CN115096530A - Static frequency testing system and testing method for turbine blade - Google Patents
Static frequency testing system and testing method for turbine blade Download PDFInfo
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- CN115096530A CN115096530A CN202210922027.0A CN202210922027A CN115096530A CN 115096530 A CN115096530 A CN 115096530A CN 202210922027 A CN202210922027 A CN 202210922027A CN 115096530 A CN115096530 A CN 115096530A
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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
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H13/00—Measuring resonant frequency
Abstract
A static frequency testing system and a testing method for a steam turbine blade belong to the technical field of steam turbine blades. The invention solves the problem that the static frequency test data of the blade is not accurate enough due to the unstable fixing mode of the blade in the static frequency test work of the static blade at present. The invention comprises a hydraulic mechanism, a supporting mechanism, an oil inlet and outlet pipe, a jack, a jacking block and a false wheel groove, wherein the hydraulic mechanism is connected with the jack through the oil inlet and outlet pipe, the false wheel groove is arranged on the supporting mechanism, a blade root of a blade is assembled in the false wheel groove, the jack is arranged below the false wheel groove, the actuating end of the jack is connected with the jacking block, the jacking block penetrates through the supporting mechanism and is arranged in the false wheel groove, and the jacking block is abutted against the blade root of the blade. The static frequency testing system improves the fixed stability of the blade during static frequency testing, and enables the data obtained by the static frequency testing of the blade to be more accurate and stable.
Description
Technical Field
The invention relates to the technical field of turbine blades, in particular to a static frequency testing system and a static frequency testing method for a turbine blade.
Background
After the turbine blade is machined, in order to check the consistency of the machining quality of each blade, blade weighing, weight moment testing and static frequency testing are required to be carried out on the blade, wherein the static frequency of the blade reflects the quality and rigidity of the blade structure, and the stability of the dispersion degree of the static frequency brings important guarantee to the stability of the dynamic frequency of the blade. However, the static frequency testing method and the fixing structure of the turbine blade at present are various, the static frequency testing is performed by fixing the blade by using a vice, and the static frequency testing is performed after the blade is fixed in a non-contact manner, which brings serious influence on the stability and accuracy of the static frequency of the blade.
In view of the above problems, a need exists for a turbine blade static frequency testing system that has a stable fixed structure when the blade performs static frequency testing and improves the accuracy and stability of the blade static frequency testing data.
Disclosure of Invention
The present invention has been developed in order to solve the problem of the present static frequency test work for stationary blades being unstable with respect to the manner of fixing the blades, resulting in the static frequency test data of the blades being less accurate, and a brief summary of the present invention is provided below in order to provide a basic understanding of some aspects of the present invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to determine the key or important part of the present invention, nor is it intended to limit the scope of the present invention.
The technical scheme of the invention is as follows:
the first scheme is as follows: a static frequency testing system for a turbine blade comprises a hydraulic mechanism, a supporting mechanism, an oil inlet and outlet pipe, a jack, a top block and a false wheel groove, wherein the hydraulic mechanism is connected with the jack through the oil inlet and outlet pipe;
still include the static frequency accredited testing organization, the static frequency accredited testing organization includes the modal power hammer, acceleration sensor, spectrum analysis appearance hardware portion and spectrum analysis appearance software portion, acceleration sensor is connected with the blade, the modal power hammer carries out the single-point excitation to the blade, spectrum analysis appearance hardware portion establishes with modal power hammer and acceleration sensor respectively and is connected, spectrum analysis appearance hardware portion is used for collecting the vibration signal of blade, spectrum analysis appearance software portion is integrated in spectrum analysis appearance hardware portion, spectrum analysis appearance software portion obtains the frequency response function with the vibration signal analysis that spectrum analysis appearance hardware portion collected.
Furthermore, the hydraulic mechanism comprises a hydraulic pump, an oil tank and a pressure gauge, the hydraulic pump is connected with the oil tank, the oil tank is connected with the pressure gauge, and the hydraulic pump is connected with the jack through an oil inlet pipe and an oil outlet pipe.
Further, the supporting mechanism comprises a first supporting portion, a second supporting portion, a third supporting portion and a base platform, the second supporting portion and the third supporting portion are symmetrically arranged on the base platform, the first supporting portion is installed on the base platform through the second supporting portion and the third supporting portion, the false wheel groove is formed in the first supporting portion, a second square hole is machined in the first supporting portion, a first square hole is machined in the false wheel groove, the first square hole is vertically aligned with the second square hole, and the jacking block sequentially penetrates through the second square hole and the first square hole and is arranged in the false wheel groove.
