CN114112268A - Vibration damping verification device and vibration damping verification method for double-line pendulum vibration absorber - Google Patents

Vibration damping verification device and vibration damping verification method for double-line pendulum vibration absorber Download PDF

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CN114112268A
CN114112268A CN202111396990.1A CN202111396990A CN114112268A CN 114112268 A CN114112268 A CN 114112268A CN 202111396990 A CN202111396990 A CN 202111396990A CN 114112268 A CN114112268 A CN 114112268A
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vibration
double
transmission mechanism
vibration absorber
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CN114112268B (en
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陈卫星
熊波
刘光
邓建军
程起有
陈焕
陈洋
余莹
李新民
陈垚锋
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China Helicopter Research and Development Institute
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China Helicopter Research and Development Institute
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00—Vibration-testing of structures; Shock-testing of structures
    • G01M7/02—Vibration-testing by means of a shake table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
    • B64F5/60—Testing or inspecting aircraft components or systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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  • Aviation & Aerospace Engineering (AREA)
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Abstract

The invention discloses a vibration damping verification device and a vibration damping verification method of a double-line pendulum vibration absorber, wherein the method comprises the following steps: respectively arranging vibration sensors on the transmission mechanism along the course direction and the direction; determining the rotating speed of a transmission mechanism, the loading frequency and the loading load range of the heading force of the actuating cylinder, and the loading frequency and the loading load range of the lateral force; measuring a first vibration measurement result when the vibration damping verification device is not provided with the double-line pendulum vibration absorber; measuring a second vibration measurement result when the double-line pendulum vibration absorber is not installed on the vibration damping verification device; and comparing the second vibration measurement result with the first vibration measurement result to obtain the vibration reduction effect of the quantitative verification double-line pendulum vibration absorber. According to the technical scheme, the problems that the evaluation mode of the existing double-line pendulum vibration absorber is high in cost and long in period due to the fact that the evaluation mode needs to be verified through a helicopter flight test are solved.

Description

Vibration damping verification device and vibration damping verification method for double-line pendulum vibration absorber
Technical Field
The invention relates to the technical field of helicopter model rotor tests, in particular to a vibration damping verification device and a vibration damping verification method of a double-line pendulum vibration absorber.
Background
In the development of a helicopter, a rotor hub double-line pendulum type vibration absorber is a passive centrifugal pendulum type dynamic vibration absorber widely applied, can directly absorb vibration of a vibration source, absorb horizontal exciting force in a rotor plane, and reduce vibration load in the rotor plane, so that the vibration level of a fuselage is reduced.
The vibration reduction effect of the double-line pendulum vibration absorber is a key technical index for evaluating the design quality of the double-line pendulum vibration absorber. At present, the evaluation of the effect of the double-line pendulum vibration absorber mainly depends on the flight test verification of a helicopter, the flight test verification is direct and effective, but the cost is high, and the period is long.
Disclosure of Invention
The purpose of the invention is as follows: the embodiment of the invention provides a vibration damping verification device and a vibration damping verification method of a double-line pendulum vibration absorber, and aims to solve the problems that the evaluation mode is high in cost and long in period because the evaluation mode of the effect of the existing double-line pendulum vibration absorber needs to be verified through a helicopter flight test.
The technical scheme of the invention is as follows:
the embodiment of the invention provides a vibration damping verification device and a vibration damping verification method of a double-line pendulum vibration absorber, which comprise the following steps: the device comprises a rack 1, a machine body impedance simulation mechanism 2, a motor 3, a transmission mechanism 4 and a propeller hub load simulation loading mechanism;
wherein, the bench 1 comprises a support part 11 vertically installed on the ground, an installation table 12 vertically arranged on the support part 11, and two support tables 13;
the machine body impedance simulation mechanism 2 is arranged on the upper part of an installation table 12 of the rack 1, the motor 3 is vertically arranged on the lower part of the machine body impedance simulation mechanism 2 in the axial direction, one end of the transmission mechanism 4 is vertically arranged on the upper part of the machine body impedance simulation mechanism 2, the other end of the transmission mechanism is connected with the double-line pendulum type vibration absorber to be tested, a transmission shaft is connected with a rotating shaft of the motor 3 through a coupling, and the transmission mechanism 4 is provided with rotary power through the motor 3;
the hub load simulation loading mechanism comprises actuating cylinders 5 which are respectively arranged on the two support platforms 13, and comprises: a first actuator cylinder 51 arranged along the heading direction and a second actuator cylinder 52 arranged along the lateral direction; the first actuating cylinder 51 is fixed on a support table 13 arranged along the course, and the end part of an output shaft of the first actuating cylinder 51 is connected with the first actuating cylinder 51 in the course direction of the transmission mechanism 4; the second cylinder 52 is fixed to the support base 13 disposed laterally, and an end of an output shaft of the second cylinder 52 is connected thereto in a lateral direction of the transmission mechanism 4.
