Vibration response-based crowned blade friction contact nonlinear dynamics test system

Abstract

The invention provides a vibration response-based crowned blade friction contact nonlinear dynamics test system, which comprehensively considers key factors of crowned blade high-rotation-speed dynamic rigidification and blade crown contact friction, can more accurately research the dynamic characteristics of the crowned blade, and provides a reliable basis for design and optimization. Through dynamic modeling and global modal analysis of the blade-impeller coupling system, the interaction of the blade-impeller coupling system and the blade-impeller coupling system can be deeply understood, and a reference is provided for the overall design of rotating machinery. Dimensionality reduction derivation is carried out on a nonlinear kinetic equation, correlation between key parameters and inherent characteristics of the shrouded blade is analyzed, key factors influencing the kinetic characteristics are found out, and design and manufacturing are guided. The system can also simulate the wake excitation phenomenon, analyze the response of the shrouded blade when the parameters change, and guarantee the safe operation of the shrouded blade under the complex working condition. Besides, the system realizes automation and intelligentization of testing, vibration response signals can be rapidly and accurately acquired and analyzed, and research efficiency and precision are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic testing of rotating mechanical components. Specifically, it relates to a non-linear dynamic testing system for friction contact of crowned blades based on vibration response. Background Art

[0002] As a core component of rotating machinery such as aeroengines, gas turbines, and steam turbines that convert thermal energy into mechanical energy, the crowned blade is in a complex operating environment for a long time. During actual operation, the crowned blade bears various complex loads such as high temperature, high pressure, and high rotational speed, which makes it very prone to failure. Once a failure occurs, it often causes significant economic losses and even endangers personal safety.

[0003] The dynamic characteristics of the crowned blade are the key factors to ensure its mechanical reliability. However, in the past, due to the influence of the high-speed rotation of the crowned blade and the contact friction between the blade crowns, the crowned blade has very complex strong non-linear characteristics. This strong non-linearity makes it extremely difficult to study the dynamic evolution law of the crowned blade, posing a huge challenge to the safe application and low-cost operation and maintenance of the crowned blade.

[0004] At present, there are still many deficiencies in the research on the dynamic characteristics of the crowned blade. Existing research methods often have difficulty comprehensively considering the dynamic stiffening effect caused by the high-speed movement of the crowned blade and the important factors of blade crown contact-friction, and the dynamic modeling and analysis of the blade-impeller coupling system are not deep enough to accurately analyze the relevance of key design and assembly parameters to the inherent characteristics of the crowned blade. At the same time, the research on the wake excitation phenomenon commonly encountered by the crowned blade in rotating machinery is not perfect enough to well analyze the wake excitation response of the crowned blade when the structural and operating characteristic parameters change. Therefore, we propose a non-linear dynamic testing system for friction contact of crowned blades based on vibration response. Summary of the Invention

[0005] The purpose of the present invention is to address the problems raised in the existing background art. To achieve the above invention purpose, the present invention provides the following technical solutions: a non-linear dynamic testing system for friction contact of crowned blades based on vibration response, including a crowned blade test device, a data acquisition module, a data analysis and processing module, and a control module;

[0006] The crowned blade test device is used to simulate the actual operating conditions of the crowned blade, including a motor, a transmission mechanism, an impeller, a crowned blade, a wake excitation simulation device, and a vibration sensor; the motor, as a power source, drives the impeller and the crowned blade to rotate through the transmission mechanism, the wake excitation simulation device is used to simulate the wake excitation phenomenon, and the vibration sensor is installed at key parts of the crowned blade and the impeller to monitor the vibration response signal;

[0007] The data acquisition module is used to acquire the signals output by the vibration sensors and convert them into digital signals for transmission to the data analysis and processing module;

[0008] The data analysis and processing module is used to analyze and process the acquired signals to obtain the dynamic characteristic information of the shrouded blades;

[0009] The control module is used to control and adjust the operating parameters of the shrouded blade test device.

[0010] As a preferred technical solution of the present invention, the transmission mechanism is a high-precision gear transmission or belt transmission.

[0011] As a preferred technical solution of the present invention, the shrouded blades adopt a material and structural design similar to those of the shrouded blades of the fourth-generation nuclear power steam turbines.

[0012] As a preferred technical solution of the present invention, the wake excitation simulation device changes the shape, intensity, and frequency parameters of the wake to simulate the wake excitation conditions.

