Railway sound barrier fatigue testing machine and use method

Abstract

The invention discloses a railway sound barrier fatigue testing machine. The fatigue testing machine comprises an actuator; each bearing device comprises a load sensor for collecting fatigue load, a steel stand column connected with the sensor, and a bearing frame connected with the sensor and the steel stand column; the load transmission device comprises a steel tank and an air bag which can be mutually contacted or fixedly connected, and horizontal bubbles are arranged on the upper surface of the side wall of the steel tank; and the actuator is connected with the steel tank. The invention further discloses a using method of the testing machine. The railway sound barrier fatigue testing machine can accurately measure the fatigue load or the corresponding wind pressure borne by a sound barrier sample, and the fatigue load or the corresponding wind pressure can be used as a feedback signal to guide the testing machine to load the load, so that the problem of inaccurate measurement of the load borne by the tested sample caused by tool inertia is avoided. The testing machine can also uniformly distribute loads on the stress surface of the sound barrier, and can be suitable for the concave-convex design condition of the sound barrier panel, so that the application range of the testing machine is expanded.

Description

Technical Field

[0001] The invention relates to a mechanical performance evaluation device for a sound barrier component, and in particular to a railway sound barrier fatigue testing machine and a use method thereof. Background Art

[0002] At present, the fatigue test of railway sound barriers is a type of mechanical property test in which the sound barrier is placed between two fixed steel sections and a compressive fatigue load is applied to the panels on both sides of the sound barrier to cause concave deformation of the sound barrier panels.

[0003] Commonly used fatigue testing machines are equipped with a load sensor at the end of the actuator to measure the load output by the actuator, and use this as a feedback signal to adjust the load of the testing machine. When the actuator is in direct contact with the sample under test, the load output by the actuator is basically the same as the load on the sample under test. When the fatigue load is loaded in the same direction (such as compression fatigue or tension fatigue), the load output by the actuator is basically the same as the load on the sample under test. When a heavier tooling is used to connect the actuator and the sample under test, the fatigue load is loaded in different directions (tension and compression fatigue), and the loading frequency is high, due to the inertia of the heavier tooling, the load tested by the load sensor installed at the end of the actuator is the actual load on the sample under test and the inertia force of the tooling, not the actual load on the sample under test.

[0004] Existing sound barrier fatigue testing machines such as Fig. 9 and Fig.10 As shown, it uses a traditional electro-hydraulic servo fatigue testing machine with a loading frame for fatigue testing. The load sensor 8 connected to the actuator 1 is used as a feedback signal to adjust the fatigue loading load. The sound barrier slot 15 simulates two H-shaped steels for fixing the sound barrier. The loading frame is composed of a pressure plate 12, a force plate 13, a fixed screw, etc. The force plate 13 (generally made of steel plate) is in direct contact with the sound barrier, and there is a distance between the force plates 13. The loading method used is that the actuator 2 pushes the pressure plate 12 so that the force plate 13 is in direct contact with the sound barrier and is loaded. The fatigue loading load is adjusted by the load sensor 8 connected to the actuator 2 as a feedback signal.

[0005] During the loading process of the existing test machine, the sound barrier panel is sunken after being loaded, and only the two edges of the force plate are in contact with the sound barrier, resulting in the main contact load being concentrated at the two edges, which cannot simulate the uniform loading process of wind pressure. In addition, the load received by the load sensor is the sum of the inertial force of the loading frame and the load acting on the sound barrier, and cannot accurately measure the actual fatigue load on the sound barrier. Summary of the invention

[0006] In order to overcome the problems of poor accuracy and system error of the above-mentioned sound barrier fatigue testing machine, the present invention provides a railway sound barrier fatigue testing machine. The fatigue testing machine can simulate the uniform loading process of wind pressure, so as to accurately measure the actual fatigue load of the sound barrier.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0008] A railway sound barrier fatigue testing machine, comprising the following structure:

[0009] Actuator;

[0010] Multiple load-bearing devices, each of which includes a load sensor for collecting fatigue load, a steel column connected to the sensor, and a load-bearing frame connected to both the sensor and the steel column; during the experiment, the sound barrier sample is placed on the load-bearing frame.

[0011] The load transfer device comprises a steel trough and an air bag which can contact or be connected and fixed to each other, and a horizontal bubble is provided on the upper surface of the side wall of the steel trough;

[0012] The actuator is connected to the steel trough.

