GB/T 6557-2009 English PDFGB/T 6557: Historical versions
Basic dataStandard ID: GB/T 6557-2009 (GB/T6557-2009)Description (Translated English): Mechanical vibration -- Methods and criteria for the mechanical balancing of flexible rotors Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J04 Classification of International Standard: 21.120.40 Word Count Estimation: 36,384 Date of Issue: 2009-04-24 Date of Implementation: 2009-12-01 Older Standard (superseded by this standard): GB/T 6557-1999 Quoted Standard: GB/T 6444; GB/T 9239.1; GB/T 9239.2; GB/T 16908; ISO 2041 Adopted Standard: ISO 11342-1998/Cor 1-2000, IDT Regulation (derived from): National Standard Approval Announcement 2009 No.6 (Total No.146) Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China Summary: This standard specifies the classification of various types of rotor, cited a variety of typical structural type of flexible rotors, illustrate the balanced approach. Specifies the evaluation method and the final state of imbalance gives guidelines by vibration limits and residual unbalance the equilibrium and balance on the spot assessment of the balance device limit. This standard is also used as a basis for more in-depth research. For example, when a more accurate determination of the quality required for the balance, if the method for producing a predetermined unbalance limit value, and paying attention, can be expected to operate satisfactorily. This standard is not acceptance of the rotor. But it shows how to avoid defects and unnecessary restrictions. This standard methods and guidelines given by the experience obtained general industrial machinery for general industrial machinery. For special equipment or special circumstances, they may not be directly applicable, some situations may require deviation from this standard. Structural resonances and dynamic modification of the problem is not included within the scope of this standard. GB/T 6557-2009: Mechanical vibration -- Methods and criteria for the mechanical balancing of flexible rotors---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Mechanical vibration.Methods and criteria for the mechanical balancing of flexible rotors ICS 21.120.40 J04 National Standards of People's Republic of China Replacing GB/T 6557-1999 Flexible rotor balancing mechanical methods and guidelines (ISO 11342.1998/Cor.1.2000, IDT) Posted 2009-04-24 2009-12-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released Table of ContentsIntroduction Ⅲ Introduction Ⅳ 1 Scope 1 2 Normative references 1 3 Terms and definitions 4 based flexible rotor dynamics and balance of 1 5 rotor structure type 4 6 low-speed flexible rotor balancing method 7 7 high-speed flexible rotor balancing method 8 8 Assessment Guideline 11 14 9 Evaluation Method Appendix A (informative) Notes on the scene of the rotor 17 Annex B (informative) best plane balance --- low speed balance on three sides 18 Annex C (informative) Conversion factor 19 Annex D (informative) calculation of equivalent type suffer residual unbalance example 20 Appendix E (normative) to determine the rotor is rigid or flexible approach 23 Annex F (informative) Equivalent modal unbalance allowable calculation example (see 8.3.3.2) 25 Annex G (informative) imbalance correction calculation method 26 Appendix H (Informative Appendix) GB/T 6444-1995 definition of the term flexible rotor 27 References 29ForewordThis standard is identical with ISO 11342.1998 "Mechanical balancing methods and guidelines for mechanical vibrations of the flexible rotor" (in English) and supplementary Member ISO 11342.1998/Cor. 1.2000. This standard is equivalent to translate ISO 11342.1998, the standard structure and technical content with their full agreement. For ease of use, this standard with the international standard, made the following editorial changes. --- Delete 11342.1998 foreword, preface rewritten this standard; --- The "this International Standard" be replaced by "this standard"; --- Use the decimal symbol. "" Instead of English as a decimal comma "." This standard replaces GB/T 6557-1999 "mechanical equilibrium methods and guidelines for mechanical vibrations of flexible rotors." This standard and GB/T 6557-1999 compared to the main changes are as follows. --- Remove the GB/T in 6557-1999 in 8.3.3.1 c) and 8.3.3.2 of d) terms. --- Revised Appendix D. 1 contents deleted D. Note 1 content 1. --- Revised Appendix D. 1 in Table D. 1 and Table D. 4 data. The Standard Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F, Annex G and Annex H is informative appendix. This standard by the national mechanical vibration, shock and condition monitoring Standardization Technical Committee (SAC/TC53) and focal points. This standard was drafted. Zhengzhou Machinery Research Institute. The main drafters of this standard. Huangrun Hua, Han Guoming. Standard standard replaces the previous editions are. --- GB/T 6557-1986, GB/T 6557-1999; --- GB/T 6558-1986.IntroductionPurpose is to balance the rotor can operate satisfactorily when mounted after it in the field. Here, the "satisfactory running" means that the rotor is not surplus Vibration caused by the balance of not more than one of the allowed vibration amplitude. For the flexible rotor means at any speed up to the maximum operating speed of rotation Sub deflection produced no more than a certain allowable value. Most rotor assembly before the machine is balanced at the factory, because after the machine assembly, generally