Test equipment for actuator frequency response

In summary, the conversation is about finding a new data acquisition system to replace an old one for collecting frequency response data for a smart material actuator. The speaker is having difficulty finding a system that can run stepped sine tests and is asking for recommendations. Some suggestions include using a tracking filter or looking into commercially available test suites such as NI LabVIEW or MATLAB.
  • #1
scottike
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I am looking for a data acquisition system to replace an old Spectral Dynamics Siglab 42-20 system that I use to collect the frequency response of a smart material actuator our company manufactures. We currently run a stepped sine test between 50Hz and 2000Hz. This tests dwells at 50Hz, collects 5-10 response samples through a narrowband filter, then steps to 60Hz. The process repeats over and over until reaching 2000Hz.

I am having difficulty finding a new system to run this test. Most software seems to be written for swept sines, not stepped sines. Does anyone know of a good test suite that is capable of running stepped sine tests? Also, would a tracking filter on a swept sine work similarly to my stepped sine test? Thanks for your help!

Scott
 
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  • #2
A tracking filter could work similarly to a stepped sine test, as it would allow you to set the frequency of the filter and collect response data at each frequency. However, it may not be as accurate as a stepped sine test, as the frequency can drift over time. There are some commercially available test suites that are capable of running stepped sine tests. I would recommend looking into NI LabVIEW, which has a SignalExpress application that can be used for stepped sine testing. You can also use MATLAB for your testing, as it has a powerful signal processing library that can be used for this purpose.
 

1. What is the purpose of testing the frequency response of an actuator?

The frequency response of an actuator refers to its ability to accurately and consistently respond to input signals of varying frequencies. Testing this response is important for ensuring the actuator's performance meets desired specifications and can function properly in its intended application.

2. How is the frequency response of an actuator measured?

The frequency response of an actuator is typically measured using a test equipment called a frequency response analyzer. This device sends a range of input signals with different frequencies to the actuator, and then measures the resulting output to determine its response.

3. What factors can affect the frequency response of an actuator?

There are several factors that can affect the frequency response of an actuator, including the materials and design of the actuator, external forces or disturbances, and the environment in which the actuator is operating. It is important to consider and control these factors during testing to accurately assess the actuator's frequency response.

4. What are the potential consequences of an actuator having a poor frequency response?

A poor frequency response in an actuator can lead to a range of issues, depending on the intended application. In some cases, it may result in inaccurate or inconsistent performance, leading to errors or malfunctions in the system. In other cases, it may cause excessive wear and tear on the actuator, resulting in a shorter lifespan and increased maintenance costs.

5. How can the frequency response of an actuator be improved?

There are various ways to improve the frequency response of an actuator, such as optimizing its design and materials, implementing control systems to reduce external disturbances, and calibrating the actuator for its specific application. Proper testing and analysis of the actuator's frequency response can also provide valuable insights for improvement.

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