|
US$379.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 34877.3-2017: Industrial fans -- Determination of fan sound power levels under standardized laboratory conditions -- Part 3: Enveloping surface methods
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 34877.3-2017 | English | 379 |
Add to Cart
|
3 days [Need to translate]
|
Industrial fans -- Determination of fan sound power levels under standardized laboratory conditions -- Part 3: Enveloping surface methods
| Valid |
GB/T 34877.3-2017
|
PDF similar to GB/T 34877.3-2017
Basic data | Standard ID | GB/T 34877.3-2017 (GB/T34877.3-2017) | | Description (Translated English) | Industrial fans -- Determination of fan sound power levels under standardized laboratory conditions -- Part 3: Enveloping surface methods | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J72 | | Classification of International Standard | 23.120 | | Word Count Estimation | 19,125 | | 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 34877.3-2017: Industrial fans -- Determination of fan sound power levels under standardized laboratory conditions -- Part 3: Enveloping surface methods
---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.
Industrial fans-Determination of fan sound power levels under standardized laboratory conditions-Part 3. Enveloping surface methods
ICS 23.120
J72
National Standards of People's Republic of China
Industrial fan standard laboratory conditions fan
Determination of sound power level - Part 3. Envelope method
laboratoryconditions-Part 3.Envelopingsurfacemethods
(ISO 13347-3.2004, IDT)
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
Foreword Ⅲ
1 Scope 1
2 Normative references 1
Acoustic environment and pipe connections 1
4 Determination of the measuring surface 4
5 test methods 13
Acoustical tests - Determination of sound power levels
Appendix A (Normative) Determination of environmental correction factor K2
References 16
Foreword
GB/T 34877 "Determination of fan sound power level of industrial fan standard laboratory conditions" has included or will include the following four sections.
--- Part 1. General overview;
--- Part 2. Reverberation chamber method;
--- Part 3. Envelope method;
--- Part 4. Sound intensity method.
This section GB/T 34877 Part 3.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This section uses the translation method is equivalent to using ISO 13347-3.2004 "industrial fan standard laboratory fan power level under the test
Set Part 3. Envelopment Law. "
The documents of our country that are consistent with the corresponding international documents that are normative references in this section are as follows.
--- GB/T 3767-2016 Acoustic sound pressure method for the determination of sound power level and acoustic energy level above the free surface reflection surface above
Engineering Act (ISO 3744.2010, IDT);
--- GB/T 17697-2014 Acoustic fans and other ventilation equipment radiated into the pipe sound power pipe method
(ISO 5136.2003, IDT);
--- GB/T 21231-2007 small acoustic ventilation devices - Measurement of radiated airborne noise (ISO 10302.1996,
IDT);
Industrial ventilators vocabulary and type definition (ISO 13349.1999, IDT).
For ease of use, this section made the following editorial changes.
a) Added 6.1.3 Measurement uncertainty;
b) replaced 6 of the 4.3 figures;
c) delete the preamble and introduction in the original standard;
d) The definition and description of the physical quantities in this section are given in ISO 13347-1, for the purpose added in 4.4.2 from ISO 13347-1
Of the equivalent diameter of pipe De annotation, increase in S0, ρ and c in 6.1.2 comments, in order to facilitate the use of this standard.
This part is proposed by China Machinery Industry Federation.
This part of the National Fan Standardization Technical Committee (SAC/TC187) centralized.
This part of the drafting unit. Shenyang Blower Institute (Limited), Zhejiang Golden Shield Fan Co., Ltd. Zhejiang fan quality
Quantity Inspection Center, Zhejiang Shangfengkefengfeng Industrial Co., Ltd.
The main drafters of this section. Zheng Hua, Luo Jianping, Yu Peiquan, Xu Baohua, Li Xiaodong, Xu Honghai.
Industrial fan standard laboratory conditions fan
Determination of sound power level - Part 3. Envelope method
1 Scope
This part of GB/T 34877 applies to the industrial fan as defined in GB/T 1236 and ISO 13349, limited to a particular device is empty
Measurement of gas-sound transmission, neither measure the vibration nor measure the vibration effect caused by air-sound transmission sensitivity.
The size of the ventilator to be tested in accordance with this standard is limited only by the actual conditions of the test equipment. Test ventilator for room ruler
Dimensions, power and installation requirements are subject to size constraints, test ventilator size and aerodynamic performance. (Small fan can be according to this section or according to
Use according to the provisions of ISO 10302 test).
The test setup in this section establishes the laboratory conditions necessary for a successful test, and few of these conditions are met in the field
Pieces, and this part is not used for on-site measurement. Remind users who want to use this part of the site for measurements in the field. In these cases, the fan inlet
And the exit conditions are not ideal, there may be additional acoustic system effects.
The enveloping surface method may be used to deal with the sound input power and/or open sound output of the fan of the standardized installation type listed in 3.1
Rate level was measured.
For smaller turbines, or for pipe measurements as specified in ISO 5136, it is not advisable to adopt end-point correction methods (see
ISO 13347-1.2004 Appendix C) can also get the fan duct sound power level estimation (uncertainty will increase).
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 1236-2000 Industrial Ventilators for Performance Test with Standard Duct (ISO 5801.1997, IDT)
ISO 3744 Acoustics - Determination of the approximate free field above the acoustic power reflection surface by acoustic pressure method Acoustics-
Determinationofsoundpowerlevelsofnoisesourcesusingsoundpressure-Engineeringmethodinan
essentialyfreefieldoverareflectingplane)
ISO 5136 Acoustic fans and other ventilators radiating sound into pipes Piping methods (Acoustics-Determi-
nationofsoundpowerradiatedintoaductbyfansandotherair-movingdevices-In-ductmethod)
ISO 10302 Acoustics-Method for measurement of radiated air noise in small ventilated installations (Acoustics-Methodforthemeasure-
mentofairbornenoiseomittedbysmalair-movingdevices)
Industrial ventilators - Determination of ventilator sound power levels under standardized laboratory conditions - Part 1. ISO 13347-1-2004.
General review (Industrialfans-Determinationoffansoundpowerlevelsunderstandardizedlaboratory
conditions-Part 1.Generaloverview)
ISO 13349 Industrial Fan Vocabulary and Category Definition (Industrialfans-Vocabularyanddefinitionsofcate-
gories
3 Acoustic environment and plumbing
3.1 Overview
Ventilator installation conditions should be consistent with the provisions of GB/T 1236 4 types of devices.
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 34877.3-2017_English be delivered?Answer: Upon your order, we will start to translate GB/T 34877.3-2017_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of GB/T 34877.3-2017_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 34877.3-2017_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+ countriesQuestion 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 [email protected]. 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.
|