CN111579237A - Free boundary simulation system for modal test - Google Patents
Free boundary simulation system for modal test Download PDFInfo
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- CN111579237A CN111579237A CN202010579129.8A CN202010579129A CN111579237A CN 111579237 A CN111579237 A CN 111579237A CN 202010579129 A CN202010579129 A CN 202010579129A CN 111579237 A CN111579237 A CN 111579237A
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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
- G01M13/00—Testing of machine parts
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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
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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Abstract
A free boundary simulation system for a modal test comprises N limiting mechanisms and air bags, wherein the N limiting mechanisms are placed on the ground; the limiting mechanism and the air bag are arranged at the product bearing structure, a tested product is placed on the limiting mechanism when the limiting mechanism does not work, and the air bag is inflated to lift and float the product when the limiting mechanism works and keep stable at a certain height; the upper part of the air bag is fixedly provided with a switching tool, when the air bag does not work, a tested product is placed on the limiting mechanism through the switching tool, and the switching tool is matched with the shape of a contact surface of the tested product; when the system does not work, the tested product is placed on the limiting mechanism through the switching tool; when the system works, the product can be lifted and floated by inflating the air bag and can be kept stable at a certain height, and the free boundary simulation of the tested product is realized, so that the modal test can be carried out.
Description
Technical Field
The invention belongs to the field of modal tests, and particularly relates to a free boundary simulation system which can meet boundary requirements of modal tests.
Background
Usually, in order to obtain dynamic characteristic parameters of the product, such as frequency, vibration mode, damping, vibration mode slope and the like, a modal test is performed on the product. The normal working environment of the tested product should be reproduced as much as possible, and a considerable part of the normal working environment of the product is in a completely free boundary condition, such as an aircraft in a flying state, and therefore, the free boundary condition needs to be simulated on the ground, so that the development of the modal test is facilitated. Generally, the rigid body motion frequency of the boundary support system is lower than 1/5 to l/6 of the fundamental frequency of the elasticity of the product, namely, the support requirement of the free boundary is met, and the result of the modal test is not adversely affected.
The modal test of large products (such as carrier rockets) is usually carried out in a vibration tower, a boundary simulation system of the modal test is mainly based on spring-steel rope flexible suspension, the cost performance of the modal test is lower in the vibration tower for small and medium products, the self weight of matched suspension equipment for the large products is usually larger, larger additional mass can be brought to the products, the modal test result is influenced, and meanwhile, the requirement on a test site is usually higher when the suspension system is temporarily built, and certain potential safety hazards are brought.
Disclosure of Invention
Technical problem to be solved
A series of air bags are utilized to stably lift a product, the requirement of vertical supporting frequency is met, and an efficient and reliable free boundary simulation system building method is provided.
(II) technical scheme
The invention relates to a free boundary simulation system for a modal test, which comprises N limiting mechanisms and air bags, wherein the N limiting mechanisms are placed on the ground; the limiting mechanism and the air bag are arranged at the product bearing structure, a tested product is placed on the limiting mechanism when the limiting mechanism does not work, and the air bag is inflated to lift and float the product when the limiting mechanism works and is kept stable at a certain height.
Further, the switching tool is fixed on the upper portion of the air bag, when the switching tool does not work, a tested product is placed on the limiting mechanism through the switching tool, and the switching tool is matched with the shape of a contact surface of the tested product.
Further, the lower surface of the switching tool is fixed with a frustum structure, the limiting mechanism is of a hollow structure, the switching tool is inserted into the limiting mechanism, the frustum structure is matched with the hollow limiting mechanism, the position of a tested product is unchanged when the tested product falls down, and after the tested product floats, the limiting mechanism realizes two free limiting of rolling and pitching of the tested product and lower limiting of vertical movement.
Further, the air supply system includes the gas circuit control platform, and the gas circuit control platform includes that the air supply main road is gaseous entry, is connected with outside air supply to and the export of a plurality of air feed branch roads, every gasbag and solitary air feed branch road connection, and each air feed branch road sets up proportional control valve and bleeder valve.
Further, the device also comprises a control system, wherein the control system comprises a boundary simulation controller, a pressure sensor and a displacement sensor; the boundary simulation controller is connected with the air circuit console, the pressure sensor and the displacement sensor through cables, the displacement sensor is arranged near the air bag, and the pressure sensor is arranged on the air bag.
Further, the proportional control valve and the relief valve are connected with a boundary simulation controller.
And further, the air bag type air bag further comprises an additional air chamber, the additional air chamber is arranged between the air supply branch and the air bag, a proportional control valve and a relief valve are arranged on the air supply branch, and a pressure sensor is arranged in the additional air chamber.