[0013] As a preferred technical solution of the present invention, the data acquisition module includes a signal conditioning circuit, an analog-to-digital converter, and a data acquisition card; the signal conditioning circuit amplifies and filters the weak signals output by the vibration sensors, the analog-to-digital converter converts the analog signals into digital signals, and the data acquisition card acquires and stores the digital signals and transmits them to the data analysis and processing module.

[0014] As a preferred technical solution of the present invention, the data analysis and processing module includes a bending-torsion coupling dynamics characterization module, a blade-impeller coupling system dynamics modeling and global modal analysis module, a key parameter correlation analysis module, and a wake excitation response analysis module;

[0015] The bending-torsion coupling dynamics characterization module comprehensively considers the dynamic stiffening effect and the blade crown contact-friction factors to characterize and analyze the bending-torsion coupling dynamic characteristics of the shrouded blades;

[0016] The blade-impeller coupling system dynamics modeling and global modal analysis module considers the assembly relationship between the blades and the impeller to perform dynamics modeling and global modal analysis on the blade-impeller coupling system;

[0017] The key parameter correlation analysis module analyzes the correlation of the key design and assembly parameters with the inherent characteristics of the shrouded blades by combining the operating conditions of the shrouded blades and the modal contribution degree; the wake excitation response analysis module analyzes the wake excitation response of the shrouded blades when the structural and operating characteristic parameters change.

[0018] As a preferred technical solution of the present invention, the control module includes a controller and a human-computer interaction interface; the controller adopts a programmable logic controller PLC or an industrial computer to accurately control the motor speed and the parameters of the wake excitation simulation device; the human-computer interaction interface provides a user operation interface for setting test parameters, starting and stopping tests, and viewing test data.

[0019] As a preferred technical solution of the present invention, the vibration sensor is used to capture the tiny vibration changes of the shrouded blade under different working conditions.

[0020] As a preferred technical solution of the present invention, the workflow of the test system includes:

[0021] Test preparation: Select the shrouded blades and impellers to install on the test device, and set the control module test parameters;

[0022] Data acquisition: start the motor and wake excitation simulation device, the vibration sensor monitors the signal, and the data acquisition module collects and transmits the data;

[0023] Data analysis and processing: The data analysis and processing module performs analysis and processing on the collected signals in each module;

[0024] Result output and display: Output the analysis results to the human-computer interaction interface for display and save them as files.

[0025] The application of the nonlinear dynamic test system of friction contact of shrouded blades based on vibration response is used to provide a test system for the optimal design and fault vibration analysis of rotating flexible shrouded blades.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Comprehensive consideration of key factors: The test system of the present invention comprehensively considers the dynamic stiffening effect caused by the high-speed movement of the shrouded blades and the important factor of the blade shroud contact-friction, which can more accurately study the dynamic characteristics of the shrouded blades and provide a more reliable basis for the design and optimization of the shrouded blades.

[0028] 2. In-depth analysis of the coupling system: Dynamic modeling and global modal analysis of the blade-impeller coupling system can fully understand the interaction between the shrouded blades and the impeller, providing a reference for the overall design and optimization of rotating machinery.

[0029] 3. Accurately analyze the correlation of key parameters: By reducing the dimension of the nonlinear dynamic equations and analyzing the correlation of key design and assembly parameters to the inherent characteristics of the shrouded blades, the key factors affecting the dynamic characteristics of the shrouded blades can be found, providing guidance for the design and manufacture of shrouded blades.

[0030] 4. Effectively study the wake excitation response: It can simulate the wake excitation phenomenon commonly encountered by shrouded blades in rotating machinery, analyze the wake excitation response of shrouded blades when the structural and operating characteristic parameters change, and provide guarantee for the safe operation of shrouded blades under complex working conditions.