Alternatively, in the vibration damping verification apparatus of the double pendulum vibration absorber as described above,
the first actuating cylinder 51 is fixed on one side of the heading of the rack 1 through a corresponding support platform 13, the output axis of the first actuating cylinder 51 is perpendicular to the central axis of the transmission mechanism 4, and the end part of the output shaft of the first actuating cylinder 51 is connected with the heading lug of the transmission mechanism 4 through a joint bearing by a pin.
Alternatively, in the vibration damping verification apparatus of the double pendulum vibration absorber as described above,
the second actuating cylinder 52 is fixed on one side of the lateral direction of the rack 1 through a corresponding support platform 13, the output axis of the second actuating cylinder 52 is perpendicular to the central axis of the transmission mechanism 4, and the end part of the output shaft of the second actuating cylinder 52 is connected with the lateral lug of the transmission mechanism 4 through a joint bearing by a pin.
Optionally, the vibration damping verification apparatus for a double-pendulum vibration absorber as described above further includes: a double-line pendulum vibration absorber 6;
the double-line pendulum vibration absorber 6 is vertically arranged at the upper end of the transmission mechanism 4, and the double-line pendulum vibration absorber 6, the transmission mechanism 4 and the motor 3 are coaxially arranged.
Alternatively, in the vibration damping verification apparatus of the double pendulum vibration absorber as described above,
the actuator cylinder 5 is a force closed-loop actuator cylinder, and an output shaft end of the force closed-loop actuator cylinder is provided with a force sensor; the first actuator cylinder 51 and the second actuator cylinder 52 have a coordinated loading function.
An embodiment of the present invention further provides a vibration damping verification method for a twin pendulum type vibration absorber, where the vibration damping verification method is implemented by using any one of the above vibration damping verification apparatuses for a twin pendulum type vibration absorber, and the method includes:
step 1, respectively arranging vibration sensors on a transmission mechanism 4 along the course direction and the direction;
step 2, determining the rotating speed omega of the transmission mechanism 4, the loading frequency Fz of the course force Fz of the actuating cylinder 5 and the loading frequency Fx of the lateral force Fx according to the design rotating speed of the double-line pendulum vibration absorber 6;
step 3, determining a loading load range of the heading force Fz of the first actuator cylinder 51 and a loading load range of the lateral force Fx of the second actuator cylinder 52 according to the design load of the double-pendulum vibration absorber 6;
step 4, under the condition that the double-line pendulum vibration absorber 6 is not installed on the vibration damping verification device, the motor 3 drives the transmission mechanism 4 to rotate, the first actuating cylinder 51 and the second actuating cylinder 52 are used for applying heading force and lateral force respectively, and the vibration sensor is used for measuring a first vibration measurement result when the double-line pendulum vibration absorber 6 is not installed on the vibration damping verification device;
step 5, installing a double-line pendulum type vibration absorber 6 on a transmission mechanism 4 of the vibration damping verification device, driving the transmission mechanism 4 to rotate through the motor 3, respectively applying a heading force and a lateral force through a first actuating cylinder 51 and a second actuating cylinder 52, and measuring a second vibration measurement result of the vibration damping verification device when the double-line pendulum type vibration absorber 6 is installed by adopting the vibration sensor;
and 6, comparing the second vibration measurement result obtained in the step 5 with the first vibration measurement result obtained in the step 4 to obtain the vibration reduction effect of the double pendulum vibration absorber 6 through quantitative verification.
Optionally, in the vibration damping verification method of the double-line pendulum vibration absorber as described above, the step 4 includes:
step 41, under the condition that the double-line pendulum vibration absorber 6 is not installed in the vibration damping verification device, the motor 3 is adopted to drive the transmission mechanism 4 to rotate to the rotating speed omega;
step 42, applying a heading force Fz to the transmission mechanism 4 by using the first actuating cylinder 51, wherein the loading frequency of the heading force is Fz, and applying a lateral force Fx to the transmission mechanism 4 by using the second actuating cylinder 52, wherein the loading frequency Fx of the lateral force is Fx; the first heading vibration Az1 and the first lateral vibration Ax1 of the transmission mechanism 4 are detected by the vibration sensors.
Alternatively, in the vibration damping verification method of the double-line pendulum vibration absorber as described above, the step 5 includes:
step 51, vertically installing the double-line pendulum type vibration absorber 6 at the upper end of the transmission mechanism 4, and coaxially installing the double-line pendulum type vibration absorber 6, the transmission mechanism 4 and the motor 3;
step 52, driving the transmission mechanism 4 to rotate to a rotation speed omega by using the motor 3;
step 53, applying a heading force Fz to the transmission mechanism 4 by using the first actuating cylinder 51, wherein the loading frequency of the heading force is Fz, and applying a lateral force Fx to the transmission mechanism 4 by using the second actuating cylinder 52, wherein the loading frequency Fx of the lateral force is Fx; the second heading vibration Az2 and the second lateral vibration Ax2 of the transmission mechanism 4 are collected through the vibration sensor.
