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In the process of transportation, stable vibration usually occurs at low frequencies. At low frequencies (3-5Hz), the most serious condition of the vehicle is the vibration of the vertical acceleration value of 0.5g. In the vibration experiment, we choose the acceleration of the vibration table to be 0.5g. because of this.
â– Determine product characteristics in the second step: Impact as a design basis We need to input such things as: physical state, physical and chemical properties, to determine which packaging method to use, determine the structural characteristics of the product, such as size, weight, center of gravity, shape, etc. And the mechanical properties of the product, such as fragility, natural frequency, compressive strength, and so on.
Vibration (looking for resonance point)
It is generally believed that vibrating at a frequency that is not sensitive to the product will not damage the product. Therefore, finding the sensitive frequency (resonance point) of this product is the key to packaging design. The purpose of vibrating the product is to find the product's natural frequency or resonant frequency.
â– The third step to improve the product: Based on the crispness of the product we tested, it is sometimes better to increase the strength of the product itself than to wrap it in an expensive package. We need to make a trade-off between the cost of the product, the reliability of the product, and the cost of the packaging. Sometimes small improvements and redesigns of the product can increase the fragility of the product; although the cost of each product is slightly higher, if the cost of the product is greatly reduced, the cost of the entire package is also Relatively lower.
According to feedback from the manufacturer (or company) on the packaging design, the improvement of the product's feasibility will be greatly changed. For some companies, this feedback to package designers is an important step in the design of new products. This will enable them to have higher quality products and lower packaging costs.
â– Step 4: Assess Buffer Material Performance: Material properties should be provided by the manufacturer of the material. In special cases, these data must be measured by themselves. They include the ability of the material to absorb shocks and the transmission characteristics of vibrations.
Shock We know that the cushioning material can reduce the impact force transmitted to the product when the package is dropped. The impact cushioning curve is the description of how the impact force is transmitted through the material when different weights of goods fall onto the cushioning material. It is determined by the type, thickness, and drop height of the material.
The vibration curve of a vibration damping material describes the expansion and weakening of the vibration of the material at different frequencies, which is determined by the type and thickness of the material.
In general, the graph of the cushioning material tends to decrease as the static pressure load increases. This is determined by its buffering characteristics. As the static pressure increases, the damping force of the mass increases, and the natural frequency of the entire package decreases because the cushioning properties of the material are not changed.
Problems in Storage and Packaging Design (2)
The vibration in a real transport environment is extremely complicated. His vibration excitation is output in a frequency band in which various factors are mixed. Such vibration is usually considered as random vibration in the time domain because no one moment can be predicted. What will happen, however, from the frequency domain perspective, a vehicle can easily show extremely high levels (or strength).