SolidWorks Simulation:黑胶唱片机盖支撑垫的模态分析 - 机械必威体育网址 - Powered by Discuz!

After all these years in storage the turntable was in great shape. Everything worked perfectly except for the vibration isolating rubber feet. Out of the four feet, three had the material break down, leaving them brittle and cracking with large sections missing or crumbling. Obviously this was not good news as the turntable needs to sit level when in use

I searched the internet for replacements but could not find any that were suitable. The next step was to make our own. Using Solidworks, my father reverse engineered a new set of feet for the turntable. After a few design iterations, the new feet were a little more stout than the originals. Thanks to SOLIDWORKS SImulation, the new feet exhibited the mechanical properties we desired.

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We did not know the type of rubber used in the original foot. This was not a problem as we used Simulation Premium and the Nonlinear material models to determine a relative stiffness. By physically testing the original foot under a 2.5 lb. vertical load we measured a 0.1 in. displacement. Using Simulation and varying the material properties we found that a Shore Value of 70, gave a 0.095 in.corresponding vertical displacement. Feeling confident in the design the next step was to test for vibrational characteristics.

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The turntable operates at 33 1/3, and 45 RPM. This equates to 0.556, and 0.75 Hz respectively. SOLIDWORKS Simulation Professional made it possible to test the resonant frequency of the design. The analysis results predicted the lowest resonant frequency at 16.32 Hz. This is well above the induced vibration due to the turning motor and drive mechanism, and lower than the 20,000-20 Hz most receivers output.

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Next we turned to the Stratasys Polyjet line of printers that delivered an amazing print. The Polyjet printed a 70 Shore value model that behaved just like we expected. Not only did the print physically work, it looked great too.

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