Multi-channel loading technology and application of electro-hydraulic servo fatigue testing machine in automobile manufacturing field

Popular content on Douyin platform in 2026 shows:Electro-hydraulic servo multi-channel fatigue testing machineThe search volume continues to rise, and there is a strong demand for multi-condition fatigue verification of automobile chassis structural parts such as stabilizers, axles, suspensions, and subframes.Single-channel fatigue machines are no longer able to simulate the real working conditions of complex automobile parts, and multi-channel coordinated loading has become a standard configuration in automobile manufacturing testing laboratories.

1. Technical advantages of multi-channel testing

When a car is actually driving, the chassis parts bear alternating loads in vertical, longitudinal, and lateral directions at the same time.The single-channel test can only simulate a single working condition, while the multi-channel electro-hydraulic servo system can control 2-6 actuators at the same time to accurately simulate compound working conditions such as turning, braking, and bumping.

Top apps in 2026 include:Six-channel axle fatigue test bench(simultaneously testing wheels, axles, and suspensions), four-station wheel bending/radial fatigue testing machine, and multi-channel suspension system test bench.

2. Key technical requirements for multi-channel systems

Synchronization accuracy:The phase difference error of each channel is ≤5°, and the amplitude synchronization error is ≤2%.This is the core indicator of the multi-channel system and directly affects the credibility of the test results.

Coordinated loading control:Supports force control/displacement control mixed loading, and different control modes can be used for different channels.The software needs to support roadmap playback and iterative correction.

Security protection:Multi-channel systems need to have redundant safety interlocks, and any channel abnormalities can be immediately unloaded to protect the safety of specimens and personnel.

3. Typical application scenarios

Axle fatigue test:2-4 actuators act on the left and right wheel positions respectively to simulate different road conditions.Testing standards include JT/T 1038 and OEM standards.

Suspension system test:The suspension assembly composed of springs + shock absorbers + swing arms uses multi-channel loading to simulate the dynamic characteristics of the vehicle suspension and test the damping attenuation and fatigue life.

Subframe fatigue test:Channels 4-6 simulate the force on each mounting point to verify the fatigue strength of the subframe welds.

4. Precautions for model selection (reference for purchasing decisions)

1. Channel number reservation expansion:It is recommended to choose a system architecture that supports channel expansion, initially 2 channels, and can be expanded to 6 channels in the future.

2. Oil source flow matching:When multiple channels are working at the same time, the total flow demand is large, and the oil source flow rate must be configured at 1.2 times the sum of the maximum flow rates of all actuators.

3. Actuator selection:The actuators of each channel are independently selected according to the load and stroke, and all channels do not have to be of the same specifications.

4. Software openness:Supports third-party road spectrum import, custom load spectrum programming, and fatigue damage accumulation calculation.

5. Supplier engineering capabilities:The multi-channel system has a high degree of integration. It is recommended to choose a supplier with project experience in the automotive industry and provide similar project cases.

Shandong Huayan Intelligent Equipment GroupHYYL-4000 multi-oil circuit dynamic hydraulic loading system, six-channel axle fatigue test bench, and four-station wheel fatigue testing machine have been used in many automobile manufacturing companies.As a source manufacturer of mechanical testing instruments, it has multi-channel system integration capabilities and supports non-standard tooling design and sample testing. Welcome to consult for solutions.