[0031] 5. Improve the research efficiency and accuracy: The test system of the present invention realizes the automation and intelligence of the dynamic characteristic test of shrouded blades, can quickly and accurately collect and analyze the vibration response signals of shrouded blades, and improves the research efficiency and accuracy. Brief Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the system composition provided by the present invention;

[0033] Figure 2 It is a schematic diagram of the shrouded blade test device provided by the present invention;

[0034] Figure 3 It is a schematic diagram of the system module provided by the present invention. Detailed Embodiments

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0036] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents some embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features and technical solutions in the embodiments can be combined with each other. It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] Embodiment 1: A friction contact nonlinear dynamics test system for shrouded blades based on vibration response, including a shrouded blade test device, a data acquisition module, a data analysis and processing module, and a control module;

[0038] The shrouded blade test device is used to simulate the actual operating conditions of shrouded blades, and includes a motor, a transmission mechanism, an impeller, a shrouded blade, a wake excitation simulation device, and a vibration sensor; The motor serves as a power source to drive the impeller and the shrouded blade to rotate through the transmission mechanism. The wake excitation simulation device is used to simulate the wake excitation phenomenon, and the vibration sensor is installed at key parts of the shrouded blade and the impeller to monitor the vibration response signals.

[0039] The data acquisition module is used to collect the signals output by the vibration sensors and convert them into digital signals for transmission to the data analysis and processing module;

[0040] The data analysis and processing module is used to analyze and process the collected signals to obtain the dynamic characteristic information of the shrouded blades;

[0041] The control module is used to control and adjust the operating parameters of the shrouded blade test device.

[0042] The transmission mechanism is a high-precision gear transmission or belt transmission.

[0043] The shrouded blades adopt materials and structural designs similar to those of the shrouded blades of the fourth-generation nuclear power steam turbines.

[0044] The wake excitation simulation device changes the shape, intensity, and frequency parameters of the wake to simulate the wake excitation conditions.

[0045] The data acquisition module includes a signal conditioning circuit, an analog-to-digital converter, and a data acquisition card; the signal conditioning circuit amplifies and filters the weak signals output by the vibration sensors, the analog-to-digital converter converts the analog signals into digital signals, and the data acquisition card collects and stores the digital signals and transmits them to the data analysis and processing module.

[0046] The data analysis and processing module includes a bending-torsion coupling dynamics characterization module, a blade-impeller coupling system dynamics modeling and global modal analysis module, a key parameter correlation analysis module, and a wake excitation response analysis module;

[0047] The bending-torsion coupling dynamics characterization module comprehensively considers the dynamic stiffening effect and the blade crown contact-friction factors, and characterizes and analyzes the bending-torsion coupling dynamics characteristics of the shrouded blades;

[0048] The blade-impeller coupling system dynamics modeling and global modal analysis module considers the assembly relationship between the blades and the impeller, and conducts dynamics modeling and global modal analysis on the blade-impeller coupling system;

[0049] The key parameter correlation analysis module combines the operating conditions of the shrouded blades and the modal contribution degree to analyze the correlation of the key design and assembly parameters to the inherent characteristics of the shrouded blades; the wake excitation response analysis module analyzes the wake excitation response of the shrouded blades when the structural and operating characteristic parameters change.

[0050] The control module includes a controller and a human-machine interface; the controller uses a programmable logic controller (PLC) or an industrial computer to precisely control the motor speed and the parameters of the wake excitation simulation device; the human-machine interface provides a user operation interface for setting test parameters, starting and stopping the test, and viewing test data.

[0051] The vibration sensor is used to capture the tiny vibration changes of the shrouded blade under different working conditions.

[0052] The working process of the test system includes:

[0053] Test preparation: Select the shrouded blade and impeller and install them on the test device, and set the test parameters of the control module;

[0054] Data acquisition: Start the motor and wake excitation simulation device, the vibration sensor monitors the signal, and the data acquisition module acquires and transmits the data;

[0055] Data analysis and processing: The data analysis and processing module analyzes and processes the acquired signals for each module;

[0056] Result output and display: Output the analysis results to the human-machine interaction interface for display and save them as files.

[0057] The application of the friction contact nonlinear dynamics test system for shrouded blades based on vibration response is characterized in that the test system is used to provide a test system for the optimal design and fault vibration analysis of rotating flexible shrouded blades.

[0058] The friction contact nonlinear dynamics test system for shrouded blades based on vibration response based on Python.

[0059] Code

[0060]

[0061]

[0062]

[0063] Code explanation

[0064] 1. Parameter definition: Define the mass m, stiffness k, damping coefficient c, friction coefficient mu, excitation force amplitude F0, and excitation force frequency omega of the shrouded blade system.

[0065] 2. Nonlinear dynamics equation: The nonlinear_dynamics function describes the nonlinear dynamics equation of the shrouded blade, considering the influence of the frictional force. The calculation of the frictional force is judged according to the speed and force condition of the blade.