[0013] Furthermore, a barometer is installed in the airbag.

[0014] Furthermore, the steel column is H-shaped.

[0015] Furthermore, the actuator is connected to an actuator reaction frame for balancing fatigue load.

[0016] Furthermore, the railway sound barrier fatigue testing machine is also provided with an assembly screw connecting the steel trough and the airbag as a whole.

[0017] Furthermore, the assembly screw is equipped with an assembly nut capable of adjusting the spacing between the steel grooves.

[0018] Further, the plurality is four. For balance considerations, the number of the carrying devices is generally more than three, preferably four.

[0019] Furthermore, the support frame is provided with a support frame side wall having a blocking function.

[0020] A load sensor is installed behind the load frame of this testing machine. Since the load frame is in direct contact with the sound barrier sample, the load frame, load sensor and steel column are tightly connected. The load sensor can accurately measure the actual fatigue load on the sound barrier during the fatigue process and is not affected by the inertia force of the tooling.

[0021] The airbag used to transmit the load in this testing machine contains a barometer, which can accurately measure the change of air pressure in the airbag. Since the air inside the airbag flows freely, the air pressure inside the airbag can be regarded as consistent. When the airbag is compressed and the volume decreases, the internal air pressure gradually increases. The internal air pressure is the pressure on the contact surface of the airbag. The load sensor can accurately measure the actual pressure (i.e. fatigue load) on the sound barrier during the fatigue process, and is not affected by the inertia force of the tooling.

[0022] The average load value detected by the two sensors on the side of the force can be used as the feedback signal of the fatigue test machine loading, avoiding the problem of inaccurate load measurement of the tested sample caused by the inertia of the tooling. Similarly, the air pressure gauge in the airbag can also be used as the feedback signal of the fatigue test machine loading, avoiding the problem of inaccurate load measurement of the tested sample caused by the inertia of the tooling.

[0023] The basic functions of each component of the present invention are as follows:

[0024] (1) Actuator reaction frame: connected to the actuator and used to balance the fatigue load applied by the actuator to the sound barrier.

[0025] (2) Actuator: used to apply fatigue test loads and simulate train pulsating wind pressure.

[0026] (3) Steel trough: transfers loads and connects the actuator and the airbag. The steel trough is surrounded by steel trough side walls, and the airbag is installed in the steel trough side walls. The upper surface of the steel trough side walls has horizontal bubbles to adjust the horizontality of the steel trough. The back of the steel trough has assembly holes for assembly with bolts and nuts. The back has a reserved hole for the barometer wire for the barometer wire to pass through.

[0027] (4) Airbag: transfers loads, one side is connected to the steel trough, and the other side contacts the sound barrier to transfer fatigue loads. The contact surface between the airbag and the steel trough is attached with Velcro to facilitate the fixation of the airbag and the steel trough. The airbag is equipped with a barometer to test the internal pressure of the airbag.

[0028] Analysis of airbag loading process:

[0029] ① The actuator is pushed out, and the airbag in the relaxed state in the steel groove on one side contacts the sound barrier. The contact area between the two parts gradually increases until the exposed part of the force-bearing surface of the sound barrier is completely in contact with the airbag. Since the airbag is in a relaxed state, the air pressure inside the airbag is still consistent with the external air pressure. At this time, the sound barrier can be regarded as not subjected to compressive load and only has the contact load between the airbag and the sound barrier (which can be ignored).

[0030] ② As the actuator continues to be pushed out, the volume of the airbag decreases and the pressure inside the airbag gradually increases. Since the airbag is in complete contact with the force-bearing surface of the sound barrier, the force-bearing surface of the sound barrier in contact with the airbag begins to be subjected to a uniform compressive load.

[0031] ③ As the actuator continues to push out, the volume of the airbag further decreases, the pressure inside the airbag increases, and the sound barrier panel in contact with the airbag begins to have a larger depression in the middle and a smaller depression around the edges. Due to the fluidity of the air, the air pressure at all positions inside the airbag is consistent, resulting in the deformation of the airbag being consistent with the deformation of the sound barrier, and the airbag in contact with the sound barrier has a larger bulge in the middle and a smaller bulge around the edges. At this time, the force-bearing surface of the sound barrier in contact with the airbag is still subject to a uniformly distributed load. The sound barrier should be subjected to the load required by the fatigue program until it reaches the pressure. The pressure displayed by the barometer inside the airbag is the corresponding wind pressure on the sound barrier. Due to the feedback from the load sensor or barometer, the actuator stops pushing out at this time.

