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Definition of reliability and scope of application The definition of loudspeaker reliability is defined as "the ability of the loudspeaker product to perform the specified function within the specified conditions and within the specified time." It is the time quality indicator of the loudspeaker product after it is used to describe the loudspeaker In the course of use is easy to damage and reliability. Marine Speakers As the requirements of the user increase, the speaker structure is becoming increasingly complex (such as car speakers), the output power is getting bigger (such as PA speakers), the use of more and more harsh environment (such as outdoor speakers), Marine Speakers will lead to reliable speaker products Sexual level down. At the same time, such as the use of new materials, new technology or new technology, will make the speaker unreliable factors increased.
The reliability of the loudspeaker can also be defined as "the number of failures allowed by the speaker product under specified conditions and within a specified time." Marine Speakers The mathematical expression is the mean time between failures (MTBF). It can be considered that the random failure is unavoidable and acceptable, which also leads to failure due to design reasons or manufacturing process, Marine Speakers as long as within the allowable number, often no longer for further traceability. To this end, as early as 1995 the international community began to define the traditional reliability and random failure can not avoid the old concept of the question, while the reliability of the project began to implement the physical method of failure. In Europe, the use of maintenance-free use (MFOP) to replace the original MTBF, the failure rate of the curve of the curve was broken [21. Therefore, Marine Speakers in combination with the failure of physical methods and failure analysis method, it is not a delusion to design a loudspeaker product that does not have random failure. A considerable number of foreign enterprises have already done fruitful work in this area.
The "defined conditions" in the definition of reliability determine a wide range of reliability, and the reliability of the product is strongly related to the working conditions of the product, Marine Speakers the conditions of use, and the environmental conditions for storage and transportation. Conditions can be divided into the use of conditions and the surrounding environment two categories. The conditions of use refer to stress conditions that affect the interior of the product, including various electrical stresses, Marine Speakers chemical stresses, and physical stresses. Ambient conditions include temperature, humidity, air pressure, harmful gases, mold, salt spray, shock, vibration and radiation and other environmental stress conditions. Marine Speakers In this sense, environmental testing is also attributable to reliability testing. These stress conditions can be applied separately or in combination, and the effect of the integrated application on the reliability of the loudspeaker product will be more pronounced.
The failure rate of the loudspeaker increases as the operating temperature increases, and the operating temperature must be reduced in order to reduce the failure rate. Marine Speakers Henricksen C. A. Theoretically, the heat transfer mechanism of the loudspeaker is discussed . The main reason for the fever of the loudspeaker is that the speaker's working temperature can reduce the heat of the voice coil and improve the heat of the voice coil and the magnetic circuit. The loudspeaker's thermal method is: (1) through the core, Marine Speakers positioning the film, basin frame, paper cone root, voice coil skeleton design through the larvae L to form a cooling channel. At the same time should also pay attention to prevent bad design noise generated. (2) the use of magnetic fluid, improve the voice coil cooling capacity. The method can sometimes not be used in conjunction with method (1). (3) the use of black devices, Marine Speakers improve the device's thermal radiation and thermal conductivity. (4) in the case of cost, increase the heat sink to heat. (5) For extremely high power and continuous use of the speaker, may need to use oil cooling or water cooling technology to improve reliability. (6) to improve the heat resistance of materials and adhesives. Many speaker designers will instinctively use this approach when they encounter problems, Marine Speakers but simply improving the heat resistance of materials and adhesives is not a good idea of reliability. Because the stability of the adhesive and the material may become an uncertain factor in the reliability of the speaker. Of course, the use of rubber or plastic parts, Marine Speakers still need to pay special attention to these parts of the temperature or temperature impact tolerance.
Because of the wide range of loudspeakers, Marine Speakers the reliability of the loudspeaker test method is similar, but there are some differences in the test stress and failure criteria, Marine Speakers so the author mainly from the experimental purpose, test stress and failure criteria for discussion.
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