Why must products undergo vibration tests? —— The underlying logic from hidden faults to brand lifespan
Any product, from leaving the factory to reaching the user's hands and then during daily use, cannot escape the continuous impact of "vibration": the jolts of trucks during transportation, the tossing by sorting machines, the shaking of washing machines during dehydration and the operational tremors of air - conditioning compressors during use, and even the slight squeezing from stacking in warehouses during storage. These vibrations are not "one - time damages" but chronic stress accumulations. They will gradually make the internal structures and components of the product "fatigued" until one day a sudden breakdown occurs.
For example, in the case of a mobile phone, the vibration during transportation may cause the spring leaf of the battery contact to deform slightly. After a user has used the phone for half a year, one day the phone is accidentally dropped (actually, the contact has already become loose due to the previous vibration), and the phone shuts down directly. Another example is a refrigerator. The jolts during transportation may cause tiny cracks to appear at the welded joints of the compressor pipes. After one year of use, the Freon leaks, and the user will only curse, saying, "The quality of this refrigerator is really poor." This kind of hidden fault that causes "sudden failure during use" is more terrifying than being directly broken during transportation: it will make users lose trust in the brand and even spread negative word - of - mouth, saying, "It breaks right after the warranty period. I'll never buy this brand again."
The core of solving this problem is to measure the "vibration resistance life" of products or components in advance. It's not about "whether it can withstand a single fall" but "whether it can still work normally after thousands of vibrations." At this time, vibration test equipment becomes the "medical examination device" for products, helping you detect hidden faults in advance.
Nine functions of vibration test equipment: Turn "possibly broken" into "definitely repairable"
Vibration test equipment is not an "ornamental instrument", but a tool that helps you solve the "vibration pain points" of products one by one. Each function directly corresponds to the user's usage scenarios:
1. Verify the structural strength: Avoid the situation where "it looks strong but actually cracks at the first vibration"
The plastic shell of the mobile phone uses ABS material, which gives a firm feel. However, long - term vibration will cause stress concentration at the snaps on the edges and corners. After the test equipment simulates 100,000 times of vibration, the snaps start to crack. At this time, if the snap material is replaced with PC + ABS alloy (with a 30% increase in strength), it can prevent the mobile phone shell from "automatically cracking" after half a year of use by users.
2. Detect the loosening of the connector: Prevent the situation of "screws quietly falling off and malfunctions suddenly occurring"
The screws on the screen hinge of a laptop are tightened very firmly during production. However, vibration will cause the frictional force of the threads to disappear. In the test, it was monitored that after 10,000 times of vibration, the torque of the screws decreased by 20%. Replacing them with locknuts with nylon rings or applying thread - locking glue can prevent the screen from suddenly "hanging down".
3. Evaluate the wear of protective materials: Prevent "insulation layer abrasion and short - circuit burnout of the machine"
The wires inside the rice cooker rub against the metal heating plate, and vibration will accelerate the wear of the insulation layer. By simulating friction and vibration in the test, it is found that the thickness of the insulation layer has worn from 0.5mm to 0.1mm (a short - circuit may occur at any time). Replacing it with a wear - resistant PVC insulation layer or fixing the wires with cable clamps can prevent short - circuits and burning of the appliance.
4. Find out the damaged parts: Eliminate the "transportation hazards" before the products leave the factory
The glass base of a certain table lamp may develop tiny cracks at the corners due to vibration during transportation, which users may not notice upon receipt. The base may shatter after being used for a week. In the experiment, a high - speed camera is used to record the cracking of the base. Rounding the corners in advance or tightly wrapping the base with foam can prevent damage.
5. Check for poor contact of electronic components: Solve the persistent problem of "working intermittently"
The metal contacts of the mobile phone SIM card slot will oxidize and become loose after long-term vibration. During the experiment, it was monitored that the resistance suddenly increased during vibration (indicating poor contact). Replacing them with gold-plated contacts or increasing the elasticity of the contacts can avoid the problem of "occasional signal loss".
6. Prevent circuit short - circuit: Avoid the situation of "working normally when powered on, but burning out once vibrated"
The wires of the air conditioner control panel are not fixed properly. Vibration can cause the wires to touch the metal casing - a sudden increase in current (short circuit) was detected during the test. Fixing the wires with wire troughs or pasting insulating tape on the casing can prevent short circuits.
7. Correct the deviation of the standard values of parts: Ensure "data accuracy"
The MEMS sensor of the heart rate belt will experience a zero-point shift of 0.1g (exceeding the standard value of 0.05g) due to long-term vibration. Adjusting the sensor calibration procedure or replacing it with a more stable sensor can avoid inaccurate data.
8. Screen defective parts: Keep the "defective products" out of the end of the production line
In a certain batch of earphones, 1% of the unit voice coils are not firmly glued, and noise will occur during vibration. The test equipment measures the sound quality while vibrating. As long as there is noise, the earphones will be picked out. There is no need to wait for the finished - product inspection, which saves 50% of the quality inspection time.
9. Find the resonance relationship: Make the packaging truly shock - absorbent
The natural frequency of the packaging foam for a certain type of table lamp happens to be the same as the vibration frequency of the truck (15Hz), which will amplify the vibration during transportation. After the resonance point was measured in the test, the density of the foam was changed from 20kg/m³ to 30kg/m³ to move the resonance point away from 15Hz, thus truly achieving the shock - absorption effect.
The four major benefits of using vibration test equipment: Full - link improvement from design to word - of - mouth
Vibration testing is not a cost but an investment — it can help you save money at every stage and also help you build a good reputation.
1. Design stage: Find the "breaking points" in advance to avoid mold modification in the later stage
When designing the drone, aluminum alloy was used for the frame. During the test, it was found that the frame deformed after 10,000 vibrations. Then the frame was replaced with a carbon fiber one, which was 20% lighter and 50% stronger in strength. This directly turned the "design flaw" into a "product selling point" and also saved 200,000 yuan in mold modification fees.
2. Quality control: Analyze batch differences to avoid batch defects
A certain mobile phone uses batteries from Supplier A, with a contact loosening rate of 5%; when using those from Supplier B, the loosening rate is 0.1%. Switching to Supplier B can prevent 5% of users from getting mobile phones that "easily shut down" and reduce after - sales costs by 100,000 yuan (the after - sales cost for each mobile phone is 100 yuan, so 1,000 mobile phones amount to 100,000 yuan).
3. Production stage: Measure while vibrating and pick out defective products in real time
When producing electric toothbrushes, measure the motor speed while the motor is vibrating. If the speed fluctuation of a certain motor exceeds 5% (indicating a problem with the bearing), directly pick it out instead of waiting for the finished - product inspection. As a result, the defective rate has dropped from 2% to 0.5%.
4. Durability: Make the product "indestructible" to earn a good reputation
The steel bearings of a certain electric toothbrush were found to be worn after 5,000 vibrations during the test. After replacing them with ceramic bearings, the service life was extended from 2 years to 5 years. Users find the product durable and will recommend it to their friends. The repurchase rate has increased by more than 20%, and the brand has established a durable label.
Finally: The vibration test tests "users' trust"
Nowadays, users are paying more and more attention to "durability". When buying a mobile phone, they will ask, "Can it last for 3 years?" When buying household appliances, they will check, "How many years is the warranty?" And vibration tests can help you turn "durability" into "reality". It doesn't just make the product "withstand one vibration", but makes the product "still be usable after withstanding countless vibrations".
After all, what the vibration test tests is not the "product", but the "users' trust" - the more seriously you treat the product, the more loyal the users will be to you.