CN109540435A - A kind of machinery couples the blade fatigue test system and method for exciting with sound wave - Google Patents
A kind of machinery couples the blade fatigue test system and method for exciting with sound wave Download PDFInfo
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- CN109540435A CN109540435A CN201811408428.4A CN201811408428A CN109540435A CN 109540435 A CN109540435 A CN 109540435A CN 201811408428 A CN201811408428 A CN 201811408428A CN 109540435 A CN109540435 A CN 109540435A
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- blade
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to blade fatigue test technical fields, the blade fatigue test system that a kind of machinery couples exciting with sound wave is provided, it include: blade, blade mounting and clamping system including fixture, electromagnetic exciting system including electromagnetic vibration generator system, sound wave excitation system including signal generator, the first power amplifier and loudspeaker, sonic test system including microphone, the second power amplifier and the first Signal Analysis System, the stress test system including foil gauge, dynamic strain indicator and second signal analysis system.The present invention also provides a kind of methods for carrying out blade fatigue test using above system, adjustment signal generator output frequency first is to blade resonance frequency, adjust again the first power amplifier to acoustic pressure reach adB, adjustment electromagnetic vibration generator system to blade vibration stress reach b MPa, by stress test system to coupling exciting under blade vibration stress measure.The present invention can consider mechanical load and influence of the sound wave load to blade strength, test result high reliablity simultaneously.
Description
Technical field
The present invention relates to blade fatigue test technical fields, more particularly to a kind of mechanical blade for coupling exciting with sound wave
Fatigue test system and method.
Background technique
Blade needs to carry out a large amount of fatigue behaviour certification test during development, troubleshooting.The exciting form of fatigue test
There are many, such as electromagnetic exciting, loudspeaker exciting, gas pulses exciting.
In current blade of aviation engine fatigue test system both at home and abroad and method, electromagnetic exciting is mostly used greatly, that is, is used
Electromagnetic vibration generator system carries out the fatigue strength examination of blade as the unique exciting source of blade, and has ignored engine real work
The influence to blade strength such as middle sound wave load, aerodynamic loading.
As it can be seen that existing blade fatigue test system and method, does not account for other loads such as sound wave in addition to mechanical load
Influence of the lotus to blade strength, to be unable to satisfy the fatigue test of particular/special requirement blade.
Summary of the invention
In view of the problems of the existing technology, the present invention provides the blade fatigue test that a kind of machinery couples exciting with sound wave
System and method can consider mechanical load and influence of the sound wave load to blade strength simultaneously, additionally it is possible to which satisfaction has special want
Ask the fatigue test of blade, and test result high reliablity.
The technical solution of the present invention is as follows:
A kind of machinery couples the blade fatigue test system of exciting with sound wave, it is characterised in that: including blade, blade clamping
System, electromagnetic exciting system, sound wave excitation system, sonic test system, stress test system；
The blade mounting and clamping system includes fixture, and the electromagnetic exciting system includes electromagnetic vibration generator system, the sound wave exciting
System includes signal generator, the first power amplifier and loudspeaker, and the sonic test system includes microphone, the second power
Amplifier and the first Signal Analysis System, the stress test system include foil gauge, dynamic strain indicator and second signal analysis
System；
It is rigidly connected between the blade and electromagnetic vibration generator system by fixture, the electromagnetic vibration generator system and signal generator electricity
Connection, the signal generator is successively electrically connected with the first power amplifier, loudspeaker, the microphone successively with the second power
Amplifier, the electrical connection of the first Signal Analysis System, the foil gauge connect with blade, the foil gauge successively with dynamic strain
Instrument, the electrical connection of second signal analysis system.
The foil gauge is resistance strain gage.
The foil gauge and blade are attached by glue.
The electromagnetic exciting system carries out mechanical exciting to blade by electromagnetic vibration generator system, and the sound wave excitation system is to leaf
Piece carries out sound wave exciting, and the sonic test system is used to measure the acoustic pressure of the sound wave of loudspeaker generation, the stress test system
The vibration stress united for measuring blade.
