CN112525461A - Vibration test bed of multiform clamp pipe test system and frequency response test method thereof - Google Patents

Vibration test bed of multiform clamp pipe test system and frequency response test method thereof Download PDF

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CN112525461A
CN112525461A CN202011346988.9A CN202011346988A CN112525461A CN 112525461 A CN112525461 A CN 112525461A CN 202011346988 A CN202011346988 A CN 202011346988A CN 112525461 A CN112525461 A CN 112525461A
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pipeline
vibration
test
clamp
double
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罗忠
郭思伟
杨洪朋
丁喆
孙永航
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Northeastern University China
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Northeastern University China
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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
    • G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
    • 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
    • G01M7/025—Measuring arrangements
    • 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
    • G01M7/06—Multidirectional test stands

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  • Testing Of Engines (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Abstract

本发明属于航空发动机管路的频率响应测试领域，涉及多形卡箍管路测试系统振动试验台及其频率响应测试方法。该试验台主要由振动试验台、多形卡箍管路、测试传感系统、管路支撑系统和双联卡箍结构组成。首先，本试验台对比以往只能测量单联管路的普通试验台，可以测量不同的轴径多种双联和U形管路。其次，通过单个管路支撑底座实现对多形管路的测试，保证载荷传递的同步性，避免由于载荷传递不均所造成的测量误差。本发明通过双联卡箍结构并添加橡胶圈，可对发动机管路起到固定保护的作用，并且随着振动试验台的位姿，分别进行不同方向上的振动响应测试，可以保证了试验的全面性，使分析和测量更加的准确。

Figure 202011346988

The invention belongs to the field of frequency response testing of aero-engine pipelines, and relates to a vibration test bench of a multi-shaped clamp pipeline testing system and a frequency response testing method thereof. The test bench is mainly composed of vibration test bench, multi-shaped clamp pipeline, test sensing system, pipeline support system and double clamp structure. First of all, this test bench can measure a variety of double and U-shaped pipelines with different shaft diameters compared to the ordinary test benches that can only measure single-connected pipelines in the past. Secondly, the testing of multi-shaped pipelines is realized through a single pipeline support base to ensure the synchronization of load transmission and avoid measurement errors caused by uneven load transmission. Through the double clamp structure and the addition of rubber rings, the invention can play a fixed and protective role on the engine pipeline, and according to the posture of the vibration test bench, the vibration response tests in different directions can be respectively performed, which can ensure the test accuracy. Comprehensiveness makes analysis and measurement more accurate.