[0066] 3. Numerical solution: Use the odeint function to numerically solve the dynamics equation to obtain the changes of the displacement and velocity of the blade with time.

[0067] 4. Result visualization: Use the matplotlib library to plot the curves of the displacement and velocity of the blade with time

[0068] Overall architecture of the test system

[0069] The friction contact nonlinear dynamics test system of shrouded blades based on vibration response of the present invention mainly includes a shrouded blade test device, a data acquisition module, a data analysis and processing module, and a control module.

[0070] Shrouded blade test device

[0071] The shrouded blade test device is used to simulate the operating conditions of shrouded blades in actual rotating machinery, and is mainly composed of a motor, a transmission mechanism, an impeller, shrouded blades, a wake excitation simulation device, and vibration sensors.

[0072] Motor: As a power source, it drives the impeller and shrouded blades to rotate at high speed through the transmission mechanism. The rotational speed of the motor can be precisely adjusted through the control module to simulate different operating speeds.

[0073] Transmission mechanism: Adopts high-precision gear transmission or belt transmission to ensure that the power of the motor can be stably and accurately transmitted to the impeller, reducing vibration and error during the transmission process.

[0074] Impeller: The carrier for installing the shrouded blades, and its design and manufacturing precision directly affect the dynamic characteristics of the shrouded blades. The structure and parameters of the impeller can be adjusted and replaced according to actual research needs.

[0075] Shrouded blades: The research object, adopting materials and structural designs similar to those of the shrouded blades of the fourth-generation nuclear power steam turbine to ensure the reliability and effectiveness of the test results.

[0076] Wake excitation simulation device: Used to simulate the wake excitation phenomenon commonly encountered by shrouded blades in rotating machinery. This device can simulate different wake excitation conditions by changing the shape, intensity, and frequency parameters of the wake.

[0077] Vibration sensors: Installed at key parts of the shrouded blades and the impeller, used to monitor the vibration response signals of the shrouded blades and the impeller in real time. The vibration sensors adopt high-precision and high-sensitivity sensors, which can accurately capture the minute vibration changes of the shrouded blades under different working conditions.

[0078] Data acquisition module

[0079] The data acquisition module is used to collect the vibration response signals output by the vibration sensors and convert them into digital signals for transmission to the data analysis and processing module. This module is mainly composed of a signal conditioning circuit, an analog-to-digital converter, and a data acquisition card.

[0080] Signal conditioning circuit: Amplifies and filters the weak signals output by the vibration sensors to improve the quality and stability of the signals.

[0081] Analog-to-Digital Converter: Converts the conditioned analog signal into a digital signal for subsequent data analysis and processing.

[0082] Data Acquisition Card: Responsible for collecting and storing digital signals, and transmitting the data to the data analysis and processing module through an interface.

[0083] Data Analysis and Processing Module

[0084] The data analysis and processing module is the core part of the test system, mainly used for analyzing and processing the collected vibration response signals of the shrouded blades to obtain the dynamic characteristic information of the shrouded blades. This module mainly includes the following functional modules:

[0085] Bending-Torsion Coupling Dynamics Characterization Module: Considering the dynamic stiffening effect caused by the high-speed movement of the shrouded blades and the important factors of blade crown contact-friction, it characterizes and analyzes the bending-torsion coupling dynamics characteristics of the shrouded blades. By establishing a bending-torsion coupling dynamics model and combining the collected vibration response signals, it solves the dynamic parameters of the shrouded blades, such as natural frequencies and vibration modes.

[0086] Blade-Impeller Coupling System Dynamics Modeling and Global Modal Analysis Module: Considering the assembly relationship between the blade and the impeller, it conducts dynamics modeling and global modal analysis on the blade-impeller coupling system. By establishing the dynamics equation of the blade-impeller coupling system and using numerical calculation methods to solve the natural frequencies and vibration modes of the system, it analyzes the dynamic characteristics of the system.

[0087] Key Parameter Correlation Analysis Module: Combining the operating conditions of the shrouded blades and the modal contribution degree, it conducts dimensionality reduction derivation of the nonlinear dynamics equation and analyzes the correlation of key design and assembly parameters (such as the geometric dimensions, material properties, and blade crown contact stiffness of the blades) with the inherent characteristics of the shrouded blades. By changing these parameters, it observes the changes in the dynamic characteristics of the shrouded blades and finds out the key factors affecting the inherent characteristics of the shrouded blades.