A kind of side carrying out blade fatigue test using the above-mentioned mechanical blade fatigue test system for coupling exciting with sound wave
Method, which is characterized in that include the following steps:
Step 1: open signal generator, the output frequency of adjustment signal generator, when the output frequency of signal generator
When reaching the resonant frequency of blade, keep the output frequency of signal generator constant；
Step 2: opening sound wave excitation system and sonic test system, signal generator is simultaneously emitted by the first electric signal and the
Two electric signals, the first electric signal and the second signal frequency are identical, and the first electric signal is after the amplification of the first power amplifier, control
Loudspeaker processed generates acoustic signals；Acoustic signals are converted into third electric signal by microphone, and third electric signal is passed to
Third electric signal after the second power amplifier amplifies third electric signal, is passed to the analysis of the first signal by two power amplifiers
System, the first Signal Analysis System analyze third electric signal, obtain the acoustic pressure of acoustic signals；Adjust the first power amplification
Device closes the first power amplifier after acoustic pressure reaches a dB；
Step 3: opening electromagnetic vibration generator system, the second electric signal controls electromagnetic vibration generator system and generates mechanical exciting force；Foil gauge pair
The strain of blade measures and generates strain signal and passes to strain signal after dynamic strain indicator amplifies strain signal
Second signal analysis system, second signal analysis system analyze strain signal, obtain the vibration stress of blade；Adjustment electricity
The output gain of magnetic vibration platform keeps the output gain of electromagnetic vibration generator system constant when the vibration stress of blade reaches b MPa；
Step 4: opening the first power amplifier, the mechanical exciting force and sound wave excitation system that electromagnetic exciting system generates produce
Raw sound wave exciting force is coupled, and forms coupling exciting force, blade generates resonance under the action of coupling exciting force, by answering
Force test system carries out vibration stress measurement to blade；
Step 5: the vibrating fatigue that circulation radix is n being carried out to blade and is examined, research coupling exciting is to blade fatigue performance
Influence.
The invention has the benefit that
First, the present invention is coupled by mechanical with raw wave, is generated a kind of new exciting force, can be considered mechanical load simultaneously
Influence with sound wave load to blade strength meets the fatigue test for having particular/special requirement blade；
Second, the present invention uses same-phase excitation system, namely gives electric and magnetic oscillation simultaneously using the same signal generator
Platform and loudspeaker send the electric signal of identical frequency, ensure that electromagnetic vibration generator system and the consistency of loudspeaker vibration phase with it is synchronous
Property, improve the reliability of test result.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the blade fatigue test system that machinery of the invention couples exciting with sound wave.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
The object of the present invention is to provide a kind of mechanical blade fatigue test system and methods that exciting is coupled with sound wave, can
Mechanical load and influence of the sound wave load to blade strength are considered simultaneously, meets the fatigue test for having particular/special requirement blade, are improved
The reliability of test result.
As shown in Figure 1, the structural schematic diagram of the blade fatigue test system of exciting is coupled with sound wave for machinery of the invention.
Machinery of the invention couples the blade fatigue test system of exciting with sound wave, it is characterised in that: including blade, blade clamping system
System, electromagnetic exciting system, sound wave excitation system, sonic test system, stress test system；
The blade mounting and clamping system includes fixture, and the electromagnetic exciting system includes electromagnetic vibration generator system, the sound wave exciting
System includes signal generator, the first power amplifier and loudspeaker, and the sonic test system includes microphone, the second power
Amplifier and the first Signal Analysis System, the stress test system include foil gauge, dynamic strain indicator and second signal analysis
System；
It is rigidly connected between the blade and electromagnetic vibration generator system by fixture, the electromagnetic vibration generator system and signal generator electricity
Connection, the signal generator is successively electrically connected with the first power amplifier, loudspeaker, the microphone successively with the second power
Amplifier, the electrical connection of the first Signal Analysis System, the foil gauge connect with blade, the foil gauge successively with dynamic strain
Instrument, the electrical connection of second signal analysis system.
The foil gauge is resistance strain gage.
The foil gauge and blade are attached by glue.
The electromagnetic exciting system carries out mechanical exciting to blade by electromagnetic vibration generator system, and the sound wave excitation system is to leaf
Piece carries out sound wave exciting, and the sonic test system is used to measure the acoustic pressure of the sound wave of loudspeaker generation, the stress test system
The vibration stress united for measuring blade.
