Built-in-coding-information-based single sensing flexible angle-domain averaging method

A technology of encoding information and angle domain, which is applied in the field of single sensor flexible angle domain average based on built-in encoding information, can solve the problems of installing additional sensors, increasing test cost and difficulty, etc., to simplify data acquisition procedures, reduce test costs, The effect of avoiding truncation error

Active Publication Date: 2015-08-05
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the angle-domain averaging method still relies on the cooperation of the key-phase signal, which requires the installation of additional sensors and increases the cost and difficulty of testing, and its averaging algorithm cannot av

Method used

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  • Built-in-coding-information-based single sensing flexible angle-domain averaging method

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Example Embodiment

[0029] The present invention will be described in detail below in conjunction with the drawings and embodiments.

[0030] The following will take a certain planetary gearbox planetary gear fault detection test bench as an example. The test bench consists of drive motors, couplings, encoders, magnetic powder brakes, bearings, and planetary gearboxes, such as figure 1 As shown, the planetary gearbox is composed of an inner ring gear 1, a sun gear 2, and three evenly distributed planetary gears 3. The planet carrier is connected to the output shaft, and two encoders are installed on the input shaft and output shaft of the planetary gearbox At this point, the entire device is driven by a motor, which transmits torque from the input shaft along the planetary gearbox to the magnetic powder brake at the output end. The magnetic powder brake completes the loading process.

[0031] The specific parameters are as follows: 1) Rated power of drive motor: 1.2kW, rated speed: 40Hz; 2) Planetary g...

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Abstract

The utility model relates to a built-in-coding-information-based single sensing flexible angle-domain averaging method. An encoder is used for reading an angular position signal of a testing shaft in mechanical equipment; transient motion information is obtained by using a polynomial fitting method to obtain a third-order differential Jitter signal and a first-order differential rotation speed signal; fluctuation quantities of an angle-domain uniformly-spaced sampling signal and a rotation signal are calculated of the Jitter signal are calculated, a rotation speed fluctuation quantity threshold value is set to determine whether a signal is a stable one, angle-domain resampling is carried out on a non-stable signal exceeding a threshold value, and otherwise, the signal is treated as the stable one and the original j(t) signal serves as a uniform-angle-interval sampling signal; and a chirp-Z-conversion-based flexible angle domain average method is used for determining whether a fault occurs at the mechanical equipment. Therefore, the number of experiment devices is controlled to the great extent; the data acquisition procedures are simplified; the test cost is reduced; automation of fault feature extraction and diagnosis monitoring can be carried out conveniently; the time is saved; and the efficiency is high.

Description

technical field [0001] The invention relates to the technical field of mechanical equipment fault diagnosis, in particular to a single-sensing flexible angle domain averaging method based on built-in coded information. Background technique [0002] Vibration analysis is one of the most effective ways to diagnose mechanical equipment faults at this stage. In some occasions, vibration sensors are difficult to install due to environmental and working conditions. The CNC machine tool splashes a lot of metal chips and coolant during the working process, which will cause damage to the vibration sensor. For manipulators, robots and other equipment, their complex motion postures bring difficulties to the installation and wiring of vibration sensors. In addition, large-scale machining centers require a fully enclosed working environment during service, which makes it impossible to install vibration sensors. Therefore, in the case of unavailable vibration information, building a new...

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Application Information

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IPC IPC(8): G01M13/02
Inventor 林京赵明苗永浩雷亚国王琇峰
Owner XI AN JIAOTONG UNIV
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