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.
Read or Download Mechanical vibrations: active and passive control PDF
Best machinery books
This textbooks demonstrates the appliance of software program instruments in fixing a chain of difficulties from the sector of designing strength procedure constructions and platforms. It comprises 4 chapters: the 1st bankruptcy leads the reader via all of the levels useful within the strategies of desktop aided modeling and simulation.
A completely illustrated reference publication giving an easy-to-understand advent to compliant mechanismsA extensive compilation of compliant mechanisms to offer suggestion and assistance to these attracted to utilizing compliant mechanisms of their designs, the guide of Compliant Mechanisms comprises portraits and outlines of many compliant mechanisms.
Concentrating on easy lubrication difficulties this ebook deals particular engineering functions. The ebook introduces equipment and courses for an important lubrication difficulties and their strategies. it's divided into 4 components. the 1st half is set the overall fixing tools of the Reynolds equation, together with ideas of Reynolds equations with various stipulations and their discrete varieties, equivalent to a steady-state incompressible slider, magazine bearing, dynamic bearing, fuel bearing and grease lubrication.
- Noise and Vibration in Friction Systems
- Wasserkraftanlagen: Planung, Bau und Betrieb
- High Performance AC Drives: Modelling Analysis and Control
- Capture Pumping Technology
Extra resources for Mechanical vibrations: active and passive control
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.