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HJ 918-2017: Technical specifications for environmental vibration monitoring
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Technical specifications for environmental vibration monitoring
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HJ 918-2017
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Basic data | Standard ID | HJ 918-2017 (HJ918-2017) | | Description (Translated English) | Technical specifications for environmental vibration monitoring | | Sector / Industry | Environmental Protection Industry Standard | | Classification of Chinese Standard | Z04 | | Word Count Estimation | 9,981 | | Date of Issue | 2017-12-28 | | Date of Implementation | 2018-04-01 | | Regulation (derived from) | Ministry of Environmental Protection Bulletin 2017 No. 85 | | Issuing agency(ies) | Ministry of Ecology and Environment | HJ 918-2017: Technical specifications for environmental vibration monitoring---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.
People's Republic of China national environmental protection standards
Technical specifications for environmental vibration monitoring
2017-12-28 Published
2018-04-01 implementation
Directory
Foreword ii
1 scope of application .1
2 Normative references .1
3 Terms and definitions 1
4 instrument performance .2
5 Measurement conditions .2
6 measuring point layout .2
7 vibration pickup installation .2
8 sampling and data analysis .3
9 Measurement period, measurement 4
10 Measurement records .4
11 Quality Assurance and Quality Control 5
Foreword
This standard is formulated for the purpose of implementing the Environmental Protection Law of the People's Republic of China and standardizing the monitoring of environmental vibration in China.
This standard specifies the performance of environmental vibration monitoring instruments, measuring conditions, measuring point layout, vibration pickup installation, sampling and
Data analysis, measurement period and measurement, measurement records, quality assurance and quality control and other technical requirements.
This standard is released for the first time.
This standard by the Environmental Protection Department of Environmental Monitoring Division and Science and Technology Standards Division to develop.
This standard was drafted. China Environmental Monitoring Station, Changsha Environmental Protection Vocational and Technical College, Hunan Provincial Environmental Monitoring Center Station.
This standard MEP approved on December 28,
This standard since April 1,.2018 come into operation.
This standard is interpreted by the MEP.
Environmental vibration monitoring technical specifications
1 scope of application
This standard specifies the performance of environmental vibration monitoring instruments, measuring conditions, measuring point layout, vibration pickup installation, sampling and
Data analysis, measurement period and measurement, measurement records, quality assurance and quality control and other technical requirements.
This standard applies to environmental vibration monitoring.
2 Normative references
This standard references the following documents or the terms of them. For undated references, the effective version applies
In this standard.
GB 10070 urban area environmental vibration standard
GB 10071 urban area environmental vibration measurement method
GB/T 23716 human response to vibration measuring instruments
3 Terms and definitions
GB 10071 defined and the following terms and definitions apply to this standard.
3.1
Environmental vibration monitoring
In order to grasp the impact of the vibration generated in industrial production, construction, transportation and social life on the surrounding environment
Monitoring carried out.
3.2
Equivalent continuous Z-level equivalent continuous Z-vibration level
In the provisions of the measuring period Z vibration level average energy, denoted as VLZeq, in decibels, dB.
By definition, the equivalent continuous Z-vibration level is expressed as.
3.3
Sampling frequency
Sampling rate, also known as sampling speed or sampling rate, refers to the number of samples taken per second from a continuous signal and forming a discrete signal
The number, expressed in fs, in Hertz, Hz.
3.4
Window function window function
In digital signal processing, in order to reduce or eliminate spectral energy leakage and fence effects, different interception functions
The signal truncation, truncation function called window function, referred to as the window.
4 instrument performance
4.1 should be used in line with GB/T 23716 environmental vibration meter performance requirements or other to meet the same function of vibration measuring instruments.
4.2 Vibration pickup voltage sensitivity should be greater than 400 mV/g.
4.3 The frequency range of vibration pickup shall include at least the frequency specified in GB 10070.
4.4 The lower limit of measurement of the instrument should not be higher than 50 dB and the upper limit of measurement should not be lower than 100 dB.
4.5 Measurement should include the equivalent continuous Z vibration level, the maximum Z vibration level, the cumulative percentage Z vibration level and so on.
5 Measurement conditions
5.1 Measurement process, vibration source should be in normal working condition.
5.2 Measurement should be no rain, no lightning, no strong winds weather conditions.
5.3 During the measurement, other environmental factors that can affect the measured value should be avoided, such as drastic temperature gradient changes,
Magnetic field caused by interference. When necessary, consider the appropriate shelter (such as adding protective cover, etc.).
5.4 Measurement process, should avoid other interference factors, such as high noise, walking and other interference caused.
6 measuring point layout
6.1 measuring point should be placed in the test building affected by the vibration source relatively large position, through the site to consult or interval a certain distance cloth
Set multiple test points to determine.
6.2 The distance between the measuring point and the measured building shall be in accordance with the provisions of GB 10070.
