GB/T 20062-2017 (GB/T20062-2017, GBT 20062-2017, GBT20062-2017) & related versions
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Mobile cranes -- Limits and measurement methods for operating noise
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[GB/T 20062-2006] Mobile crawler crane -- Limits and measurement methods for operating noise
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GB/T 20062-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 53.020.20
J 80
Replacing GB/T 20062-2006
Mobile Cranes - Limits and Measurement Methods for
Operating Noise
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 1, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Limits for Noise ... 5
5 Measurement Methods ... 5
6 Information of Record ... 10
7 Information of Report ... 11
Appendix A (informative) Noise Measurement Report ... 13
Bibliography ... 16
Mobile Cranes - Limits and Measurement Methods for
Operating Noise
1 Scope
This Standard specifies the limits for external radiated noise, and the limits and
measurement methods for noise in operator’s cabin of mobile cranes.
This Standard is applicable to the mobile cranes defined in GB/T 6974.2 (hereinafter
referred to as “cranes”).
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 3767 Acoustics - Determination of Sound Power Levels and Sound Energy
Levels of Noise Sources Using Sound Pressure - Engineering Methods for an
Essentially Free Field over a Reflecting Plane
GB/T 3785.1-2010 Electroacoustics - Sound Level Meters - Part 1: Specifications
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement
of Limiting Values
GB/T 17248.2 Acoustics - Noise Emitted by Machinery and Equipment - Determination
of Emission Sound Pressure Levels at a Work Station and at Other Specified Positions
in an Essentially Free Field over a Reflecting Plane with Negligible Environmental
Corrections
GB/T 21457 Cranes and Related Equipment - Accuracy Requirements for Measuring
Parameters during Testing
3 Terms and Definitions
The following terms and definitions are applicable to this Standard.
3.1 Time-averaged A-weighted Sound Pressure Level
LpA,T
5.1.1 The instrument system for data collection shall preferentially select an integral
average sound level meter that complies with the requirements of Level-I in 5.1.5 of
GB/T 3785.1-2010.
5.1.2 The measuring instrument shall be periodically verified in accordance with the
stipulations of the relevant measuring instruments and respectively calibrated before
and after the measurement.
5.1.3 During the measurement, A frequency weighting character and S time weighting
character shall be used.
5.1.4 During the measurement, records shall be kept. If obvious noise peaks appear,
they shall be recorded.
5.2 Measurement Environment
5.2.1 The test site shall comply with the stipulations of GB/T 3767.
5.2.2 At the microphone position, the averaged background noise level should be lower
than the measured sound pressure level by more than 15 dB, and at least 6 dB lower.
5.2.3 The ambient temperature during the test is between -10 °C ~ + 35 °C.
5.2.4 During the test, the wind speed 1.5 m from the ground shall not be greater than
8 m/s.
5.2.5 During the test, if the wind speed exceeds the maximum allowable wind speed
range provided by the microphone manufacturer, a windproof device shall be added to
the microphone.
5.3 Positioning of Crane Noise Measurement Center
The noise measurement surface of the crane is a hemispherical surface (see Figure
1), with a radius of 16 m. If the crane is not suitable for this radius, it may also be
selected in accordance with GB/T 3767.
For cranes equipped with two engines, then, the crane noise measurement center is
the geometric center of the engine used for lifting operations and shall coincide with
the center of the hemisphere. During the measurement, the driving direction of the
crane is along the + X direction; the boom is along the - X direction. If the crane driving
direction is consistent with the working direction of the boom (for cranes without
rotating function), then, the crane (whole body) is along the - X direction.
For cranes equipped with one engine, which is simultaneously provided for driving and
operation, then, the crane noise measurement center is the middle position of the
engine and the hoisting machine and shall coincide with the center of the hemisphere.
5.4 Layout of Microphone
The measurement state of the cranes shall comply with the following stipulations:
a) Before measurement, in accordance with the operating manual provided by
the manufacturer, pre-heat the crane’s engine and hydraulic system to the
temperature of normal use; in accordance with the operating manual, perform
all safety-related procedures;
b) For cranes equipped with two engines, then, only the engine for lifting
operations is used; the engine for driving is turned off;
c) For cranes whose engine is equipped with an exhaust device, during the test,
the device shall be turned on. If the exhaust device has multiple speeds, then,
the measurement shall be performed when the exhaust device is running at
the highest speed;
d) During the measurement, the engine speed is 75% ± 2% of the rated speed;
e) Under the circumstance where heavy objects and hooks will not generate
dangerous movements, operate at the maximum acceleration and
deceleration;
f) Under the working conditions determined in 5.6.2 ~ 5.6.5, operate at the
maximum lifting, turning, luffing and telescopic speeds provided in the
instruction manual.