Alternatively, in the vibration damping verification method of the double-line pendulum vibration absorber as described above, the step 6 includes:
step 61, calculating the heading vibration absorption efficiency of the double-pendulum vibration absorber 6 according to the first heading vibration Az1 and the second heading vibration Az2 as follows:
ηz＝(Az1-Az2)/Az1*100％；
in step 62, based on the first lateral vibration Ax1 and the second lateral vibration Ax2, the lateral vibration absorption efficiency of the twin-wire pendulum vibration absorber 6 is calculated as:
ηx＝(Ax1-Ax2)/Ax1*100％。
alternatively, in the vibration damping verification method of the twin pendulum vibration absorber as described above, the step 42 includes, with the design load of the twin pendulum vibration absorber 6 as 100% load:
loading the heading force Fz and the lateral force Fx with 50% load, 75% load and 100% load respectively, and acquiring corresponding first heading vibration Az1 and first lateral vibration Ax1 under each load;
said step 53 comprises:
loading the heading force Fz and the lateral force Fx with 50% load, 75% load and 100% load respectively, and acquiring corresponding second heading vibration Az2 and second lateral vibration Ax2 under each load;
the step 6 comprises the following steps:
and comparing the second vibration measurement result obtained by measurement under each load with the first vibration measurement result obtained by measurement under the load to obtain a quantification result of the vibration damping effect of the double pendulum vibration absorber 6 under different loads.
The invention has the beneficial effects that:
the embodiment of the invention provides a vibration damping verification device and a vibration damping verification method of a double-line pendulum vibration absorber, which can realize the running state of the double-line pendulum vibration absorber, can realize the simulation loading of the load of a propeller hub and the simulation of the impedance of a machine body, carry out vibration measurement on the double-line pendulum vibration absorber installed on the vibration damping verification device, compare the obtained second vibration measurement result with the first vibration measurement result when the double-line pendulum vibration absorber is not installed on the vibration damping verification device, and obtain the vibration damping effect of the quantitative verification double-line pendulum vibration absorber. In the two measurements, the vibration damping verification device is in the same test state, and the rotating speed of the vibration damping verification device and the simulation loading force and frequency of the hub load of the vibration damping verification device are the same.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a vibration damping verification apparatus of a dual pendulum vibration absorber according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for verifying vibration damping of a dual pendulum vibration absorber according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The above background art has demonstrated that currently, evaluation of the effect of the double pendulum vibration absorber mainly depends on helicopter flight test verification, thereby causing the problems of high cost and long period of the evaluation mode.
Aiming at the difficulty of evaluating the vibration reduction effect of the double-line pendulum type vibration absorber, the embodiment of the invention provides a vibration reduction verification device and a vibration reduction verification method of the double-line pendulum type vibration absorber, and ground verification of the vibration reduction effect of the double-line pendulum type vibration absorber is realized through simulation loading of a propeller hub load and simulation of body impedance.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
In order to realize the operation state of the double-line pendulum vibration absorber, the load simulation loading of a propeller hub can be realized, and the impedance simulation of a machine body can be realized.
In a first aspect, an embodiment of the present invention provides a vibration damping verification apparatus for a double pendulum vibration absorber, and as shown in fig. 1, is a schematic structural diagram of the vibration damping verification apparatus for a double pendulum vibration absorber according to the embodiment of the present invention. The basic structure of the vibration damping verification device of the double pendulum vibration absorber may include: the device comprises a rack 1, a machine body impedance simulation mechanism 2, a motor 3, a transmission mechanism 4 and a propeller hub load simulation loading mechanism.
In the structure of the vibration damping verification apparatus of the double pendulum vibration absorber shown in fig. 1, a stand 1 is installed on the ground, is located at the bottom of the entire vibration damping verification apparatus, and is used for supporting the structure of the entire apparatus; the stand 1 includes a support 11 vertically installed on the ground, a mounting table 12 vertically disposed on the support 11, and two support tables 13.
The body impedance simulation mechanism 2 in the embodiment of the present invention is mounted on the upper portion of the mounting table 12 of the gantry 1.
The motor 3 in the embodiment of the invention is vertically arranged at the lower part of the body impedance simulation mechanism 2 in the axial direction and provides rotary power for the transmission mechanism 4.
One end of a transmission mechanism 4 in the embodiment of the invention is vertically arranged at the upper part of the body impedance simulation mechanism 2, the other end of the transmission mechanism is connected with the double-line pendulum type vibration absorber to be tested, and a transmission shaft is connected with a rotating shaft of a motor 3 through a coupling and provides rotary power for the motor 3.