The working process is as follows: before work, a tested product is placed on the limiting mechanism through the switching tool, the air source is started to supply air, the boundary simulation controller is started, and the tested product is floated; when the floating height of the tested product meets the requirements of the modal test, starting the filtering function of the boundary simulation controller; the free boundary simulation of the tested product is completed, and a modal test can be carried out.
(III) advantageous technical effects
Aiming at the modal test working condition of small and medium-sized products, a simple and feasible free boundary simulation scheme is provided; the system has high flexibility and good adaptability, and can freely match the specification, the quantity and the layout of the air bags and adopt additional air chambers according to the product state and the test conditions; the system has strong expansion capability, the control system matched with the system can be matched with a plurality of gas circuit control consoles, and a single gas circuit control console can be matched with a plurality of air bags, thereby being convenient for dealing with large-scale tests.
Drawings
FIG. 1: free boundary simulation system structure diagram for modal test
The test method comprises the following steps of 1-tested products, 2-switching tools, 3-air bags, 4-displacement sensors, 5-limiting mechanisms, 6-pressure sensors, 7-additional air chambers, 8-air path control tables, 9-main path interfaces, 10-boundary simulation controllers and 11-frustum structures.
Detailed Description
In addition to the embodiments described below, the invention is capable of other embodiments or of being practiced or carried out in various ways. It is to be understood, therefore, that the invention is not limited in its application to the details of construction and the arrangements of the components set forth in the following description or illustrated in the drawings. While only one embodiment has been described herein, the claims are not to be limited to that embodiment.
As shown in fig. 1, the free boundary simulation system for the modal test of the present invention includes a tested product 1, a transfer tool 2, an air bag 3, a displacement sensor 4, a limiting mechanism 5, a pressure sensor 6, an additional air chamber 7, an air path console 8, a main path interface 9, a boundary simulation controller 10, and a frustum structure 11.
Stop gear 5 symmetrical arrangement is twice in gasbag 3, and stop gear 5, gasbag 3 arrange in product bearing structure department below, and the out-of-work time is parked on stop gear 5 by trial product 1 through switching frock 2, and the during operation is aerifyd in 3 gasbags and is lifted the product and float to keep stable at a take the altitude.
The switching tool 2 is installed on the upper portion of the air bag 3, the tested product 1 is placed on the limiting mechanism 5 through the switching tool 2, the switching tool 2 is matched with the appearance of the tested product 1, and the switching tool 2 is fixedly connected with the tested product 1 and the upper portion of the air bag 2.
Stop gear 5 is hollow structure, and the lower surface of switching frock 2 links firmly frustum structure 11, and frustum structure 11 inserts in stop gear 5. The limiting mechanism 5 can realize long-term parking of the tested product 1, the frustum structure 11 is matched with the hollow limiting mechanism 5, the position of the tested product 1 can be guaranteed to be unchanged when the tested product 1 falls down again, and the limiting mechanism 5 can realize two free limits of rolling and pitching of the tested product 1 and lower limit of vertical movement after the tested product 1 floats.
The air supply system comprises an air circuit control table 8, the air circuit control table 8 comprises an air supply main path 9, an inlet for air, an outlet for connecting with an external air source and a plurality of air supply branches, each air bag is connected with an independent air supply branch, and each air supply branch is provided with a proportional control valve and a relief valve.
The control system comprises a boundary simulation controller 10, a pressure sensor 6 and a displacement sensor 4; the boundary simulation controller 10 is connected with the air path console 8, the pressure sensor 6 and the displacement sensor 4 through cables, the displacement sensor 4 is arranged near the air bag, and the pressure sensor 6 is arranged on the air supply branch; the boundary simulation controller 10 is used for real-time closed-loop resolving and whole-process monitoring; wherein, the pressure sensor 6 is arranged on the air supply branch or the additional air chamber 7 and is used for measuring the air supply pressure; and an additional air chamber 7, wherein a proportional control valve and a relief valve are arranged in the air supply branch between the air supply branch and the air bag.
According to the test requirement, an additional air chamber 7 can be connected between the air supply branch and the air bag 3; by applying the system of the invention, the supporting frequency of the boundary simulation system can meet the requirements of modal tests by reasonably selecting the specification and the number of the air bags and adopting the additional air chambers if necessary.
After the product floats, the closed-loop control can not correct the product displacement fluctuation caused by the modal test through reasonably designing control parameters, so that the result of the modal test is not interfered.
The air circuit control console 8 in the system can be matched with a plurality of air bags 3, and the boundary simulation controller 10 in the system can be matched with a plurality of air circuit control consoles 8.
