In modern industrial automation control systems, the hydraulic servo system is widely used due to its fast response speed and high control accuracy. The rotating direct drive servo valve, as a key executive element in the hydraulic servo system, has a dynamic performance that directly affects the stability and reliability of the entire system. The sheet metal frame, as the supporting structure of the servo valve, not only bears the function of fixing and protecting the internal components, but its vibration characteristics also have an important impact on the dynamic response of the servo system. Therefore, the vibration analysis of the rotating direct drive servo valve sheet metal frame has significant engineering significance.



The structural characteristics of the sheet metal frame



The sheet metal machine frame of the rotating direct drive servo valve is usually composed of thin plate metal materials through stamping, bending, welding, and other processes, which has the advantages of light weight, low cost, and convenient processing. However, due to its thin and light structure, the stiffness is relatively low, which is easy to be affected by external excitation or vibration caused by the movement of internal components during work, leading to resonance, noise, and even structural fatigue damage and other problems.



Two, Vibration source analysis



The main factors causing the vibration of the sheet metal machine frame during the operation of the servo valve include:



1. Electromagnetic excitation: Alternating magnetic field generated by the servo motor during operation will cause electromagnetic force fluctuations, which in turn will cause structural vibration.



2. Mechanical unbalance: Manufacturing errors or assembly deviations of the rotor components will lead to rotational unbalance, causing periodic vibration.



3. Fluid pulsation: Pressure pulsation produced by the uneven flow of oil in the hydraulic system will also be transmitted to the frame through the valve body.



4. External environmental vibration: Mechanical vibration or ground vibration in the equipment operating environment may be transmitted to the sheet metal machine frame through the base.



Three, Vibration analysis methods

　　In order to accurately evaluate the vibration characteristics of the sheet metal machine frame, the method of combining finite element analysis (FEA) with experimental testing is usually adopted.



1. Finite element modeling and modal analysis



Using simulation software such as ANSYS, ABAQUS, etc., establish a three-dimensional model of the sheet metal machine frame and perform modal analysis to obtain its natural frequency and mode distribution. By identifying the low-order natural frequencies of the structure, it can be determined whether there is a risk of resonance with the external excitation frequency, thus avoiding the occurrence of resonance phenomena.



2. Harmonic response analysis



Under the known excitation frequency, harmonic response analysis can predict the displacement response amplitude of the frame at a specific frequency, and evaluate its dynamic stability.



3. Experimental testing

　　Use acceleration sensors to measure the vibration of the actual operating sheet metal machine frame, and combine with spectral analysis technology to identify the main frequency and vibration source, and verify the effectiveness of the simulation results.



Four, Vibration reduction optimization measures

　　Based on the analysis results, the structural optimization and vibration reduction design of the sheet metal machine frame can be carried out from the following aspects:



1. Structure reinforcement: Increase reinforcing ribs or local thickening at key parts to improve the overall stiffness;



2. Material improvement: Select high damping materials or composite materials to enhance the vibration absorption capacity of the structure;



3. Vibration isolation design: Set vibration isolation pads or elastic supports at the installation base to isolate the transmission of external vibration;



4. Dynamic balance adjustment: Improve the dynamic balance accuracy of rotating parts and reduce internal vibration sources.



Five, Conclusion



With the development of industrial equipment towards high precision and high speed, the vibration problem of the sheet metal machine frame of the rotating direct drive servo valve has received increasing attention. Through scientific vibration analysis and optimization design, not only can the stability and service life of the equipment be improved, but also the noise can be effectively reduced and the working environment quality can be improved. Therefore, vibration characteristics should be fully considered in the structural design stage of the servo valve, and the method of combining simulation with experiment should be adopted to ensure the good dynamic performance of the sheet metal machine frame under complex working conditions.



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