The hub load simulation loading mechanism in the embodiment of the invention comprises: actuators 5 mounted on two support tables 13, respectively, the actuators 5 being mounted on the gantry 1, the actuators 5 may comprise: a first actuator cylinder 51 arranged along the heading direction and a second actuator cylinder 52 arranged along the lateral direction; the first actuating cylinder 51 is fixed on the support table 13 arranged along the course, and the end part of the output shaft of the first actuating cylinder 51 is connected with the transmission mechanism 4 in the course direction; the second cylinder 52 is fixed to the support table 13 disposed laterally, and the end of the output shaft of the second cylinder 52 is connected thereto in the lateral direction of the transmission mechanism 4.
In one implementation manner of the embodiment of the present invention, the first actuator cylinder 51 is fixed to one side of the heading of the gantry 1 through the corresponding support platform 13, the output axis of the first actuator cylinder 51 is perpendicular to the central axis of the transmission mechanism 4, and the end of the output shaft of the first actuator cylinder 51 is connected with the heading lug of the transmission mechanism 4 through a joint bearing by a pin.
In one mode of realization of the embodiment of the invention, the second actuator cylinder 52 is fixed on one side of the lateral direction of the gantry 1 through the corresponding support platform 13, the output axis of the second actuator cylinder 52 is perpendicular to the central axis of the transmission mechanism 4, and the end of the output shaft of the second actuator cylinder 52 is connected with the lateral lug of the transmission mechanism 4 through a joint bearing by a pin.
As shown in fig. 1, the vibration damping verification apparatus for a double-line pendulum vibration absorber according to an embodiment of the present invention may further include: a double pendulum absorber 6.
The double pendulum vibration absorber 6 is vertically installed at the upper end of the transmission mechanism 4, and the double pendulum vibration absorber 6, the transmission mechanism 4 and the motor 3 are coaxially installed.
In a possible embodiment of the invention, the actuator cylinder 5 is a force closed-loop actuator cylinder, the output shaft end of which is provided with a force sensor; and the first actuator cylinder 51 and the second actuator cylinder 52 have a coordinated loading function.
The vibration damping verification device of the double-line pendulum vibration absorber provided by the above embodiments of the present invention is provided. In a second aspect, the embodiment of the present invention further provides a method for verifying vibration damping of a double-pendulum vibration absorber, which may specifically be implemented by using the device for verifying vibration damping of a double-pendulum vibration absorber according to any of the above embodiments of the present invention, as shown in fig. 2, which is a flowchart of the method for verifying vibration damping of a double-pendulum vibration absorber according to the embodiment of the present invention, the method for verifying vibration damping measures vibration data of a specific position when the double-pendulum vibration absorber is not installed in the device under each test state, and measures vibration data of the specific position when the double-pendulum vibration absorber is installed in the device under each test state; the vibration data for both under the same test conditions were compared. The vibration reduction verification method provided by the embodiment of the invention specifically comprises the following steps:
step 1, respectively arranging vibration sensors on a transmission mechanism 4 along the course direction and the direction;
step 2, determining the rotating speed omega of the transmission mechanism 4, the loading frequency Fz of the course force Fz of the actuating cylinder 5 and the loading frequency Fx of the lateral force Fx according to the design rotating speed of the double-line pendulum vibration absorber 6;
step 3, determining a loading load range of the heading force Fz of the first actuator cylinder 51 and a loading load range of the lateral force Fx of the second actuator cylinder 52 according to the design load of the double-pendulum vibration absorber 6;
step 4, under the condition that the double-line pendulum vibration absorber 6 is not installed on the vibration damping verification device, the motor 3 drives the transmission mechanism 4 to rotate, the first actuating cylinder 51 and the second actuating cylinder 52 are used for respectively applying heading force and lateral force, and a vibration sensor is used for measuring a first vibration measurement result when the double-line pendulum vibration absorber 6 is not installed on the vibration damping verification device;
step 5, installing a double-line pendulum type vibration absorber 6 on a transmission mechanism 4 of the vibration damping verification device, driving the transmission mechanism 4 to rotate through a motor 3, respectively applying heading force and lateral force through a first actuating cylinder 51 and a second actuating cylinder 52, and measuring a second vibration measurement result when the double-line pendulum type vibration absorber 6 is installed on the vibration damping verification device by adopting a vibration sensor;
and 6, comparing the second vibration measurement result obtained in the step 5 with the first vibration measurement result obtained in the step 4 to obtain the vibration reduction effect of the quantitative verification double-line pendulum type vibration absorber 6.
The specific implementation process of measuring the first vibration measurement result in step 4 in the embodiment of the present invention may include:
step 41, under the condition that the double-line pendulum vibration absorber 6 is not installed in the vibration damping verification device, the motor 3 is adopted to drive the transmission mechanism 4 to rotate to the rotating speed omega;
step 42, applying a heading force Fz to the transmission mechanism 4 by adopting a first actuator cylinder 51, wherein the loading frequency of the heading force is Fz, and applying a lateral force Fx to the transmission mechanism 4 by adopting a second actuator cylinder 52, wherein the loading frequency Fx of the lateral force is Fx; the first heading vibration Az1 and the first lateral vibration Ax1 of the transmission mechanism 4 are detected by the vibration sensors.
