ISO 14839-3:2006 PDF

Mechanical vibration — Vibration of rotating machinery equipped with active magnetic bearings — Part 3: Evaluation of stability margin

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Title (English):

ISO 14839-3:2006

Mechanical vibration — Vibration of rotating machinery equipped with active magnetic bearings — Part 3: Evaluation of stability margin

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 35
Publication date:: September 18, 2006
Edition:: ISO IS 14839 edition 1 version 1
ICS:: 17.160

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Description (English):

ISO 14839-3:2006 establishes the stability requirements of rotating machinery equipped with active magnetic bearings (AMB). It specifies a particular index to evaluate the stability margin and delineates the measurement of this index. It is applicable to industrial rotating machines operating at nominal power greater than 15 kW, and not limited by size or operational rated speed. It covers both rigid AMB rotors and flexible AMB rotors. Small-scale rotors, such as turbo molecular pumps, spindles, etc., are not addressed. ISO 14839-3:2006 concerns the system stability measured during normal steady-state operation in-house and/or on-site. ISO 14839-3:2006 does not address resonance vibration appearing when passing critical speeds. The regulation of resonance vibration at critical speeds is established in ISO 10814.

Technical details

Technical committee: ISO/TC 108/SC 2 - Measurement and evaluation of mechanical vibration and shock as applied to machines, vehicles and structures
SKU: ISO 14839-3:2006

Abstract

Overview

ISO 14839-3:2006 - Mechanical vibration: Vibration of rotating machinery equipped with active magnetic bearings (AMB) - Part 3: Evaluation of stability margin - defines how to evaluate the stability robustness of rotating machines that use active magnetic bearings. The standard applies to industrial rotating machinery with nominal power greater than 15 kW (no limit on size or rated speed), and covers both rigid and flexible AMB rotors during normal steady‑state operation. It specifies a stability index, measurement procedures and evaluation criteria to quantify the stability margin required for safe, reliable AMB operation.

Key Topics

Scope and applicability
- Targets industrial rotating machinery with AMBs; excludes small-scale rotors (e.g., turbomolecular pumps, spindles).
- In‑house evaluation is required prior to shipping; on‑site testing is by agreement.
Stability index and measurement
- Defines a specific index for evaluating stability margin and the method to measure it (open‑loop/closed‑loop transfer functions).
- Measurement methods use two‑channel FFT analysis and injection of excitation to derive open‑loop G_o(jω) and closed‑loop G_c(jω).
Control and system characterization
- Describes AMB feedback architecture (typically multi‑axis control - e.g., five axes) and the relationship between plant and controller transfer functions.
Analysis tools and criteria
- Uses industry standard robustness measures such as gain margin, phase margin, Nyquist plots, and the sensitivity function (1 / [1 + G_o(jω)]).
- Emphasizes the minimum distance of the Nyquist locus to the critical point (−1,0) and maximum sensitivity as conservative stability indicators.
Preceding investigations
- Differentiates run‑up/Q‑factor (resonance) evaluations - covered by ISO 10814 - from steady‑state control stability covered here.
Supporting material
- Annexes include case studies, field data and analytical examples to guide measurement and evaluation.

Applications

Who uses ISO 14839-3:

AMB system vendors and OEMs for design verification and shipping acceptance testing.
Test and commissioning engineers performing in‑house or on‑site stability assessments.
Mechanical and control engineers specifying robustness margins in contracts and maintenance procedures. Practical uses:
Contractual acceptance criteria for AMB‑equipped rotating machinery
Commissioning checklists and performance reports
Diagnostic baseline for maintenance and troubleshooting of AMB control loops

Related Standards

ISO 14839-1: Vocabulary (part of the same series)
ISO 14839-2: Evaluation of vibration (related AMB vibration assessment)
ISO 10814: Regulation of resonance vibration and Q‑factor requirements during run‑up and critical speed passage

Keywords: ISO 14839-3, active magnetic bearings, AMB, stability margin, Nyquist plot, sensitivity function, gain margin, phase margin, rotating machinery, vibration standards.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics

Scope and applicability
- Targets industrial rotating machinery with AMBs; excludes small-scale rotors (e.g., turbomolecular pumps, spindles).
- In‑house evaluation is required prior to shipping; on‑site testing is by agreement.
Stability index and measurement
- Defines a specific index for evaluating stability margin and the method to measure it (open‑loop/closed‑loop transfer functions).
- Measurement methods use two‑channel FFT analysis and injection of excitation to derive open‑loop G_o(jω) and closed‑loop G_c(jω).
Control and system characterization
- Describes AMB feedback architecture (typically multi‑axis control - e.g., five axes) and the relationship between plant and controller transfer functions.
Analysis tools and criteria
- Uses industry standard robustness measures such as gain margin, phase margin, Nyquist plots, and the sensitivity function (1 / [1 + G_o(jω)]).
- Emphasizes the minimum distance of the Nyquist locus to the critical point (−1,0) and maximum sensitivity as conservative stability indicators.
Preceding investigations
- Differentiates run‑up/Q‑factor (resonance) evaluations - covered by ISO 10814 - from steady‑state control stability covered here.
Supporting material
- Annexes include case studies, field data and analytical examples to guide measurement and evaluation.

Applications

Who uses ISO 14839-3:

AMB system vendors and OEMs for design verification and shipping acceptance testing.
Test and commissioning engineers performing in‑house or on‑site stability assessments.
Mechanical and control engineers specifying robustness margins in contracts and maintenance procedures. Practical uses:
Contractual acceptance criteria for AMB‑equipped rotating machinery
Commissioning checklists and performance reports
Diagnostic baseline for maintenance and troubleshooting of AMB control loops

Related Standards

ISO 14839-1: Vocabulary (part of the same series)
ISO 14839-2: Evaluation of vibration (related AMB vibration assessment)
ISO 10814: Regulation of resonance vibration and Q‑factor requirements during run‑up and critical speed passage

Keywords: ISO 14839-3, active magnetic bearings, AMB, stability margin, Nyquist plot, sensitivity function, gain margin, phase margin, rotating machinery, vibration standards.

ISO 14839-3:2006 PDF

Technical details

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

Abstract

Overview

Key Topics

Applications

Related Standards

Related standards

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