Dynamic balancing method of propfan engine rotor forces and couples based on MIPV to characterize unbalanced response

Abstract

The present invention discloses a propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response. A MEMS three-axis vibration acceleration sensor is used to extract the fundamental frequency vibration signals of the propfan engine rotor at radial horizontal and vertical measuring points and two axial fixed bearing support measuring points in real time, and synthesize the two-dimensional axis trajectory. The two-dimensional axis trajectory of the two fixed bearing support measuring points is synthesized into a three-dimensional axis trajectory. The fundamental frequency elliptical axis trajectory is converted into a fundamental frequency circular axis trajectory. By comparing the areas swept by the IPV in the fundamental frequency elliptical axis trajectory and the MIPV in the fundamental frequency circular axis trajectory before and after adding the test weight, the amplitude and phase of the MIPV are obtained. The unbalanced response of the propfan engine rotor is characterized by MIPV, and the force and couple components in the unbalanced response, the propfan engine rotor force and couple balancing mass, and the counterweight mass added to the two counterweight plates of the propfan engine rotor are calculated, and the force and couple dynamic balancing of the propfan engine rotor is performed at the same time.

Description

Technical Field

[0001] The present invention relates to a propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response, which aims at the problem that unbalanced vibration is difficult to suppress under the anisotropic stiffness of the propfan engine rotor. A MEMS three-axis vibration acceleration sensor is used to extract the fundamental frequency vibration signals of the radial horizontal and vertical measuring points and the two axial fixed bearing support measuring points of the propfan engine rotor in real time, synthesize the three-dimensional axis trajectory, and apply the improved initial phase vector (MIPV) equivalent unbalanced response to perform the force and couple dynamic balancing of the propfan engine. This method is used to achieve the force and couple dynamic balancing under anisotropic support. The dynamic balancing efficiency of the propfan engine rotor is improved; it belongs to the field of propfan engine rotor fault diagnosis. Background Art

[0002] Propfan engines have the typical advantages of low fuel consumption and high propulsion efficiency. For example, the An-70 transport aircraft (D-27 propfan engine) consumes more than 20% less fuel than jet transport aircraft of the same level, and the overall propulsion efficiency is increased by 8%-10%. It is the development direction of engines for future strategic transport aircraft and long-range bombers. However, the outstanding problem of propfan engines is the high vibration and noise. The outstanding problem of propfan engine rotors is the high vibration and noise. The complex structure of propfan engines leads to the anisotropy of the rotor-bearing system stiffness, resulting in low dynamic balancing efficiency. Therefore, it is urgent to carry out research on dynamic balancing methods for propfan engines that take into account the anisotropic characteristics of the supports.

[0003] The main dynamic balancing methods for rotating machinery include the influence coefficient method, the modal balancing method, and the improved balancing methods based on these methods, which are applicable to different fields. However, most of these studies are based on the assumption of isotropic stiffness and use single measuring point vibration for dynamic balancing. However, the anisotropic characteristics brought by the rotor-bearing system of the propfan engine lead to significant differences in the vibration of the rotor at the horizontal and vertical measuring points in the radial direction and at different axial measuring points, making it difficult to carry out effective dynamic balancing. In addition, the conventional axis trajectory dynamic balancing method uses two vibration sensors installed perpendicular to each other to fully obtain the two-dimensional axis trajectory of the shaft in the horizontal and vertical directions in the radial direction. However, this acquisition method only considers the vibration in the two perpendicular radial directions, and does not consider the vibration difference at different axial measuring points, and cannot detect couple imbalance and cannot effectively balance couple imbalance.

[0004] Improved initial phase vector (MIPV) can avoid the problem of poor initial phase vector (IPV) stability caused by the anisotropy of propfan engine rotor stiffness. MIPV can linearly normalize the nonlinear elliptical axis trajectory of the propfan engine rotor, thereby linearly expressing the vibration axis trajectory under anisotropic support, and using MIPV equivalent unbalanced response to perform force and couple imbalance of the propfan engine rotor. The present invention uses a MEMS three-axis vibration acceleration sensor to achieve real-time monitoring of three-dimensional vibration under limited measuring points, improve measurement efficiency, and is conducive to promotion and application on real propfan engines.