5.6.2 Working conditions of lifting
The crane lifts 50% of the rated weighted; select an appropriate boom length; the
measurement duration is 15 s ~ 20 s.
5.6.3 Working conditions of turning
When the crane is unloaded and has the shortest basic boom, adjust the boom to the
position at 40° ~ 50° with the horizontal plane; rotate by 90° to the left; immediately
reversely rotate to the initial position. The measurement time is the time required for
one work cycle.
5.6.4 Working conditions of luffing
When the crane is unloaded and has the shortest basic boom, lift the boom from the
maximum working range to the minimum working range, and immediately descend to
the initial position. The measurement time is at least 20 s.
5.6.5 Telescopic working conditions of boom
When the crane is unloaded, adjust the fully retracted boom to a position at 40° ~ 50°
with the horizontal plane; fully extend the first grade of the telescopic cylinder, then,
immediately return to the fully retracted state. The measurement time shall be the time
NOTE 1: if the reflective surface of the measurement site is a hard and flat ground (for
example, asphalt or concrete ground), then, when there is no reflector within 3
times the radius of the measured hemisphere from the sound source, and the
absolute value of the environmental correction value K2A is less than or equal to
0.5 dB, then, K2A equals to 0 dB.
NOTE 2: for sand and gravel ground, when K2A is greater than 0.5 dB, the environmental
correction value is included in the calculation of sound power.
S---the area of the hemisphere measurement plane, expressed in (m2);
S0---constant, S0 = 1 m2;
---constant value of sound power level. When the hemisphere radius is 4 m,
take 20.0 dB; when the hemisphere radius is 10 m, take 28.0 dB; when the hemisphere
radius is 16 m, take 32.1 dB.
5.8 Determination of Measurement Results
5.8.1 All intermediate calculation results (such as: sound pressure level and area
calculation, etc.) shall retain one decimal place. The measurement accuracy of the
parameters in the tests shall comply with the stipulations of GB/T 21457.
5.8.2 When the difference between two of the three A-weighted measurement values
does not exceed 1 dB, no measurement is necessary. Otherwise, the measurement
shall be continued, until the difference between two values does not exceed 1 dB. Use
the arithmetic mean value of the two higher values that differ by no more than 1 dB as
the report value.
6 Information of Record
6.1 The information of the test prototype shall include:
---Prototype manufacturer;
---Prototype model;
---Prototype No.;
---Engine manufacturer;
---Engine model;
---Net power of engine;
---Maximum rated speed of engine;
......
GB 20062-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 53.020.30
J 80
Mobile crawler crane - Limits and measurement
methods for operating noise
ISSUED ON: JANUARY 24, 2006
IMPLEMENTED ON: AUGUST 01, 2006
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Replaced
From March 23, 2017, this standard was changed into recommended
standard; its number was changed to GB/T 20062-2006.
According to the Announcement of the PRC on Standard (No.7 of 2017)
AND the integration & simplification conclusions of compulsory standard,
this standard was changed into recommended standard from March 23,
2017, which will not be compulsorily implemented.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Noise limit ... 4
5 Measurement method ... 5
Appendix A (Normative) Measurement methods for crane's operating noise ... 6
Appendix B (Informative) Measurement record sheet of operating noise of
crane AND noise of on-board operating cab ... 10
Mobile crawler crane - Limits and measurement
methods for operating noise
1 Scope
This standard specifies the limits and measurement methods for operating
noise of mobile crawler cranes (wheel crane, auto-crane, crawler cranes).
This standard applies to mobile crawler cranes, which have engine rated power
of not greater than 350 kW (hereinafter referred to as cranes).
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB 3785-1983 Electric, sonic properties and measuring methods for sound
level meters
JB/T 3301-1983 Auto-crane and wheel crane - Terminology
3 Terms and definitions
The terms and definitions as established by JB/T 3301, as well as the following
terms and definitions, apply to this standard.
3.1
Environment noise
Environment noise refers to the noise of the surrounding environment
(including wind noise), when the measured crane noise does not exist.
4 Noise limit
When the crane is in operation, the radiated noise's sound power level LW(A)
Appendix A
(Normative)
Measurement methods for crane's operating noise
A.1 Measurement environment
A.1.1 The test site shall be a solid ground. There shall be no large reflectors,
within the range 3 times the distance, from the center of the crane chassis to
the measurement point. The environment noise is 6 dB(A) ~ 10 dB(A) lower
than the measurement noise. The measurement results shall minus the
correction value in Table A.1. If the difference is less than 6 dB(A), the
measurement result is invalid.
