Respon Vibrasi Overall dan Temperatur Komponen Mesin Terhadap Misalignment Axial

Misalignment is one of the problems that often occurs in rotary equipment. In this paper, the observation was done to the rotary machine model in response to changes of axial misalignment by using vibration meter and infrared thermography camera. The model was a machine series, consisting of electric motor and disc which was connected by 3 Jaw flexible coupling. The shafts were positioned into several axial misalignment conditions to see the effect on the overall vibration value and its component temperature. The result of vibration observation showed that under certain conditions, by increasing shaft misalignment then the overall vibration value tends to decrease. With the decrease of overall vibration value, the machine condition was not in better condition. This was indicated by observing the temperature of the components in this condition, which showed the opposite fact. As misalignment increases, the temperature of the engine components also increases.

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Vibration Analysis of Rotor - Coupling - Bearing System With Misaligned Shafts

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General ◽

10.1115/96-gt-012 ◽

1996 ◽

Cited By ~ 3

Author(s):

A. Sreenivasa Rao ◽

A. S. Sekhar

Keyword(s):

Theoretical Model ◽

Finite Elements ◽

Vibration Analysis ◽

Rotating Machinery ◽

Value Analysis ◽

Flexible Coupling ◽

Eigen Value ◽

Shaft Misalignment ◽

Reaction Forces ◽

Bearing System

The shaft misalignment, even being a common fault in rotating machinery, is not sufficiently studied. The present work addresses effects of misalignment in rotating machinery. An attempt to give a theoretical model for a rotor-coupling-bearing system has been done. The rotor-bearing system including the flexible coupling is modelled using the finite elements. The reaction forces and moments developed due to flexible coupling misalignment both for parallel and angular are derived and introduced in the model. Vibration analyses such as eigen value analysis and unbalance response are carried out for the rotor system with misaligned shafts.

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A Study on the Shape of the Rotor to Improve the Performance of the Spoke-Type Permanent Magnet Synchronous Motor

Energies ◽

10.3390/en14133758 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3758

Author(s):

Min-Jae Jeong ◽

Kang-Been Lee ◽

Hyun-Jo Pyo ◽

Dong-Woo Nam ◽

Won-Ho Kim

Keyword(s):

Permanent Magnet ◽

Centrifugal Force ◽

Electric Motor ◽

High Speed ◽

Control Method ◽

Permanent Magnet Synchronous Motor ◽

Washing Machine ◽

Machine Model ◽

Field Weakening ◽

Rotor Shape

This paper describes a study on the improvement of the dehydration performance of the conventional washing machine model. Recently, as interest in improving the dehydration performance of washing machines has increased, the need for a study on a high-speed electric motor has emerged. However, this conventional spoke-type PMSM has difficulty in speeding up due to the following problems. First, field weakening control is indispensable for high-speed operation of an electric motor. This control method is a big problem in causing torque drop and irreversible demagnetization of the motor. Moreover, the centrifugal force increases during high-speed operation, which adversely affects the stiffness of the motor. Therefore, in this paper, a new rotor shape of spoke-type PMSM was proposed to solve the above problem.

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Design Build Dryer Machine Frying Results Nuts Eggs

Teknomekanik ◽

10.24036/tm.v1i1.572 ◽

2018 ◽

Vol 1 (1) ◽

pp. 18-23

Author(s):

Purwantono Purwantono ◽

Waskito Waskito ◽

Putu Satria Rinaldo ◽

Primawati Primawati

Keyword(s):

Stainless Steel ◽

Centrifugal Force ◽

Electric Motor ◽

Design Concept ◽

Drying Oil ◽

Steel Container ◽

Design Build ◽

Container Tube ◽

Engine Components ◽

Design Drawing

The purpose of this research is to design oil drying machine in nurts eggs to get the result of working drawing and to determine the peanut dryer component. The concept of planning oil drying machine in nurts eggss is by conducting a direct survey of the egg industry, the problems arise still high levels of oil in manually dried peanuts, then carry out the design concept. Based on the concept, then designed a design drawing. The result of this final task is in the form of design or design of oil oven dryers that utilize centrifugal force for drying oil, oil stainless steel rotary tube components, stainless steel container tube with stainless steel , axle components to support tubes of 22mm diameter and 520mm length, pulleys with a 3/6 ratio as a rotary reducer of an electric motor of 0.5 HP 1400 rpm to 500 rpm. Frame profile machine L 40 x 40 x 4 mm 42 st material and engine components made by Fernando Ferry from material st 37.

