MHT5109-2013 English PDFUS$599.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email. MHT5109-2013: The airport aircraft operation and noise monitoring system specification Status: Valid
Basic dataStandard ID: MH/T 5109-2013 (MH/T5109-2013)Description (Translated English): The airport aircraft operation and noise monitoring system specification Sector / Industry: Civil Aviation Industry Standard (Recommended) Word Count Estimation: 24,250 Date of Issue: 30/9/2013 Date of Implementation: 1/12/2013 Issuing agency(ies): Civil Aviation Administration of China MHT5109-2013: The airport aircraft operation and noise monitoring system specification---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.The airport aircraft operation and noise monitoring system specification ICS 49.100 V 55 Civil Aviation Industry Standard of the People's Republic of China Airport aircraft operation and noise monitoring system technical specifications 2013-09-30 released 2013-12-01 implementation Issued by Civil Aviation Administration of China Table of contentsForeword...II 1 Scope...1 2 Normative references...1 3 Terms and definitions...1 4 Data acquisition...6 5 Data processing...12 6 Evaluation of Measurement Uncertainty...15 7 Data Report...15 8 Instruction Manual...17 Appendix A (Normative Appendix) Site Selection of Noise Monitoring Terminal...19ForewordThis standard was drafted in accordance with the rules of GB/T 1.1-2009. This standard is technically compatible with ISO 20906 "Acoustics-Unmanned Monitoring System for Aircraft Noise Around Airports" (Acoustics - Unattended monitoring of aircraft sound in the vicinity of airports) is the same. This standard was proposed by the Airport Department of the Civil Aviation Administration of China. This standard was approved by the Aircraft Airworthiness Certification Department of the Civil Aviation Administration of China. This standard is under the jurisdiction of the China Academy of Civil Aviation Science and Technology. Drafting organization of this standard. Civil Aviation University of China. The main drafters of this standard. Wang Xuan, Yan Guohua, Zhang Qing, Xue Yuan, Chen Zhiqiang, Duan Gang. Airport aircraft operation and noise monitoring system technical specifications1 ScopeThis standard specifies the data acquisition, data processing, measurement uncertainty, and data reporting of airport aircraft operation and noise monitoring systems And instruction manual. This standard applies to airport aircraft operation and noise monitoring systems. This standard does not apply to. -Provide methods for determining or approving aircraft noise certification data; --To provide a method to describe the noise generated by the aircraft on the ground (including ground movement or the use of auxiliary power devices). Except for the movement on the runway between the beginning of the roll to the ground and the landing from the ground to the departure of the runway.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document.3 Terms and definitionsThe following terms and definitions defined by ISO /IEC 80000-8 and IEC 61672-1 apply to this standard. 3.1 Aircraft operation The flight activity of an aircraft that can be detected as an aircraft noise event over or around the noise monitoring site. 3.2 Take off From the moment when the aircraft starts to roll or when its noise can be clearly identified from the residual sound (whichever occurs later) until the aircraft noise The sound cannot be identified from the residual sound (aircraft acoustics) movement between moments. 3.3 Approach From the moment the aircraft noise can be clearly identified from the residual sound, until the aircraft taxis to the runway exit after landing or the aircraft noise is not (Aircraft acoustics) movement between moments (whichever occurs first) that can be identified from the after sound. 3.4 Sound monitor An instrument that is installed at a specific location to automatically and continuously measure the noise generated by an aircraft flying over or near the microphone And equipment. 3.5 Sound-monitoring system A fully automatic continuous noise monitoring system deployed near the airport, including all noise monitoring terminals, central workstations and system operation All software and hardware used at the time. 3.6 Equivalent continuous sound pressure level Time-averaged sound pressure level 3.7 Maximum 1s equivalent continuous sound pressure level maximum one second equivalent continuous sound pressure level The maximum value of 1 s equivalent continuous sound pressure level within the specified time interval T. 3.8 AS-weighted sound pressure level 10 times the square of the sound pressure p at the base of ten divided by the logarithm of the square of the reference sound pressure, in decibels and the frequency weighting A and Time-weighted S (slow), where the reference sound pressure p0 is 20 μPa. 3.9 Maximum AS-weighted sound pressure level The maximum value of AS-weighted sound pressure level in a specified time period. 