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GB/T 34887-2017 English PDF

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US$339.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 34887-2017: Hydraulic fluid power -- Test code for the determination of noise level of hydraulic motors
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 34887-2017	339	Add to Cart	4 days	Hydraulic fluid power -- Test code for the determination of noise level of hydraulic motors	Valid

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Basic data

Standard ID: GB/T 34887-2017 (GB/T34887-2017)
Description (Translated English): Hydraulic fluid power -- Test code for the determination of noise level of hydraulic motors
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J20
Classification of International Standard: 23.100.10
Word Count Estimation: 17,156
Date of Issue: 2017-11-01
Date of Implementation: 2018-05-01
Regulation (derived from): National Standard Announcement 2017 No. 29
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

GB/T 34887-2017: Hydraulic fluid power -- Test code for the determination of noise level of hydraulic motors

---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.
Hydraulic fluid power-Test code for the determination of noise level of hydraulic motors ICS 23.100.10 J20 National Standards of People's Republic of China Hydraulic transmission motor noise measurement specification hydraulicmotors (ISO 4412-2.1991, Hydraulicfluidpower-Testcodefordeterminationof airbornenoiselevels-Part 2.Motors, MOD) Posted.2017-11-01 2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Preface Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Measurement uncertainty 2 5 test environment 2 6 measuring instruments 2 7 motor installation conditions 3 8 operating conditions 3 9 noise measurement point location and the number of points 4 10 Determination procedures 4 11 record information 5 12 test report 6 13 Marking instructions 6 Appendix A (informative) Technical differences and causes 7 Appendix B (Normative) Accuracy of measuring instruments and system error 9 Appendix C (Normative) Noise measurement point location and measuring points 10 Appendix D (Normative) Background noise sound pressure level correction value 12 Appendix E (Normative) Sound pressure level and sound power level calculation 13

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard uses redrafted Law Amendment uses ISO 4412-2.1991 "hydraulic transmission test airborne noise level test rules Fan Part 2. Motor "(in English). This standard compared with ISO 4412-2.1991 there are technical differences, Appendix A gives the corresponding technical differences and their causes Table. This standard is proposed by the China Machinery Industry Federation. This standard by the National Hydraulic Pneumatic Standardization Technical Committee (SAC/TC3) centralized. This standard is drafted by. Guangzhou Mechanical Science Research Institute Co., Ltd., Fuzhou University. Participated in the drafting of this standard. Hydraulic Co., Ltd. in the hydraulic source, Heyuan Changyuan Hydraulic Co., Ltd., Zhejiang University, Sikes Hydraulic Technology Co., Ltd., too heavy group Yuci Hydraulic Industrial Co., Ltd., Beijing Huade Hydraulic Industrial Group Co., Ltd., Sichuan Yangtze Hydraulic Co., Ltd., Shandong Zhongchuan Hydraulic Co., Ltd. The main drafters of this standard. Min Xin and, Chen Shumei, Wang Chih-Jun, Xie Hui, Shen Wanhua, Xu Bing, Chen Wenhui, Huang Hui, He Wenjie, Liang Yong, Cao Jie, Cui Jinghai, Zhang Liping, Lv Shuping, Jiao Ling, Dai Yuanlong, Yu Xingquan, Qing-Xiang Liu, Liu Jun. Hydraulic transmission motor noise measurement specification

1 Scope

This standard specifies the specifications for the airborne noise level measurement of hydraulic motors (hereinafter referred to as motors) operating under steady-state conditions. This standard applies to the A-weighted sound power level measurement motor, motor frequency band (center frequency from 125Hz ~ 8000Hz) sound power Rate level. This standard does not apply to the working speed is less than 50r/min, motor reference rectangular hexahedron size larger than 1m motor, its His form of hydraulic motor can also be used for reference.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 3141 industrial liquid lubricants ISO viscosity classification (GB/T 3141-1994, eqvISO 3448.1992) GB/T 3241 electroacoustic octave and fractional octave filter (GB/T 3241-2010, IEC 61260.1995, MOD) GB/T 3767 Acoustics sound pressure method for the determination of noise source sound power level and acoustic energy level above the free surface of the reflecting surface above the engineering method GB/T 3785.1 Electroacoustic sound level meter Part 1. Specification (GB/T 3785.1-2010, IEC 61672-1.2002, IDT) GB/T 3785.2 electroacoustic sound level meter Part 2. Type evaluation test (GB/T 3785.2-2010, IEC 61672-2. 2003, IDT) GB/T 3947 Acoustics terminology GB/T 6882 Acoustics sound pressure method for the determination of noise source sound power level and sound energy level anechoic chamber and semi-anechoic chamber precision method GB/T 7631.2 Lubricants, industrial oils and related products (Category L) classification - Part 2 H group (hydraulic system) (GB/T 7631.2-2003, ISO 6743-4.1999, IDT) GB/T 17483 hydraulic pump air noise level sounding specification (GB/T 17483-1998, eqvISO 4412-1.1991)

3 Terms and definitions

GB/T 3767 and GB/T 3947 as defined by the following terms and definitions apply to this document. 3.1 Freefield freesoundfield In homogeneous isotropic media, the boundary affects sound fields that can be ignored. [GB/T 3947-1996, Definition 4.57] Note that in practice this is a sound field with negligible boundary effects in the 125 Hz to 8000 Hz frequency range. 3.2 Reflective surface free field above freefieldoverareflectingplane Sound field in an isotropic, homogeneous medium in an infinite, hard, flat surface above half-space. Note The sound source under test is on this surface. 3.3 Anechoicroom The boundary effectively absorbs all the incident sound so that it is essentially a free-field room. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 34887-2017_English be delivered?

Answer: Upon your order, we will start to translate GB/T 34887-2017_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 34887-2017_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 34887-2017_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.