CN115047161A - Experimental device for online identification of length parameters of turbine mechanical blade cracks - Google Patents
Experimental device for online identification of length parameters of turbine mechanical blade cracks Download PDFInfo
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- CN115047161A CN115047161A CN202111392677.0A CN202111392677A CN115047161A CN 115047161 A CN115047161 A CN 115047161A CN 202111392677 A CN202111392677 A CN 202111392677A CN 115047161 A CN115047161 A CN 115047161A
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- rolling bearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/204—Structure thereof, e.g. crystal structure
- G01N33/2045—Defects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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Abstract
The invention provides an experimental device for identifying a crack length parameter of a blade. The invention comprises the following steps: the driving motor is fixed on the base, the output end of the driving motor is sequentially connected with the optical code strip and the elastic coupling, the elastic coupling is connected with a first rolling bearing, the first rolling bearing is connected with the rotor, the blade is connected on the blade disc, the blade disc is fixedly connected on the rotor, the other end of the rotor is connected with a second rolling bearing, the two rolling bearings are fixed on the rolling bearing bases, and the speed measuring gear is installed on the rotor; the photoelectric sensor is located the elastic coupling below and measures driver machine output shaft signal, and magnetic current sensor is located the gear below that tests the speed and measures the rotor signal, and displacement sensor is located the displacement signal of measuring the rotor on the second antifriction bearing, and photoelectric sensor, magnetic current sensor and displacement sensor connect the data acquisition appearance. The invention measures and observes the running state of the rotor under different crack parameters, and realizes the safety threshold value for identifying the crack length parameter of the blade on line.
Description
Technical Field
The invention relates to the technical field of turbine machinery fault diagnosis, in particular to an experimental device for identifying crack length parameters of a blade.
Background
A turbo machine is a rotary power machine that converts energy of a flowing working medium into mechanical work, and is a fan in an engine of an automobile or an airplane, and improves the performance of the engine by blowing fuel vapor into the engine using exhaust gas. It is one of the main components of aircraft engines, gas turbines and steam turbines, and has important economic value and safety attributes. The working environment of the turbine is generally fuel gas or working medium gas under a high-temperature and high-pressure state, so that the turbine blade not only bears alternating stress caused by expansion of the working medium, but also bears the corrosive action of the working medium gas. Under the combined action of alternating stress load and corrosive gas, the turbine blade is extremely easy to generate fatigue cracks. The occurrence of cracks not only reduces the operating efficiency of the turbomachine, but also leads to significant safety hazards. Therefore, the safe operation of the unit can be ensured by finding the blade cracks as soon as possible, and the operation cost can be greatly reduced. However, due to the complex characteristics of turbomachines, control variables are many, logical relationships are complex, and failure mechanisms of blade cracks are not easy to discover. In addition, if a destructive test is performed on the blade of the turbine unit, the whole unit is easily scrapped, and the cost of experimental research is high. Therefore, it is necessary to simplify the turbine set and build an experimental bench with clear logical relation, which is used for researching the failure mechanism of the blade crack length parameter and determining the safety threshold of the blade crack length.
Disclosure of Invention
The invention aims to provide a device for researching on-line identification of a crack failure mechanism of a turbomachine blade, and solves the safety threshold of a blade crack length parameter when a rotor-bearing-blade system operates.
The purpose of the invention is realized by the following technical scheme:
the utility model provides an experimental apparatus of online discernment of turbine machinery blade crackle length parameter which characterized in that: the device comprises a driving motor, an elastic coupling, a rotor, a rolling bearing base, a blade disc, a blade, a speed measuring gear, a base, a displacement sensor, an optical code band, a photoelectric sensor, a magnetic current sensor, a data acquisition instrument and an upper computer; the driving motor is fixed on the base, the output end of the driving motor is sequentially connected with the optical code strip and the elastic coupling, the elastic coupling is connected with a first rolling bearing, the first rolling bearing is connected with the rotor, the blade is connected on the blade disc, the blade disc is fixedly connected on the rotor, the other end of the rotor is connected with a second rolling bearing, the two rolling bearings are fixed on the rolling bearing bases, and the speed measuring gear is installed on the rotor; the photoelectric sensor is positioned below the elastic coupling and used for measuring a signal of an output shaft of the driver, the magnetic current sensor is positioned below the speed measuring gear and used for measuring a signal of the rotor, the displacement sensor is positioned above the second rolling bearing and used for measuring a displacement signal of the rotor, and the photoelectric sensor, the magnetic current sensor and the displacement sensor are connected with the data acquisition instrument; the data acquisition instrument is connected with the upper computer.
The present invention may further comprise:
1. the blade has a crack with adjustable length parameters.
2. And the running state displayed by the data acquisition instrument and the upper computer is used for representing the safety threshold of the crack length parameter of the blade.
The invention has the beneficial effects that:
according to the invention, the safety threshold value of the blade crack length parameter is identified on line by adjusting the length parameter of the blade crack according to the principle of a single variable and measuring and observing the running state of the rotor under different crack parameters.
