What is the Reliability of conventional hydraulic systems?

Hydraulic system has the advantages of high power, small size, light weight, fast response, high precision and high rigidity against load. Therefore, it has been widely used in many important fields such as metallurgical industry, construction machinery, aerospace, shipbuilding and so on. Hydraulic systems are often at the core of control and power transmission in various equipment and systems.Therefore, it is necessary to study the reliability of the hydraulic system.

The conventional reliability research of hydraulic system is as follows:

1. Reliability design

The reliability design of the hydraulic system is the most important part of the hydraulic reliability engineering. The concept of “reliability is by design” has been recognized by people.The main reliability design methods of hydraulic systems include redundant design, energy-saving design, environment-resistant design and simplified design.

(1) Redundant design

Redundant design uses multiple systems, and when one of them has a problem, it will be removed or isolated through fault monitoring.

Redundant design can significantly improve the reliability of the system, so that it can continue to work in the event of a failure.It is generally used in places that require the system to be “absolutely” reliable, such as aerospace, nuclear power plants, large ground power stations, etc., to ensure the mission reliability of the system.

The disadvantage is that the implementation cost is high, the control model of the system is complicated, and there is a certain limit to the improvement of system reliability.The introduction of redundant units will inevitably cause additional costs. Besides it will increase manufacturing costs, use and maintenance costs.

(2) Energy-saving design

The use of new components and new technologies to realize the energy saving of the hydraulic system can reduce the installed power and failure rate.

If a new type of energy conversion element-hydraulic transformer is used, the hydraulic transformer can adjust the flow and pressure according to the load without loss. The application of hydraulic transformer to the hydraulic system not only brings about a significant reduction in the installed power of the system, but also opens up a new way for reducing system energy consumption and simplifying the structure of the hydraulic system.

(3) Environmentally resistant design

The hydraulic system that works in special environments such as the seabed, underwater, pollution, etc., must be designed for environmental resistance.

For example, conduct theoretical and practical research on the electro-hydraulic servo platform of the underwater oil storage and supply system, design a platform-type electro-hydraulic servo system that can adaptively adjust the hull posture. And do pioneering research work of anti-corrosion and seal the hydraulic components and systems in the marine environment.

(4) Simplified Design

The simplified design can improve the basic reliability of the product. The hydraulic system should use the integrated design of pumps, valves, and tanks as much as possible to reduce pipeline connections. Use unitized and modular design as much as possible to reduce the number of product components and their mutual connections.

As far as possible to achieve the standardization, serialization and generalization of parts and components, and strive to achieve multiple functions with fewer parts and components.

2. eliability prediction

Predicting the reliability of a system is an important parameter to measure the pros and cons of a system and whether it meets the task requirements, and it is also an important means of mutual evaluation between systems.

The reliability prediction of the hydraulic system can generally be predicted by the mathematical model method plus the correction coefficient.

3. Reliability analysis

(1) Fault tree analysis

Fault tree analysis technology is widely used, especially in the fields of nuclear industry, aerospace, machinery and electronics, weapons, ships, chemical industry, etc. It plays an important role in improving the safety and reliability of products.

Fault tree analysis is gradually applied and researched in the reliability, safety, and fault analysis and diagnosis of hydraulic systems. For example, the research on the hydraulic system of crane travel is proposed, and a method of qualitative analysis of the fault tree using the minimum cut-set matrix and the calculation of structural importance is proposed. The fault tree analysis of the hydraulic system of the main cylinder of the hydraulic press is carried out, and the improvement measures of the hydraulic system are proposed based on the analysis results.

(2) GO method

GO method is a success-oriented reliability analysis method. The GO method uses the GO graph to simulate the system, and the GO graph can directly calculate the system’s success probability. For systems with multiple states and timing, it can solve the reliability problems of complex systems that are incapable of fault tree methods. For example, the GO method is used to carry out qualitative analysis and quantitative calculation of the reliability of the hydraulic system of the loader, and the reliability of the hydraulic system is quantitatively evaluated.

4. summary

With the development of hydraulic systems in the direction of rapid, high-power, and high-precision, hydraulic systems and equipment have more and more functions, structures and information are becoming more and more complex, performance indicators are getting higher and higher, and the work intensity is getting heavier and heavier. The relationship is getting closer.

This situation has brought about two results. On the one hand, productivity and product quality have been improved; on the other hand, the probability of failure has also increased.

 Once the hydraulic system fails, it will cause heavy losses. Therefore, it is of great significance to study the reliability of the hydraulic system.

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