A method for testing three translational motion cross impedance parameters of a three translational motion cross isolator

Abstract

The present application relates to the field of three translational motion cross vibration isolator characteristic research, specifically relates to a kind of three translational motion cross vibration isolator three translational motion cross impedance parameter test method, the output and input of three translational motion cross vibration isolator are respectively measured in the clamping state excitation force, transmission force and response, obtain the impedance matrix of three translational motion cross vibration isolator, the method for obtaining three translational motion cross vibration isolator translational motion cross impedance parameter is proposed, fill the blank of the method for obtaining three translational motion cross vibration isolator translational motion cross impedance parameter.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of three translational motion cross-vibration isolator characteristics, and particularly relates to a three translational motion cross-vibration isolator three translational motion cross-impedance parameter testing method. BACKGROUND

[0002] The translational motion cross-impedance of a vibration isolator is an important parameter for describing the translational motion coupling characteristics of the vibration isolator, and obtaining the translational motion cross-impedance parameter is an important part of calculating the coupling transmission characteristics of the vibration isolator. The translational motion direct (the excitation direction and the vibration response direction are the same) impedance parameter of a three translational motion independent (non-cross) vibration isolator has been obtained by a related method, but there is no method for obtaining the translational motion cross-impedance parameter of a three translational motion cross vibration isolator, which is not conducive to calculating the coupling characteristic parameters of the vibration isolator. SUMMARY

[0003] To solve the above problems, the present application provides a three translational motion cross-vibration isolator three translational motion cross-impedance parameter testing method.

[0004] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0005] A three translational motion cross-vibration isolator three translational motion cross-impedance parameter testing method, comprising the following steps:

[0006] S1, clamp and install one end of the vibration isolator and install related test equipment

[0007] First, a clamping platform is built, the mounting surface of the clamping platform is horizontally arranged, a three translational motion lower end force measuring device is installed on the clamping platform, the upper and lower mounting surfaces of the three translational motion lower end force measuring device are kept horizontal, the first order elastic modal frequency thereof is greater than the upper limit frequency of the impedance test, and the three translational motion lower end force measuring device is used for independently measuring the three translational motion transmission dynamic forces of the vibration isolator; then a measured vibration isolator is installed on the upper end of the three translational motion lower end force measuring device, a vibration excitation rod and a vibration exciter are connected in sequence on the upper end of the measured vibration isolator through a three translational motion upper end force measuring device, the three translational motion upper end force measuring device is used for measuring the three translational motion transmission dynamic forces of the vibration isolator, the upper and lower mounting surfaces are kept horizontal, the excitation direction is consistent with the cross-impedance measurement direction, the highest excitation frequency is not less than the upper limit frequency of the impedance test, and the mass m of the upper end force measuring device is recorded, the installation frequency of the vibration exciter is not greater than 1 / 3 of the lower limit frequency of the impedance test, a single frequency or wide frequency excitation mode is adopted, and a single direction acceleration sensor is arranged on the three translational motion upper end force measuring device, and the acceleration measurement direction of the single direction acceleration sensor is the cross-impedance measurement direction;

[0008] S2, obtain the translational motion acceleration and excitation force data

[0009] The upper end three-way force measuring device, the lower end three-way force measuring device and the dynamic force in the cross impedance measurement direction are consistent with the reference, the exciter is opened, the dynamic force F of the lower end three-way force measuring device and the cross impedance measurement direction is measured and obtained 下1 , the dynamic force of the upper end three-way force measuring device and the cross impedance measurement direction And the acceleration complex values of the acceleration sensor are recorded respectively with And F 下1 As the reference The values of And F Are calculated, recorded as F 上1 , the upper and And Are time-integrated to obtain the corresponding velocity complex values V1 上 And V1 下 ;

[0010] S3, clamp the reverse mounting vibration isolator and obtain the related parameters according to steps S1 and S2

[0011] The vibration isolator is mounted reversely, the installation of the related test equipment is completed according to step S1, F 下2 , And The values of F Are calculated, recorded as F 上2 , and And Are time-integrated to obtain the corresponding velocity complex values V2 上 And V2 下 ;

[0012] S4, calculate and obtain the cross impedance matrix

[0013] Using the data obtained in steps S2 and S3, F 上1 / V1 上 Is calculated as Z 11 , F 下1 / V1 下 Is calculated as Z 21 , F 上2 / V2 上 Is calculated as Z 22 , F 下2 / V2 下 Is calculated as Z 12 , and then the cross impedance matrix orthogonal to a certain excitation direction and its orthogonal direction is synthesized

[0014] In the above scheme, the impedance matrix of the three-dimensional translational cross isolator is obtained by measuring the output and input of the three-dimensional translational cross isolator in the clamped state, respectively, the excitation force, the transmission force and the response, a method for obtaining the translational cross impedance parameters of the three-dimensional translational cross isolator is proposed, and the blank of the method for obtaining the translational cross impedance parameters of the three-dimensional translational cross isolator is filled. BRIEF DESCRIPTION OF DRAWINGS

[0015] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, when read in conjunction with the accompanying drawings:

[0016] Figure 1 The measurement arrangement for obtaining the translational cross impedance parameters of the isolator in the axial excitation mode in the embodiment of the application.