only a restricted approaching turn child. In addition, users usually do rotor balancing rotor acceptance stage. Thus, although the aim is to balance the machine can run satisfactorily on site OK, but it is usually balanced rotor balancing equipment for initial quality assessment. In most cases, run satisfactorily on-site is by the Various causes vibration to be assessed, but the main consideration in the balancing device the same frequency vibration. Accordance with the standards of the rotor of the rotor balancing requirements classification, and to develop a method for assessing the remaining imbalance. This standard also illustrates how to have been assembled and installed machine vibration limits prescribed, or from the rotor unbalance limit specified Export guidelines for balancing equipment. If there is no such limit applied, this standard describes how to export these limits from the following criteria. If you want to use the vibration limits by GB /Export (standard series) T 11348, if you want to use to allow residual imbalance limits may be GB/T 9239.1 Export. GB/T 9239.1 and balance quality of rigid body rotation, whereas the flexible rotor can not be directly used as a flexible Rotor may have a significant deflection. Proposed method GB/T 9239.1 Guidelines for Flexible Rotor in this standard 8.3. As the standard in many details with the GB/T 9239.1 complement each other, they recommended that the application should be considered together. Sometimes a balanced rotor qualified in the field due to the support structure resonance vibration failure. Damping small structures in or near the resonance Under resonance conditions small imbalance can cause excessive vibration response, in this case, the more practical approach is to change the structure of the natural frequency Or damping rate, rather than to achieve a very low balance, may be difficult to maintain long-term level (see GB/T 19874-2005). Flexible rotor balancing mechanical methods and guidelines1 ScopeThis standard feature in accordance with the rotor and rotor balancing requirements for various types of classification, citing a variety of typical flexible rotor structure type, indicating the level Balance method, according to the provisions of the unbalanced vibration limit evaluation method and the final state is given in the balance on the balance and equilibrium and on-site equipment Guidelines residual unbalance limit assessment. This standard is also used as the basis for more in-depth research. For example, when you need more precise determination of the quality of the balance required, if the provisions of Manufacturing methods and paying attention to unbalance limit is expected to be able to operate satisfactorily. Acceptance of this standard is not the rotor, but it shows how to avoid large defects and unnecessary restrictions. Methods and guidelines given in this standard are empirically obtained general industrial machinery for general industrial machinery. For special set Equipment or special circumstances, they may not be directly applicable, some situations may require deviation from the provisions of this standard. Structural resonances and dynamic modification issues not included in the scope of this standard.2 Normative referencesThe following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 6444 Mechanical vibration - Balancing vocabulary (GB/T 6444-2008, ISO 1925.2001, IDT) GB/T 9239.1 Mechanical vibration steady state (rigid) rotor balance quality requirements - Part 1. Specification and balance tolerance test (GB/T 9239.1-2006, ISO 1940-1.2003/Cor.1.2005, IDT) GB/T 9239.2 Mechanical vibration steady state (rigid) rotor balance quality requirements - Part 2. Balance errors (GB/T 9239.2- 2006, ISO 1940-2.1997, IDT) GB/T 16908 Mechanical vibration Shaft and fitment key balance guidelines (GB/T 16908-1997, ISO 8821. 1989, IDT) ISO 2041 Mechanical vibration and shock term3 Terms and DefinitionsISO 2041 and GB/T 6444 in terms and definitions apply to this standard. Note. GB/T 6444 in terms of the definition of a flexible rotor are given in Appendix H, as a reference.4 based flexible rotor dynamics and balance4.1 General Flexible rotor generally require multi-faceted balancing high speed, however, and in some cases flexible rotor can be balanced at low speed. For high-speed Balance, to achieve a satisfactory balance has proposed two basic ways, called modal balancing method and influence coefficient method. Both methods The advantages and disadvantages of the basic theory has been widely discussed in many literatures. Thus, not described in greater detail herein. In most practical Balancing applications, commonly used method is a combination or other balancing these two methods, which are often incorporated into the computer package. 4.2 unbalanced distribution Rotor design and manufacturing methods can significantly affect the amount of unbalance size distribution along the rotor axis. It may be provided by a single rotor forgings Machined, or assembled from several parts together. For example, by a plurality of jet engine rotor housing, roulette and blade components linked structure ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 6557-2009_English be delivered?Answer: Upon your order, we will start to translate GB/T 6557-2009_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 6557-2009_English with my colleagues?Answer: Yes. 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