阅读说明：本技术 一种大尺寸高量程钢筋混凝土台面测力装置、系统及方法 (Large-size high-range reinforced concrete table force measuring device, system and method ) 是由 惠旭龙 刘小川 白春玉 舒挽 郭军 张宇 牟让科 于 2020-04-30 设计创作，主要内容包括：本发明属于结构动态冲击力学性能实验技术领域,涉及一种大尺寸高量程钢筋混凝土台面测力装置、系统及方法。该装置包括：从上到下依次固连的钢筋混凝土台面、过渡框架、多个单向力传感器、底座框架、地面固定安装板；过渡框架与单向力传感器的上安装面接触；底座框架与单向力传感器的下安装面接触；安装板固定在实验区域地基上。(The invention belongs to the technical field of structural dynamic impact mechanical property experiments, and relates to a large-size high-range reinforced concrete table-board force measuring device, system and method. The device includes: the reinforced concrete platform surface, the transition frame, the plurality of one-way force sensors, the base frame and the ground fixing and mounting plate are fixedly connected in sequence from top to bottom; the transition frame is contacted with the upper mounting surface of the unidirectional force sensor; the base frame is contacted with the lower mounting surface of the unidirectional force sensor; the mounting panel is fixed on experimental area ground.)

1. A force measuring device for a large-size high-range reinforced concrete table top is characterized by comprising: the reinforced concrete platform surface, the transition frame, the plurality of one-way force sensors, the base frame and the ground fixing and mounting plate are fixedly connected in sequence from top to bottom;

the transition frame is contacted with the upper mounting surface of the unidirectional force sensor; the base frame is contacted with the lower mounting surface of the unidirectional force sensor; the mounting panel is fixed on experimental area ground.

2. The device of claim 1, wherein the flatness of the connecting surface and the parallelism of the upper and lower mounting surfaces control the uniform distribution of stress on the unidirectional force sensors, wherein the flatness of the lower surface of the reinforced concrete table is not more than 0.1, the parallelism of the upper and lower surfaces of the transition frame is not more than 0.1, the installation verticality of the unidirectional force sensors is not more than 0.1, and the parallelism of the upper and lower surfaces of the base frame is not more than 0.1.

3. The apparatus of claim 2, wherein the reinforced concrete countertop comprises a steel frame and reinforced concrete; the steel frame plays a prefabricated role, and the reinforced concrete table top is integrally formed; the design parameters of the reinforced concrete refer to relevant standards for the construction of airfield runways.

4. The device of claim 3, wherein the lattice-shaped support and the plurality of support plates; wherein;

the supporting plates are fixed at the two top ends of the rods extending out of the grid in the grid-shaped support and are connected with the reinforced concrete table top through bolts, so that the outward extending part of the reinforced concrete table top is supported.

5. The device of claim 4, wherein the unidirectional force sensors are mounted at desired selected ones of the cross and T staggered positions and four corners of the grid support.

6. The apparatus of any of claims 1-5, further comprising: and the lifting lug is arranged on the upper surface of the reinforced concrete table top.

7. A large-size high-range reinforced concrete table force measuring system is characterized by comprising:

the large-size, high-gauge, reinforced concrete countertop force measuring device, data acquisition system, and control system of any of claims 1-6;

the control system controls the acquisition system to acquire the sensing data of the one-way force sensor in the large-size high-range reinforced concrete table force measuring device.

8. A method for measuring the force of a large-size high-range reinforced concrete table top is characterized by comprising the following steps:

simulating the mechanical environment of the ground of the runway of the airport by using a special large-size reinforced concrete table board, and testing a vertical impact force response signal by using a multi-channel densely-distributed parallel unidirectional force sensor;

the reliable measurement of the vertical impact force is realized through the arrangement of the different measuring ranges of the one-way force sensor.

Technical Field

The invention belongs to the technical field of structural dynamic impact mechanical property experiments, and relates to a large-size high-range reinforced concrete table-board force measuring device, system and method.