3.10 N% exceedance level or N percent exceedance level The AS-weighted sound pressure level is exceeded for N% of the time within the considered time T. 3.11 Aircraft sound event A data set sufficient to describe the noise parameters of a noise event generated by a single aircraft. Note. In this standard, “aircraft incident” and “single incident” refer to aircraft noise incidents. 3.12 Threshold level Any applicable user-defined sound pressure level to make true and reliable noise event detection as effective as possible. Note. The threshold level here is different from the term used to calculate the sound exposure level. 3.13 Sound exposure In a specified time period or event with a duration of T, the integral of the square of the sound pressure p is calculated according to formula (2). Note 1.The unit of acoustic exposure is Pascal square second, Pa2·s. Note 2.Due to the application limitation of the measuring equipment, p2 is usually used to represent the square of the frequency weighting and band limit sound pressure. As specified in IEC 61672-1 For specific frequency weighting, the appropriate subscript should be indicated. For example, EA, 1h refers to the A-weighted acoustic exposure within one hour. Note 3.For a single event, it is called "single event acoustic exposure", in which case E does not need to be subscripted. 3.14 Sound exposure level Note 2.For a single event, it is called "single event sound exposure level", which is represented by the symbol LE at this time. 3.15 Total sound The total noise around a certain time, a certain location and a certain environment, usually caused by many nearby or far noise sources (special Dingsheng and Yusheng). Including the names of total sound, specific sound, after sound and background sound, see Figure 1. 3.16 Specific sound The component of the overall sound that can be clearly identified and is related to a specific sound source. 3.17 Residual sound In a given location and a specific environment, when a specific sound is suppressed, the remaining noise. 3.18 Background sound Indicating parameters of the remaining sound. 3.19 Continuous sound measurement Use a sound level meter (or equivalent measuring device) to make continuous measurements. Note. This continuous measurement can measure the continuous sound level Lp(t). 3.20 Event detection Extraction of discrete sound events based on acoustic criteria. 3.21 Sound event The data set includes at least the sound exposure level, the maximum AS-weighted sound pressure level, the duration of the noise event, and the time stamp. Note 1.In order to properly classify the event, the event can contain more other information. Note 2.For the maximum short-term equivalent continuous sound pressure level, see 3.5. 3.22 Event classification Classification of sound events mainly based on acoustic knowledge. Note 1.Noise events can be classified as "aircraft noise events" or "non-aircraft noise events". Note 2.According to actual conditions, event detection and event classification can be performed at the same time. 3.23 Non-acoustical data Other information about non-acoustic aircraft operations. Examples. operating information provided by airports, aircraft position information recorded by radar, etc. 3.24 Event identification The process of using information irrelevant to acoustics to determine the possible relationship between aircraft noise events and specific aircraft operations. 3.25 Identified aircraft sound event An aircraft noise event related to the operation of a particular aircraft has been determined. Note. The data collection of identified aircraft noise events may include operational information such as aircraft model, runway, and track.4 Data acquisition4.1 Equipment 4.1.1 Overview In order to monitor aircraft noise, each measurement channel used in the fully automatic noise monitoring system should meet the requirements of Class I in IEC 61672-1. The electroacoustic performance requirements of sound level meters. The system should be able to measure A-weighted parameters. Frequency weighting should conform to the reference direction (reference side Direction refers to the standard incident angle of the diaphragm of the microphone, that is, 0 incident angle) The response specification of the plane sound wave entering the microphone. Selection of reference direction The requirements should be stated in the instruction manual of the noise monitoring system manufacturer. The test results can be printed in the central workstation or other places, or displayed in other places. Note 1.For other requirements related to temperature range see 4.9.2, and related requirements of the instruction manual see Chapter 8. Note 2.An optional one-third octave band spectrum noise measurement value can be obtained. 