Dynamics Lab Report (original) (raw)
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Chapter 21 : Balancing of Rotating Masses
Theory of Machines way that the centrifugal force of both the masses are made to be equal and opposite. The process of providing the second mass in order to counteract the effect of the centrifugal force of the first mass, is called balancing of rotating masses.
Design and Construction of an Improved Balancing Machine
International Journal of Science, Technology and Society
The balancing machine is equipment used for the following-determining the proper location and amount of balance work in a rotor (applicable in a motor amerture)-determining the position and magnitude of a given mass to balance the unbalance centrifugal effect of a system (this is applicable in determining automobile crankshaft mass distribution. This equipment was designed and constructed for the use of the Faculty Engineering, Lagos State University the Mechanics of Machine Laboratory since the possibility of acquiring one is remote due to the non-availability of the hard currency needed. Moreover the need to take students outside the university to use the equipment has totally been eliminated thereby saving valuable time and cost. The objective of looking inwards towards technology acquisition is also manifested.
Theoretical And Experimental Method Of Rotating Discs Balancing
AL-Rafidain Engineering …, 2008
In this paper, a single plane balancing method based on vibration amplitude readings only, has been adopted. This method is discussed in detail, including an analytical basis and a practical implementation procedure. Four runs of trial mass are required to ...
This report was written to examine the methods of statically and dynamically balancing a rotating system. This experiment focuses on a more theoretical approach of balancing using the machine provided by TecQuipment's Static and Dynamic Balancing (TM1002). Unbalance is the problem for many current and past operating machines as it produces unwanted vibrations that decrease the life of machines and parts. Vibrations can even lead to catastrophic failures and dangerous situations. In fact, the faster something rotates, the more force it creates (centripetal force equation), so it is even more important to be balanced on higher speeds. Different experiments along with theories using the machine was conducted to prove that a statically balanced system does not mean it is automatically dynamically balanced. There are two types of moments in a rotating system and in this experiment, they are stated as (i) Block moment (rotation on horizontal axis) and the (ii) Twisting Moment (centrifugal force or couple). To achieve dynamic balance, both (i) and (ii) need to equal to zero, which is also referred to as 'balance'. Rotating systems with two, three and four masses were used as examples in this experiment to show how a system is statically and dynamically balanced just by using the moments equation and looking at which direction the force is heading towards. Blocks attached to shafts with angles on them require more calculation than symmetrical configurations as the block moment and twisting moments becomes a lot more complex. Therefore, drawing vector diagrams and moment triangles/ polygons can help visualize the angles more easily. This report concluded that static and dynamic balancing are important factors to consider for engineers building vehicles or machines with any rotating parts as balancing them can help reduce risks of damage and improve its functionality. Static and dynamic balancing can be calculated using moments equation and understanding the difference between both can help engineers create a better and safer machine.
Eastern-European Journal of Enterprise Technologies, 2017
Досліджено вплив розміру та кількості корегувальних вантажів (куль або циліндричних роликів) в автобалансирі на його балансувальну ємність та на тривалість перебігу перехідних процесів при автобалансуванні роторних систем. При цьому знайдені розміри та кількість корегувальних вантажів, при яких досягається найбільша балансувальна ємність автобалансира та найменша тривалість перехідних процесів Ключові слова: автобалансир, автобалансування, куля, циліндричний ролик, балансувальна ємність, перехідні процеси, оптимізація Исследовано влияние размера и количества корректирующих грузов (шаров или цилиндрических роликов) в автобалансире на его балансировочную емкость и на продолжительность протекания переходных процессов при автобалансировке роторных систем. При этом установлены размер и количество корректирующих грузов, при которых достигается наибольшая балансировочная емкость автобалансира и наименьшая продолжительность переходных процессов Ключевые слова: автобалансир, автобалансировка, шар, цилиндрический ролик, балансировочная емкость, переходные процессы, оптимизация
A Computational Approach to Analyze Unbalancing in Rotational Systems
Scientific research and essays
Rotational systems are widely used in industrial application and its monitoring can improve production and decrease stop times of machines, for example. In industry these kind of problem is, in general, solved using a vibration meter and a phase meter in order to obtain the necessary data to correct the rotor unbalancing. This work presents the development of a computational application, using LabVIEW, for improving the measure of unbalancing in a rotational system. The application developed in this work proposes that the phase and vibration be digitally measured. The idea is to use a piezoelectric accelerometer to measure vibration intensity and an inductive sensor to replace the phase meter. An algorithm to calculate phase angle is also described. With the application developed we can replace a vibrometer by a PC compatible computer that can calculate the unbalancing of a rotor too. In order to evaluate the results a test bench composed by a DC motor (1585 rpm and 0.19 HP) coupled to a shaft made of steel with a rotor on it, were assembled. In the test bench we simulated an unbalancing rotor and use the application to calculate the balancing mass and its phase angle. Preliminaries results shown a good agreement between the real mass and phase angle and the one calculated by the application.