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| Analytical method | Advantages | Disadvantages |
|
| Vibration signal analysis | (i) Ability to quickly respond to changes in the state of rotating machinery | (i) It is difficult to locate equipment faults
(ii) Sensor installation location is not easy to choose
(iii) Noise signal interference is easy
(iv) The propagation path of the vibration signal is complicated, and the vibration signal at the source of the fault is not easy to collect |
| (ii) Being easy to measure and sensitive to most mechanical failures |
| (iii) Fast speed, high precision, low cost |
| (iv) Various signal processing methods |
| (v) Ability to realize online monitoring, low technical threshold |
| (vi) Being more suitable for industrial production field equipment diagnosis |
|
| Thermal imaging analysis | (i) Ability to detect electrical faults | (i) The scope of application is limited, only suitable for mechanical equipment that will produce high temperature on the surface when a failure occurs
(ii) Thermal image processing speed is slower, and software cost is higher
(iii) It is not easy to choose the installation location and distance of the collection equipment
(iv) It is vulnerable to the environment |
| (ii) Ability to achieve nondestructive testing |
| (iii) Strong recognition result against interference |
| (iv) Lower hardware cost |
| (v) Clear and intuitive test results |
|
| Acoustic signal analysis | (i) Ability to achieve nondestructive testing | (i) The quality of the acoustic signal is determined by the acquisition equipment, which has higher requirements for the equipment
(ii) It is vulnerable to environmental conditions
(iii) The installation distance of the collection equipment is not easy to determine
(iv) It is susceptible to noise
(v) It is vulnerable to the parameters of recording software |
| (ii) Short analysis time and high recognition efficiency |
| (iii) Low cost and fast speed |
| (iv) Higher sampling rate of signal acquisition |
|
| Temperature signal analysis | (i) Easiness of operation | (i) It is difficult to detect early failures of equipment
(ii) It is vulnerable to the environment
(iii) Installation location of collection equipment is not easy to choose |
| (ii) Low cost |
| (iii) High detection accuracy |
|
| Electrical signal analysis | (i) Low cost | The scope of application is limited to electrical faults |
| (ii) Easiness of operation |
| (iii) Intuitive test results |
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