4.1.2 Microphone components All microphone components used in normal operation (including microphones, preamplifiers, rain protectors, wind shields, microphone support parts, Bird protection devices, lightning protection devices and calibrators) should meet the following requirements. the lightning protection device is at least 0.5 m away from the microphone; all other equipment (such as, Anemometer) at least 1 m below the microphone and at least 1.5 m horizontally from the microphone holder. If such an arrangement is not feasible in practice, the resulting measurement uncertainty component should be recorded. 4.1.3 Microphone hood In order to perform noise measurement, an appropriate wind shield should be installed around each microphone, and the wind shield and its supporting parts should be used as sound transmission Part of the device. The microphone windshield assembly should be tested according to the manufacturer’s recommended method to determine whether the relative microphone is a stable incident angle, An indication of the A-weighted sound pressure level produced by the wind at a speed of 10 m/s. The test results should be stated in the instruction manual. Wind noise A at a speed of 10 m/s The equivalent continuous sound pressure level after weighting for 1 min shall not be greater than 65 dB. 4.2 Microphone installation Selection of noise measurement points The unmanned microphone measurement point should be selected at the location where the residual sound (for example, non-aircraft noise) generated has the least impact. Due to the presence of residual sound, there will always be some low-noise aircraft that cannot be accurately measured. In order to be able to rely solely on sound level recognition technology For reliable noise event detection, the selection of measurement points should satisfy the A-weighted maximum sound pressure level of the quietest aircraft being detected should be higher than the remaining The long-term average sound pressure level of sound is above 15 dB, see Appendix A. Note. Typical residual sound sources include main roads, factories, air-conditioning equipment, various pumps, trees that rustle when the wind is blowing or attract birds to stop, and rain and rain. Metal roof etc. during hail. 4.2.1 Requirements for selecting measuring points Figure 2 shows the relationship between a typical straight track and the position of the monitoring terminal. The shortest distance s (usually called the slope distance) is perpendicular to the track. At the slant distance s, the aircraft produces a specific sound pressure level LAS. Since the sound is transmitted in a spherical shape, the monitoring terminal is 3s away from the aircraft. The sound pressure level measured at the end will be attenuated by at least 10 dB. 4.2.2 Reflecting surfaces other than the ground When choosing an appropriate location for the microphone, the reflection effects of reflective surfaces other than the ground should be minimized. In order to estimate the optimal transmission For the position of the sounder, it can be assumed that the sound travels in a straight line from the aircraft to the microphone and the large reflective surface is like a mirror reflection. Select the microphone The location should be such that any reflective surface other than the ground will not reflect the sound of the aircraft on the relevant flight segment to the microphone. All acoustically related reflective surfaces other than the ground should be at least 10 m away from the microphone, in order to maximize the uncertainty in the sound pressure level measurement. small. 4.2.3 Microphone height The standard microphone height should be at least 6 m above the ground. In order to reduce the influence of ground reflection, the microphone height should be between 6 m and 10 m. Note 1.If the microphone height is relatively low (for example, 4 m), it is likely to interfere with the measurement of aircraft noise dominated by low frequencies, such as propellers Or lower bypass than jet engine aircraft. If the frequency spectrum analysis is performed, it can be seen that when the microphone height is low, the ground reflection effect may become an Advantage factor. Note 2.The microphone installed on the roof (such as installed on a hard surface with a limited area) is more sensitive to the sound reflection effect from the hard surface. Measured sound pressure level It depends on the angle of the sound wave coming into the microphone, the area and inclination of the reflecting surface, and the frequency spectrum of the sound wave, which depends on the engine model and aircraft Operation and distance, and how close the microphone is to the edge of the roof. 4.3 Recommended monitoring parameters 4.3.1 Continuous sound level The monitoring terminal shall continuously monitor and display the total sound pressure with the equivalent continuous sound pressure level of 1 s or less and the AS weighted sound pressure level time series as required. A-weighted sound pressure level. 