[0005] In the dynamic balancing method for propfan engine rotors, the patent with the publication number [CN117147057A] proposes a 'Method for reconstructing the axis trajectory of a counter-rotating propfan based on a Mems three-axis vibration acceleration sensor'. This method identifies the amplitude and phase of the horizontal and vertical directions of the inner and outer rotors of the counter-rotating propfan engine at two measuring points by means of beat-to-beat analysis, determines the existence of forces and couples by the initial phase difference, performs dynamic balancing by the equivalent unbalanced response of the main vibration vector, and determines whether the operation state of the counter-rotating propfan engine is stable. This method uses the improved initial phase vector (MIPV) equivalent to the unbalanced response of the propfan engine, thereby linearly representing the unbalanced response of the propfan engine rotor under anisotropic support. This method is aimed at a mixed form of imbalance in which force and couple imbalance exist simultaneously in the system. This method can decompose the mixed form of imbalance into force imbalance and couple imbalance, thereby suppressing the force and couple imbalance in the propfan engine rotor under anisotropic support characteristics respectively. In addition, the method can simultaneously monitor the unbalanced vibration of the radial horizontal and vertical measuring points of the propfan engine rotor and the two axial fixed bearing support measuring points, and can simultaneously suppress the unbalanced vibration of the radial horizontal and vertical measuring points of the propfan engine rotor and the two axial fixed bearing support measuring points.

[0006] In the dynamic balancing method based on the axis trajectory, the patent with the publication number [CN101907089A] proposes "a compressor shaft fault diagnosis method based on the three-dimensional space axis trajectory". This method uses three eddy current sensors to measure the vibration signals in three directions of a single measuring point, and the instantaneous amplitudes of the three signals correspond one to one to form a three-dimensional axis trajectory. This patent forms a three-dimensional axis trajectory by connecting the two-dimensional axis trajectories of the two fixed bearing support planes with a straight line. The patent with the publication number [CN101387575] proposes a "full information analysis method and device for rotor bearing system faults". The patent with the publication number [CN114897017A] proposes "a method and device for identifying the axis trajectory of a rotating machinery rotor". Summary of the invention

[0007] The technical purpose of the present invention is to propose a propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response. First, a MEMS three-axis vibration acceleration sensor is used to extract the fundamental frequency vibration signals of the propfan engine rotor at the radial horizontal and vertical measuring points and the two axial fixed bearing support measuring points in real time, and the vibration signals of the two fixed bearing support measuring points in the radial horizontal and vertical directions are synthesized into two-dimensional axis trajectories respectively, and then the two-dimensional axis trajectories of the two fixed bearing support measuring points are synthesized into three-dimensional axis trajectories. Secondly, the fundamental frequency elliptical axis trajectory is converted into a fundamental frequency circular axis trajectory, and the amplitude and phase of the MIPV are obtained by comparing the areas swept by the IPV in the fundamental frequency elliptical axis trajectory and the MIPV in the fundamental frequency circular axis trajectory before and after adding the test weight. Finally, the unbalanced response of the propfan engine rotor is characterized by MIPV, the force and couple components in the unbalanced response are calculated, the propfan engine rotor force and couple balance mass is calculated, the counterweight mass added to the two counterweight plates of the propfan engine rotor is calculated, and the force and couple dynamic balancing of the propfan engine rotor is performed at the same time.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is:

[0009] A propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response specifically includes the following steps:

[0010] Step 1. Simulate a certain type of propfan engine structure to build a propfan engine rotor test bench to verify the propfan engine rotor force and couple dynamic balancing method based on MIPV to characterize the unbalanced response. The rotor is driven by a motor, and the rotor is directly connected to the drive motor through a coupling. The motor speed is freely controlled by the independently developed rotor motor control program to simulate the rotor working condition. The rotor speed range is 0 to 3700rpm, covering the required test speed. Two counterweight discs are installed on the rotor, with a counterweight radius of 206mm. Each disc has 24 evenly distributed threaded holes to apply counterweight blocks that simulate force and couple imbalance.

[0011] Step 2: The vibration acquisition system includes a photoelectric sensor, two MEMS three-axis acceleration sensors, a data acquisition system, a host computer and signal processing software. The photoelectric sensor measures the speed and key phase of the rotor. The two MEMS sensors are bonded to two fixed support bearing seats to collect the fundamental frequency vibration signals of the propfan engine rotor in the horizontal and vertical directions. The fundamental frequency vibration signal enters the host computer software through the data acquisition system, and LabVIEW and MatLab software are used to realize the dynamic balance of the propfan engine rotor force and couple based on MIPV characterization of unbalanced response.

