Explaining the difference between hydraulic fatigue test machines and the electrodynamic equipment

servo hydraulic actuators testing machine

What is meant by fatigue test?

The basic tests were performed for measuring the reduced stiffness and strength of different materials under ongoing loading conditions to know about the ratio of the total number of load cycles to failures. Such tests are done by the various processes of cyclic loading.

Differences between the two

Though both of the machines are functionally similar, the maintenance cost of the electrodynamic machine is comparatively lower than the hydraulic test machines. Both types of machinery use the same 24-bit resolution test controller for high performance. There are remarkable differences when the electronic dynamic test machines are compared to servo-hydraulic test machines.

The servo-hydraulic system specializes in performing tests in higher force and speeds, while the electrodynamic test system specializes in test requirements that are a bit lower than the former ones.

The significant differences between the electrodynamic test machines over the servo-hydraulic test machines can be listed in terms of:

  • No leakage 
  • Usually silent or less of noise pollution
  • Energy requirements are pretty low
  • Low costs of purchase and even lower maintenance costs
  • The frequency range is low

 Here is a complete overview of the differences between the two of them.

  •  Performance individually: The basic difference that can be taken into account is relating to the performance of the machines in the context of load and displacement. The respective performance of the servo-hydraulic system can be relatively related to delivering higher force and speeds while the other one delivers low actuator-related forces.
  • Coherent problems: The servo-hydraulic system has issues relating to oil leakage at a certain level and is a noisy machine. Contrary to this, the electrodynamic systems are silent and reliable. The silent high resolution of the electrodynamic test machines ensures improvised quality and preferability in comparison to servo-hydraulic test machines. The timely developments have enhanced the possibility of encoding configuration on servo-hydraulic systems.
  •  Easy usage and stability: The competing controllers help in better resolution of the data. The additional benefit of electrodynamic actuators is the easy way of use and stability of speed.
  •  Maintenance costs: The electrodynamic solutions are cheaper than the servo-hydraulic system. Even the cost of maintenance of the former ones is much lower than the other ones.

Details about the two

Servo-hydraulic testing machines are efficiently designed, and inexpensive machines are used to test the construction material, while electrodynamic testing machines are used to do the dynamic test on construction mixtures and other materials. The electrodynamic fatigue test machines have low moving mass as a result of which provides high dynamic performance. 

The servo-hydraulic technology is older than the electrodynamic test machine. 

What is meant by a hydraulic fatigue test?

Hydraulic fatigue tests are the fatigue tests done on testing samples with a machine known as a hydraulic test machine. The respective test method analyses the behaviour of varying load material. Such types of machinery have multiple testing, pulsating, and alternative modes of testing materials. These tests have simpler stimulation of loads at various locations in respect to components of materials. If the material has lost its ductility, then it is sure to break during testing even after applying nominal stress.

Thus, it becomes easy to differentiate between the two machines.

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