4.3.2 Sound pressure level of a single noise event An aircraft noise event is characterized by the sound exposure level LE, A and the maximum sound pressure level Lp, AS, max or Lp, A, eq, 1s, max (for details and other requirements, see 5.3). Note 1.In some cases, only the part of the aircraft noise event that is above the threshold level of the monitoring system is described as an "event". Note 2.Not every audible aircraft event must be distinguished from the sound level record. The calculation of the sound exposure level of aircraft noise events should be accurate to more than 0.1 dB. This accuracy does not mean that the measurement of the sound exposure level is uncertain The degree is only 0.1 dB. Any final acoustic exposure readings are not directly measured, but calculated by the system after basic acoustic exposure measurements. Got it. 4.3.3 Percent N exceeds the sound level If you want to calculate the excess sound level, the time interval and the method for calculating the N% excess sound level should be clearly stated in the instruction manual (see Chapter 8). The recommended minimum sampling frequency for AS-weighted sound pressure level is 8 times per second. 4.4 Time stamp The aircraft noise monitoring system should include a reliable clock to record the date and time of each noise event and related phenomena. between. At all times of the day, the error between the clock and the real time should not be greater than 2 s. If a power failure occurs, the clock should continue to work until To the system restart. The interruption of time recording should be clearly displayed. If there are multiple clocks in the system, the error between them should not Greater than 2 s. The accuracy of each clock should be within 1 s. The time should be local time. The noise monitoring system should be able to automatically use Coordinated Universal Time (UTC) for calculation and be able to perform local Convert between standard time and daylight saving time. 4.5 Aircraft noise event detection and classification An automatic noise monitoring system should be able to reliably and accurately detect aircraft noise events and classify them. There are many types according to the situation Technical methods can be applied to the detection of aircraft noise events. Different technical methods may be required at different times of the day. The selected technical method should be able to accurately classify aircraft noise events to meet. a) The expanded uncertainty (U95, see Chapter 6) of the cumulative exposure level of all measured aircraft noise events should not be greater than 3 dB; b) At least 50% of aircraft noise events are correctly classified as aircraft noise events; c) The number of non-aircraft noise events that are incorrectly classified as aircraft noise events should be lower than the actual number of aircraft noise events Purpose 50%. In order to evaluate the above criteria b) and c), in practice, the time of individual appearance of each aircraft (not the number of radars) is manually determined. According to data), and the respective sound exposure levels observed or recorded on-site, to classify aircraft noise events. At least Including twenty noise events of the same type of aircraft, and the A-weighted sound exposure level of each aircraft should be at least higher than the ground background sound level Out of 5 dB. Note. If the noise monitoring terminal includes a noise event recognition function (see 3.17～3.23), some monitoring terminals have this function, the error rate will be Much smaller than the values given in a) and c). 4.6 Measuring range The measurement range of the sound pressure level of the noise monitoring terminal shall be at least 30 dB～120 dB. The linear working range at 1 kHz frequency should not be less than 60 dB. The sound pressure level and noise events that exceed the range of the instrument should be marked. If at the monitoring point, the measurement lower limit of the monitoring terminal is not lower than the actual minimum sound pressure level or the upper limit is not higher than the actual maximum sound pressure Level, it will significantly increase the uncertainty of measurement. To avoid this increased uncertainty, it is recommended that the linear range of the monitoring terminal should be greater than this The difference between the maximum sound pressure level and the minimum sound pressure level at the location. 4.7 Data transmission 4.7.1 Overview Data can be transmitted from the monitoring terminal to the central workstation in two ways. continuous transmission and intermittent transmission. Used for sound pressure level data transmission The resolution of the software and hardware should be below 0.1 dB, and the validity of all transmitted data can be verified. Should be able to check the calibration status and due to memory The time period of data loss caused by overflow, power failure or instrument failure is dis......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of MHT5109-2013_English be delivered?Answer: Upon your order, we will start to translate MHT5109-2013_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 MHT5109-2013_English with my colleagues?Answer: Yes. The purchased PDF of MHT5109-2013_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 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. |
