This standard specifies the terms and definitions in Part 1 to Part 4 of the national standard series "Statistical methods for acoustic determination and verification of noise radiation values ​​of machinery and equipment". This standard applies to both the determination and verification of the label values ​​of small-batch production and mass production marked individually and the sampling label values ​​of large-scale production. GB/T 14573.1-1993 Statistical methods for acoustic determination and verification of noise radiation values ​​specified by machinery and equipment Part 1: Overview and definitions GB/T14573.1-1993 standard download decompression password: www.bzxz.net
This standard specifies the terms and definitions in Part 1 to Part 4 of the national standard series "Statistical methods for acoustic determination and verification of noise radiation values ​​of machinery and equipment". This standard applies to both the determination and verification of the label values ​​of small-batch production and mass production marked individually and the sampling label values ​​of large-scale production.

National Standard of the People's Republic of China
Acoustics-Statistical methods for determining and verifying stated noise emission values ​​of machinery and equipment
Part 1: Overview and definitions
Acoustics-Statistical methods for determining and verifying stated noise emission values ​​of machinery and equipment Part 1: General specifications and definitions This standard adopts the international standard IS (7574/1-1985. This standard series consists of four parts:
Part 1: Overview and definitions;
Part 2: Determination and verification methods for the plate value of a single machine;
Part 3: Determination and verification of the plate value of a batch of machines by a simple method! Part 4: Determination and verification methods for the plate value of a batch of machines. 1 Subject content and scope of application
GB/T14573.1-93
This standard specifies the terms and terms related to Parts 1 to 13 in the national standard series of "Acoustics-Statistical methods for determining and verifying stated noise emission values ​​of machinery and equipment". This standard applies to both the determination and verification of machine plate values ​​for small-scale production marked individually and for large-scale production machines marked by sampling.
2 Reference standards
GB3358 Statistical terms and symbolswwW.bzxz.Net
G13 3767
Determination of sound power level of noise source, engineering method and quasi-engineering method. Simple method for determination of sound power level of noise source
GB3768
GB3785 Electrical and acoustic properties and test methods of sound level meter (B 6881 Determination of sound power level of acoustic noise source. Precision method in anechoic chamber and upper range method. GB6882 Determination of sound power level of acoustic noise source. Precision method in anechoic chamber and semi-anechoic chamber. GB/I 14574 Noise labels for acoustic machines and equipment 3 Terms and terms
3.1 Sound power level La-(minute) sound power level LwlB) The sound power level of machine radiated noise is the logarithm to the base 10 of the ratio of the sound power radiated by the machine to the reference sound power multiplied by 10, that is, Luw1algw.
Approved by the State Administration of Technical Supervision on August 28, 1993 (1
Implemented on March 1, 1994
Where: W=10-12(w).
GB/T 14573.1—93
3.2 A-weighted sound power level Lw (dB) AweighledaoundpnwerlevelLwa (dB) According to the corresponding test specifications, the sound power is determined by A-weighting. 3.3 Noise radiation, noise emissionquanitity, noise emissionvailue Noise radiation is the basic physical basis for evaluating noise radiation, expressed by A-weighted sound power level. Noise radiation value refers to the value of any noise radiation.
Note: The use of other noise radiation quantities is not excluded. 3.4 Measured value mcasuredvalue
The measured value refers to the noise emission value of a single machine actually measured by an appropriate test method. It represents the result measured using this measurement method.
3. 5 Machine type family of Machines and equipment with similar designs or similar types and performing the same functions are called the same machine type. If they can meet the same performance or daily requirements, comparable products with similar designs but different specifications can be considered as one type. 3.6 Stated value (label value) L. valne) L is the noise radiation value expressed as an integer for a single machine or for all machines in a batch of machines. It represents the limit value. When the machine is new, a certain proportion of a single machine or a batch of machines should be below this limit value. When the A-weighted sound power is used as the noise radiation value, the specified value can be expressed as the A-weighted sound power limit value. 3.7 Label label
The label is an expression of the label value, which is attached to the machine equipment1 or included in the product documentation at the same time. 3.8 Batch of machines batch (lot) of machines a certain number of machines of the same type with the same technical specifications and characterized by the same label value L. 3.9 Batch N size of thc batch N
The number of individuals included in the batch The number of machines in the batch or the number of noise radiation values) 3.10 Sample sample
One or more subsamples of the white population are taken to provide information about the population and as a basis for possible judgments about the population (or the process that produces the population). For example, one or more machines (or measurement values) randomly selected (or determined) from a batch of machines (or all machines):
3.11 Sample size nsample size n
The number of sampling units contained in the sample. 3. 12 The arithmetic mean of a batch (or a population)± arithmetic meancan of a butch or a populatinn &The sum of the noise radiation values ​​in the batch (or population) divided by the batch size (or population size), that is: (2)
3.13 The arithmetic mean of the sampleLarithnicmeancfasanpleZThe sum of the sample measurement values ​​divided by the sample size, that is: (3)
The arithmetic mean L of the sample can be used as an estimate of the batch (or population) mean L: 3.14 Standard deviation of a batch (or of a population)CB/T 14573.193
The standard deviation of the noise radiation value of a batch (or population) N is given by formula (4). 3.15 The standard deviation of a sample is given by formula (5):
The standard deviation of a sample S can be used as an estimate of the standard deviation of a batch (or population). 3.16 Standard deviation of repeatability a, standard deviation of repratability a,4
The standard deviation of the noise radiation value obtained under repeatability conditions. That is, the standard deviation obtained by repeatedly applying the same noise radiation measurement method to the same noise source under the same conditions (same experimental experiment, operator and instrument device) in a short time. 3.17 Standard deviation of reproducibility wstandarddeviationofreproducibilityoThe standard deviation of the noise radiation value obtained under reproducibility conditions, that is, the standard deviation obtained by using the same noise radiation measurement method to the same noise source at different times and different conditions (different laboratories, operators and instrument devices). Therefore, the reproducibility standard deviation includes the repeatability standard deviation.