[0017] Figure 2 The measurement arrangement for obtaining the translational cross impedance parameters of the isolator in the lateral excitation mode in the embodiment of the application.

[0018] Figure 3 The direction diagram of the isolator in the embodiment 1 of the application.

[0019] In the figure: 1-clamping platform; 2-three-dimensional lower end force measuring device; 3-isolator to be measured; 4-three-dimensional upper end force measuring device; 5-unidirectional acceleration sensor; 6-vibration exciter; 7-hanging spring; 8-vibration exciter rod. DETAILED DESCRIPTION

[0020] The application will be described in detail below with specific embodiments. The following embodiments will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made. These all belong to the protection scope of the application.

[0021] A test method for three-dimensional translational cross impedance parameters of a three-dimensional translational cross isolator, comprising the following steps:

[0022] S1, clamping and installing one end of the isolator and installing related test equipment

[0023] As Figures 1-2As shown, firstly, a clamping platform 1 is constructed with its mounting surface horizontal. A three-axis downward force measuring device 2 is installed on the clamping platform 1, with both its upper and lower mounting surfaces kept horizontal. Its first-order elastic mode frequency is greater than the upper limit frequency for impedance testing, and it is used to independently measure the three-dimensional transmitted dynamic force of the vibration isolator. Then, a vibration isolator 3 is installed on the upper end of the three-axis downward force measuring device 2. An excitation rod 8 and an exciter 6 are connected in series at the upper end of the vibration isolator 3 via the three-axis upward force measuring device 4. The force measuring device 4 is used to measure the dynamic force transmitted in three directions of the vibration isolator. The upper and lower mounting surfaces are kept horizontal. The excitation direction is consistent with the direction of cross impedance measurement. The highest excitation frequency is not less than the upper limit frequency of the impedance test. The mass m of the upper force measuring device is recorded. The exciter 6 is suspended by the suspension spring 7. The installation frequency is not greater than 1 / 3 of the lower limit frequency of the impedance test. A single frequency or wide frequency excitation method is adopted. A unidirectional acceleration sensor 5 is placed on the upper force measuring device in three directions. Its acceleration measurement direction is the cross impedance measurement direction.

[0024] S2. Obtain finger movement acceleration and excitation force data.

[0025] Using the dynamic force from the upper and lower triaxial force measuring devices, which are aligned with the cross-impedance measurement direction, as references, the exciter is turned on, and the dynamic force F from the lower triaxial force measuring device, aligned with the cross-impedance measurement direction, is measured. 下1 The dynamic force of the upper three-dimensional force measuring device is in the same direction as the cross impedance measurement. And record them separately. and F 下1 Complex acceleration values ​​from the accelerometer for reference Shanghe And calculate The value is denoted as F. 上1 ,right Shanghe Perform a time integration to obtain the corresponding velocity recovery value V1. 上 and V1 下 ;

[0026] S3. Clamp the reverse-mounted vibration isolator and obtain the relevant parameters according to steps S1 and S2.

[0027] Reverse the vibration isolator and complete the installation of the relevant testing equipment according to step S1, and obtain F in the same way. 下2 , and And calculate The value is denoted as F. 上2 and to and Performing a time integration yields the corresponding complex velocity value V2. 上 and V2 下 ;

[0028] S4, calculate the cross impedance matrix

[0029] Using the data obtained in steps s2 and s3, calculate F 上1 V1 上 , denoted as Z 11 , calculate F 下1 V1 下 , denoted as Z 21 , calculate F 上2 V2 上 , denoted as Z 22 , calculate F 下 / V2 下 , denoted as Z 12 , and then synthesize a cross impedance matrix orthogonal to the excitation direction and its orthogonal direction

[0030] Example 1

[0031] The ship-mounted BE-85 rubber isolator is taken as the test object, the isolator direction is specified as shown in Figure 3 , and the process of obtaining the ZY cross impedance matrix parameters is described by taking the Z direction excitation and Y direction response as an example (the measurement frequency range is 20-600 Hz).

[0032] S1, select the corresponding clamping platform, three-way force measuring device and exciter suspension spring according to the measurement frequency range

[0033] According to the upper limit of the isolator measurement frequency, select the clamping platform and two three-way force measuring devices with a first-order elastic modal frequency higher than 600 Hz, obtain the lower limit of the measurement frequency 20 Hz, combine the exciter mass m1, and according to the technical requirement that the exciter installation frequency is not greater than 1 / 3 of the test lower limit frequency, use 20 / 3 = 2π Calculate the stiffness of the suspension spring, and select a suspension spring with stiffness < k.

