GOST ISO 1940-1-2007 PDF

Full title and description

Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state — Part 1: Specification and verification of balance tolerances. This document is the Russian national adoption designated GOST ISO 1940-1-2007 and is an identical adoption of ISO 1940-1:2003, giving requirements and tolerance classes for residual unbalance of rigid rotors used in machinery and engineering applications.

Abstract

GOST ISO 1940-1-2007 specifies how to express permissible residual unbalance for rigid rotors, the representation of unbalance (one- or two-plane), the necessary number of correction planes, and procedures for verification of residual unbalance after balancing. It provides the balance quality grades (G‑grades) and practical guidance to relate mass, rotational speed and allowable specific unbalance for acceptance and quality control of rotors. The standard does not cover rotors that behave flexibly in service.

General information

• Status: National adoption (GOST) — identical adoption of ISO 1940-1:2003; historically part of the ISO/TC 108 work on mechanical vibration and balancing.
• Publication date: GOST designation year 2007; published as a GOST national publication 1 July 2008 (GOST ISO 1940-1-2007).
• Publisher: Standards of the Russian Federation (GOST national adoption); commonly distributed through Interstandard and recognized standards distributors.
• ICS / categories: 21.120.40 — Balancing and balancing machines (mechanical vibration / rotor balancing).
• Edition / version: GOST ISO 1940-1-2007 (national adoption of ISO 1940-1:2003).
• Number of pages: GOST edition: 27 pages (ISO 1940-1:2003 is commonly listed as 28 pages depending on publisher edition).

Key bibliographic details above are drawn from national GOST listings and the ISO adoption record for ISO 1940-1:2003.

Scope

The standard applies to rotors that behave as rigid bodies in service (i.e., the mass distribution does not change significantly with speed). It defines balance quality grades, methods for expressing permissible residual unbalance (static, couple and dynamic representations), determination of the number and position of correction planes, and verification procedures for residual unbalance. It explicitly excludes flexible rotors (covered by other standards such as ISO 11342 and later rotor-balancing standards) and does not address aerodynamic/hydrodynamic forces unrelated to mass distribution.

Key topics and requirements

• Definition and classification of rotor behaviour (rigid vs flexible) and representation of unbalance (one- or two-plane models).
• Balance quality grades (G‑grades) and formulas to convert between permissible residual unbalance, rotor mass and service rotational speed.
• Specification of permissible residual unbalance in terms of specific unbalance (e) or residual unbalance per unit mass (in mm/s or g·mm/kg units depending on convention).
• Guidance on selecting number of correction planes and on allocation of correction masses.
• Verification methods and measurement considerations, and treatment of measurement errors and uncertainty associated with balancing and verification.
• Recommendations for acceptance criteria and communication between manufacturer and user regarding permitted unbalance tolerances.

Typical use and users

Used by designers, manufacturers and quality/inspection teams of rotating machinery (motors, pumps, fans, gearboxes, turbines, machine-tool spindles), balancing and vibration testing laboratories, maintenance and reliability engineers, and procurement/specification authors who need to set or verify balance tolerances for rotors that behave rigidly in service.

Related standards

ISO 1940-1:2003 (identical text), ISO 1940-2 (balance errors and related topics), ISO 11342 (balance quality for flexible rotors), and later/replacement rotor-balancing standards such as ISO 21940-11 (procedures and tolerances for rotors with rigid behaviour) which superseded ISO 1940-1 in the ISO system. National GOST references may also note superseded older GOST numbers (for example GOST 22061).

Keywords

balance quality, rotor balancing, rigid rotor, unbalance tolerances, G‑grade, residual unbalance, balancing planes, mechanical vibration, verification, acceptance criteria.

FAQ

Q: What is this standard?

A: GOST ISO 1940-1-2007 is the Russian national adoption of ISO 1940-1:2003, specifying balance quality requirements and verification procedures for rotors that behave as rigid bodies in service.

Q: What does it cover?

A: It covers representation of unbalance (one- and two-plane), permissible residual unbalance expressed as balance quality grades (G‑grades), selection of correction planes, and verification/testing methods for residual unbalance. It excludes flexible rotors and system-resonance effects.

Q: Who typically uses it?

A: Manufacturers of rotating equipment, balancing workshops and test labs, maintenance and reliability engineers, and specification writers who set acceptance tolerances for rotor balance.

Q: Is it current or superseded?

A: GOST ISO 1940-1-2007 is the national adoption corresponding to ISO 1940-1:2003. Within the ISO catalogue ISO 1940-1:2003 has been superseded by later rotor-balancing work (notably ISO 21940-11:2016 in the ISO series), so for the very latest international procedures and consolidated guidance users should also consult ISO 21940-11 and national update records. Whether the GOST text remains the actively enforced national document depends on current Russian national standardization updates — check the national standards registry for the latest legal status.

Q: Is it part of a series?

A: Yes — it is Part 1 of the ISO 1940 series addressing rigid-rotor balance quality; Part 2 and related documents address balance errors and measurement issues, and subsequent ISO work (ISO 21940 series) expands rotor-balancing procedures and tolerances.

Q: What are the key keywords?

A: Rigid rotor, balance quality, G‑grade, residual unbalance, balancing planes, verification, mechanical vibration, rotor balancing.