[0012] Step 3: In the plane E1 of the fixed bearing support at the left measuring point, the fundamental frequency vibration signals in the radial horizontal and vertical directions measured on the plane of the fixed bearing support are synthesized into the fundamental frequency elliptical axis trajectory using the MEMS sensor. The fundamental frequency vibration signal of the i-th segment is expressed as:

[0013]

[0014] Formula (1) changes to:

[0015]

[0016] Where S xi and C xi is the fundamental frequency vibration signal x i The sine and cosine coefficients, S yi and C yi is the fundamental frequency vibration signal y i The sine and cosine coefficients, S xi , C xi , S yi , C yi They are:

[0017]

[0018] The major axis p and minor axis q of the fundamental frequency ellipse axis trajectory are expressed as:

[0019]

[0020] Where m = S xi 2 +C xi 2 +S yi 2 +C yi 2 , n = 2C xi S yi -2C xi S yi From a dynamic point of view, the area of ​​the fundamental frequency elliptical axis trajectory represents the unbalanced vibration energy in the plane. In order to keep the total area of ​​the fundamental frequency elliptical axis trajectory unchanged, it is converted into the fundamental frequency circular axis trajectory. The radius of the fundamental frequency circular axis trajectory is defined as follows:

[0021]

[0022] Then the amplitude of MIPV is r, and the phase β of MIPV can be calculated by the change of IPV before and after adding the test weight. After adding the test weight, the IPV in the axis trajectory of the fundamental frequency ellipse changes from becomes φ 1 ,φ 2IPV is and The phase change of IPV is Δφ, and the area swept by this phase change is:

[0023]

[0024] In the fundamental frequency circular axis trajectory, the area swept by the MIPV is expressed as:

[0025]

[0026] According to S1=S2, Δγ can be calculated as:

[0027]

[0028] Therefore, the phase γ of MIPV before and after adding the test weight 1 and γ 2 They can be expressed as:

[0029]

[0030] The process of extracting the amplitude and phase of the MIPV of plane E2 with the bearing support fixed by the right measuring point is the same as that of the left measuring point.

[0031] Step 5: Use MIPV to characterize the unbalanced response of the propfan engine rotor and perform dynamic balancing of the propfan engine rotor forces and couples.

[0032] In the two fixed bearing support planes E1 and E2, the original unbalanced responses are calculated as MIPV 1 and MIPV 2 , add weight to the counterweight plates D1 and D2 of the propfan engine rotor test bench at the same time and Unbalanced force caused by weighting f 1 and f 2 , will be combined with the original unbalanced force P 1 and P 2 The result is the residual unbalanced force F 1 and F 2 , F 1 and F 2 It can be decomposed into a pair of symmetrical forces F with equal magnitude and the same direction. s , and a pair of antisymmetric forces F of equal magnitude and opposite direction c1 and F c2 , symmetrical force F s 、Antisymmetric force F c1 and F c2 They correspond to the force imbalance and couple imbalance in the system respectively.

[0033] The unbalanced response of the test weight of planes E1 and E2 is measured to be MIPV 3 and MIPV 4 . On planes E1 and E2, the weight and The resulting vibration changes Δc and Δd are:

[0034]

[0035] Symmetrical component A of vibration variation s and the antisymmetric component A d They are:

[0036]

[0037] |A s |、|A d | respectively represent the amplitude of the symmetrical component and the amplitude of the antisymmetrical component of the vibration variation, and α and β represent the phase. s , A d By adding weight and Symmetrical weighting of the and antisymmetric weighting cause.

[0038] Force balance weight M s And the couple balance weight M d They are:

[0039]

[0040] According to formula (13), the weight plate D 1 , D 2 Balancing mass Q to be added O1 , Q O2 for:

[0041]

[0042] The propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response can effectively suppress the unbalanced vibration of the propfan engine rotor with stiffness anisotropy characteristics at the radial horizontal and vertical measuring points, as well as the two axial measuring points.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. This method can realize real-time monitoring of three-dimensional vibration under limited measuring points, greatly improving the measurement efficiency and facilitating its application in real engines. This method can also monitor force imbalance response and couple imbalance response simultaneously.

