Hydraulic Drive for Fatigue Tests Using Dual Piston Segmentation
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Solution Overview
Problem
Conventional hydraulic drives for fatigue tests require high power due to the need for large servo-actuators to apply both static and dynamic loads, leading to high energy consumption and complex systems.
Innovation Solution
A hydraulic drive system utilizing a multiple cylinder configuration with two pistons, where one piston applies a static load and the other applies a dynamic load, with the pistons being connected via a piston rod and controlled by separate hydraulic partial controls, reducing energy requirements and simplifying the control method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large servo-actuator is used to sustain both static and dynamic loads, then the load capacity is sufficient, but the power requirement and energy consumption increase significantly
Solution Approach 1:
The patent divides the single servo-actuator into two separate actuators: one dedicated to sustaining the static load and another for applying the dynamic load. This segmentation allows each actuator to be optimized for its specific function, reducing the overall power requirement since the static load actuator does not need to cycle continuously
Solution Approach 2:
The first actuator is designed to perform the universal function of sustaining the static component of the load throughout the entire test duration, while the second actuator handles the dynamic component. This functional separation enables more efficient energy usage overall
2Device complexity
If a single servo-actuator is used to generate both mean load and alternating load, then the system structure is simpler, but the power requirement increases due to continuous oil flow needs
Solution Approach 1:
The hydraulic system is segmented into two independent control circuits: one for the static load actuator and one for the dynamic load actuator. This allows the static actuator to maintain pressure without continuous pump operation, reducing overall power requirements
3Force
If a large servo-actuator is used to sustain static load, then the static load capacity is adequate, but the oil flow requirement for dynamic loading increases energy consumption
Solution Approach 1:
By separating the static and dynamic load functions into different actuators, the system eliminates the energy waste associated with a large actuator continuously cycling. The static actuator maintains load without requiring dynamic oil flow, while only the smaller dynamic actuator requires continuous pumping during cyclic operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the overall energy consumption and simplifies the control of hydraulic drives for fatigue tests, achieving lower power requirements and more efficient load application with minimal additional pressure medium needed, while maintaining accurate load control.
Implementation Method 1
pressure medium can be applied to a first piston to sustain a static load; simultaneously or subsequently pressure medium can be applied to a second piston alternately in opposite directions so that a dynamic load is generated
Data Source
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AI summary
The invention discloses a hydraulic drive for load tests and/or material fatigue tests. The hydraulic drive comprises a double cylinder including two pistons connected via a piston rod. A static load can be sustained via the first piston and a dynamic load can be controlled by the second piston.