| dc.description.abstract | This article is for the discussion of vertical rotating machines that were commonly used in industry, like mixer, cooling tower, drilling machine, deep water pump and so on. By using hand-made small model to simulate the rotating system, and also installed “liquid equalizing ring” as the vibration reducing device. Use spectrum analyzer, tachometer to measure the vibration data, and compare the data analyzed with diagnosis software to the simulation system, and obtained vibration relationship between eccentric mass and “liquid equalizing ring” in specific frequency, then record and store the result.
The steps we took are (1) Use screws with different masses as the eccentric source, (2) Lock them around the surrounding of the rotating plate, (3) Measure the vibration with different frequencies, (4) Install “liquid equalizing ring” to observe the vibration variance, and then evaluate the influence and efficiency for the vibration reducing. In order to design an ideal vibration reducing device, we apply the dynamic rotation theory and vibration absorber equation to discuss the influence among the mass, damper, and spring.
The machine vibration is always exist and can’t be avoided due to the unbalance, misalignment, bolt loose, manufacturing tolerance, assembly tolerance, non-uniform material, asymmetric combination, impurities, bolt, nut and rivet different sizes, poor welding, eccentric rotor, distortion, bearing abrasion, lubrication and electrical factors. Above all the causes, unbalance is the most significant problem, and it is also the best way to improve efficiency.
The reliability of a machine directly affects the product’s quality and quantity, especially in the automation industry. The impact for the market competency is also huge. So, the improvement for machine’s stability and reliability should be started from reducing the vibration. | en_US |