Of the invention carries out blade fatigue test using the above-mentioned mechanical blade fatigue test system for coupling exciting with sound wave
Method, which is characterized in that include the following steps:
Step 1: open signal generator, the output frequency of adjustment signal generator, when the output frequency of signal generator
When reaching the resonant frequency of blade, keep the output frequency of signal generator constant；
Step 2: opening sound wave excitation system and sonic test system, signal generator is simultaneously emitted by the first electric signal and the
Two electric signals, the first electric signal and the second signal frequency are identical, and the first electric signal is after the amplification of the first power amplifier, control
Loudspeaker processed generates acoustic signals；Acoustic signals are converted into third electric signal by microphone, and third electric signal is passed to
Third electric signal after the second power amplifier amplifies third electric signal, is passed to the analysis of the first signal by two power amplifiers
System, the first Signal Analysis System analyze third electric signal, obtain the acoustic pressure of acoustic signals；Adjust the first power amplification
Device closes the first power amplifier after acoustic pressure reaches a dB；
Step 3: opening electromagnetic vibration generator system, the second electric signal controls electromagnetic vibration generator system and generates mechanical exciting force；Foil gauge pair
The strain of blade measures and generates strain signal and passes to strain signal after dynamic strain indicator amplifies strain signal
Second signal analysis system, second signal analysis system analyze strain signal, obtain the vibration stress of blade；Adjustment electricity
The output gain of magnetic vibration platform keeps the output gain of electromagnetic vibration generator system constant when the vibration stress of blade reaches b MPa；
Step 4: opening the first power amplifier, the mechanical exciting force and sound wave excitation system that electromagnetic exciting system generates produce
Raw sound wave exciting force is coupled, and forms coupling exciting force, blade generates resonance under the action of coupling exciting force, by answering
Force test system carries out vibration stress measurement to blade；
Step 5: the vibrating fatigue that circulation radix is n being carried out to blade and is examined, research coupling exciting is to blade fatigue performance
Influence.
In the present embodiment, a=120, b=400 recycle radix n=3 × 107.Wherein, blade vibration is once one and follows
Ring.
Above-mentioned machinery of the invention couples the blade fatigue test system and method for exciting with sound wave, using same-phase exciting
System, namely give electromagnetic vibration generator system and loudspeaker to send the electric signal of identical frequency simultaneously using the same signal generator, it protects
The consistency and synchronism of electromagnetic vibration generator system and loudspeaker vibration phase are demonstrate,proved, it is ensured that test result is accurate, reliable.The present invention is same
When consider mechanical load and influence of the sound wave load to blade strength, the fatigue test for meeting blade under special state is wanted
It asks.Further, it is also possible to the load such as aerodynamic loading be added, to carry out the blade fatigue test under other different exciting force couplings.
Obviously, above-described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Above-mentioned implementation
Example for explaining only the invention, is not intended to limit the scope of the present invention..Based on the above embodiment, those skilled in the art
Member's every other embodiment obtained namely all in spirit herein and original without making creative work
Made all modifications, equivalent replacement and improvement etc., are all fallen within the protection domain of application claims within reason.
Claims (5)
1. the blade fatigue test system that a kind of machinery couples exciting with sound wave, it is characterised in that: including blade, blade clamping system
System, electromagnetic exciting system, sound wave excitation system, sonic test system, stress test system；
The blade mounting and clamping system includes fixture, and the electromagnetic exciting system includes electromagnetic vibration generator system, the sound wave excitation system
Including signal generator, the first power amplifier and loudspeaker, the sonic test system includes microphone, the second power amplification
Device and the first Signal Analysis System, the stress test system include foil gauge, dynamic strain indicator and second signal analysis system；
It is rigidly connected between the blade and electromagnetic vibration generator system by fixture, the electromagnetic vibration generator system is electrically connected with signal generator
It connects, the signal generator is successively electrically connected with the first power amplifier, loudspeaker, and the microphone is successively put with the second power
Big device, the electrical connection of the first Signal Analysis System, the foil gauge are connect with blade, the foil gauge successively with dynamic strain indicator,
The electrical connection of second signal analysis system.
2. the blade fatigue test system that machinery according to claim 1 couples exciting with sound wave, which is characterized in that described
Foil gauge is resistance strain gage.
3. the blade fatigue test system that machinery according to claim 1 couples exciting with sound wave, which is characterized in that described
Foil gauge and blade are attached by glue.