6.3 Outdoor measurement process, below the measuring point basement, cellar or shelter should be avoided as far as possible.
6.4 When necessary, the measuring point can be placed in the center of the floor of the building indoor, it is strictly prohibited to be placed in the bottom basement. According to the actual situation
Conditions, the use of the measured function of the room within the building, size (room size, floor thickness, etc.), floors and other properties should be different
Test points shall be laid out separately, including the most affected locations.
6.5 According to the actual demand, different attributes of buildings (building functions, building height, etc.) can be deployed test points.
6.6 When the front of the building does not have the measurement conditions or interference with other factors, the measurement points can be laid in the environmental vibration conditions and
The relative location of the place.
7 vibration pickup installation
7.1 Sensitivity of the Vibration Picker The direction of the main shaft should be kept in the vertical direction, and no inclination and additional vibration shall occur during the test.
7.2 Vibration picker should be smooth on a flat, solid ground (such as hard soil, concrete, asphalt pavement, etc.), not
Directly placed on the grass, sand, snow, carpets, wooden floors and other soft ground.
7.3 All three points of contact or bottom of the vibration exciter should touch the ground. When the vibration pickup can not be in close contact with the ground, it should be used
Magnetic base adsorption, quick-drying powder bonding and other rigid connection to the vibration picker fixed on the ground, prohibit the use of soft plastic and other soft connection
Fixed pickup.
7.4 Measurement sites such as grass, sand, snow, carpets and other soft ground, the need to use auxiliary measuring devices, and monitoring
Record description. The three legs of the auxiliary measuring device must all penetrate into the ground so that the underside of the auxiliary measuring device touches the ground,
The vibration picker is placed in the middle of this auxiliary measuring device (see Figure 1). Auxiliary measuring device made of steel production, Figure 2 is given
The reference size.
7.5 Measures should be taken to connect the data line connecting the vibration isolator to the ground, to prevent the measurement error caused by the shaking of the connecting wire.
Figure 2 Auxiliary measuring device reference size
8 sampling and data analysis
8.1 Measurement instrument time weighted constant take 1 s, vibration signal sampling interval of not more than 0.1 s.
8.2 When using the oscilloscope vibration signal test, the sampling frequency should meet the Nyquist sampling theorem requirements, the sampling frequency and
The highest frequency of the vibration source to be measured should take 6.
8.3 Calculating the vibration level by using the calculation software through signal processing, the window function should be added. For random signal processing should choose
Hanning window, the impact of signal processing should choose a rectangular window.
9 Measurement period, measurement
9.1 Measurement period
In the daytime and nighttime, respectively, choose to reflect the building by the impact of environmental vibration maximum time to measure.
9.2 Measurement
9.2.1 steady-state vibration
Generally include rotating machinery (fans, generators, motors, pumps, etc.) and reciprocating machinery (diesel,
Air compressors, textile machines, etc.) and other environmental vibrations, measuring the amount of equivalent continuous Z-vibration level VLZeq.
9.2.2 Random vibration
Generally include road traffic, industrial enterprises, construction and construction, the vibration generated in social life (except shock vibration),
Measure the cumulative percentage Z vibration level VLZ10.
9.2.3 Shock Vibration
Generally include forging machinery (forging hammer, punch, etc.) and construction machinery (such as pile drivers, etc.) and caused by blasting
Of the environment vibration, measured the maximum Z vibration level VLZmax.
9.2.4 Urban Rail Transit and Railway Vibration
a) Measure the maximum Z-vibration level VLZmax for each train passing period.
b) The train that has a great influence on the track under test should be selected for monitoring the train.
10 measurement records
Measurement records should include the following.
a) Measurement date, measurement time, place and surveyor.
b) measuring instruments. instrument name, model, number, accuracy level, test date and so on.
c) Measurement conditions. weather conditions, with or without other vibration interference
d) Ground conditions and vibration pickup installation.
e) the type and form of vibration source, operating conditions.
f) the basis for the measurement.
g) Measurement results.
h) measuring point diagram. Need to indicate the relative position and distance between the vibration source and the measuring point, the surrounding environment (the surrounding buildings
Objects, topography, topography, etc.).
i) Other matters to be recorded.
11 Quality Assurance and Quality Control
11.1 Instrument Requirements
11.1.1 measuring instruments (including vibration picker) should be accredited by the national accredited measurement units, at least once a year, and at
Used within the validity period.
11.1.2 should be based on ambient temperature and humidity measurement instruments, environmental temperature and humidity than the allowable temperature and humidity
Degree range, the measurement result is invalid.
11.2 Monitoring personnel requirements
11.2.1 Personnel undertaking environmental vibration monitoring should be professionally trained.
11.2.2 Each site monitoring should be at least 2 people.
11.3 Monitoring records
Record as required and fill in the relevant monitoring form.
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