The specific implementation process of measuring the second vibration measurement result in step 5 in the embodiment of the present invention may include:
step 51, vertically installing the double-line pendulum type vibration absorber 6 at the upper end of the transmission mechanism 4, and coaxially installing the double-line pendulum type vibration absorber 6, the transmission mechanism 4 and the motor 3;
step 52, driving the transmission mechanism 4 to rotate to a rotation speed omega by using the motor 3;
step 53, applying a heading force Fz to the transmission mechanism 4 by adopting the first actuating cylinder 51, wherein the loading frequency of the heading force is Fz, and applying a lateral force Fx to the transmission mechanism 4 by adopting the second actuating cylinder 52, wherein the loading frequency Fx of the lateral force is Fx; the second heading vibration Az2 and the second lateral vibration Ax2 of the transmission mechanism 4 are collected through the vibration sensor.
In an embodiment of the present invention, the implementation process of step 6 may include:
step 61, calculating the heading vibration absorption efficiency of the double-line pendulum type vibration absorber 6 according to the first heading vibration Az1 and the second heading vibration Az2 as follows:
ηz＝(Az1-Az2)/Az1*100％；
in step 62, the lateral vibration absorption efficiency of the double-line pendulum vibration absorber 6 is calculated as follows according to the first lateral vibration Ax1 and the second lateral vibration Ax 2:
ηx＝(Ax1-Ax2)/Ax1*100％。
for example, schematically illustrating the design load of the twin-wire pendulum vibration absorber 6 as 100% load, the specific implementation of step 42 may include:
respectively loading a heading force Fz and a lateral force Fx with 50% load, 75% load and 100% load, and acquiring a first heading vibration Az1 and a first lateral vibration Ax1 corresponding to each load;
accordingly, the step 53 may include:
respectively loading a heading force Fz and a lateral force Fx with 50% load, 75% load and 100% load, and acquiring corresponding second heading vibration Az2 and second lateral vibration Ax2 under each load;
accordingly, the step 6 may include:
and comparing the second vibration measurement result obtained by measurement under each load with the first vibration measurement result obtained by measurement under the load to obtain a quantification result of the vibration damping effect of the double pendulum vibration absorber 6 under different loads.
The vibration damping verification device and the vibration damping verification method for the double-line pendulum vibration absorber provided by the embodiment of the invention can realize the running state of the double-line pendulum vibration absorber, can realize the simulation loading of the load of a propeller hub and can realize the simulation of the impedance of a machine body, the double-line pendulum vibration absorber installed on the vibration damping verification device is subjected to vibration measurement, the obtained second vibration measurement result is compared with the first vibration measurement result when the double-line pendulum vibration absorber is not installed on the vibration damping verification device, and the vibration damping effect of the double-line pendulum vibration absorber is quantitatively verified. In the two measurements, the vibration damping verification device is in the same test state, and the rotating speed of the vibration damping verification device and the simulation loading force and frequency of the hub load of the vibration damping verification device are the same.
The following schematically illustrates an embodiment of a vibration damping verification apparatus and a vibration damping verification method for a dual pendulum vibration absorber according to an embodiment of the present invention.
The purpose of the vibration damping verification device and the vibration damping verification method of the double pendulum vibration absorber provided by the embodiment is as follows: the running state of the double-line pendulum vibration absorber can be realized, the simulation loading of the load of the propeller hub can be realized, the simulation of the impedance of the engine body can be realized, the vibration measurement is carried out on the double-line pendulum vibration absorber installed on the vibration damping verification device, the obtained second vibration measurement result is compared with the first vibration measurement result when the double-line pendulum vibration absorber is not installed on the vibration damping verification device, and the vibration damping effect of the double-line pendulum vibration absorber is quantitatively verified.
In view of the above object, the present embodiment provides, in the first place, a vibration damping verification apparatus for a twin-wire pendulum vibration absorber, as shown in fig. 1, the apparatus comprising:
the stand 1 includes a support 11 vertically installed on the ground, a mounting table 12 vertically disposed on the support 11, and two support tables 13;
the body impedance simulation mechanism 2 is arranged on the upper part of the mounting table 12 of the rack 1;
the motor 3 is vertically arranged at the lower part of the body impedance simulation mechanism 2 in the axial direction and provides rotary power for the transmission mechanism 4;
one end of a transmission mechanism 4 is vertically arranged at the upper part of the body impedance simulation mechanism 2, the other end of the transmission mechanism is connected with the double-line pendulum type vibration absorber to be tested, and a transmission shaft is connected with a rotating shaft of the motor 3 through a coupling and provides rotary power for the motor 3;
a ram 5, the ram 5 being mounted on the gantry 1, the ram 5 may include: a first actuator cylinder 51 arranged along the heading direction and a second actuator cylinder 52 arranged along the lateral direction; the first actuating cylinder 51 is fixed on the support table 13 arranged along the course, and the end part of the output shaft of the first actuating cylinder 51 is connected with the transmission mechanism 4 in the course direction; the second cylinder 52 is fixed to the support table 13 disposed laterally, and the end of the output shaft of the second cylinder 52 is connected thereto in the lateral direction of the transmission mechanism 4;
the double-line pendulum vibration absorber 6 is vertically installed at the upper end of the transmission mechanism 4, and the double-line pendulum vibration absorber 6, the transmission mechanism 4 and the motor 3 are coaxially installed.