4. the blade fatigue test system that machinery according to claim 1 couples exciting with sound wave, which is characterized in that described
Electromagnetic exciting system carries out mechanical exciting to blade by electromagnetic vibration generator system, and the sound wave excitation system carries out sound wave to blade and swashs
Vibration, the sonic test system are used to measure the acoustic pressure of the sound wave of loudspeaker generation, and the stress test system is for measuring leaf
The vibration stress of piece.
5. a kind of use the mechanical blade fatigue test system for coupling exciting with sound wave according to any one of claims 1 to 4
The method that system carries out blade fatigue test, which is characterized in that include the following steps:
Step 1: open signal generator, the output frequency of adjustment signal generator, when the output frequency of signal generator reaches
When the resonant frequency of blade, keep the output frequency of signal generator constant；
Step 2: opening sound wave excitation system and sonic test system, signal generator is simultaneously emitted by the first electric signal and the second electricity
Signal, the first electric signal and the second signal frequency are identical, and the first electric signal after the amplification of the first power amplifier, raise by control
Sound device generates acoustic signals；Acoustic signals are converted into third electric signal by microphone, and third electric signal is passed to the second function
Third electric signal is passed to the first Signal Analysis System after the second power amplifier amplifies third electric signal by rate amplifier,
First Signal Analysis System analyzes third electric signal, obtains the acoustic pressure of acoustic signals；The first power amplifier is adjusted, when
After acoustic pressure reaches adB, the first power amplifier is closed；
Step 3: opening electromagnetic vibration generator system, the second electric signal controls electromagnetic vibration generator system and generates mechanical exciting force；Foil gauge is to blade
Strain measure and generate strain signal, after dynamic strain indicator amplifies strain signal, strain signal is passed to second
Signal Analysis System, second signal analysis system analyze strain signal, obtain the vibration stress of blade；Adjust electromagnetic vibration
The output gain of dynamic platform keeps the output gain of electromagnetic vibration generator system constant when the vibration stress of blade reaches bMPa；
Step 4: the first power amplifier is opened, what the mechanical exciting force and sound wave excitation system that electromagnetic exciting system generates generated
Sound wave exciting force is coupled, and coupling exciting force is formed, and blade generates resonance under the action of coupling exciting force, surveyed by stress
Test system carries out vibration stress measurement to blade；
Step 5: the vibrating fatigue that circulation radix is n is carried out to blade and is examined, shadow of the research coupling exciting to blade fatigue performance
It rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811408428.4A CN109540435A (en) | 2018-11-23 | 2018-11-23 | A kind of machinery couples the blade fatigue test system and method for exciting with sound wave |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811408428.4A CN109540435A (en) | 2018-11-23 | 2018-11-23 | A kind of machinery couples the blade fatigue test system and method for exciting with sound wave |
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| CN109540435A true CN109540435A (en) | 2019-03-29 |
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| CN201811408428.4A Pending CN109540435A (en) | 2018-11-23 | 2018-11-23 | A kind of machinery couples the blade fatigue test system and method for exciting with sound wave |
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Cited By (4)
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| CN111120181A (en) * | 2019-12-17 | 2020-05-08 | 河海大学 | Test system and method for measuring dynamic stress of surface of impulse turbine |
| CN111323115A (en) * | 2020-03-11 | 2020-06-23 | 宁波奥克斯电气股份有限公司 | Method and system for testing abnormal sound of indoor unit of air conditioner |
| CN114354112A (en) * | 2022-03-18 | 2022-04-15 | 中国航发四川燃气涡轮研究院 | Blade multi-order coupling vibration fatigue analysis method |
| CN114486134A (en) * | 2021-12-17 | 2022-05-13 | 中国航发湖南动力机械研究所 | Vibration fatigue test radiation noise monitoring device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114486134B (en) * | 2021-12-17 | 2024-07-23 | 中国航发湖南动力机械研究所 | Vibration fatigue test radiation noise monitoring device |
| CN114354112A (en) * | 2022-03-18 | 2022-04-15 | 中国航发四川燃气涡轮研究院 | Blade multi-order coupling vibration fatigue analysis method |
| CN114354112B (en) * | 2022-03-18 | 2022-07-12 | 中国航发四川燃气涡轮研究院 | Blade multi-order coupling vibration fatigue analysis method |
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Application publication date: 20190329 |
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