[0088] Wake Excitation Response Analysis Module: Analyzes the wake excitation response of the shrouded blades when the structural and operating characteristic parameters change. By changing the parameters of the wake excitation simulation device, it simulates different wake excitation conditions, collects the vibration response signals of the shrouded blades under the action of wake excitation, and analyzes the response characteristics of the shrouded blades, such as the variation laws of amplitude and frequency with the structural and operating characteristic parameters.

[0089] Control Module

[0090] The control module is used to control and adjust the operating parameters of the shrouded blade test device to ensure the safety and stability of the test process. This module mainly consists of a controller and a human-machine interface.

[0091] Controller: A programmable logic controller (PLC) or an industrial computer is adopted to precisely control the rotational speed of the motor and the parameters of the wake excitation simulation device according to the preset control strategy.

[0092] Human-machine interface: It provides a friendly user operation interface through which the operator can set test parameters, start and stop the test, and view test data.

[0093] Workflow of the test system

[0094] The workflow of the vibration response-based nonlinear dynamics test system for shrouded blades in frictional contact is as follows:

[0095] 1. Test preparation: According to the research requirements, select appropriate shrouded blades and impellers and install them on the shrouded blade test device. Set the test parameters of the control module, such as the rotational speed of the motor and the parameters of the wake excitation simulation device.

[0096] 2. Data acquisition: Start the motor to drive the shrouded blades and impellers to rotate at high speed. At the same time, the wake excitation simulation device starts to work to simulate the wake excitation phenomenon. The vibration sensors continuously monitor the vibration response signals of the shrouded blades and impellers and transmit the signals to the data acquisition module. The data acquisition module conditions, converts, and acquires the signals and transmits the acquired data to the data analysis and processing module.

[0097] 3. Data analysis and processing: The data analysis and processing module analyzes and processes the acquired vibration response signals. First, the bending-torsion coupling dynamics characterization module characterizes and analyzes the bending-torsion coupling dynamics characteristics of the shrouded blades; then, the blade-impeller coupling system dynamics modeling and global modal analysis module conducts dynamics modeling and global modal analysis on the blade-impeller coupling system; next, the key parameter correlation analysis module analyzes the correlation between the key design and assembly parameters and the inherent characteristics of the shrouded blades; finally, the wake excitation response analysis module analyzes the response characteristics of the shrouded blades under the action of wake excitation.

[0098] 4. Result output and display: The data analysis and processing module outputs the analysis and processing results to the human-machine interface for display. The operator can view the dynamics characteristic information of the shrouded blades, such as natural frequency, vibration mode, amplitude, and frequency, through the human-machine interface. At the same time, the data analysis and processing module can also save the analysis and processing results as files for subsequent research and reference.

[0099] Working principle of the vibration response-based nonlinear dynamics test system for shrouded blades in frictional contact

[0100] Overview of the overall principle

[0101] This test system is designed to simulate the actual operating conditions of shrouded blades. By collecting their vibration response signals and using a series of data analysis and processing methods, it obtains the dynamic characteristic information of shrouded blades, providing a basis for the optimal design and fault vibration analysis of rotating flexible shrouded blades. The system mainly consists of a shrouded blade test device, a data acquisition module, a data analysis and processing module, and a control module that work together to complete the test tasks.

[0102] Operating principles of each module

[0103] Shrouded blade test device

[0104] This device is the physical simulation core of the entire system and is used to reproduce the actual operating environment of shrouded blades.

[0105] Power drive: The motor serves as the power source, and the power it outputs is transmitted through a high-precision gear drive or belt drive mechanism, driving the impeller and shrouded blades to rotate at high speed. This drive method can ensure the stability and accuracy of power transmission, making the rotation conditions of shrouded blades close to the actual operating situation.

[0106] Wake excitation simulation: The wake excitation simulation device can change the shape, intensity, and frequency parameters of the wake to simulate different wake excitation conditions. In actual operation, shrouded blades are affected by the wake. This device simulates the wake excitation phenomenon, causing the shrouded blades to bear a similar actual excitation force and thus generating corresponding vibrations.

[0107] Vibration monitoring: Vibration sensors are installed at key parts of the shrouded blades and the impeller to capture the minute vibration changes of the shrouded blades under different working conditions. These sensors convert the mechanical vibrations of the shrouded blades into electrical signals, providing a basis for subsequent data acquisition and analysis.

