Hello everyone at the Forum, I hope you are all having a good morning. I am seeking your assistance with the following inquiry: What are the acceptable vibration limits for different types of machines at specific frequencies? This includes: - Operating Speed (1x RPM) - 2x RPM - 3x RPM - 2x Line Frequency in an Induction Motor - 1x and 2x Rotor Bar Pass Frequency in an Induction Motor - Blade Pass Frequency and its harmonics - Gear Mesh Frequency and harmonics - Belt Frequencies and harmonics - Rolling Element Bearing Frequencies and harmonics. Wishing you all the best and continued success. ------------------------------ jorge luis ------------------------------
Dear sirs, I am eager to assist with any suggestions provided to address the query on "How Much is Too Much at Specific Vibration Frequencies for Various Machine Types." As an experienced risk and material scientist, I am willing to collaborate and explore solutions. Wishing you the best of luck in your endeavors. Best regards, Dr. Stefán Einarsson Risk and Material Scientist Vallarási 5, 110 ReykjavÃk Original Message: Sent: 2/5/2024 12:01:00 PM From: jorge luis Subject: How Much is Too Much at Specific Vibration Frequencies for Various Machine Types? Messrs. Forum, Good morning, please provide your support regarding the following query: - vibration levels at different speeds for various machine types - vibration frequency specifics for induction motors - analyzing rotor bar pass frequency in induction motors - understanding blade pass, gear mesh, belt, and bearing frequencies Greetings and best wishes. jorge luis
Dear Jorge, I recommend checking out the Narrowband Spectral Alarm Envelopes by Technical Associates of Charlotte for valuable information on vibration frequencies for various machine types. If you have any specific questions on how much vibration is too much at different frequencies, such as operating speed, rotor bar pass frequency, gear mesh frequency, and more, feel free to reach out for support. Wishing you success in your endeavors. Best regards, Michalis Hadjiandreou.
When it comes to specific vibration frequencies for different types of machines, it's important to note that the limits can vary based on the machine type and the contributing factors to overall vibration amplitude. For example, the ISO 10816-x series of standards typically applies to machine vibration limits, with exceptions for specific scenarios like "Rolling Element Bearing Frequencies and Harmonics". In such cases, identifying peaks in the spectrum originating from a rolling bearing could indicate a fault in the bearing, regardless of peak amplitudes. In addition to the ISO 10816 standard, the EASA AR100 standard for electric motors also provides vibration limits, particularly for electric motors. These limits align with the NEMA MG1-Part 7 standard, specifically for new motors tested on a resilient base without a load. Special consideration is given to vibration at 2x line frequency on induction motors in the NEMA standard, especially when there is a beat frequency between vibrations at 2xRPM and 2x line frequency. For rotor bar pass frequencies on induction motors, the ISO 10816-3 limits are applicable if they contribute to overall vibration amplitude. These frequencies are usually present at low amplitudes and may indicate a potential rotor cage fault if they increase over time. Furthermore, the Hydraulic Institute offers overall vibration limits for various pump types as an alternative to ISO 10816-3, covering blade pass frequency on pumps. ISO 10816-3 also addresses vibration at belt frequencies, gear mesh frequencies, and other relevant frequencies like rolling element bearing frequencies. Overall, understanding the specific vibration frequencies and their corresponding limits based on industry standards is crucial for ensuring the optimal performance and health of machinery. For a comprehensive list of published ISO 10816-x standards, you can refer to the list below: - ISO 20816-1:2016 - ISO 20816-2:2017 - ISO 20816-3:2022 - ISO 20816-4:2018 - ISO 20816-5:2018 - ISO 10816-6 - ISO 10816-7 - ISO 10816-8 - ISO/DIS 20816-9 - ISO/AWI 20816-10 For further inquiries or assistance, feel free to reach out. Success in your endeavors. Warm regards, Gene Vogel, EASA Pump & Vibration Specialist
When dealing with the 1x and 2x Rotor Bar Pass Frequency in an Induction Motor, it is crucial to analyze multiple RPM frequencies, typically ranging from 4-6, as side frequencies may not be initially visible in the first few RPM harmonics. Issues with the rotor cage can manifest as a prominent peak at either 1 or 2 times the number of rotor bars multiplied by the RPM frequency, accompanied by two side peaks at 100Hz. Therefore, it is highly recommended to inspect the rotor cage for bars when conducting maintenance on an electric motor for optimal performance and longevity. Best of luck with your endeavors. ------------------------------------------------ Pantović Zoran ------------------------------------------------ Original Sent Message: How Much is Too Much at Specific Vibration Frequencies for Various Machine Types? Good day, I am seeking assistance on the following matter: What are the acceptable limits for vibration frequencies in different machine types? - At Operating Speed (1x RPM) - At 2x RPM - At 3x RPM - At 2x Line Frequency in an Induction Motor - At 1x and 2x Rotor Bar Pass Frequency in an Induction Motor - At Blade Pass Frequency and Harmonics - At Gear Mesh Frequency and Harmonics - At Belt Frequencies and Harmonics - At Rolling Element Bearing Frequencies and Harmonics Warm regards and wishing you success. ------------------------------------------------ Jorge Luis ------------------------------------------------
Hi Jorge Luis, a comprehensive answer to your question would indeed be quite complex. Generally, each machine type and manufacturing industry will have different acceptable standards for vibration limits based on ISO (International Organization for Standardization) standards. The acceptable vibration levels also vary considering the machine's operational conditions, its complexity, build, and design. The best approach would be to consult with a condition monitoring professional or the machine manufacturer to determine specific standards. They usually would consider various particular factors such as structural resonance, bearing frequencies, and any specific machine components with unique frequencies such as gear mesh or blade pass. Understanding these details can help you establish a meaningful and effective vibration analysis program.
Hi Jorge, that’s a great question! The acceptable vibration limits can vary quite a bit depending on the type of machinery and industry standards, but generally, for rotating machinery, a peak of 0.1 to 0.2 inches per second (ips) for 1x RPM is a common threshold to aim for, while frequencies like the blade pass or gear mesh can be more sensitive, often requiring even lower limits to avoid operational issues. It might be helpful to look into ISO standards (like ISO 10816) that provide guidelines specific to various machines, which can give you a more tailored reference for your specific application. Hope that helps!
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Answer: - The acceptable vibration limits for different types of machines at specific frequencies vary depending on factors like operating speed, RPM multiples, line frequency in an induction motor, rotor bar pass frequency, blade pass frequency, gear mesh frequency, belt frequencies, and rolling element bearing frequencies.
Answer: - Vibration limits can vary based on the type of machine and its specific operating characteristics. For example, induction motors may have different acceptable vibration limits compared to machines with gear systems or rolling element bearings.
Answer: - Adhering to acceptable vibration limits is crucial for ensuring the smooth operation, longevity, and reliability of machines. Excessive vibrations can lead to increased wear and tear, reduced efficiency, and potential breakdowns if not addressed in a timely manner.
Answer: - Vibration measurement and monitoring tools such as accelerometers, vibration analyzers, and condition monitoring systems can be used to assess and track vibrations in machines. Regular inspections and maintenance can help identify any deviations from acceptable limits and facilitate timely corrective actions.
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