Optionally, the actuator cylinder 5 in this embodiment is a closed loop actuator cylinder with a force sensor at the output shaft end.
Optionally, the first ram 51 and the second ram 52 in this embodiment are provided with a coordinated loading function.
Based on the vibration damping verification device for the double-line pendulum vibration absorber provided by the specific embodiment, the specific embodiment also provides a vibration damping verification method for the double-line pendulum vibration absorber, which comprises the steps of measuring vibration data of a specific position when the double-line pendulum vibration absorber is not installed in the device under each test state, and measuring vibration data of the specific position when the double-line pendulum vibration absorber is installed in the device under each test state; comparing the vibration data of the two under the same test condition, as shown in fig. 2, the vibration damping verification method comprises the following steps:
s1: installing an organism impedance simulation mechanism 2 on the upper part of the center of the rack 1, vertically installing a motor 3 on the lower part of the organism impedance simulation mechanism 2, vertically installing one end of a transmission mechanism 4 on the upper part of the organism impedance simulation mechanism 2, installing an actuating cylinder 5 on the rack 1, and respectively connecting a first actuating cylinder 51 and a second actuating cylinder 52 with the transmission mechanism 4 through joint bearings;
s2: vibration sensors are respectively arranged on the transmission mechanism 4 along the course direction and the direction finding direction;
s3: determining the rotating speed omega of the transmission mechanism 4, the loading frequency Fz of the heading force Fz of the actuating cylinder 5 and the loading frequency Fx of the lateral force Fx according to the design rotating speed of the double-line pendulum vibration absorber 6;
fx＝4*(Ω/60)；
fz＝4*(Ω/60)；
wherein Ω is the rotational speed of the transmission mechanism 4;
s4: determining a loading load range of a heading force Fz of the first actuator cylinder 51 and a loading load range of a lateral force Fx of the second actuator cylinder 52 according to the design load of the double pendulum vibration absorber 6;
s5: a motor 3 is adopted to drive a transmission mechanism 4 to rotate at a speed omega;
s6: applying a heading force Fz to the transmission mechanism 4 by adopting the first actuator cylinder 51, wherein the loading frequency of the heading force is Fz; applying a lateral force Fx to the transmission 4 using the second actuator 52, with the lateral force being applied at a frequency Fx; acquiring first course vibration Az1 and first lateral vibration Ax1 of the transmission mechanism 4 in a corresponding state through a vibration sensor; obtaining a first vibration measurement result when the double-line pendulum vibration absorber is not installed on the vibration damping verification device;
s7: vertically installing a double-line pendulum type vibration absorber 6 at the upper end of a transmission mechanism 4, and coaxially installing the double-line pendulum type vibration absorber 6, the transmission mechanism 4 and a motor 3;
s8: a motor 3 is adopted to drive a transmission mechanism 4 to rotate at a speed omega;
s9: applying a heading force Fz to the transmission mechanism 4 by adopting the first actuator cylinder 51, wherein the loading frequency of the heading force is Fz; the second actuator cylinder 52 exerts a lateral force Fx on the transmission 4, with the lateral force being applied at a frequency Fx; collecting second course vibration Az2 and second lateral vibration Ax2 corresponding to a specific position of the state transmission mechanism; obtaining a second vibration measurement result when the double-line pendulum vibration absorber is installed on the vibration damping verification device;
s10: based on the fact that the first heading vibration Az1 of the specific position of the transmission mechanism 4 when the double-wire pendulum vibration absorber 6 is not installed in the device is subtracted by the second heading vibration Az2 of the specific position of the transmission mechanism 4 when the double-wire pendulum vibration absorber 6 is installed in the device, the heading vibration absorption efficiency of the double-wire pendulum vibration absorber 6 is calculated as follows:
ηz＝(Az1-Az2)/Az1*100％；
s11: based on the subtraction of the second lateral vibration Ax2 of the specific position of the transmission mechanism 4 when the dual-wire pendulum absorber 6 is installed from the first lateral vibration Ax1 of the specific position of the transmission mechanism 4 when the dual-wire pendulum absorber 6 is not installed in the device, the lateral vibration absorption efficiency of the dual-wire pendulum absorber 6 is calculated as:
ηx＝(Ax1-Ax2)/Ax1*100％。
in one possible implementation of this embodiment, in step S4, it is determined that the range of the heading force Fz of the first ram 51 and the range of the lateral force Fx of the second ram 52 do not exceed 100% of the design criteria;
in one possible implementation of this embodiment, in step S6, the first ram 51 and the second ram 52 are loaded in coordination, and the phase difference between the coordinated loading is 90 °.