[0108] Data acquisition module

[0109] This module is responsible for converting the analog signals output by the vibration sensors into digital signals and transmitting them to the data analysis and processing module.

[0110] Signal conditioning: The signals output by the vibration sensors are usually weak and may contain noise. The signal conditioning circuit amplifies and filters these weak signals to improve the signal quality and intensity, making them more suitable for subsequent analog-to-digital conversion.

[0111] Analog-to-digital conversion: The analog-to-digital converter converts the conditioned analog signals into digital signals for computer processing and analysis.

[0112] Data acquisition and storage: The data acquisition card acquires and stores these digital signals and then transmits them to the data analysis and processing module for further analysis.

[0113] Data analysis and processing module

[0114] This module deeply analyzes the collected digital signals to obtain information on the dynamic characteristics of the shrouded blades.

[0115] Bending-torsion coupling dynamics characterization module: Considering the dynamic stiffening effect and the blade crown contact-friction factor comprehensively, it characterizes and analyzes the bending-torsion coupling dynamic characteristics of the shrouded blades. The dynamic stiffening effect affects the dynamic characteristics of the shrouded blades, while the blade crown contact-friction phenomenon increases the nonlinearity of the system. This module reveals the dynamic behavior of the shrouded blades under the condition of bending-torsion coupling through the processing of the collected signals.

[0116] Blade-impeller coupling system dynamics modeling and global modal analysis module: Considering the assembly relationship between the blade and the impeller, it conducts dynamics modeling and global modal analysis on the blade-impeller coupling system. The interaction between the blade and the impeller affects the dynamic characteristics of the entire system. This module analyzes the global modes of the system by establishing an accurate dynamics model to understand the vibration characteristics of the system.

[0117] Key parameter correlation analysis module: Combining the operating conditions of the shrouded blades and the modal contribution degree, it analyzes the correlation of key design and assembly parameters with the inherent characteristics of the shrouded blades. Through the analysis of these parameters, it can be understood which parameters have a greater impact on the dynamic characteristics of the shrouded blades, providing a basis for optimization design.

[0118] Wake excitation response analysis module: Analyzes the wake excitation response of the shrouded blades when the structural and operating characteristic parameters change. By changing the structural and operating parameters of the shrouded blades, observing the response changes under wake excitation, it understands the sensitivity of the shrouded blades to wake excitation.

[0119] Control module: This module is used to control and adjust the operating parameters of the shrouded blade test device to ensure the smooth progress of the test. Parameter control: The controller uses a programmable logic controller (PLC) or an industrial computer to precisely control the motor speed and the parameters of the wake excitation simulation device. By precisely controlling these parameters, different operating conditions can be simulated to meet different test requirements.

[0120] Human-machine interaction: The human-machine interaction interface provides an operation interface for users. Users can set test parameters, start and stop the test, and view test data through this interface. This interaction method facilitates users to monitor and manage the test process.

[0121] Working process principle

[0122] 1. Test preparation: Select a crowned blade and an impeller with similar materials and structural designs to those of the crowned blade of a fourth-generation nuclear power steam turbine, and install them on the test device. Then, set the test parameters of the control module through the human-machine interface, such as the motor speed and the parameters of the wake excitation simulation device, to prepare for the test.

[0123] 2. Data acquisition: Start the motor and the wake excitation simulation device to make the crowned blade rotate under simulated actual working conditions. The vibration sensor monitors the vibration signals of the crowned blade and the impeller. The data acquisition module collects, conditions, converts, and stores these signals, and transmits them to the data analysis and processing module.

[0124] 3. Data analysis and processing: The data analysis and processing module analyzes and processes the collected signals for each module, such as bend-twist coupling dynamics characterization, dynamics modeling and global modal analysis of the blade-impeller coupling system, key parameter correlation analysis, and wake excitation response analysis, to obtain the dynamic characteristic information of the crowned blade.

[0125] 4. Result output and display: Output the analysis results to the human-machine interface for display, which is convenient for users to intuitively view the test results. At the same time, save the results as a file for subsequent further analysis and research.

[0126] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation manners. Therefore, any modification or replacement of the present invention; and all technical solutions and their improvements that do not depart from the spirit and scope of the invention are covered by the scope of the claims of the present invention.