[0045] 2. The present invention takes into account the anisotropic characteristics of the propfan engine rotor system and linearly normalizes the nonlinear elliptical axis trajectory of the propfan engine rotor through MIPV, thereby linearly expressing the vibration axis trajectory under the anisotropic support and taking into account the vibration differences at different axial measuring points.

[0046] 3. Aiming at the mixed unbalanced faults in which force and couple imbalance exist simultaneously in the propfan engine rotor system, a propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response is proposed. This method has been proven effective through a propfan engine rotor simulation test bench and can simultaneously balance the unbalanced forces and couples in the system to achieve a more precise effect.

[0047] 4. By experimentally comparing the dynamic balancing effects of the traditional harmonic component method and the double-sided influence coefficient method, it can be seen that this method significantly improves the dynamic balancing vibration reduction effect by using the unbalanced response of the MIPV equivalent propfan engine rotor.

[0048] 5. For large rotating machinery, the economic cost of starting and stopping the unit is high, and it is urgent to achieve the best effect with as few starts as possible when implementing dynamic balancing. Compared with dynamic balancing methods such as the dual-plane influence coefficient method that require adding more than two test weights, this method only requires adding one test weight to significantly reduce the vibration amplitude of the two fixed bearing support planes, thereby improving the dynamic balancing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a flow chart of the propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response.

[0050] Figure 2 It is a propfan engine rotor test bench.

[0051] Figure 3 It is the data collection and dynamic balancing process on the laboratory bench.

[0052] Figure 4 is the fundamental frequency ellipse axis trajectory and IPV.

[0053] Figure 5 It is the area swept by IPV in the fundamental frequency elliptical axis trajectory and MIPV in the fundamental frequency circular axis trajectory at the same time.

[0054] Figure 6 It is the force analysis of propfan engine rotor.

[0055] Figure 7 This is a comparison of the effects of this method, the harmonic component method and the dual-plane influence coefficient method. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through implementation examples and in conjunction with the accompanying drawings.

[0057] A propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response, the implementation flow chart is as follows: Figure 1 shown.

[0058] The specific steps include:

[0059] Step 1: Simulate a certain type of propfan engine structure to build a propfan engine rotor test bench, such as Figure 2 As shown. Verify the propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response. The rotor is driven by an electric motor, and the rotor is directly connected to the drive motor through a coupling. Through the independently developed rotor motor control program, the speed of the motor can be freely controlled to simulate the rotor working condition. The rotor speed range is 0 to 3700rpm, covering the required test speed. Two counterweight disks are installed on the rotor, with a counterweight radius of 206mm. Each disk has 24 evenly distributed threaded holes to apply counterweight blocks that simulate force and couple unbalance.

[0060] Step 2: The vibration acquisition system includes a photoelectric sensor, two MEMS three-axis acceleration sensors, a data acquisition system, a host computer and signal processing software. The photoelectric sensor measures the rotation speed and key phase of the rotor. The two MEMS sensors are respectively bonded to two fixed support bearing seats to collect the fundamental frequency vibration signals of the propfan engine rotor in the horizontal and vertical directions. The fundamental frequency vibration signal enters the host computer software through the data acquisition system, and LabVIEW and MatLab software are used to implement the dynamic balance of the propfan engine rotor force and couple based on MIPV characterization of the unbalanced response. The data acquisition system is as follows: Figure 3 shown.

[0061] Step 3: Taking the plane E1 of the fixed bearing support at the left measuring point as an example, the radial horizontal and vertical fundamental frequency vibration signals measured by the MEMS sensor on the plane of the fixed bearing support are synthesized into the fundamental frequency elliptical axis trajectory, as shown in Figure 4 As shown. The fundamental frequency vibration signal of the i-th segment can be expressed as:

[0062]

[0063] Formula (1) can be changed to:

[0064]

[0065] Where S xi and C xi is the fundamental frequency vibration signal x i The sine and cosine coefficients, S yi and Cyi is the fundamental frequency vibration signal y i The sine and cosine coefficients, S xi , C xi , S yi , C yi They are:

[0066]

[0067] The major axis p and minor axis q of the fundamental frequency ellipse axis trajectory are expressed as:

