Mechanical vibrations: active and passive control by Tomasz Krysinski

By Tomasz Krysinski

For all rotational machines, the research of dynamic stresses and the ensuing vibrations is a crucial topic. by way of helicopters and piston engines, this research turns into an important. From the layout of components operating lower than pressure to the relief of the vibration degrees, the luck of a venture lies commonly within the fingers of the dynamicists.

The authors have mixed their abilities and adventure to supply a whole presentation at the matters concerned. half one describes, in concrete phrases, the most dynamic phenomena and the way they are often saw in fact. half provides information regarding the modeling equipment required to appreciate the dynamic phenomena and strengthen options able to removing the main critical results.

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Extra resources for Mechanical vibrations: active and passive control

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For this type of balancing, the bearings must be more rigid than the shaft flexibility. 38.

16. 27] These two relations make it possible to calculate the value of the mass to be added (ms) and its position (rs and ϕs). We notice that there are three variables for two equations. We often set one of the parameters, r = re = rs. 3. 8 g must be added, moved away with + 45° from the test mass. 4. Principle for the set of bearings A series of this type of measurements must be taken for each bearing. Each bearing is analyzed successively. Unfortunately, adding a mass in the balancing plane of a bearing will disturb the other bearings.

The hard-bearing machine For hard-bearing machines, balance is obtained by measuring the reactions at the bearings. This device is often called “subcritical balancing machine” because balance is obtained at a speed of rotation less than the natural angular frequency ωp. Reactions at the bearings are proportional to Ω2. For this type of machines, high balancing speeds are used in order to improve measurement precision. 11. The amplitude/frequency feature of a hard-bearing balancing machine The balancing speed cannot get close to the first critical angular frequency in order to avoid the effect of dynamic amplification.

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