In one possible implementation of this embodiment, in step S9, the first ram 51 and the second ram 52 are loaded in coordination, and the phase difference between the coordinated loading is 90 °.
The following is illustrated by way of an example.
First, the twin pendulum absorber 6 is designed as follows:
rotating speed: 240 r/min;
the design load includes:
lateral exciting force: less than or equal to 1200N;
course exciting force: less than or equal to 1800N;
and determining the device rotating speed omega as 240r/min, the lateral force Fx loading frequency Fx and the heading force Fz loading frequency Fz according to the design rotating speed of the double-wire pendulum vibration absorber 6.
fx＝4*(Ω/60)＝16Hz；
fz＝4*(Ω/60)＝16Hz；
Taking 100% of design load as an example for testing, and stabilizing the rotating speed of the transmission mechanism 4 when the rotating speed reaches 240 r/min; the first actuating cylinder 51 applies course force to the transmission mechanism 4, and the course loading frequency is 1800N @16 Hz; the second actuator cylinder 52 applies a heading force to the transmission 4 and a side loading frequency of 1200N @16 Hz.
When the double-wire pendulum vibration absorber is not installed in the device, the first course vibration Az1 of a specific position of the transmission mechanism 4 of the device is 0.60g, and the first lateral vibration Ax1 is 0.52 g;
when the double-wire pendulum vibration absorber is installed on the device, the second course vibration Az2 of a specific position of the transmission mechanism 4 of the device is 0.36g, and the second lateral vibration Ax2 is 0.20 g;
ηz＝(Az1-Az2)/Az1*100％＝40.0％；
ηx＝(Ax1-Ax2)/Ax1*100％＝61.5％。
although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A vibration damping verification device of a double-wire pendulum vibration absorber is characterized by comprising: the device comprises a rack (1), a machine body impedance simulation mechanism (2), a motor (3), a transmission mechanism (4) and a propeller hub load simulation loading mechanism;
wherein the bench (1) comprises a support part (11) vertically mounted on the ground, a mounting table (12) vertically arranged on the support part (11), and two support tables (13);
the machine body impedance simulation mechanism (2) is arranged on the upper part of an installation table (12) of the rack (1), the motor (3) is vertically arranged on the lower part of the machine body impedance simulation mechanism (2) in the axial direction, one end of the transmission mechanism (4) is vertically arranged on the upper part of the machine body impedance simulation mechanism (2), the other end of the transmission mechanism is connected with the double-line pendulum type vibration absorber to be tested, the transmission shaft is connected with a rotating shaft of the motor (3) through a coupling, and rotary power is provided for the transmission mechanism (4) through the motor (3);
the hub load simulation loading mechanism comprises actuating cylinders (5) which are respectively arranged on the two supporting platforms (13), and comprises: a first actuator cylinder (51) arranged along the heading direction and a second actuator cylinder (52) arranged along the lateral direction; the first actuating cylinder (51) is fixed on a support table (13) arranged along the course, and the end part of an output shaft of the first actuating cylinder (51) is connected with the transmission mechanism (4) in the course direction; the second actuator cylinder (52) is fixed to a support table (13) arranged laterally, and an end of an output shaft of the second actuator cylinder (52) is connected to the transmission mechanism (4) in a lateral direction thereof.
2. The vibration damping verification apparatus for a dual-line pendulum vibration absorber according to claim 1,
the first actuating cylinder (51) is fixed on one side of the heading of the rack (1) through a corresponding support table (13), the output axis of the first actuating cylinder (51) is perpendicular to the central axis of the transmission mechanism (4), and the end part of the output shaft of the first actuating cylinder (51) is connected with the heading lug of the transmission mechanism (4) through a joint bearing by a pin.
3. The vibration damping verification apparatus for a double-wire pendulum vibration absorber according to claim 2,
the second actuating cylinder (52) is fixed on one side of the lateral direction of the rack (1) through a corresponding support table (13), the output axis of the second actuating cylinder (52) is perpendicular to the central axis of the transmission mechanism (4), and the end part of the output shaft of the second actuating cylinder (52) is connected with the lateral lug of the transmission mechanism (4) through a joint bearing by a pin.
4. The device for verifying vibration damping of a double-wire pendulum vibration absorber according to any one of claims 1 to 3, further comprising: a double-line pendulum vibration absorber (6);
the double-line pendulum vibration absorber (6) is vertically arranged at the upper end of the transmission mechanism (4), and the double-line pendulum vibration absorber (6), the transmission mechanism (4) and the motor (3) are coaxially arranged.
5. The vibration damping verification device for a double-wire pendulum vibration absorber according to any one of claims 1 to 3,
the actuator cylinder (5) is a force closed-loop actuator cylinder, and an output shaft end of the force closed-loop actuator cylinder is provided with a force sensor; the first actuator cylinder (51) and the second actuator cylinder (52) have a coordinated loading function.
