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Pneumatic Actuators Application in Spring

Source:http://www.flowxgroup.comUpdate Time:2014-09-23Hits:

The so-called pneumatic actuators are the machines that accept the control signal of the controller and apply the signal to the controlled object to adjust the charged volume, ensuring the stabilization of the system and good performance. Pneumatic actuators are the terminal equipments of industrial process control, relating to the safe and reliable work in the production process.

In addition to the pneumatic actuators application in spring, most of the actuators are working under the harsh environments, such as high temperature, high pressure, strong corrosion and strong interference etc. The faults of actuator can cause pause of production process and may even cause serious disasters. Of course, even the pneumatic actuators application in spring, the reliability of the actuator still plays an important role in the production safety and stable work of the whole system.

Pneumatic actuators are usually used to control fluid, gas and slurry flow and the pneumatic actuators application in spring is common. When it’s the pneumatic actuators application in spring, the pneumatic actuators have prominent advantages: low cost; high output power/weight ratio and output power/volume ratio; rapid response; being easy to maintain; being clean; being easy to get cheap drive energy, etc. As a result, the pneumatic actuators application in spring is popular in industrial process, construction machinery, according to the statistics about actuator (including pneumatic, hydraulic and electric actuator).

In recent years, the experts at home and abroad particularly take the pneumatic actuators as important end robot structures, for example, the artificial muscles are using braided pneumatic muscle physical (PMA). The length of the actuator will be reduced with the increase of internal pressure, whereas it will decrease as the internal pressure expands. The pneumatic instruments have all the traditional advantages pneumatic actuators application in spring and overcome the drawbacks of it (i.e., compliance), so it is more and more applied in robot system. As another example, the pneumatic actuators application in spring not only requires accurate positioning, but also requires accurate output force and precision assembly line of low mechanical impedance.

As modern industry has much higher requirements to the performance and reliability of system, the intelligent fault diagnosis research of pneumatic actuators application in spring is highly valued. The reliability of the actuator is a key matter that decides whether many devices can have safe production. Due to the limitation of nonlinear object modeling method and theory, and the limitation of the nonlinear system analysis and control theory, the fault diagnosis and fault-tolerant control of nonlinear system is a difficulty and a focus of research on fault diagnosis and fault-tolerant control problem.

Due to the structure and material itself, pneumatic actuators application in spring has the inherent nonlinearity, time delay, parameter drift, static friction and kinetic friction as well as electric actuators such as initial return errors. Therefore, the fault diagnosis and fault-tolerant control of pneumatic actuators application in spring is very difficult and challenging.

In view of the complex features, terrible work environment and the importance in the system, the fault diagnosis and fault-tolerant control research of pneumatic actuators has very important significance. And nonlinear objects and systems have always been difficulties and focuses of research on fault diagnosis and fault-tolerant control problem.

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