Figure 202011346988

Description

Vibration test bed of multiform clamp pipe test system and frequency response test method thereof
Technical Field
The invention belongs to the field of frequency response testing of aircraft engine pipelines, and relates to a vibration test bed of a multi-shaped clamp pipeline testing system and a frequency response testing method thereof.
Background
The aircraft engine is the heart of an airplane, and the technical level of the aircraft engine is the embodiment of comprehensive national strength of a country. The aircraft engine pipeline system, called the "cardiovascular system" of the aircraft engine, is mainly used for the transportation of media such as hydraulic oil, fuel oil, lubricating oil and air, and is an important component of an aircraft engine accessory device. According to the structural characteristics of an aircraft engine, the vibration of the aircraft engine is generally divided into whole machine vibration and accessory device vibration. The vibration of the whole machine mainly refers to the vibration of a turbine rotor system and blades, and the vibration of an accessory device mainly refers to the vibration of a pipeline system. Therefore, it is also necessary to know the vibration characteristics of the pipeline, which is important and important for the frequency response measurement of the pipeline system.
At present, more people in pipeline systems are single pipeline vibration response tests, and duplex and U-shaped pipeline structures are not involved. The duplex pipeline structure is an important conveying component, has the characteristics of high conveying efficiency, high reliability, low cost and the like, and is widely applied to aeroengines.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a vibration test bed of a multi-shaped clamp pipeline test system and a frequency response test method thereof. In the aspect of structure, the invention relates to a vibration test bed of a pipeline frequency response test system of an aircraft engine, which can be applied to the frequency response test of U-shaped pipelines and duplex pipelines with different shaft diameters. The central end of the multiform engine pipeline is provided with a duplex hoop. A round hole is formed in the duplex hoop, and a positioning pin is arranged on the round hole. The vibration test bed of the multiform clamp pipeline response test system mainly applies loads according to given working condition input conditions, wherein the loads are divided into sinusoidal loads and random load inputs, the loads are additionally input through the vibration test bed, screws in a circumferential array are added below a pipeline supporting base, so that the loads are transferred to achieve synchronous excitation on an engine pipeline, the multiform pipeline is tested through a single pipeline supporting base, the synchronism of load transfer is ensured, and the measurement error caused by uneven load transfer is avoided; two acceleration sensors which are parallel to each other are added on pipelines on two sides of the duplex hoop, the vibration response of the polymorphic hoop pipeline is tested, and the resonance frequency corresponding to the resonance peak value of the vibration response is considered to be the natural frequency of the polymorphic hoop pipeline.
In order to achieve the purpose, the invention adopts the following technical scheme:
a vibration test bed of a multi-shape clamp pipeline test system comprises a vibration test bed A, a test sensing system, a pipeline supporting system C and a duplex clamp structure D; the vibration test bed A comprises a vibration table and a mounting and fixing base;
the vibration test bed A comprises a vibration table and a mounting and fixing base, the mounting and fixing base is fixed above the vibration table, and the pipeline supporting system C is fixed above the mounting and fixing base;
the multiform hoop pipeline B comprises an engine duplex pipeline and a U-shaped pipeline;
the pipeline supporting system C comprises a pipeline supporting base, a duplex hoop structure D and positioning pins, wherein four threaded holes in a circumferential array are formed in the bottom of the pipeline supporting base, and four positioning screws are matched with the threaded holes to play a role in fixing the pipeline supporting base to the fixed position of the installation and fixing base of the vibration test bed;