A.1.2 The wind speed at the test site shall be less than 5 m/s. When the wind
speed exceeds 2 m/s, the sound level meter shall use a wind shield.
A.1.3 The ambient temperature, during the test, is generally between -5 °C and
+35 °C.
A.2 Measuring instruments
A.2.1 The sound level meter or other equivalent measuring system, which is
used for measurement, shall not be lower than the requirements of the Type I
sound level meter, which is specified in GB 3785-1983. The "A" frequency
weighting characteristics and "S" time weighting characteristics shall be used
for measurement.
A.2.2 Speed measurement
Use a tachometer, which has an accuracy better than ±2%, to monitor the oil
pump speed or engine speed.
A.2.3 Measurement of meteorological parameter
The accuracy of the thermometer shall be within ±0.1 °C. The accuracy of the
anemometer shall be within ±1%.
A.2.4 All measuring instruments shall be inspected regularly, in accordance with
S - The area of the measuring surface, in square meters (m2);
S0 = 1 m2;
The value of 10 lgS/S0 is found from Table A.3.
Table A.3 -- Relationship between 10 lgS/S0 and R
A.4.1.4 The number of measurements: 3 times in each working condition.
A.4.1.5 Determination of measurement results
The difference between the three measurements, in each working condition,
shall not be more than 2 dB(A). When not satisfied, additional tests are required.
Calculate the arithmetic average value, as the reported value of the A-weighted
sound power level value. The A-weighted sound power level value of each
working condition shall not exceed the limit specified in Table 1.
A.4.2 Determination of noise in the on-board operating cab
A.4.2.1 All doors and windows of the operating cab are closed, during
measurement. The measurement conditions are the same as those in A.3.
A.4.2.2 Measuring position is usually arranged near the ears of the
measurement point [(750 ± 10) mm above seat's upper surface, (200 ± 50) mm
from the center line of the seat]; the microphone faces forward.
A.4.2.3 The sound level meter shall be placed in A weighted at slow gear.
A.4.2.4 The number of measurements: 3 times in each working condition.
A.4.2.5 Determination of measurement results
The difference between the three measurements, in each working condition,
shall not be more than 2 dB(A). When not satisfied, additional tests are required.
Calculate the arithmetic average value. Use it as the reported value of the noise
value in the on-board operating cab. The noise value in the on-board operating
cab, under each working condition, shall not exceed the limit specified in Table
1.
......
| Standard ID | GB/T 20062-2017 (GB/T20062-2017) | | Description (Translated English) | Mobile cranes -- Limits and measurement methods for operating noise | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J80 | | Classification of International Standard | 53.020.20 | | Word Count Estimation | 14,184 | | Date of Issue | 2017-12-29 | | Date of Implementation | 2018-07-01 | | Drafting Organization | National Construction Machinery Quality Supervision and Inspection Center, Zoomlion | | Administrative Organization | National Lifting Machinery Standardization Technical Committee (SAC/TC 227) | | Proposing organization | China Machinery Industry Federation | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, China National Standardization Administration | | Standard ID | GB 20062-2006 (GB20062-2006) | | Description (Translated English) | [GB/T 20062-2006] Mobile crawler crane. Limits and measurement methods for operating noise | | Sector / Industry | National Standard | | Classification of Chinese Standard | J80 | | Classification of International Standard | 53.020.20 | | Word Count Estimation | 8,856 | | Date of Issue | 2006-01-24 | | Date of Implementation | 2006-08-01 | | Quoted Standard | GB/T 3785-1983; JB/T 3301-1983 | | Drafting Organization | National Construction Machinery Quality Supervision and Inspection Center | | Administrative Organization | Lifting National Standardization Technical Committee | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 2, 2006 (No. 89 overall) | | Proposing organization | China Machinery Industry Federation | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This Chinese standard provides mobile cranes (tires, car and crawler cranes) operating noise limits and measurement methods. This standard applies to disabilities rated engine power less than 350 kW of moving cranes (hereinafter referred to as cranes). | | Standard ID | () | | Description (Translated English) | (Technical specifications for ceramic capacitive sensor type partial discharge monitoring devices of 35kV and below) | | Sector / Industry | Chinese Industry Standard | | Date of Issue | 2023-10-11 | | Date of Implementation | 2024-04-11 | | Issuing agency(ies) | National Energy Board |
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