Drawings
FIG. 1 is a schematic diagram of an online identification experimental device for a crack length parameter of a turbomachine blade.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
According to FIG. 1, an experimental device for online identification of crack length parameters of a turbomachine blade is characterized in that: the device comprises a driving motor, an elastic coupling, a rotor, a rolling bearing base, a blade disc, a blade, a speed measuring gear, a base, a displacement sensor, an optical code band, a photoelectric sensor, a magnetic current sensor, a data acquisition instrument and an upper computer; the driving motor is fixed on the base, the output end of the driving motor is sequentially connected with the optical code strip and the elastic coupling, the elastic coupling is connected with the first rolling bearing, the first rolling bearing is connected with the rotor, the blade is connected on the blade disc, the blade disc is fixedly connected on the rotor, the other end of the rotor is connected with the second rolling bearing, the two rolling bearings are fixed on the rolling bearing bases, the speed measuring gear is installed on the rotor, and the blade, the rotor and the bearings form a rotor-blade-bearing system; the photoelectric sensor is positioned below the elastic coupling and used for measuring a signal of an output shaft of the driver, the magnetic current sensor is positioned below the speed measuring gear and used for measuring a signal of the rotor, the displacement sensor is positioned above the second rolling bearing and used for measuring a displacement signal of the rotor, and the photoelectric sensor, the magnetic current sensor and the displacement sensor are connected with the data acquisition instrument; the data acquisition instrument is connected with the upper computer.
The driving motor is a 1PH8107-1DF00-2BA1 type synchronous permanent magnet motor; the controller is a VFD25AMS43ANSAA type 11Kw constant torque frequency converter;
the elastic coupling is a high-rotating-speed diaphragm coupling;
the rotor is a slender shaft flexible rotor; the bearing is a double-row ball bearing with adjustable center; the blade disc is a tightening blade disc with adjustable pretightening force; the blade is a rectangular straight blade with variable crack length parameters;
the speed measuring fluted disc and the optical code belt are used for representing the instantaneous rotating speed of the rotor;
the driving motor and the two ball bearings are respectively fixed on the corresponding bases, and the bases are fixedly connected with the ground;
the photoelectric sensor records the running state of the motor by measuring a pulse signal at the output end of the motor;
the magnetoelectric sensor is used for measuring an instantaneous rotating speed signal and recording the motion state of the rotor by measuring a pulse signal of the speed measuring gear;
the displacement sensor records the deflection state of the rotor by measuring the displacement signal of the rotor;
the data acquisition instrument and the upper computer are used for recording signals of the sensor, can record and display the data signals acquired by the sensor on line in real time, and judges the running state of the system by observing the amplitude of the signals; the blade comprises cracks with different length parameters, and when the length of the crack exceeds the limit value of safe operation of the system, the pulse signal amplitudes of the output ends of the rotor and the motor are increased sharply; at the same time, the deflection of the rotor may exceed the allowable range of motion. And taking the crack length parameter of the blade at the moment as a safety limit value under the current working condition of the system. In practical engineering, in order to ensure the safe operation of a complex rotor system, a safety limit value is multiplied by a safety factor to obtain a safety threshold value of a crack length parameter of a system blade.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The utility model provides an experimental apparatus of online discernment of turbine machinery blade crackle length parameter which characterized in that: the device comprises a driving motor, an elastic coupling, a rotor, a rolling bearing base, a blade disc, a blade, a speed measuring gear, a base, a displacement sensor, an optical code band, a photoelectric sensor, a magnetic current sensor, a data acquisition instrument and an upper computer; the driving motor is fixed on the base, the output end of the driving motor is sequentially connected with the optical code strip and the elastic coupling, the elastic coupling is connected with a first rolling bearing, the first rolling bearing is connected with the rotor, the blade is connected on the blade disc, the blade disc is fixedly connected on the rotor, the other end of the rotor is connected with a second rolling bearing, the two rolling bearings are fixed on the rolling bearing bases, and the speed measuring gear is installed on the rotor; the photoelectric sensor is positioned below the elastic coupling and used for measuring a signal of an output shaft of the driver, the magnetic current sensor is positioned below the speed measuring gear and used for measuring a signal of the rotor, the displacement sensor is positioned above the second rolling bearing and used for measuring a displacement signal of the rotor, and the photoelectric sensor, the magnetic current sensor and the displacement sensor are connected with the data acquisition instrument; the data acquisition instrument is connected with an upper computer.
2. The experimental device for online identification of the crack length parameter of the turbomachine blade according to claim 1, wherein: the blade has a crack with adjustable length parameters.
3. The experimental device for online identification of the crack length parameter of the turbomachine blade according to claim 1, wherein: and the running state displayed by the data acquisition instrument and the upper computer is used for representing the safety threshold of the crack length parameter of the blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111392677.0A CN115047161A (en) | 2021-11-23 | 2021-11-23 | Experimental device for online identification of length parameters of turbine mechanical blade cracks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111392677.0A CN115047161A (en) | 2021-11-23 | 2021-11-23 | Experimental device for online identification of length parameters of turbine mechanical blade cracks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115047161A true CN115047161A (en) | 2022-09-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111392677.0A Pending CN115047161A (en) | 2021-11-23 | 2021-11-23 | Experimental device for online identification of length parameters of turbine mechanical blade cracks |
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| Country | Link |
|---|---|
| CN (1) | CN115047161A (en) |
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2021
- 2021-11-23 CN CN202111392677.0A patent/CN115047161A/en active Pending
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