the duplex hoop structure D comprises a duplex hoop base, a positioning pin, a rubber ring, an outer ring hoop and a locking bolt. The inner diameter shaft ring of the duplex hoop structure D is provided with a rubber ring which plays a role in fixing and protecting the multi-shape pipeline, the thickness of a base plate of the duplex hoop is 3mm, a round hole is formed in the base plate, a positioning pin is arranged on the round hole and plays a role in positioning with a pipeline supporting base, an outer ring hoop is connected with the duplex hoop base through a locking bolt, the tightening degree of the locking bolt is adaptive to the shaft diameter of the multi-shape pipeline, and the duplex hoop is suitable for the multi-shape pipelines with different shaft diameters;
the test sensing system mainly comprises an acceleration sensor and test equipment; the acceleration sensor is arranged at a pipeline near the duplex hoop structure D, one acceleration sensor is horizontally arranged on each duplex pipeline, the vibration response condition of the engine duplex pipeline in the vertical direction is measured through the acceleration sensor, the measured data is displayed by a display controller of the testing equipment and is recorded by a signal acquisition card and a signal reading and storing system, the vibration response value of the engine duplex pipeline in the vertical direction is measured, the corresponding frequency of the response value is the resonance frequency of the engine duplex pipeline, and each order of resonance frequency is the inherent frequency of the engine duplex pipeline.
A frequency response test method of a vibration test bed of a multi-form hoop pipeline test system comprises the following steps:
the method comprises the following steps: the method is characterized in that load is applied according to given working condition input conditions and comprises sinusoidal load and random load input, the load is input additionally through a vibration test bed, and the load is transmitted through four screws in a circumferential array under a pipeline supporting base so as to achieve synchronous excitation of the multi-form pipeline of the engine.
Step two: the multi-shape pipeline is tested through the single pipeline supporting base, the load transmission synchronism is guaranteed, and the measurement error caused by uneven load transmission is avoided;
step three: and (3) adding two acceleration sensors which are parallel to each other on the pipelines on two sides of the duplex hoop structure D, testing the vibration response of the engine pipeline, wherein the resonance frequency corresponding to the resonance peak value of the vibration response is the natural frequency of the multi-form hoop pipeline.
The invention has the beneficial effects that:
the test bed is additionally provided with the pipeline supporting system on the basis of the conventional common test bed, and the test on the multi-shaped pipeline is realized through the single pipeline supporting base, so that the load transfer synchronism is ensured, and the measurement error caused by uneven load transfer of the multiple pipeline supporting bases is avoided;
the double-connection hoop structure is added in the pipeline supporting system, is suitable for multi-form pipelines with different axial diameters, two acceleration sensors which are parallel to each other can be added on the pipelines on the two sides of the double-connection hoop structure, the vibration response of the multi-form hoop pipeline is tested, and the resonance frequency corresponding to the resonance peak value of the vibration response is considered as the natural frequency of the multi-form hoop pipeline.
The invention can carry out frequency response measurement on the multi-shape pipeline and can apply load input in different directions through the vibration test bed, thereby further ensuring the test accuracy and ensuring more comprehensive analysis and measurement.
Drawings
Fig. 1 is a schematic diagram of the system composition of a vibration test bed of a test system of a duplex hoop pipeline.
Fig. 2 is a schematic structural view of a vibration test bed of a test system of a U-shaped clamp pipeline.
FIG. 3 is a schematic view of a pipeline support system of the present invention.
Fig. 4 is a schematic view of a duplex clip structure of the present invention.
FIG. 5 is a schematic diagram of the fundamental excitation load spectrum of the given working condition of the present invention.
FIG. 6 is a frequency response function of the dual pipeline vibration output of the present invention.
In the figure: a, vibrating a test bed; b a multiform clamp pipeline system; c, a pipeline supporting system; 1, vibrating a table; 2, mounting a fixed base; 3, a pipeline supporting base; 4, positioning a screw; 5, a duplex hoop base; 6, positioning pins; 7, a rubber ring; an outer ring clamp 8; a locking bolt 9; a duplex pipe 10; a U-shaped pipeline 11.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
As shown in fig. 1 and 2, a vibration test bed for a test system of a multi-form clamp pipeline mainly comprises a vibration test bed a, a multi-form clamp pipeline system B, a test sensing system and a pipeline supporting system C and a duplex clamp structure D.