Furthermore, a plurality of first through holes are processed on the false wheel groove, a plurality of second through holes are processed on the first supporting part, a plurality of threaded holes are processed on the base platform, the first through holes, the second through holes and the threaded holes are coaxially arranged, and the bolts sequentially penetrate through the first through holes and the second through holes to be in threaded connection with the threaded holes of the base platform.
Furthermore, the first supporting part, the second supporting part, the third supporting part and the base platform are connected in a welding mode.
Scheme two is as follows: the testing method of the static frequency testing system for the steam turbine blade based on the scheme I comprises the following steps of:
the method comprises the following steps: welding the first supporting part, the second supporting part, the third supporting part and the base platform into a whole in a welding mode, then placing the base platform in a test field, and fixing the false wheel groove on the first supporting part through a bolt;
step two: placing a jack on the base platform, aligning the output end of the jack with the first square hole and the second square hole, placing an ejector block in a false wheel groove by penetrating the second square hole and the first square hole, contacting the output end of the jack with the ejector block, and assembling the blade root of the blade into the wheel groove of the false wheel groove;
step three: the hydraulic pump is respectively connected with the oil tank and the pressure gauge, an oil inlet pipe and an oil outlet pipe are connected between the hydraulic pump and the jack, the hydraulic pump is started to enable the jack to jack the jacking block, the jacking block jacks the bottom of the blade root of the blade, the contact surface of the blade root and the wheel groove of the false wheel groove is subjected to extrusion force, the blade is fixed under the determined supporting load, and the pressure gauge is used for monitoring the pressure of the hydraulic pump;
step four: bond acceleration sensor on the blade, acceleration sensor is connected to on the spectral analysis appearance hardware portion, connect the modal power hammer in the spectral analysis appearance hardware portion, carry out the single-point excitation to the blade through the modal power hammer, adopt acceleration sensor to carry out the single-point and pick up the vibration, transmit vibration signal for spectral analysis appearance hardware portion and realize signal low pass filtering and analog-to-digital conversion, spectral analysis appearance hardware portion transmits the vibration digital signal of record for spectral analysis appearance software portion and carries out spectral analysis and obtain the frequency response function, acquire the static frequency of blade according to the frequency response function.
The invention has the following beneficial effects:
1. according to the static frequency testing system and method for the turbine blade, the blade is accurately and reasonably fixed in the false wheel groove by adopting the hydraulic mechanism, the jack and the jacking block, so that the stability of fixing the blade in the static frequency testing of the turbine blade is improved, and the data obtained by the blade in the static frequency testing is accurate and stable;
2. the static frequency testing system and the testing method for the turbine blade provided by the invention are used for obtaining the static frequency of the turbine blade in a spectrum analyzer system by exciting the modal force hammer and picking up the signal of the acceleration sensor, and are a set of convenient, stable and accurate static frequency testing system for the turbine blade.
Drawings
FIG. 1 is a schematic diagram of an overall static frequency testing system for a steam turbine blade;
FIG. 2 is a schematic diagram of the engagement of the hydraulic mechanism with the jack;
FIG. 3 is a schematic view of the supporting mechanism and the dummy wheel groove;
FIG. 4 is a schematic view of a false wheel groove structure;
FIG. 5 is a schematic view of the first support;
FIG. 6 is a schematic structural view of a base platform;
FIG. 7 is a schematic diagram of a static frequency testing mechanism;
