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Posted on Aug 26, 20205
The primary function of a spring shock absorber is to absorb and dissipate the kinetic energy of the impact to such an extent that the acceleration acting on the airframe is reduced to an acceptable level. Existing shock absorbers can be divided into two classes depending on the type of spring used: those using a full spring made of steel or rubber, and those using a liquid spring with gas or oil, or a mixture of both, which are generally referred to as pneumatic.
The high efficiency of the gearbox and the weight associated with the hydraulic shock absorber make it the preferred design for commercial transport. Based on the presented analytical procedure, algorithms were developed to determine the required stroke and length of the piston to meet the given design conditions, as well as the energy absorption capacity of the shock absorber.
Spring shock absorbers have high efficiency under dynamic conditions. Both in terms of energy absorption and dispersion are provided by compressed air and oil cylinder. Single-acting shock absorber, which is the most commonly used structure in commercial transport, is a type of damper that absorbs energy, forcing the oil chamber to counteract first dry air or nitrogen chambers, then compressing the gas and oil. During compression, oil and gas remain separate or are mixed depending on the type of project. After the initial impact, the energy is dissipated as air pressure is forced oil back into the chamber through the jet holes.
Although the compression hole may only be a hole in the orifice plate, most designs have a measurement pin going through it, while the diameter of the hole is varied. This variation is adjusted so that the column loading is fairly constant under dynamic loading. If this could be made constants, the efficiency of the gearbox would be 100 percent. In practice, this is never achieved, and efficiencies of 80 to 90 percent are more common. Since only the efficiency factor is interesting at the conceptual design stage, there are no additional ones a discussion of stylus design will be provided.
:: Read more : Industrial Shock Absorbers – Types and Applications
There are many different shock absorber designs available, but the basic operation of each is the same. Dampers are basically multi-chamber cylinders with one or more openings between the chambers. When an object hits the cylinder piston rod, the inner piston moves as it increases fluid pressure in the cylinder. The fluid flows through the holes, lowering the pressure and increasing the temperature. In this way, the kinetic energy of a moving object is converted into heat when it is stopped.
The efficiency and effectiveness of the canister depend almost entirely on the leakage path between the two sides of the cylinder. However, the ability to absorb energy depends on the size of the damper and how the piston returns to its rest position. Spring return shock absorbers are more compact and comfortable than models with external batteries but do not have as much energy capacity.
The adjustable shock absorbers are equipped with a series of orifice holes along the entire length of the metal tube. The slotted dispensing tube, which fits over the stationary tube, can be rotated with the outer ring to adjust the total effective area and desired release speed.
As the measuring tube is rotated towards the open position, shock provides maximum bore area and minimum resistance. Conversely, the movement towards the closed position reduces the area of the opening and increases resistance. This method of adjustment enables the handling of heavyweights or high driving forces with low viscosities.
Adjustable shock absorbers overcome the main disadvantage of hydro-shock by adapting the orification to non-standard input conditions. Therefore, a properly adjusted damper can produce the same almost perfect deceleration as a hydroshock. The main advantage of the damper is the ability to cope with a wide range of input conditions; its main disadvantage is that it has to be manually adjusted every time the input condition changes.
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