The vibration test bed A comprises an upper vibration bed 1 and a mounting and fixing base 2;
the multi-shaped clamp pipeline B comprises an engine duplex pipeline 10 and a U-shaped pipeline 11.
As shown in fig. 3, the pipeline supporting system C includes a pipeline supporting base 3, a duplex hoop structure D and positioning pins 6, wherein four threaded holes in a circumferential array are formed in the bottom of the pipeline supporting base 3, and four positioning screws 4 are provided, so that the pipeline supporting base 3 can fix the position of the mounting and fixing base 2 of the vibration test bed.
As shown in fig. 4, the duplex yoke structure D comprises a yoke base 5, a positioning pin 6, a rubber ring 7, an outer ring yoke 8 and a locking bolt 9. Duplex clamp structure D internal diameter shaft collar is equipped with rubber circle 7, plays the effect of fixed protection multiform pipeline, and 5 bottom plate thickness of clamp base is 3mm, sets up the round hole on it, sets up locating pin 6 on the round hole, plays the effect of supporting 3 location of base with the pipeline, and outer lane clamp 8 links to each other through locking bolt 9 with clamp base 5, and locking bolt 9's the degree of screwing up is adaptive to the shaft diameter of multiform pipeline, plays in the multiform pipeline that is applicable to different shaft diameters.
The test sensing system mainly comprises an acceleration sensor and test equipment; the acceleration sensor is installed at a pipeline near the duplex hoop structure D, one acceleration sensor is horizontally installed on each duplex pipeline, the vibration response condition of the engine duplex pipeline 10 in the vertical direction is measured through the acceleration sensor, the measured data is displayed by a matched display controller and is recorded by a signal acquisition card and a signal reading and storing system, the vibration response value of the engine duplex pipeline 10 in the vertical direction is measured, the corresponding frequency of the response value is the resonance frequency of the engine duplex pipeline 10, and each order of the resonance frequency is the inherent frequency of the engine duplex pipeline 10.
The method for measuring the response of the multi-form hoop pipeline is used for measuring the frequency response of the multi-form hoop pipeline and comprises the following steps:
as shown in FIG. 5, load is applied according to given working condition input conditions, four screws in a circumferential array are arranged under a pipeline supporting base through additional load input of a vibration test bed, and further load transmission is achieved to achieve synchronous excitation of the multi-form pipeline of the engine. The multi-shape pipeline is tested through the single pipeline supporting base, the load transmission synchronism is guaranteed, and the measurement error caused by uneven load transmission is avoided; two acceleration sensors which are parallel to each other are added on the pipelines on two sides of the duplex hoop 5, the vibration response of the multi-form hoop pipeline is tested, and the resonance frequency corresponding to the resonance peak value of the vibration response is considered to be the natural frequency of the multi-form hoop pipeline.
The frequency response of the multi-form hoop pipeline under the given working condition is shown as 6, a solid line in the figure is shown as a test measured value, a dotted line in the figure is shown as a fitting value after multiple test measured values, each step of peak value is acceleration response, and the frequency corresponding to the peak value is the inherent frequency of the single-duplex hoop pipeline.
Based on the test method, the invention mainly aims at measuring the frequency response of a single-duplex hoop pipeline in an engine pipeline, and the following explains various working conditions which can be realized by the invention:
the main test condition changes are as follows: (1) the vibration test bed can respectively carry out vibration response tests in the x direction, the y direction and the z direction by changing the pose of the vibration test bed according to working condition input conditions. (2) The testing of multiform pipelines is realized through a single pipeline supporting base, the synchronism of load transmission is ensured, and the measurement error caused by uneven load transmission is avoided. (3) Through the duplex hoop structure, synchronous testing of duplex pipelines and U-shaped pipelines with different shaft diameters can be realized.
The local vibration test bed can comprehensively measure the frequency response in the pipeline of the aircraft engine and obtain an accurate result.

