A Reference number ISO 1081641998E INTERNATIONAL STANDARD ISO 108164 First edition 19980701 Mechanical vibration Evaluation of machine vibration by. Part 7 Mechanical Vibration-Measurement, Evaluation And Limits' title='Part 7 Mechanical Vibration-Measurement, Evaluation And Limits' />Noise and Vibration. FCRI India. SOUND POWER MEASUREMENTSound pressure level is a measure of the small pressure fluctuations in the air superimposed on the normal atmospheric pressure. Noise levels produced by a machine or a piece of equipment can be easily measured with a sound level meter. The meter shows the sound pressure level at the measurement position. The sound level depends on how far away the meter is from the machine, and on the measuring environment. This sound level is important because it relates to the loudness of the sound and to the potential damaging effect on hearing. A sound power level on the other hand is a measure of the total noise radiated by the machine in all directions. It is a property of the machine and is essentially independent of the measuring environment. Sound power levels are useful to equipment manufacturers, buyers, installers, and users for calculating the sound pressure level from a machine, or several machines, at a given distance in a given environment, such as a factory, workshop, office or the home Comparing the noise output from different machines Setting specifications for the maximum permitted noise from a machine Comparing machines before and after modifications to reduce the noise. Sound power is measured in watts picowatts, and sound power levels are traditionally given in decibels d. B re 1p. W, where 0 d. B corresponds to 1 picowatt. FCRI carries out sound power measurements using precision method and engineering method, conforming to International Standards ISO. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online. Easily share your publications and get. The measurements are made in Hemi anechoic chamber or outside free field area over a reflecting plane. Items tested include industrial machinery, DG sets, control valves, electronic and business machines, etc. Sound Power determination Precision method If directional information is required then the measurements must be made under free field conditions. Tests are carried out according to ISO 3. Hemi anechoic conditions. Twenty one microphone positions are used over an imaginary hemispherical measurement surface. Part 7 Mechanical Vibration-Measurement, Evaluation And Limits' title='Part 7 Mechanical Vibration-Measurement, Evaluation And Limits' />Mechanical vibration Evaluation of machine vibration by measurements on nonrotating parts Part 3 Industrial machines with nominal power above 15 kW and nominal. Pump vibration standards 6 Conditions A All major rotating components shall be balanced B Vibration limits should be achieved by balance to grade G6. Cave Shooting Artworks more. ISO 19401. Professional Certificate of Competency in Gas Turbine Engineering provides a comprehensive overview in the area of Gas Turbine Engineering and is designed to develop. The Mechanical Engineering Technology program equips students with the tools to apply scientific and engineering principles to solve mechanical engineering design. ISO 1 ISO 99. ISO 12016 Geometrical product specifications GPS Standard reference temperature for the specification of geometrical and dimensional properties. Foot valves are specially designed check valves used at the inlet of the suction lift line to maintain pump prime, by maintaining liquid over the firststage impeller. Octave or one third octave spectra are measured at each microphone position and the Sound Power Level is computed. Sound Power determination Engineering method. In engineering method the measurements must be made under free field conditions over a reflecting plane. Tests are carried out according to ISO 3. Ten or more microphone positions are used over an imaginary hemispherical or a parallopiped measurement surface. Octave or one third octave spectra are measured at each microphone position and the Sound Power Level computed. Measurements made in conformity with this International Standard should result in standard deviations not exceeding those shown in table below. VIBRATION TESTING AND ANALYSISIn its simplest form, vibration can be considered to be the oscillation or repetitive motion of an object around an equilibrium position. The equilibrium position is the position the object will attain when the force acting on it is zero. This type of vibration is called whole body motion, meaning that all parts of the body are moving together in the same direction at any point in time. The vibratory motion of a whole body can be completely described as a combination of individual motions of six different types. These are translation in the three orthogonal directions x, y, and z, and rotation around the x, y, and z axes. Any complex motion the body may have can be broken down into a combination of these six motions. Such a body is therefore said to possess six degrees of freedom. If an object were restrained from motion in all directions except one is called a single degree of freedom system. The vibration of an object is always caused by an excitation force. This force may be externally applied to the object, or it may originate inside the object. This is the reason that vibration analysis can determine the excitation forces at work in a machine. These forces are dependent upon the machine condition, and knowledge of their characteristics and interactions allows one to diagnose a machine problem. The continuing demand for engineering products which can withstand severe dynamic environments has led to a steady growth in the sophistication of vibration test procedures. Increased reliability and performance are required of many products ranging from consumer electronics to military hardware. A demonstration of survival in a simulated vibration environment is a prime requirement of many procurement specifications. FCRI vibration test facility can simulate sine, random, shock, sine on random, random on random and RRS signals for the frequency range of 5. Hz to 2. 50. 0Hz with maximum force rating of 6. The amplitude can be generated is acceleration of 9. FCRI also has required software to import recorded data simulate field vibrations on the table, within the limitations of theshaker. For vibration analysis FCRI has latest instrumentation with analysis software. Vibration analysis can be done to find out the actual cause for vibration and also have facility for natural frequency, mode shape determination. FCRI has expertise instrumentation for hull vibration measurement analysis on board ships. It also has facility for cavitation studies and analysis. CONDITION MONITORING Condition Monitoring is most frequently used as a Predictive or Condition Based maintenance technique. However, there are other predictive maintenance techniques that can also be used, including the use of the Human Senses look, listen, feel, smell etc., machine performance monitoring, and statistical process control techniques. Vibration is probably the most important indicator of the mechanical integrity of rotating machinery. Like the heartbeat of humans, Vibration within rotating machinery tells a great deal about the health of that machinery. For successful diagnostics and trouble shooting of rotating machinery, the Vibration Analyst must ensure accurate and repeatable quality data collection, and have a detailed understanding of the machinery design and operating dynamics to accurately interpret typical fault patterns and symptoms. By doing the right Condition Monitoring the following can be achieved NOISE TESTING FLOW CONTROL DEVICEFlow control device is a major source of noise pollution in many fluid processes in gas regulator systems, chemical plants, pulp and paper mills etc. Due to noise legislations and increasing public reluctance to accept excessive noise generating devices, manufactures are forced to employ better design and use of downstream noise reduction modules such as cartridges etc. Therefore now it is necessary to check for the noise levels and also check for acoustic hydraulic parameters of the downstream cartridges at the manufacturing stage itself. To cater to the aerodynamic noise studies of the flow control devices, NVL has made a facility in conjunction with the High Pressure Air Test facility as per the standard ISA 7. This standard provide a procedure for testing, measuring and reporting the aerodynamic noise generating characteristics of flow control device and its associated piping. The test rig is capable of operating over a range of flow rate with pressure at the device under test ranging from 1. The compressed air is drawn from storage tanks and upstream pressure is normally maintained up to about 1. Compressed air storage of 4. The necessary instrumentation for both acoustic, pressure and flow parameters is also available.