Background

The emergency crash accident can inevitably occur in the operation of the airplane due to weather, human, mechanical faults and the like. In the process of airplane research and development, a fuselage structure and internal key equipment need to be subjected to anti-falling collision tests through an experimental method so as to verify the collision resistance of the airplane. Relevant large-scale force measuring equipment is built in research institutions such as FAA, NASA, DLR, Wichina State university and the like abroad, and the drop-and-impact experiment of a fuselage structure and internal key equipment can be carried out in the real runway paper surface environment.

The invention also has a plurality of inventions in the research of force measuring devices in China, and a plurality of patent technologies are provided, such as: the device comprises a flat plate type six-component force measuring platform device (Chinese patent: CN103267602B), an over-constrained wide-range parallel six-dimensional force measuring platform (Chinese patent: CN101703393A) and a piezoelectric type four-dimensional cutting force measuring platform (Chinese patent: CN 101524818A). However, these force measuring devices and systems are all metal table tops, which cannot simulate the ground mechanics property of the airport runway, and the table tops have small size and low effective range, and cannot meet the impact experiment requirements of full-size large-scale airframe frame section structures and airborne equipment. A large-size high-range reinforced concrete force measurement test device and a large-size high-range reinforced concrete force measurement test system need to be designed, and the problem of experiment requirements is solved.

Disclosure of Invention

The invention can meet the requirements of the large-size airframe structure and the airborne equipment crash impact force test under the ground environment of the real airport runway.

The invention provides a force measuring device for a large-size high-range reinforced concrete table top, which comprises: the reinforced concrete platform surface, the transition frame, the plurality of one-way force sensors, the base frame and the ground fixing and mounting plate are fixedly connected in sequence from top to bottom;

the transition frame is contacted with the upper mounting surface of the unidirectional force sensor; the base frame is contacted with the lower mounting surface of the unidirectional force sensor; the mounting panel is fixed on experimental area ground.

The flatness of the connecting surface and the parallelism of the upper and lower mounting surfaces control the uniform distribution stress of the unidirectional force sensors, wherein the flatness of the lower surface of the reinforced concrete table surface is not more than 0.1, the parallelism of the upper and lower surfaces of the transition frame is not more than 0.1, the mounting verticality of the unidirectional force sensors is not more than 0.1, and the parallelism of the upper and lower surfaces of the base frame is not more than 0.1.

The reinforced concrete table top comprises a steel frame and reinforced concrete; the steel frame plays a prefabricated role, and the reinforced concrete table top is integrally formed; the design parameters of the reinforced concrete refer to relevant standards for the construction of airfield runways.

A lattice-shaped support and a plurality of support plates; wherein;

the supporting plates are fixed at the two top ends of the rods extending out of the grid in the grid-shaped support and are connected with the reinforced concrete table top through bolts, so that the outward extending part of the reinforced concrete table top is supported.

The unidirectional force sensors are arranged at the cross staggered position, the T-shaped staggered position and the position selected according to requirements in the four corners of the grid-shaped support.

Further comprising: and the lifting lug is arranged on the upper surface of the reinforced concrete table top.

The invention provides a force measuring system for a large-size high-range reinforced concrete table top, which comprises:

the large-size high-range reinforced concrete table-board force measuring device comprises a large-size high-range reinforced concrete table-board force measuring device, a data acquisition system and a control system;

the control system controls the acquisition system to acquire the sensing data of the one-way force sensor in the large-size high-range reinforced concrete table force measuring device.

The invention provides a method for measuring the force of a large-size high-range reinforced concrete table top, which comprises the following steps:

simulating the mechanical environment of the ground of the runway of the airport by using a special large-size reinforced concrete table board, and testing a vertical impact force response signal by using a multi-channel densely-distributed parallel unidirectional force sensor;

the reliable measurement of the vertical impact force is realized through the arrangement of the different measuring ranges of the one-way force sensor.

The invention has the advantages that:

the invention fully utilizes the stress characteristic of the densely distributed parallel unidirectional spoke type force sensor, combines the bearing/load transmission advantages of the large-size steel frame and the design characteristic of the airport runway, provides the large-size high-range reinforced concrete table force measuring device, the system and the experimental method which meet the requirement of the test of the falling impact force of the airplane body structure and the airborne equipment under the ground environment of the real airport runway, and the experimental device has high reliability and strong operability, can obviously improve the test capability of the airplane falling impact test and the ground impact environment simulation capability, and has wide application prospect.

