GB/T 33771-2017 English PDF

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GB/T 33771-2017: Sound system equipment -- Electro-acoustical transducers -- Measurement of suspension parts
Status: Valid

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Basic data

Standard ID: GB/T 33771-2017 (GB/T33771-2017)
Description (Translated English): Sound system equipment -- Electro-acoustical transducers -- Measurement of suspension parts
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: M70
Classification of International Standard: 33.160.50
Word Count Estimation: 17,131
Date of Issue: 2017-05-31
Date of Implementation: 2017-12-01
Quoted Standard: GB/T 12060.1-2017
Adopted Standard: IEC 62459-2010, MOD
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
Summary: This standard specifies the parameters and measurement methods for measuring the performance of suspension members, such as centering, folding, diaphragm or cone, before the electro-acoustic transducer assembly. The measurement results can be used for engineering design and quality control. This standard improves the consistency of measurement results between the suspension component manufacturer and the speaker manufacturer. This standard is applicable to the measurement of the suspension components of electroacoustic transducers (eg loudspeakers). Based on the linear model and the nonlinear model of the suspension part, the static parameters and the dynamic measurement method are used to measure the relevant parameters.

GB/T 33771-2017: Sound system equipment -- Electro-acoustical transducers -- Measurement of suspension parts

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Sound system equipment - Electroacoustical transducers - Measurement of suspension parts ICS 33.160.50 M70 National Standards of People's Republic of China Sound system equipment Measurement of Suspension Components of Electroacoustic Transducers (IEC 62459..2010, MOD) 2017-05-31 released 2017-12-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released Directory Preface III 1 Scope 1 2 normative reference document 1 3 Terms and definitions 1 4 Test conditions 4 5 fixed parts of the suspension 5 5.1 Overview 5 5.2 Damage measurement 5 5.3 Lossless measurement 5 5.4 Fixed position 5 5.5 Orientation of internal fixation 5 5.6 Fixed status report 5 6 Measuring method 5 6.1 Static measurement method 5 6.2 quasi-static measurement method 5 6.3 Dynamic incremental measurement method 6 6.4 Full dynamic measurement method 6 7 static displacement xstatic (Fdc) 6 7.1 Definitions 6 7.2 Measurement method 6 8 static stiffness factor Kstatic (xdc) 7 8.1 Definitions 7 8.2 Measurement method 7 8.3 Measurement results report 7 The minimum resonant frequency f0 of the cone with a folded ring 9.1 Definitions 8 9.2 Measurement method 8 10 Dynamic stiffness factor K (xac) 9 10.1 Definitions 9 10.2 Measuring method 9 11 K (x) of the power series expansion coefficient 11 11.1 Definitions 11 11.2 Measurement results report 11 12 effective stiffness coefficient Keff (xpeak) 11 12.1 Definitions 11 12.2 Measurement method 12 12.3 Measurement results report 12 13 resistance resistance R 12 13.1 Definitions 12 Method of measurement 13.3 Measurement results report 12 Reference 13 Figure 1 static displacement measurement method 6 Fig.2 Measuring method of minimum resonant frequency f0 of cone Figure 3 Pneumatic Excitation of Suspension Parts Figure 4 normalized transfer function H (f)/H (0) amplitude response on frequency f

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard uses the re-drafting method to modify IEC 62459..2010 "sound system equipment electro-acoustic transducer suspension parts measurement". The main technical differences between this standard and IEC 62459..2010 are as follows. --- will 3.6,3.7 in the "note" were moved to the text of 3.6,3.7; --- modify the contents of 3.11, the "f0 ≈ 2π K (xoff) δmS "Modified to" f0 ≈ 2π C (xoff) δ mS "(See 3.11); --- modified the contents of 6.3, will use a certain size of the constant DC signal (such as constant displacement xdc) and small AC signal (Such as displacement xac) aliasing as an excitation source, measuring the steady-state suspension of the AC component response (such as the return force of the AC part Fac "is modified to" use a constant DC signal with a certain size (such as constant force Fdc) and a small AC signal (such as restoring force AC part of the Fac) aliasing as the excitation source, measuring the steady-state suspension of the AC component response (such as displacement xac) "(see 6.3); --- modified the contents of 6.4, will use a certain size of the AC signal (such as displacement xac) as the excitation source, measuring the suspension components Of the AC response (such as the exchange of response Fac) "modified to" use a certain size of the AC signal (such as AC reply force Fac) As an excitation source, measure the AC response of the suspension (eg displacement xac) "(see 6.4); --- delete the 7.2.3 "note" footnote; - modify the contents of 9.1, and amend "(6)" to "(1)" (see 9.1); --- increase the "use of wide-band sinusoidal signal to measure the displacement amplitude response X (jω), to find the resonant frequency fR, get the most Good measurement setting parameters (measuring voltage, peak displacement) "(see 10.2.3). This standard is proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This standard is nationalized by the National Audio, Video and Multimedia Systems and Equipment Standardization Technical Committee (SAC/TC242). The drafting of this standard. Nanjing Institute of Acoustics, Zhejiang Tianle Group Co., Ltd., Guangzhou Guoguang Electric Co., Ltd., Suzhou Shangsheng Electronics Co., Ltd. The main drafters of this standard. Shen Yong, Xia Jie, Liu Yin, Lu Guochao, Xie Shouhua, Chai Guoqiang. Sound system equipment Measurement of Suspension Components of Electroacoustic Transducers

1 Scope

This standard specifies the measurement of the suspension components before the electro-acoustic transducer assembly, such as centering, folding, diaphragm or cone performance of the relevant parameters Number and measurement methods. The measurement results can be used for engineering design and quality control. This standard can improve the manufacturer of the suspension parts and the speaker manufacturer Consistency of measurement results. This standard applies to the measurement of the suspension components of electroacoustic transducers (eg loudspeakers). Based on the linear model and the nonlinear model of the suspension component, Static measurement method and dynamic measurement method were used to measure the relevant parameters.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. GB/T 12060.1-2017 Sound System Equipment Part 1 Overview (IEC 60268-1. 1985, MOD)

3 terms and definitions

The following terms and definitions apply to this document. 3.1 Suspension parts A centering piece made of a dipped cloth, or a loop made of rubber, foamed material, paper or cloth. 3.2 Displacement The distance at which the inner edge of the suspension member moves in the vertical direction. 3.3 Peak displacement xpeak The peak of displacement at the resonant frequency in the dynamic measurement. 3.4 Driving force The restoring force, the frictional force and the inertia of the suspension member and its inner edge fixture. 3.5 Transfer function H (f) The ratio of the displacement spectrum X (jω) = FT {x (t)} to the driving force spectrum F (jω) = FT {F (t)} is defined by the formula (1) ......

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