3.18Product standard deviation dpstandarddeviationofproductiong The standard deviation of the different means of noise radiation values ​​obtained from different machines in a batch of machines under repeatable conditions (same laboratory, operator and instrument configuration) using the same noise measurement method. That is: ,2
Where: -- standard deviation of the mean;
-- repeatability standard deviation;
K -- the number of measurements required to determine the mean of a machine. Note: In practice, the value of this item K can be ignored. 3.19Overall standard deviation a1otalstandarddeviationa, reproducibility standard deviation The square root of the sum of the squares of the squares of the noise. That is: c, = Vor3+ o2
3.20Reference standard deviation omreference standard deviation 0m is the total standard deviation specified for a certain type of machine, which serves as the representative value of the total standard deviation of batch machines of this type. (6)
Note: Using a fixed m for each type of machine makes it possible to use statistical methods to deal with small samples. Representative values ​​of m range from 1.5 dB to 3.5 dB, depending on the precision of the measurement method used and the repeatability of the noise source. In order to establish m for each type of machine, extensive experiments can be carried out. 3.21-sampling single sampling
Sampling method in which only one sample is drawn from the batch. 3.22 double sampling
CB/T 14573.193
A sampling method that decides whether to draw a second sample based on the information provided by the first sample. 3.23 Sequential sampling This sampling method is a sampling method in which the number of sampling is not fixed in advance and samples are taken one by one until acceptance or rejection is determined by a predetermined criterion. 3.24 Inspection by variables Inspection by variables An inspection method in which a certain characteristic is measured for each individual in the inspection batch (or a sample taken from the batch). Here, the quantitative characteristic is the noise re-radiation.
Note: In GB14573.2~14573.4, the method of using the above standard deviation to evaluate the qualified product rate of a batch is called method. This standard does not adopt this method. The standard deviation obtained by measuring all items in the sample is used to evaluate the conforming rate of the batch. This series of standards does not consider the use of counting inspection, that is, for the population or each item sampled from the population, the presence or absence of a certain attribute is recorded, and the number of individuals with or without this attribute is calculated. 3.25 Probability of acceptance PtiroalbiliiyofacceptanceP The probability of accepting a batch with a certain quality according to a given sampling plan. Note: (1-P) is called the rejection probability. If (1-P) has a fixed value, it is called the producer's risk. If (1-P) has a fixed value β, it is called the user's risk. 3.26 Operating characteristic curve of sampling plan (COC curve)
For a given sampling plan, it is a curve that represents the functional relationship between the probability of acceptance and the actual quality of the batch. That is, this strip line represents the probability P of a batch of products being accepted through sampling, which is a function of force, where force is the proportion of noise radiation values ​​in the batch of products exceeding the label value. Note that the X curve has a specific point (such as the production risk point and the user risk point) or a point (such as the production risk point and the user risk point) that is completely certain.
3.27 The production risk jroducerstiak
corresponds to a point on the sampling characteristic curve that is determined in advance and has a relatively small acceptance probability, and is usually a low rejection probability, which is called the production risk. point. This rejection probability is called the producer's risk. The corresponding quality level is the proportion of the noise emission value of the batch of products exceeding the label value. In practical applications, the producer's risk can usually be specified as 5%.
Note: (According to GB14573.4, the producer's risk point is fixed, so α and force... form a pair of fixed values. 2 In continuous batch production, the acceptable quality level (AQI.) should be approximately equal to force 43.28 User's risk On the rejection characteristic curve, it corresponds to a point with a predetermined and relatively small acceptance probability, usually a low acceptance probability β, which is called the user's risk point. This acceptance probability is called the user's risk. The quality of the corresponding batch is the proportion P of the noise emission value of the batch of products exceeding the label value, and is called the limit quality. In practical applications, the user's risk can usually be specified as 10% or 5%. 3.29 Level difference △Llevcldifference△L for "a fixed producer's risk point, it is a value used to consider the user's point of view and it is mainly achieved by selecting appropriate samples The size n is generated. Subtracting the nominal value (i.e. one) gives a low nominal value and a noise emission value that is proportional to the power exceeds L, so that there is only a very low probability of reception β. Additional remarks:
This standard was proposed by the National Technical Committee for Acoustic Standardization. The Machinery Industry Environmental Protection Technology Research Institute of the Ministry of Machinery is responsible for this standard, and the Shanghai Electric Science Research Institute of the Ministry of Machinery is responsible for this standard. The Department of Precision Instruments of Tsinghua University participated in this standard. The main drafters of this standard are Shang Deyuan, Chen Yeshao, Zhang Yufeng, and Xie Dehai and Dai Hongming.
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