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Vibration analysis of rotors for the identification of shaft misalignment Part 1: Theoretical analysis

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/0954406041991297 ◽

2004 ◽

Vol 218 (9) ◽

pp. 971-985 ◽

Cited By ~ 18

Author(s):

P N Saavedra ◽

D E Ramírez

Keyword(s):

Finite Element ◽

Stiffness Matrix ◽

Vibration Analysis ◽

Frequency Response Function ◽

Mechanical Vibration ◽

Element Analysis ◽

Flexible Coupling ◽

The Finite Element Analysis ◽

Shaft Misalignment ◽

Coupling Stiffness

Shaft misalignment in machinery causes preload forces to be generated in couplings which are then transmitted to the different machine components, thus reducing their lifetime. Shaft misalignment is a major cause of vibration in machines. Based on tests on coupling stiffness, a new coupling finite element stiffness matrix has been deduced. This has been used in the finite element analysis of a two-rotor system connected by a flexible coupling, to calculate the mechanical vibration resulting from mixed angular and parallel shaft misalignments with residual unbalance. The calculated vibration spectra were determined for two flexible couplings: a three-pin Renold coupling and a three-jaw Lovejoy coupling. The results and analysis indicate that the vibration generated by shaft misalignment is caused by the variation in coupling stiffness on rotation, and that the forcing frequencies generated are harmonics of the shaft's speed and directly depend on the frequency of the variation in coupling stiffness. In addition, the amplitudes of the measured vibratory components were found to rely directly upon the frequency response function that is related to the coupling and measurement points.

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Elaboration of a method of electromechanical drive systems status estimation (at an example of a roll-table roller) by application statistical analysis of electric motor current signal

Ferrous Metallurgy Bulletin of Scientific Technical and Economic Information ◽

10.32339/0135-5910-2020-7-728-733 ◽

2020 ◽

Vol 76 (7) ◽

pp. 728-732

Author(s):

A. V. Kozhevnikov ◽

Yu. V. Platonov

Keyword(s):

Statistical Analysis ◽

Electric Motor ◽

Current Data ◽

Point Of View ◽

Current Signal ◽

Machine Model ◽

Software Products ◽

Distribution Form ◽

Automation Systems ◽

Electromechanical Equipment

Loss enhancement because of extraordinary stoppage of technological equipment due to breakage of separate equipment units is an actual task. Existing methodologies of equipment status estimation, based on planning systems, instrumental checks, and personal experience do not ensure always revealing of the incipient of breakdown status in separate elements of the equipment, which often results in breakdown situations and extraordinary repairs. Studies of analysis statistical methods application were accomplished for early revealing indications of electromechanical equipment failure at an example of predicting breakdown status of rollers of rolling mill roll-table. As a parameter under the study, the current signal was chosen, measured at the electric motor of a roller, since it reacts practically without inertia on external oscillations in mechanical part of the facility. The variations of the current curve form reflect any variations of the equipment operation character. From this point of view, the electrical motor itself can be considered as a technical mean of diagnostics of mechanical oscillations in the load with a short response time. Statistical analysis of electric motors current data within one month of roll-table rollers operation, within which 14 jams took place, was carried out. Based on the results of the analysis it was determined, that the process of the jams intensification for various rollers has a similar character. A possibility wa shown to predict the developing and identification of a roller defect by a type of a jam several hours before commencement of the breakdown status, based on one parameter – the load current. Based on sampling of the rollers statistical data in various operation modes and mark of breakdown stops, it is possible to learn the nonlinear machine model for classification of a roller breakdown degree by extracted from the distribution form of statistical current characteristics. The elaborated models in the form of software products and machine codes can be implemented in algorithms of existing at a plant automation systems and technological process and equipment status control systems.

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Increasing fretting resistance of flexible element pack for rotary machine flexible coupling Part 1. Analysis of the reasons affecting fretting resistance of flexible elements for expansion couplings

Journal of Physics Conference Series ◽

10.1088/1742-6596/1741/1/012048 ◽

2021 ◽

Vol 1741 ◽

pp. 012048

Author(s):

V Tarelnyk ◽

D Hlushkova ◽

V Martsynkovskyy ◽

M Dumanchuk ◽

B Antoszewski ◽

...

Keyword(s):

Flexible Coupling ◽

Rotary Machine ◽

Flexible Element

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Challenges Involved in Piston Top Ring Designs for Modern SI Engines

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.1364520 ◽

2000 ◽

Vol 123 (2) ◽

pp. 448-459 ◽

Cited By ~ 28

Author(s):

R. Rabute´ ◽

T. Tian

Keyword(s):

Piston Ring ◽

Engine Test ◽

Environment Protection ◽

Oil Consumption ◽

Potential Influence ◽

Ring Groove ◽

Higher Power ◽

Si Engines ◽

Engine Components ◽

Component Temperature

Driven by energy conservation and environment protection, modern SI engines are required to have higher and higher power density. Consequently, engines and engine components are becoming tighter and lighter, and engines are more often operated at elevated speed and component temperature. Piston and piston ring designs thus face constant challenge to provide proper control of blow-by, oil consumption, friction, wear, and oil consumption. This paper is intended to give an overview of the problems associated with top ring performance in modern SI engines, the mechanisms behind these problems, and possible solutions. The analysis is based on engine test data and computer models. Major topics covered in this paper include (1) top ring flutter and collapse, and their influence on blow-by; (2) top ring reverse flutter and its influence on oil consumption; (3) contact between top ring and its groove, and its potential influence on ring/groove wear and micro-welding; (4) top ring/liner lubrication and its influence on ring face friction, wear, and scuffing.

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