[0068]

[0069] Where m = S xi 2 +C xi 2 +S yi 2 +C yi 2 , n = 2C xi S yi -2S xi C yi From a dynamic point of view, the area of ​​the fundamental frequency elliptical axis trajectory represents the unbalanced vibration energy in the plane. In order to keep the total area of ​​the fundamental frequency elliptical axis trajectory unchanged, it is converted into the fundamental frequency circular axis trajectory. The radius of the fundamental frequency circular axis trajectory is defined as follows:

[0070]

[0071] Then the amplitude of MIPV is r, and the phase β of MIPV can be calculated by the change in IPV before and after adding the test weight. Figure 5 As shown in the figure, after adding the trial weight, the IPV in the fundamental frequency ellipse axis trajectory changes from becomes φ 1 ,φ 2 IPV is and The phase change of IPV is Δφ, and the area swept by this phase change is:

[0072]

[0073] In the fundamental frequency circular axis trajectory, the area swept by the MIPV is expressed as:

[0074]

[0075] According to S1=S2, Δγ can be calculated as:

[0076]

[0077] Therefore, the phase γ of MIPV before and after adding the test weight 1 and γ 2 They can be expressed as:

[0078]

[0079] The process of extracting the amplitude and phase of the MIPV of plane E2 with the bearing support fixed at the right measuring point is similar and will not be repeated here.

[0080] Step 5: Use MIPV to characterize the unbalanced response of the propfan engine rotor and perform dynamic balancing of the propfan engine rotor forces and couples.

[0081] In the two fixed bearing support planes E1 and E2, the original unbalanced responses are calculated as MIPV 1 and MIPV 2 , add weight to the counterweight plates D1 and D2 of the propfan engine rotor test bench at the same time and Unbalanced force caused by weighting f 1 and f 2 , will be combined with the original unbalanced force P 1 and P 2 The result is the residual unbalanced force F 1 and F 2 , F 1 and F 2 It can be decomposed into a pair of symmetrical forces F with equal magnitude and the same direction. s , and a pair of antisymmetric forces F of equal magnitude and opposite direction c1 and F c2 , symmetrical force F s 、Antisymmetric force F c1 and F c2 They correspond to the unbalanced force and couple in the system respectively. The force analysis is as follows: Figure 6 shown.

[0082] The unbalanced response of the test weight of planes E1 and E2 is measured to be MIPV 3 and MIPV 4 . On planes E1 and E2, the weight and The resulting vibration changes Δc and Δd are:

[0083]

[0084] Symmetrical component A of vibration variation s and the antisymmetric component A d They are:

[0085]

[0086] |A s |、|A d | respectively represent the amplitude of the symmetrical component and the amplitude of the antisymmetrical component of the vibration variation, and α and β represent the phase. s , A d By adding weight and Symmetrical weighting of the and antisymmetric weighting cause.

[0087] Force balance weight M s And the couple balance weight M d They are:

[0088]

[0089] According to formula (13), the weight plate D 1 , D 2 Balancing mass Q to be added O1 , Q O2 for:

[0090]

[0091] The propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response can effectively suppress the unbalanced vibration of the propfan engine rotor with stiffness anisotropy characteristics at the radial horizontal and vertical measuring points, as well as the two axial measuring points.

[0092] Example

[0093] Taking the mixed-form unbalance fault of the propfan engine rotor test bench as an example, the algorithm is explained in detail to detect the unbalance response using MIPV equivalent unbalance response, the unbalance response of radial horizontal and vertical measuring points and the two axial fixed bearing support measuring points, the force and couple unbalance response calculation of the propfan engine rotor, and the process and method of calculating the balancing mass added to the two counterweight plates.

[0094] The proposed method for dynamic balancing of propfan engine rotor forces and couples based on MIPV characterization of unbalanced response is as follows: Figure 1 As shown. A MEMS triaxial vibration acceleration sensor is used to extract the fundamental frequency vibration signals of the two fixed bearing support planes E1 and E2 in the horizontal and vertical directions of the propfan engine rotor at 3060rpm. Then the dynamic balancing effect of this method is compared with that of the harmonic component and dual-plane influence coefficient method.