Drawings

FIG. 1 is a schematic view of a large size high range reinforced concrete countertop force measurement system.

Fig. 2 is a schematic view of a reinforced concrete countertop.

Fig. 3 is a schematic view of a transition frame.

FIG. 4 is a schematic view of the installation of the unidirectional force sensor and the base frame.

Detailed Description

Based on the loading characteristics of the airplane structure crash experiment, a dedicated crash experiment force response test method suitable for a full-size large-scale fuselage frame section structure and airborne equipment under a real runway ground environment is designed. The experimental method mainly utilizes a special large-size reinforced concrete table top to simulate the mechanical environment of the ground of the airport runway, vertical impact force response signals are tested through 10 channels of densely distributed parallel unidirectional spoke type force sensors, the reliable measurement of the vertical impact force is realized through the different range arrangement of the force sensors, and the condition that each force sensor does not exceed the range is ensured. And finally, testing the response of the falling force of the test piece.

As shown in FIG. 1, the force measuring system for the large-size high-range reinforced concrete table top meeting the requirements of the experimental method comprises: the experimental part comprises an experimental part I, a lifting lug II, a reinforced concrete table top III, a transition frame IV, a one-way force sensor IV, a base frame IV, a ground fixing and mounting plate IV, a data acquisition system IV and a control system IV. The reinforced concrete table top is connected with the transition frame through bolts to realize fixed support. The transition frame is connected with the base frame through the upper and lower mounting surfaces of the unidirectional force sensor. The uniform distribution stress of 10 unidirectional force sensors is realized by controlling the planeness of the connecting surface and the parallelism of the upper and lower mounting surfaces, wherein the planeness of the lower surface of the reinforced concrete table surface is not more than 0.1, the parallelism of the upper and lower surfaces of the transition frame is not more than 0.1, the installation verticality of the unidirectional force sensors is not more than 0.1, and the parallelism of the upper and lower surfaces of the base frame is not more than 0.1. The ground fixing and mounting plate is fixed on the foundation of the experimental area through foundation bolts, and the fixing support of the whole force measuring platform device is realized.

As shown in figure 2, the reinforced concrete table top comprises two parts, namely a steel frame A1 and reinforced concrete A2, the steel frame has a prefabrication effect, the integral forming of the table top is realized, the design parameters of the reinforced concrete refer to the relevant standards of the construction of airfield runways, the strength grade is not lower than C30, and the overall size of the table top is 4m multiplied by 6 m. As shown in FIG. 3, six supporting plates B1-B6 are designed on two sides of the transition frame and connected with the reinforced concrete table top through bolts, so that the overhanging part of the reinforced concrete table top is supported, and the first-order natural frequency of the force measuring device system can be effectively increased to 120 Hz. As shown in FIG. 4, the unidirectional force sensor is connected with the transition frame through an upper mounting surface D1 and is connected with the base frame through a lower mounting surface D2, and after the sensor is mounted, the parallelism between the lower surface of the transition frame and the upper surface of the base frame is not more than 0.1. The force measuring device is totally provided with 10 one-way force sensors (C1-C10), and the total measuring range is 240 tons. Wherein the measuring ranges of C5 and C6 are 60 tons, the measuring ranges of C1, C3, C4, C7, C8 and C10 are 10 tons, and the measuring ranges of C2 and C9 are 30 tons.

After the experimental part vertically impacts the reinforced concrete table top of the force measuring platform at a certain speed, the impact force is transmitted to the transition frame through the reinforced concrete table top and then transmitted to the 10 one-way force sensors through the transition frame, and force response signals of the one-way force sensors are transmitted to a control system computer through the data acquisition system, so that the measurement and the acquisition of the falling force response signals of the experimental part are realized.

The invention provides a force measuring device, a force measuring system and a force measuring method for a large-size high-range reinforced concrete table board.