Claims (3)

1.一种多形卡箍管路测试系统振动试验台，其特征在于，由振动试验台A、测试传感系统、管路支撑系统C和双联卡箍结构D；所述的振动试验台A包括振动台(1)和安装固定底座(2)；1. a multi-shaped clamp pipeline testing system vibration test stand, is characterized in that, by vibration test stand A, test sensing system, pipeline support system C and double clamp structure D; Described vibration test stand A includes a vibrating table (1) and a mounting and fixing base (2); 所述的振动试验台A包括振动台(1)和安装固定底座(2)，安装固定底座(2)固定在振动台(1)上方，管路支撑系统C固定在安装固定底座(2)的上方；所述的多形卡箍管路B包括发动机双联管路(10)和U形管路(11)；The vibration test bench A includes a vibration table (1) and an installation and fixed base (2), the installation and fixed base (2) is fixed above the vibration table (1), and the pipeline support system C is fixed on the installation and fixed base (2). Above; the multi-shaped clamp pipeline B includes an engine double pipeline (10) and a U-shaped pipeline (11); 所述的管路支撑系统C包括管路支撑底座(3)、双联卡箍结构D和定位销(6)，其中管路支撑底座(3)底部开设四个呈圆周阵列的螺纹孔，并配有四个定位螺钉(4)，起到管路支撑底座(3)对振动试验台的安装固定底座(2)固定位置的作用；The pipeline support system C includes a pipeline support base (3), a double clamp structure D and a positioning pin (6), wherein the bottom of the pipeline support base (3) is provided with four threaded holes in a circular array, and Equipped with four positioning screws (4), which play the role of fixing the position of the pipeline support base (3) to the mounting and fixing base (2) of the vibration test bench; 所述的双联卡箍结构D由双联卡箍基座(5)、定位销(6)、橡胶圈(7)、外圈卡箍(8)和锁紧螺栓(9)；双联卡箍结构D内径轴圈设有橡胶圈(7)，起到固定保护多形管路的作用，双联卡箍基座(5)上开设圆孔，圆孔上设置定位销(6)，起到和管路支撑底座(3)定位的作用，外圈卡箍(8)与双联卡箍基座(5)通过锁紧螺栓(9)相连；The double clamp structure D is composed of a double clamp base (5), a positioning pin (6), a rubber ring (7), an outer ring clamp (8) and a locking bolt (9); The inner diameter shaft ring of the hoop structure D is provided with a rubber ring (7), which plays the role of fixing and protecting the multi-shaped pipeline. For the purpose of positioning with the pipeline support base (3), the outer ring clamp (8) is connected with the double clamp base (5) through the locking bolt (9); 所述的测试传感系统主要由加速度传感器及测试设备组成；加速度传感器安装在双联卡箍结构D附近的管路处，双联管路上水平各安装一个，通过加速度传感器测得发动机双联管路(10)在竖直方向上振动响应情况，测得的数据由测试设备的显示控制仪显示出来。The test sensing system is mainly composed of acceleration sensor and test equipment; the acceleration sensor is installed at the pipeline near the double clamp structure D, one is installed horizontally on the double pipeline, and the engine double pipe is measured by the acceleration sensor. The road (10) vibrates and responds in the vertical direction, and the measured data is displayed by the display controller of the test equipment. 2.如权利要求1所述的一种多形卡箍管路测试系统振动试验台，其特征在于，所述的双联卡箍基座(5)底板厚度为3mm。2 . The vibration test bench for a multi-shaped clamp pipeline testing system according to claim 1 , wherein the thickness of the bottom plate of the double clamp base ( 5 ) is 3 mm. 3 . 3.采用权利要求1或2所述的一种多形卡箍管路测试系统振动试验台的频率响应测试方法，其特征在于，步骤如下：3. adopt the frequency response test method of a kind of poly-shaped clamp pipeline test system vibration test stand described in claim 1 or 2, it is characterized in that, step is as follows: 步骤一：按照给定工况输入条件来施加载荷，其中分为正弦载荷和随机载荷输入，通过振动试验台附加载荷输入；Step 1: Apply the load according to the input conditions of the given working conditions, which are divided into sinusoidal load and random load input, and input the additional load through the vibration test bench; 步骤二：通过单个管路支撑底座实现对多形管路的测试，保证载荷传递的同步性，避免由于载荷传递不均所造成的测量误差；Step 2: Realize the testing of multi-shaped pipelines through a single pipeline support base to ensure the synchronization of load transmission and avoid measurement errors caused by uneven load transmission; 步骤三：在双联卡箍结构D处两侧管路上附加两个互相平行的加速度传感器，测试该发动机管路的振动响应，该振动响应共振峰值对应的共振频率即为多形卡箍管路的固有频率。Step 3: Attach two parallel acceleration sensors to the pipelines on both sides of the double clamp structure D to test the vibration response of the engine pipeline. The resonance frequency corresponding to the resonance peak value of the vibration response is the multi-shaped clamp pipeline. the natural frequency.
CN202011346988.9A 2020-07-06 2020-11-26 Vibration test bed of multiform clamp pipe test system and frequency response test method thereof Pending CN112525461A (en)

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CN115219129A (en) * 2022-05-31 2022-10-21 上海航天精密机械研究所 Space special-shaped pipeline test system and test method

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CN115219129A (en) * 2022-05-31 2022-10-21 上海航天精密机械研究所 Space special-shaped pipeline test system and test method

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Application publication date: 20210319