[0095] The dynamic balancing process of this method is as follows:

[0096] (1) Use the MEMS triaxial acceleration vibration sensor to accurately identify the fundamental frequency vibration signal of the propfan engine rotor and obtain the bearing support plane E 1 、E 2 The horizontal and vertical fundamental frequency vibration of the propeller fan engine rotor (O 1h , O 1v , O 2h , O 2v ).

[0097] (2) 1h , O 1v ) and (O 2h , O 2v ) respectively synthesize the fundamental frequency elliptical axis trajectory of the propfan engine rotor, calculate the sine and cosine coefficients in the x and y directions through equation (3), and calculate the major axis of the propfan engine rotor ellipse (p O1 、p O2 ) and the minor axis (q O1 ,q O2 ).

[0098] (3) The propfan engine rotor initial unbalance response (MIPV) is calculated by equations (5) and (9): 1 MIPV 2 ), the symmetric and antisymmetric components (O s0 , O d0 ).

[0099] (4) On the counterweight plate D 1 , D 2 Add a test weight Repeat steps (1-3) to obtain the propfan engine rotor weight test unbalance response (MIPV 3 MIPV 4 ), symmetric and antisymmetric components in the vibration variation of the propfan engine rotor (O s1 , O d1 ).

[0100] (5) Calculate the force and couple weighted mass M of the propfan engine rotor using equation (12): Os 、M Od . Add symmetrical and antisymmetrical weights to the counterweight plate D 1 , D 2 The above synthesis, the final weighted mass Q is calculated by formula (13) O1 , Q O2 .

[0101] During the propfan engine rotor force and couple dynamic balancing test based on MIPV characterization of unbalanced response, the original and balanced MIPV of the propfan engine rotor were collected in real time by MEMS triaxial vibration acceleration sensor, and the force component and couple component in the unbalanced response were shown in Table 1 after using MIPV equivalent unbalanced response. The results show that the unbalanced vibration of the propfan engine rotor in planes E1 and E2 is reduced by 83% and 93%, the force unbalanced response is reduced by 89%, the couple is reduced by 63%, and the unbalanced response is reduced to below 5μm, with significant vibration reduction effect. This shows that this method can effectively reduce vibration and suppress the force and couple imbalance in the rotor system.

[0102] Table 1 Measurement results of this method at 3060rpm of propfan engine rotor

[0103]

[0104] When the present method, harmonic component method and double-sided influence coefficient method are used for dynamic balancing, the unbalanced mass added to the counterweight plates D1 and D2 is shown in Table 2. The results show that after dynamic balancing using this method, the amplitude of the MIPV of the propfan engine rotor in planes E1 and E2 is reduced by 83% and 93%, and the force and couple components of the unbalanced vibration are also significantly reduced. This shows that this method can effectively reduce vibration and balance the force and couple imbalance in the propfan engine rotor system.

[0105] Table 2 Weighting mass of three methods at rotor 3000 / 3060rpm

[0106]

[0107]

[0108] Comparison of vibration reduction effects of three methods Figure 7 and as shown in Table 3. Figure 7 In the figure, the red line and the blue line represent the initial unbalanced response and the unbalanced response after balancing, respectively. The results show that all methods effectively reduce the vibration amplitude, among which this method shows the most significant effect. After balancing by this method, the unbalanced response amplitude of the propfan engine rotor in planes E1 and E2 is reduced by 76.3%, 90.3%, 93.4%, and 86%, respectively, indicating that this method has better vibration reduction effect than the dual-plane influence coefficient method and the harmonious component method at most measuring points. At the same time, Table 3 can also show that this method can simultaneously monitor the unbalanced response of the propfan engine rotor in the radial horizontal and vertical directions and the two axial fixed bearing support measuring points.

[0109] Table 3 Comparison of balancing effects of three methods

[0110]