6. A vibration damping verification method of a twin-wire pendulum vibration absorber, characterized in that the vibration damping verification method is performed using the vibration damping verification apparatus of a twin-wire pendulum vibration absorber according to any one of claims 1 to 5, the method comprising:
step 1, respectively arranging vibration sensors on a transmission mechanism (4) along the course direction and the direction finding direction;
step 2, determining the rotating speed omega of the transmission mechanism (4), and the loading frequency Fz of the course force Fz and the loading frequency Fx of the lateral force Fx of the actuating cylinder (5) according to the design rotating speed of the double-line pendulum vibration absorber (6);
step 3, determining a loading load range of a heading force Fz of the first actuating cylinder (51) and a loading load range of a lateral force Fx of the second actuating cylinder (52) according to the design load of the double-pendulum vibration absorber (6);
step 4, under the condition that the double-line pendulum vibration absorber (6) is not installed on the vibration damping verification device, the motor (3) drives the transmission mechanism (4) to rotate, the first actuating cylinder (51) and the second actuating cylinder (52) are used for applying heading force and lateral force respectively, and the vibration sensor is used for measuring a first vibration measurement result when the double-line pendulum vibration absorber (6) is not installed on the vibration damping verification device;
step 5, installing a double-line pendulum vibration absorber (6) on a transmission mechanism (4) of the vibration damping verification device, driving the transmission mechanism (4) to rotate through the motor (3), respectively applying a heading force and a lateral force through a first actuating cylinder (51) and a second actuating cylinder (52), and measuring a second vibration measurement result when the double-line pendulum vibration absorber (6) is installed on the vibration damping verification device by adopting the vibration sensor;
and 6, comparing the second vibration measurement result obtained in the step 5 with the first vibration measurement result obtained in the step 4 to obtain the vibration reduction effect of the double-pendulum vibration absorber (6) through quantitative verification.
7. The method for verifying vibration damping of a double-wire pendulum vibration absorber according to claim 6, wherein said step 4 comprises:
step 41, under the condition that the double-line pendulum vibration absorber (6) is not installed in the vibration damping verification device, a motor (3) is adopted to drive a transmission mechanism (4) to rotate to a rotating speed omega;
step 42, applying a heading force Fz to the transmission mechanism (4) by using the first actuating cylinder (51), wherein the loading frequency of the heading force is Fz, and applying a lateral force Fx to the transmission mechanism (4) by using the second actuating cylinder (52), wherein the loading frequency Fx of the lateral force is Fx; the first course vibration Az1 and the first lateral vibration Ax1 of the transmission mechanism (4) are collected through a vibration sensor.
8. The method for verifying vibration damping of a double-wire pendulum vibration absorber according to claim 7, wherein said step 5 comprises:
step 51, vertically installing the double-line pendulum type vibration absorber (6) at the upper end of the transmission mechanism (4), and coaxially installing the double-line pendulum type vibration absorber (6), the transmission mechanism (4) and the motor (3);
step 52, driving the transmission mechanism (4) to rotate to a rotating speed omega by adopting the motor (3);
step 53, applying a heading force Fz to the transmission mechanism (4) by using the first actuating cylinder (51), wherein the loading frequency of the heading force is Fz, and applying a lateral force Fx to the transmission mechanism (4) by using the second actuating cylinder (52), wherein the loading frequency Fx of the lateral force is Fx; the second heading vibration Az2 and the second lateral vibration Ax2 of the transmission mechanism (4) are collected through a vibration sensor.
9. The method for verifying vibration damping of a double-wire pendulum vibration absorber according to claim 8, wherein said step 6 comprises:
and step 61, calculating the heading vibration absorption efficiency of the double-line pendulum type vibration absorber (6) according to the first heading vibration Az1 and the second heading vibration Az2 as follows:
ηz＝(Az1-Az2)/Az1*100％；
step 62, calculating the lateral vibration absorption efficiency of the double-wire pendulum vibration absorber (6) according to the first lateral vibration Ax1 and the second lateral vibration Ax2 as follows:
ηx＝(Ax1-Ax2)/Ax1*100％。
10. the method for verifying vibration damping of a double-wire pendulum vibration absorber according to claim 8, wherein said step 42 comprises, with the design load of said double-wire pendulum vibration absorber (6) being 100% load:
loading the heading force Fz and the lateral force Fx with 50% load, 75% load and 100% load respectively, and acquiring corresponding first heading vibration Az1 and first lateral vibration Ax1 under each load;
said step 53 comprises:
loading the heading force Fz and the lateral force Fx with 50% load, 75% load and 100% load respectively, and acquiring corresponding second heading vibration Az2 and second lateral vibration Ax2 under each load;
the step 6 comprises the following steps:
and comparing the second vibration measurement result obtained by measurement under each load with the first vibration measurement result obtained by measurement under the load to obtain the quantification result of the vibration reduction effect of the double pendulum type vibration absorber (6) under different loads.
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