Before the system is built, the number and the distribution of the air bags 3 are designed according to the mass distribution and the bearing distribution of the tested product 1, the pressure grade of the air bags 3 is selected according to the modal fundamental frequency of the tested product 1, the additional air chamber 6 is determined to be adopted, and the switching tool 2 is designed according to the physical interface of the air bags 3 and the tested product 1.
Before the test, the air bag 3, the transfer tool 2 and the limiting mechanism 5 are placed on the ground of a factory building, the distance meets the bearing distribution of tested products, the tested products 1 are placed on the transfer tool 2 through hoisting, the air bag 3 does not bear the weight at the moment, and all the weight is borne by the limiting mechanism 5.
The displacement sensor 4 is arranged in the vicinity of the airbag 3 and the pressure sensor 6 is arranged on the additional air chamber 7.
And connecting an air source with a main channel interface 9 of the air channel console 8.
The pipeline communicated between the air passage control console 8 and the additional air chamber 7 is communicated with the pipeline communicated between the additional air chamber 7 and the air bag 3.
And a signal cable between the boundary simulation controller 10 and the displacement sensor 4 and the pressure sensor 6 is connected, and a signal cable between the boundary simulation controller 10 and the air channel console 8 is connected.
When the device works, the air source is started to supply air, the boundary simulation controller 10 is started, and the tested product 1 is floated; when the floating height of the product 1 to be tested meets the requirements of the modal test, starting the filtering function of the boundary simulation controller 10; the simulation of the free boundary of the tested product 1 is completed, and a modal test can be carried out.
While the embodiments of the present invention have been described in detail, the above embodiments are merely exemplary of the present invention, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. A free boundary simulation system for a modal test is characterized by comprising N limiting mechanisms and air bags, wherein the N limiting mechanisms are placed on the ground; the limiting mechanism and the air bag are arranged at the product bearing structure, a tested product is placed on the limiting mechanism when the limiting mechanism does not work, and the air bag is inflated to lift and float the product when the limiting mechanism works and is kept stable at a certain height.
2. The free boundary simulation system for modal testing of claim 1, wherein the switching tool is fixed at the upper part of the airbag, and when the switching tool does not work, a tested product is placed on the limiting mechanism through the switching tool, and the switching tool is matched with the shape of the contact surface of the tested product.
3. The free boundary simulation system for modal testing of claim 1, wherein the lower surface of the adapting tool is fixed with a frustum structure, the limiting mechanism is a hollow structure, the adapting tool is inserted into the limiting mechanism, the frustum structure is matched with the hollow limiting mechanism, the position of the tested product is unchanged when the tested product falls down, and after the tested product floats, the limiting mechanism realizes two free limits of rolling and pitching of the tested product and lower limit of vertical movement.
4. The free boundary simulation system for modal testing of claim 1, wherein the gas supply system comprises a gas circuit console, the gas circuit console comprising an inlet for gas for the gas supply main, connected to an external gas source, and an outlet for a plurality of gas supply branches, each airbag being connected to a separate gas supply branch, each gas supply branch being provided with a proportional control valve and a bleed valve.
5. The free boundary simulation system for modal testing of claim 3 further comprising a control system comprising a boundary simulation controller, a pressure sensor, a displacement sensor; the boundary simulation controller is connected with the air circuit console, the pressure sensor and the displacement sensor through cables, the displacement sensor is arranged near the air bag, and the pressure sensor is arranged on the air bag.
6. The free boundary simulation system for modal testing of claim 5 wherein the proportional control valve and the bleed valve are connected to a boundary simulation controller.
7. The free boundary simulation system for modal testing of any of claims 1 to 6 further comprising an additional air chamber between the air supply branch and the air bladder, the air supply branch being provided with a proportional control valve and a relief valve, the additional air chamber being provided with a pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010579129.8A CN111579237A (en) | 2020-06-23 | 2020-06-23 | Free boundary simulation system for modal test |
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| CN202010579129.8A CN111579237A (en) | 2020-06-23 | 2020-06-23 | Free boundary simulation system for modal test |
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| CN111579237A true CN111579237A (en) | 2020-08-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111947901A (en) * | 2020-09-23 | 2020-11-17 | 北京强度环境研究所 | Novel spring steel cable free boundary simulation system |
| CN112340056A (en) * | 2020-09-22 | 2021-02-09 | 北京强度环境研究所 | Free boundary simulation support module |
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Cited By (3)
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| CN112340056A (en) * | 2020-09-22 | 2021-02-09 | 北京强度环境研究所 | Free boundary simulation support module |
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Application publication date: 20200825 |
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