode and vibration mode of the pump, analyze the stress and strain of the pump under the harmonic load, and the structure Optimize the design. By changing the design parameters, the quality is minimized on the basis of satisfying the stress, strain and modal frequency. COSMOSWorks is a finite element analysis tool for pump designers. It is embedded in the SolidWorks environment and can be analyzed with COSMOSWorks.
1. Structural strength analysis of water pump
Whether it is the blade of the pump, the shaft or the structural shell of the pump body, it is necessary to ensure that the structural strength does not break during the operation. If the strength of the structure is determined by test means, a large number of tests are required to ensure the structure. Reduce the weight of the component if it is qualified.
Using finite element analysis software, it is possible to perform component strength, vibration mode, buckling, dynamic response, structural parameters and topology optimization. On the one hand, it can test the structural strength problems existing in the current design. On the other hand, it can be obtained through analysis. Where the current structure still has a large margin, providing a basis for structural weight reduction, thereby reducing product costs.
2. Fatigue life analysis of typical parts
Another common failure mode of the pump component is the fatigue failure caused by the component subjected to the alternating load. According to statistics, more than 80% of the mechanical parts are fatigue fracture, so the fatigue strength design should be carried out for the parts subjected to the cyclic load. The capital, equipment, and time required to improve the fatigue life of a product through fatigue testing are quite long, so using fatigue analysis software for analysis during the design phase can greatly improve our efficiency in fatigue strength design.
The fatigue analysis software can perform product stress-based, strain-based life assessment, crack propagation analysis, power density spectrum fatigue life analysis, multi-axis fatigue life analysis, and fatigue life analysis of spot welding and welding based on the calculation results of structural analysis software to further improve the product. Ability to resist fatigue damage.
3. Structural dynamics analysis
Vibration is a factor that must be considered in the design of large pumps. COSMOSWorks can be used to investigate the vibration characteristics of pumps and the stress and strain under dynamic loads. The structural optimization design reduces the vibration of the pump and improves the dynamic performance. Dynamic analysis includes: modal analysis, including natural mode, pre-stress mode, cyclic mode, transient analysis, harmonic response analysis and response spectrum analysis. The most basic and important analysis is to solve the natural frequency of the system and the corresponding vibration mode, which provides the basis for the choice of the motor.
4. Coupling analysis
The usual analysis process is to calculate the load on the impeller surface and the driving torque of the pump in COSMOSFloWorks. In COSMOSWorks, these data can be directly read as the load of the part for structural finite element analysis. For the impeller, the load is mainly the water pressure on the flow surface; for the main shaft, the load is mainly the driving torque and the axial pulling force that drive the impeller rotation.
Conclusion
SolidWorks-based pump design, simulation and manufacturing platform can be used for error-free design and manufacturing. By applying COSMOS software and gradually adopting virtual prototyping technology in product design, the development method will be completely changed, thus reducing the physical prototype. Manufacturing and testing, to achieve the purpose of shortening the development cycle, reducing development costs, and speeding up product replacement. The 3D animation of products made with SolidWorks can show great competitive advantages in the bidding process. At the same time, in the after-sales service, it can guide the on-site installation, and in the outsourcing processing, the design intent can be expressed more clearly. SolidWorks will become the blood of enterprise information construction, and every department can benefit from it.
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