in the figure, 1-a hydraulic mechanism, 2-a supporting mechanism, 3-a static frequency testing mechanism, 1.1-a hydraulic pump, 1.2-an oil tank, 1.3-a pressure gauge, 1.4-an oil inlet and outlet pipe, 1.5-a jack, 1.6-a top block, 2.1-a bolt, 2.2-a false wheel groove, 2.3-a first supporting part, 2.4-a second supporting part, 2.5-a third supporting part, 2.6-a base platform, 2.7-a first square hole, 2.8-a second square hole, 2.9-a first through hole, 2.10-a second through hole, 2.11-a threaded hole, 3.1-a modal force hammer, 3.2-an acceleration sensor, 3.3-a blade, 3.4-a spectrum analyzer hardware part and 3.5-a spectrum analyzer software part.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The connection mentioned in the present invention is divided into a fixed connection and a detachable connection, the fixed connection (i.e. the non-detachable connection) includes but is not limited to a folding connection, a rivet connection, an adhesive connection, a welding connection, and other conventional fixed connection methods, the detachable connection includes but is not limited to a screw connection, a snap connection, a pin connection, a hinge connection, and other conventional detachment methods, when the specific connection method is not clearly defined, the function can be realized by always finding at least one connection method from the existing connection methods by default, and a person skilled in the art can select the connection method according to needs. For example: the fixed connection selects welding connection, and the detachable connection selects hinge connection.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
Embodiment 1, the present embodiment is described with reference to fig. 1 to 7, and the static frequency testing system for a turbine blade of the present embodiment includes a hydraulic mechanism 1, a supporting mechanism 2, an oil inlet and outlet pipe 1.4, a jack 1.5, a top block 1.6 and a false wheel groove 2.2, the hydraulic mechanism 1 is connected to the jack 1.5 through the oil inlet and outlet pipe 1.4, the supporting mechanism 2 is provided with the false wheel groove 2.2, a blade root of the blade 3.3 is assembled in the false wheel groove 2.2, the jack 1.5 is arranged below the false wheel groove 2.2, an actuating end of the jack 1.5 is connected to the top block 1.6, the top block 1.6 is arranged in the false wheel groove 2.2 through the supporting mechanism 2, the abutting blade root of the top block 1.6 and the blade 3.3, the blade 3.3 is connected to the static frequency testing mechanism 3, the static frequency testing mechanism 3 is used for collecting the static frequency of the blade 3.3, in the present embodiment, the top block 1.6 has a height of 150mm, a fixed wheel groove with a length of 20mm and a width of 35mm, and a fixed wheel groove for the false wheel groove 2.3, a false wheel groove 2.2 is 107mm high, 253mm long and 200mm wide, and a wheel groove is milled in the width direction according to the wheel groove profile line and is used for assembling a blade 3.3;
the hydraulic mechanism 1 comprises a hydraulic pump 1.1, an oil tank 1.2 and a pressure gauge 1.3, the hydraulic pump 1.1 is connected with the oil tank 1.2, the oil tank 1.2 is connected with the pressure gauge 1.3, the hydraulic pump 1.1 is connected with a jack 1.5 through an oil inlet and outlet pipe 1.4, power is provided by the hydraulic pump 1.1, hydraulic oil in the oil tank 1.2 is transmitted to the jack 1.5 through the oil inlet and outlet pipe 1.4, the jack 1.5 drives a top block 1.6 to fix a blade root of the blade 3.3 in a false wheel groove 2.2, the pressure of the hydraulic pump is detected through the pressure gauge 1.3, the condition that the blade root of the blade 3.3 is damaged due to overhigh pressure output by the jack 1.5 is avoided, and the blade root of the blade 3.3 is fixed under a determined supporting load is avoided;
the supporting mechanism 2 comprises a first supporting part 2.3, a second supporting part 2.4, a third supporting part 2.5 and a base platform 2.6, the second supporting part 2.4 and the third supporting part 2.5 are symmetrically arranged on the base platform 2.6, the first supporting part 2.3 is arranged on the base platform 2.6 through the second supporting part 2.4 and the third supporting part 2.5, a false wheel groove 2.2 is arranged on the first supporting part 2.3, a second square hole 2.8 is processed on the first supporting part 2.3, a first square hole 2.7 is processed on the false wheel groove 2.2, the first square hole 2.7 is longitudinally aligned with the second square hole 2.8, a top block 1.6 sequentially passes through the second square hole 2.8 and the first square hole 2.7 and is arranged in the false wheel groove 2.2, the first supporting part 2.3, the second supporting part 2.4, the third supporting part 2.5 and the base platform 2.6 are connected in a welding manner, the second supporting part 2.4 is connected with the third supporting part 2.5, the cuboid structure has the same height as that the third supporting part 2.5, the cuboid structure is 200mm and the cuboid structure is 100mm, the bottom platform 2.6 is a cuboid with the height of 80mm, the length of 633mm and the width of 400mm, the first support 2.2 is a cuboid with the height of 80mm, the length of 433mm and the width of 200mm, a second square hole 2.8 with the height of 80mm, the length of 20mm and the width of 35.5mm is bored in the height direction of the center position of the first support 2.3, a first square hole 2.7 with the height of 150mm, the length of 20mm and the width of 35.5mm is bored in the height direction of the center position of the false wheel groove 2.2, four first through holes 2.9 with the diameter of 36.5mm are bored in the height direction of the false wheel groove 2.2, four second through holes 2.10 with the diameter of 36.5mm are bored in the corresponding positions of the first support 2.2, four threaded holes 2.11 with the diameter of 36mm are bored in the corresponding positions of the base platform 2.6, and bolts 2.1 sequentially pass through the first through holes 2.9 and the second through holes 2.10 to be connected with the threaded holes 2.6 of the base platform 2.6, and the bolt 2.11 is a bolt with the length of 36mm, and the length of 36 mm;