[0034] S2, install the isolator at one end and install the related test equipment

[0035] Install a three-way lower end force measuring device on the clamping platform, and the upper and lower installation surfaces should be kept horizontal, then install the isolator vertically on the three-way lower end force measuring device, connect the three-way upper end force measuring device to the other end of the three-way lower end force measuring device in series, and connect the exciter rod to the other end of the three-way upper end force measuring device in series, install the exciter with the selected spring suspension, and the upper and lower installation surfaces should be kept horizontal, the excitation direction is Z direction, the excitation frequency is selected as 20-600 Hz, and the mass m of the upper end force measuring device is recorded, a single frequency or wide frequency excitation method is adopted, and a single direction acceleration sensor is placed on the three-way upper end force measuring device, and the measurement direction is Y direction.

[0036] S3, obtain vibration acceleration and excitation force data

[0037] Using the Z-axis dynamic forces of the upper and lower triaxial force measuring devices as references, the exciter is turned on, and the Z-axis dynamic force of the lower triaxial force measuring device is measured and recorded as F. 下1 The Z-axis dynamic force of the upper three-axis force measuring device is denoted as And record them separately. and F 下1 Complex acceleration values ​​from the Y-axis accelerometer for reference. Shanghe And calculate The value is denoted as F. 上1 and to Shanghe Perform a time integration to obtain the corresponding complex velocity value V1. 上 and V1 下 .

[0038] S4. Reverse vibration isolator and obtain relevant parameters according to steps S2 and S3.

[0039] Reverse the vibration isolator and complete the installation of the relevant testing equipment according to step S2, and obtain F in the same way. 下2 , and And calculate The value is denoted as F. 上2 and to and Performing a time integration yields the corresponding complex velocity value V2. 上 and V2 下 .

[0040] S5. Calculate and obtain the cross impedance matrix.

[0041] Using the data obtained in steps S3 and S4, calculate F 上1 / V1 上 Z 11 Calculate F 下1 / V1 下 denoted as Z 21 Calculate F 上2 / V2 上 denoted as Z 22 Calculate F 下2 / V2 下 i is Z 12 Then, a cross impedance matrix orthogonal to a certain excitation direction is synthesized.

[0042] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A method for testing three translational degrees of freedom cross-impedance parameters of a three translational degrees of freedom cross-isolator, characterized by: Comprising the following steps: S1, clamp one end of the vibration isolator and install related test equipment First, build a clamping platform, the mounting surface of the clamping platform is horizontally arranged, install a three-way lower end force measuring device on the clamping platform, the upper and lower mounting surfaces of the three-way lower end force measuring device are kept horizontal, the first order elastic modal frequency thereof is greater than the upper limit frequency of impedance test, and the three-way lower end force measuring device is used for independently measuring the three-way transmitted dynamic force of the vibration isolator; then install a measured vibration isolator on the upper end of the three-way lower end force measuring device, sequentially connect an excitation rod and an exciter on the upper end of the measured vibration isolator through a three-way upper end force measuring device, the three-way upper end force measuring device is used for measuring the three-way transmitted dynamic force of the vibration isolator, the upper and lower mounting surfaces are kept horizontal, the excitation direction is consistent with the measurement direction of the cross impedance to be obtained, the highest excitation frequency is not less than the upper limit frequency of the impedance test, and the mass m of the upper end force measuring device is recorded, the installation frequency of the exciter is not greater than 1 / 3 of the lower limit frequency of the impedance test, a single frequency or wide frequency excitation mode is adopted, and a one-way acceleration sensor is arranged on the three-way upper end force measuring device, and the acceleration measurement direction of the one-way acceleration sensor is the measurement direction of the cross impedance; S2, obtain the acceleration and excitation force data Using the dynamic force from the upper and lower triaxial force measuring devices, which are aligned with the cross-impedance measurement direction, as references, the exciter is turned on, and the dynamic force F from the lower triaxial force measuring device, aligned with the cross-impedance measurement direction, is measured. 下1 The dynamic force of the upper three-dimensional force measuring device is in the same direction as the cross impedance measurement. And record them separately. and F 下1 Complex acceleration values ​​from the accelerometer for reference and And calculate The value is denoted as F. 上1 ,right and Perform a time integration to obtain the corresponding complex velocity value V1. 上 and V1 下 ; S3, clamp the reverse vibration isolator and obtain the related parameters according to steps S1 and S2 The isolator is mounted in reverse and the installation of the relevant test equipment is completed according to step S1, and the value of F 下2 , and is calculated , recorded as F 上2 , and a time integral is performed on and to obtain the corresponding complex velocity values V2 上 and V2 下 ; S4, calculate the cross impedance matrix Using the data obtained in steps S2 and S3, calculate F 上1 1 / V1 上 , denoted as Z 11 , calculate F 下1 / V1 下 , denoted as Z 21 , calculate F 上2 / V2 上 , denoted as Z 22 , calculate F 下2 / V2 下 , denoted as Z 12 , and then synthesize a cross impedance matrix orthogonal to the excitation direction and the orthogonal direction thereof

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