Claims

1. A friction contact nonlinear dynamics test system for a crowned blade based on vibration response, characterized in that It includes a crowned blade test device, a data acquisition module, a data analysis and processing module, and a control module; The shrouded blade test device is used to simulate the actual operating conditions of the shrouded blade, and includes a motor, a transmission mechanism, an impeller, a shrouded blade, a wake excitation simulation device and a vibration sensor; the motor is used as a power source to drive the impeller and the shrouded blade to rotate through the transmission mechanism, the wake excitation simulation device is used to simulate the wake excitation phenomenon, and the vibration sensor is installed at the key positions of the shrouded blade and the impeller to monitor the vibration response signal; The data acquisition module is used to collect the signal output by the vibration sensor and convert it into a digital signal to transmit to the data analysis and processing module; The data analysis and processing module is used to analyze and process the collected signals to obtain the dynamic characteristics information of the shrouded blades; The control module is used to control and adjust the operating parameters of the shrouded blade testing device.

2. The friction contact nonlinear dynamics test system for a crowned blade based on vibration response according to claim 1, characterized in that The transmission mechanism is a high-precision gear transmission or belt transmission.

3. The friction contact nonlinear dynamics test system for a crowned blade based on vibration response according to claim 1, characterized in that The shrouded blades are made of materials and have a structural design similar to those of shrouded blades of fourth-generation nuclear power steam turbines.

4. The friction contact nonlinear dynamics test system for a crowned blade based on vibration response according to claim 1, characterized in that The wake excitation simulation device changes the shape, intensity and frequency parameters of the wake to simulate the wake excitation working condition.

5. The friction contact nonlinear dynamics test system for a crowned blade based on vibration response according to claim 1, characterized in that The data acquisition module includes a signal conditioning circuit, an analog-to-digital converter and a data acquisition card; the signal conditioning circuit amplifies and filters the weak signal output by the vibration sensor, the analog-to-digital converter converts the analog signal into a digital signal, and the data acquisition card collects and stores the digital signal and transmits it to the data analysis and processing module.

6. The friction contact nonlinear dynamics test system for a crowned blade based on vibration response according to claim 1, wherein, The data analysis and processing module includes a bending-torsion coupling dynamics characterization module, a blade-impeller coupling system dynamics modeling and global modal analysis module, a key parameter correlation analysis module and a wake excitation response analysis module; The bending-torsion coupling dynamics characterization module comprehensively considers the dynamic stiffening effect and the blade shroud contact-friction factors to characterize and analyze the bending-torsion coupling dynamic characteristics of the shrouded blade; The blade-impeller coupling system dynamics modeling and global modal analysis module considers the assembly relationship between blades and impellers, and performs dynamics modeling and global modal analysis on the blade-impeller coupling system; The key parameter correlation analysis module combines the operating conditions and modal contributions of shrouded blades to analyze the correlation of key design and assembly parameters to the inherent characteristics of shrouded blades; The wake excitation response analysis module analyzes the wake excitation response of shrouded blades when the structural and operating characteristic parameters change.

7. The friction contact nonlinear dynamics test system for a crowned blade based on vibration response according to claim 1, wherein The control module includes a controller and a human-computer interaction interface; the controller uses a programmable logic controller PLC or an industrial computer to accurately control the motor speed and the parameters of the wake excitation simulation device; the human-computer interaction interface provides a user operation interface for setting test parameters, starting and stopping tests, and viewing test data.

8. The friction contact nonlinear dynamics test system for a crowned blade based on vibration response according to claim 1, wherein The vibration sensor is used to capture small vibration changes of the shrouded blade under different working conditions.

9. The friction contact nonlinear dynamics test system for a crowned blade based on vibration response according to claim 1, wherein, The workflow of the test system includes: Test preparation: Select the shrouded blades and impellers to install on the test device, and set the control module test parameters; Data acquisition: start the motor and wake excitation simulation device, the vibration sensor monitors the signal, and the data acquisition module collects and transmits the data; Data analysis and processing: The data analysis and processing module performs analysis and processing on the collected signals in each module; Result output and display: Output the analysis results to the human-computer interaction interface for display and save them as files.

10. Application of the friction contact nonlinear dynamics test system for crowned blades based on vibration response according to any one of claims 1 to 9, characterized in that, This test system is used to provide a test system for the optimal design of rotating flexible banded blades and fault vibration analysis.

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