the static frequency testing mechanism 3 comprises a modal force hammer 3.1, an acceleration sensor 3.2, a spectrum analyzer hardware part 3.4 and a spectrum analyzer software part 3.5, wherein the acceleration sensor 3.2 is connected with blades 3.3, the modal force hammer 3.1 performs single-point excitation on the blades 3.3, the spectrum analyzer hardware part 3.4 is respectively connected with the modal force hammer 3.1 and the acceleration sensor 3.2, the spectrum analyzer hardware part 3.4 is used for collecting vibration signals of the blades 3.3, the spectrum analyzer software part 3.5 is integrated with the spectrum analyzer hardware part 3.4, the spectrum analyzer software part 3.5 analyzes the vibration signals collected by the spectrum analyzer hardware part 3.4 to obtain a frequency response function, the spectrum analyzer hardware part 3.4 is an LMS data collecting device, and the spectrum analyzer software part 3.5 is an LMS modal analysis system.
the method comprises the following steps: welding the first supporting part 2.3, the second supporting part 2.4, the third supporting part 2.5 and the base platform 2.6 into a whole in a welding mode, placing the whole on a test site, and fixing the false wheel groove 2.2 on the first supporting part 2.3 through a bolt 2.1;
step two: placing a jack 1.5 on a base platform 2.6, aligning the output end of the jack 1.5 with a first square hole 2.7 and a second square hole 2.8, placing a top block 1.6 in a false wheel groove 2.2 through the second square hole 2.8 and the first square hole 2.7, contacting the output end of the jack 1.5 with the top block 1.6, and assembling the blade root of a blade 3.3 in the wheel groove of the false wheel groove 2.2;
step three: the method comprises the following steps of respectively connecting a hydraulic pump 1.1 with an oil tank 1.2 and a pressure gauge 1.3, connecting an oil inlet and outlet pipe 1.4 between the hydraulic pump 1.1 and a jack 1.5, starting the hydraulic pump 1.1 to enable the jack 1.5 to jack a jack block 1.6, enabling the jack block 1.6 to jack the bottom of a blade root of a blade 3.3, enabling a contact surface of the blade root and a wheel groove of a false wheel groove 2.2 to be subjected to extrusion force, fixing the blade 3.3 at a determined supporting load, and monitoring the pressure of the hydraulic pump 1.1 through the pressure gauge 1.3;
step four: bonding an acceleration sensor 3.2 on a blade 3.3, connecting the acceleration sensor 3.2 to a hardware part 3.4 of a spectrum analyzer, connecting a modal force hammer 3.1 to the hardware part 3.4 of the spectrum analyzer, performing single-point excitation on the blade 3.3 through the modal force hammer 3.1, performing single-point vibration pickup by adopting the acceleration sensor 3.2, transmitting a vibration signal to the hardware part 3.4 of the spectrum analyzer to realize signal low-pass filtering and analog-to-digital conversion, transmitting a recorded vibration digital signal to a software part 3.5 of the spectrum analyzer by the hardware part 3.4 of the spectrum analyzer to analyze the vibration digital signal to obtain a frequency response function, and obtaining the static frequency of the blade 3.3 according to the frequency response function;
the static frequency testing mechanism 3 adopts a data acquisition device, a force hammer, a modal analysis system and an acceleration sensor to obtain a frequency response function, and the frequency response function determines the static frequency of the blade;
the fourth step of obtaining the static frequency of the blade 3.3 through the hardware part 3.4 of the spectrum analyzer and the software part 3.5 of the spectrum analyzer comprises the following specific steps: :
1. filtering out high-frequency components through a low-pass and analog filter;
2. the analog-to-digital converter (ADC) must set the appropriate voltage range;
3. requiring the response signal to decay to zero during the sampling period;
4. after the acquisition is finished, time domain signals of all measuring points are checked;
5. two important functions for obtaining modal data are calculated by FFT fast Fourier transform on time domain signals: frequency Response Function (FRF) and coherence function.