Claims

1. A propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response, characterized in that: The specific steps include: Step 1: Simulate a certain type of propfan engine structure to build a propfan engine rotor test bench to verify the propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response; use a motor to drive the rotor, and the rotor is directly connected to the drive motor through a coupling; freely control the motor speed through the rotor motor control program to achieve simulation of the rotor working condition; Step 2, the vibration acquisition system includes a photoelectric sensor, two MEMS three-axis acceleration sensors, a data acquisition system, a host computer and signal processing software; the photoelectric sensor measures the rotation speed and key phase of the rotor, and the two MEMS sensors are respectively bonded to two fixed bearing supports to collect the fundamental frequency vibration signals of the propfan engine rotor in the horizontal and vertical directions; Step 3: In the plane E1 of the fixed bearing support at the left measuring point, the fundamental frequency vibration signals in the radial horizontal and vertical directions measured on the plane of the fixed bearing support are synthesized into the fundamental frequency elliptical axis trajectory using the MEMS sensor; the fundamental frequency vibration signal of the i-th segment is expressed as: Formula (1) changes to: Where S xi and C xi is the fundamental frequency vibration signal x i The sine and cosine coefficients, S yi and C yi is the fundamental frequency vibration signal y i The sine and cosine coefficients, S xi , C xi , S yi , C yi They are: The major axis p and minor axis q of the fundamental frequency ellipse axis trajectory are expressed as: Where m = S xi 2 +C xi 2 +S yi 2 +C yi 2 , n = 2C xi S yi -2S xi C yi ; From the perspective of dynamics, the area of ​​the fundamental frequency elliptical axis trajectory represents the unbalanced vibration energy in the plane. In order to keep the total area of ​​the fundamental frequency elliptical axis trajectory unchanged, it is converted into the fundamental frequency circular axis trajectory; the radius of the fundamental frequency circular axis trajectory is defined as follows: Then the amplitude of MIPV is r, and the phase β of MIPV is calculated by the change of IPV before and after adding the test weight. After adding the test weight, the IPV in the axis trajectory of the fundamental frequency ellipse changes from becomes φ1 and φ2 are IPV respectively. and The phase change of IPV is Δφ, and the area swept by this phase change is: In the fundamental frequency circular axis trajectory, the area swept by the MIPV is expressed as: According to S1=S2, Δγ is calculated as: The phases γ1 and γ2 of MIPV before and after adding the test weight are expressed as: The process of extracting the amplitude and phase of the MIPV of plane E2 with the bearing support fixed by the right measuring point is the same as that of the left measuring point; Step 4: Use MIPV to characterize the unbalanced response of the propfan engine rotor and perform dynamic balancing of the propfan engine rotor forces and couples; In the two fixed bearing support planes E1 and E2, the original unbalanced responses are calculated to be MIPV1 and MIPV2 respectively. The weights are added simultaneously on the counterweight plates D1 and D2 of the propfan engine rotor test bench. and The unbalanced forces f1 and f2 caused by the weighting will combine with the original unbalanced forces P1 and P2 to form residual unbalanced forces F1 and F2. F1 and F2 can be decomposed into a pair of symmetrical forces F1 and F2 of equal magnitude and same direction. s , and a pair of antisymmetric forces F of equal magnitude and opposite direction c1 and F c2 , symmetrical force F s 、Antisymmetric force F c1 and F c2 They correspond to the force imbalance and couple imbalance in the system respectively; The unbalanced response of the test weights on planes E1 and E2 is MIPV3 and MIPV4; and The resulting vibration changes Δc and Δd are: Symmetrical component A of vibration variation s and the antisymmetric component A d They are: |A s |、|A d | respectively represent the amplitude of the symmetrical component and the amplitude of the antisymmetrical component of the vibration variation, α and β represent the phase; A s , A d By adding weight and Symmetrical weighting of the and antisymmetric weighting cause; Force balance weight M s And the couple balance weight M d They are: According to formula (13), the balancing mass Q to be added to the counterweight plates D1 and D2 is calculated as O1 , Q O2 for: The propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response suppresses the force and couple unbalanced vibration of the propfan engine rotor with stiffness anisotropy characteristics at the radial horizontal and vertical measuring points, as well as the two axial measuring points.

2. The propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response according to claim 1 is characterized in that: The rotor speed range is 0 to 3700rpm, covering the required test speed; two counterweight discs are installed on the rotor, with a counterweight radius of 206mm. Each disc has 24 evenly distributed threaded holes to apply simulated force and unbalanced counterweight blocks.

3. The propfan engine rotor force and couple dynamic balancing method based on MIPV characterization of unbalanced response according to claim 1 is characterized in that: The fundamental frequency vibration signal enters the host computer software through the data acquisition system, and LabVIEW and MatLab software are used to realize the dynamic balance of propfan engine rotor force and couple based on MIPV characterization of unbalanced response.

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