[Vibration test machine] Car audio vibration test method: Vibration test is generally divided into sinusoidal sweep frequency vibration, fixed frequency vibration and random vibration. Sinusoidal sweep frequency vibration is mainly used to screen the resonance point, determine the mechanical weak link, and then use the fixed frequency. The vibration method is used as a resonance point endurance test. This is often used in the design and development of product components. Random vibration, on the other hand, applies vibration to the product over a wide frequency range. The product is stressed at different frequencies at the same time, so that many resonance points of the product are simultaneously excited, which means that components with different resonance frequencies resonate at the same time, thus The probability of damaging, colliding and damaging parts that are improperly installed increases. Therefore, in the type test of the whole product, random vibrations that can more realistically simulate the use environment of the product are often used to determine the adaptability and structural integrity of the sample to environmental stress.
The severity of the test depends mainly on the frequency range, the acceleration power spectral density, the vibration time, and the number of vibration axes. Random vibrations are also often used to express the vibration intensity using the rate-increasing root-mean value of the spectrum. In the ISO16750-3 vehicle electronic product environmental test mechanical load standard, for the car audio products, the vibration conditions shown in the following figure are often selected, and the vibration is performed for 8 hours in three axial directions, and the vibration intensity is 27.8 n/s2.
The coffee table on the market has the qualitative material such as glass, cane, woodiness, stone, metal, the price of the coffee table of different qualitative material also is different.
Marble coffee table is divided into natural marble and artificial marble, natural marble price is more expensive, buy natural marble coffee table should pay attention to the pros and cons of the product
There are two kinds of glass coffee tables. One is the hot bent glass coffee table, which is tempered after hot bending at high temperature and has a beautiful radian shape. The whole body of the coffee table is glass. Another kind is mesa is coffee table of toughened glass, complementary with modelling chic copy gold electroplating fittings and electrostatic spraying steel pipe, stainless steel and other chassis, elegant and luxurious, concise and practical. There are many shapes of glass coffee table, usually there are square glass coffee table and rectangular glass coffee table.
mirrored coffee table, crushed diamond coffee table, glass mirror coffee table, modern design coffee table
Hongsing Glass Hardware Porduct Co Ltd , https://www.hongsingglass.com