For a single degree of freedom system, the frequency response function can be expressed as:
accordingly, the relationship between the measured value of the FRF with multiple degrees of freedom and the modal parameter is:
wherein:
h ij (ω): freedom of responseFRF between degree i and reference degree of freedom j;
n: the vibration mode number influencing the dynamic response of the structure in the analysis frequency band;
r ijk : the residue of the kth order mode;
λ k : a pole of the kth order mode;
the frequency response function, which contains information about the frequency and damping of the system, whose peaks occur at the resonant frequency of the system, can be used to determine the blade static frequency.
The present embodiment is only illustrative of the patent and does not limit the scope of protection thereof, and those skilled in the art can make modifications to the part thereof without departing from the spirit of the patent.
Claims (6)
1. A static frequency test system for a steam turbine blade, comprising: the hydraulic lifting jack comprises a hydraulic mechanism (1), a supporting mechanism (2), an oil inlet and outlet pipe (1.4), a jack (1.5), a top block (1.6) and a false wheel groove (2.2), wherein the hydraulic mechanism (1) is connected with the jack (1.5) through the oil inlet and outlet pipe (1.4), the supporting mechanism (2) is provided with the false wheel groove (2.2), the blade root of a blade (3.3) is assembled in the false wheel groove (2.2), the jack (1.5) is arranged below the false wheel groove (2.2), the actuating end of the jack (1.5) is connected with the top block (1.6), the top block (1.6) penetrates through the supporting mechanism (2) and is arranged in the false wheel groove (2.2), and the top block (1.6) is abutted to the blade root of the blade (3.3);
the device is characterized by further comprising a static frequency testing mechanism (3), wherein the static frequency testing mechanism (3) comprises a modal force hammer (3.1), an acceleration sensor (3.2), a spectrum analyzer hardware part (3.4) and a spectrum analyzer software part (3.5), the acceleration sensor (3.2) is connected with a blade (3.3), the modal force hammer (3.1) performs single-point excitation on the blade (3.3), the spectrum analyzer hardware part (3.4) is respectively connected with the modal force hammer (3.1) and the acceleration sensor (3.2), the spectrum analyzer hardware part (3.4) is used for collecting vibration signals of the blade (3.3), the spectrum analyzer software part (3.5) is integrated with the spectrum analyzer hardware part (3.4), and the spectrum analyzer software part (3.5) analyzes the vibration signals collected by the spectrum analyzer hardware part (3.4) to obtain a frequency response function.
2. The system for testing the static frequency of a steam turbine blade of claim 1, wherein: the hydraulic mechanism (1) comprises a hydraulic pump (1.1), an oil tank (1.2) and a pressure gauge (1.3), the hydraulic pump (1.1) is connected with the oil tank (1.2), the oil tank (1.2) is connected with the pressure gauge (1.3), and the hydraulic pump (1.1) is connected with a jack (1.5) through an oil inlet and outlet pipe (1.4).
3. The system for static frequency testing of steam turbine blades according to claim 2, wherein: the supporting mechanism (2) comprises a first supporting portion (2.3), a second supporting portion (2.4), a third supporting portion (2.5) and a base platform (2.6), the second supporting portion (2.4) and the third supporting portion (2.5) are symmetrically arranged on the base platform (2.6), the first supporting portion (2.3) is installed on the base platform (2.6) through the second supporting portion (2.4) and the third supporting portion (2.5), a false wheel groove (2.2) is formed in the first supporting portion (2.3), a second square hole (2.8) is machined in the first supporting portion (2.3), a first square hole (2.7) is machined in the false wheel groove (2.2), the first square hole (2.7) is longitudinally aligned with the second square hole (2.8), and the jacking block (1.6) sequentially penetrates through the second square hole (2.8) and the first square hole (2.7) to be arranged in the false wheel groove (2.2.6).
4. A static frequency testing system for a steam turbine blade according to claim 3, wherein: processing has a plurality of first through-holes (2.9) on false race (2.2), processing has a plurality of second through-holes (2.10) on first supporting part (2.3), processing has a plurality of screw holes (2.11) on base platform (2.6), first through-hole (2.9), second through-hole (2.10) and screw hole (2.11) coaxial arrangement, screw bolt (2.1) pass first through-hole (2.9) and second through-hole (2.10) and screw hole (2.11) threaded connection of base platform (2.6) in proper order.
5. A static frequency testing system for a steam turbine blade according to claim 3, wherein: the first supporting part (2.3), the second supporting part (2.4), the third supporting part (2.5) and the base platform (2.6) are connected in a welding mode.
6. The method of testing a static frequency testing system for steam turbine blades according to claim 4, comprising the steps of:
the method comprises the following steps: welding the first supporting part (2.3), the second supporting part (2.4), the third supporting part (2.5) and the base platform (2.6) into a whole in a welding mode, then placing the whole on a test site, and fixing the false wheel groove (2.2) on the first supporting part (2.3) through a bolt (2.1);
step two: placing a jack (1.5) on a base platform (2.6), aligning the output end of the jack (1.5) with a first square hole (2.7) and a second square hole (2.8), placing a jacking block (1.6) in a false wheel groove (2.2) through the second square hole (2.8) and the first square hole (2.7), contacting the output end of the jack (1.5) with the jacking block (1.6), and assembling the blade root of a blade (3.3) in the wheel groove of the false wheel groove (2.2);
step three: the method comprises the following steps that a hydraulic pump (1.1) is respectively connected with an oil tank (1.2) and a pressure gauge (1.3), an oil inlet and outlet pipe (1.4) is connected between the hydraulic pump (1.1) and a jack (1.5), the hydraulic pump (1.1) is started to enable the jack (1.5) to jack a jacking block (1.6), the jacking block (1.6) jacks the bottom of a blade root of a blade (3.3), the contact surface of the blade root and a wheel groove of a false wheel groove (2.2) is subjected to extrusion force, the blade (3.3) is fixed at a determined supporting load, and the pressure of the hydraulic pump (1.1) is monitored through the pressure gauge (1.3);
step four: the method comprises the steps of adhering an acceleration sensor (3.2) to a blade (3.3), connecting the acceleration sensor (3.2) to a spectrum analyzer hardware part (3.4), connecting a modal force hammer (3.1) to the spectrum analyzer hardware part (3.4), conducting single-point excitation on the blade (3.3) through the modal force hammer (3.1), conducting single-point vibration pickup by adopting the acceleration sensor (3.2), transmitting vibration signals to the spectrum analyzer hardware part (3.4) to achieve signal low-pass filtering and analog-to-digital conversion, transmitting recorded vibration digital signals to a spectrum analyzer software part (3.5) by the spectrum analyzer hardware part (3.4) to conduct spectrum analysis to obtain a frequency response function, and obtaining the static frequency of the blade (3.3) according to the frequency response function.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210922027.0A CN115096530A (en) | 2022-08-02 | 2022-08-02 | Static frequency testing system and testing method for turbine blade |
| PCT/CN2023/077069 WO2024027135A1 (en) | 2022-08-02 | 2023-02-20 | Static frequency test system and method for steam turbine blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210922027.0A CN115096530A (en) | 2022-08-02 | 2022-08-02 | Static frequency testing system and testing method for turbine blade |
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| CN115096530A true CN115096530A (en) | 2022-09-23 |
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| CN202210922027.0A Pending CN115096530A (en) | 2022-08-02 | 2022-08-02 | Static frequency testing system and testing method for turbine blade |
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| WO (1) | WO2024027135A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024027135A1 (en) * | 2022-08-02 | 2024-02-08 | 哈电发电设备国家工程研究中心有限公司 | Static frequency test system and method for steam turbine blade |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101949731B (en) * | 2010-08-13 | 2011-12-14 | 株洲时代新材料科技股份有限公司 | Method for testing high-order frequency of large wind-power blades |
| CN102564561A (en) * | 2010-12-30 | 2012-07-11 | 沈阳黎明航空发动机(集团)有限责任公司 | Test method for natural frequency of blade of integral blade disc |
| CN108318200A (en) * | 2018-01-10 | 2018-07-24 | 东方电气集团东方汽轮机有限公司 | A kind of Static Leaf vibration frequency test system and its application method |
| CN115096530A (en) * | 2022-08-02 | 2022-09-23 | 哈电发电设备国家工程研究中心有限公司 | Static frequency testing system and testing method for turbine blade |
| CN217738601U (en) * | 2022-08-02 | 2022-11-04 | 哈电发电设备国家工程研究中心有限公司 | Static frequency testing system for turbine blade |
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- 2022-08-02 CN CN202210922027.0A patent/CN115096530A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024027135A1 (en) * | 2022-08-02 | 2024-02-08 | 哈电发电设备国家工程研究中心有限公司 | Static frequency test system and method for steam turbine blade |
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