[0032] ④ The actuator contracts, the volume of the airbag increases, the pressure inside the airbag decreases, and the sound barrier panel in contact with the airbag gradually returns to a flat state. In this process, since the deformation of the airbag and the sound barrier is consistent, the force-bearing surface of the sound barrier in contact with the airbag is still subject to a uniform load.

[0033] ⑤ As the actuator continues to contract, the airbag loses contact with the sound barrier panel. At this time, the airbag on the other side and the panel on the other side of the sound barrier repeat steps ①-④ to complete a fatigue loading cycle.

[0034] (5) Assembling screws: Assemble the two steel grooves and the two air bags into a whole.

[0035] (6) Assembling nuts: Adjust the distance between the two steel grooves so that the airbags on both sides are in contact with the surface of the sound barrier before the fatigue test and no pressure is generated.

[0036] (7) H-shaped steel column: connected to the load sensor to balance the fatigue load on the sound barrier sample. The bottom of the H-shaped steel column has an H-shaped steel column positioning hole, which is used to adjust the spacing between the bearing frames to the specified distance of the test.

[0037] (8) Load sensor: collects the fatigue load acting on the sound barrier.

[0038] (9) Loading frame: connected to the H-shaped steel column and the load sensor. The sound barrier sample is placed on the loading frame. The side wall of the loading frame is used to prevent the sound barrier sample from sliding laterally during fatigue and acts as a barrier. Bolts are used to pass through the connection step holes to tightly connect the loading frame, load sensor and H-shaped steel column.

[0039] (10) Sound barrier sample: a plate-type acoustic component module with sound absorption and insulation performance, which withstands fatigue load during fatigue test.

[0040] The present invention also provides a method for using the aforementioned railway sound barrier fatigue testing machine, comprising the following steps in sequence:

[0041] 1. Assemble the load-bearing device;

[0042] 2. Inflate the airbags and adjust the distance between the airbags so that the airbags are in contact with the surface of the sound barrier sample without generating pressure;

[0043] 3. The actuator applies fatigue load.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. The fatigue load or corresponding wind pressure on the sound barrier sample can be accurately measured, and this can be used as a feedback signal to guide the test machine to load the load, avoiding the problem of inaccurate load measurement on the tested sample caused by the inertia of the tooling.

[0046] 2. The load can be evenly distributed on the stress-bearing surface of the sound barrier. It can be applied to the situation where the sound barrier panel has concave and convex designs, thus expanding the scope of use of the test machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a structural schematic diagram of the railway sound barrier fatigue testing machine of the present invention.

[0048] Figure 2 It is a side view schematic diagram of the railway sound barrier fatigue testing machine of the present invention.

[0049] Figure 3 This is a schematic diagram of the main view of the steel channel.

[0050] Figure 4 It is a schematic side view of the steel tank with additional airbag.

[0051] Figure 5 It is a partial schematic diagram after the two steel grooves and additional air bags are assembled.

[0052] Figure 6 It is a top view schematic diagram of the H-shaped steel column, load sensor and load-bearing frame after assembly.

[0053] Figure 7 It is a schematic diagram of the main view after the H-shaped steel column, load sensor and bearing frame are assembled.

[0054] Figure 8 This is a top view of the H-shaped steel column, load sensor, load frame and sound barrier sample after assembly.

[0055] Fig. 9 This is a schematic diagram of an existing sound barrier fatigue testing machine.

[0056] Fig.10 yes Fig. 9 A-A sectional view.

[0057] Description of reference numerals:

[0058] 1—actuator reaction frame; 2—actuator; 3—steel trough; 32—level bubble; 4—air bag; 41—barometer; 5—assembly screw; 6—assembly nut; 7—H-shaped steel column; 8—load sensor; 9—carrying frame; 10—sound barrier sample; 31—steel trough side wall; 32—level bubble; 33—assembly hole; 34—reserved hole for barometer wire; 91—carrying frame side wall; 92—carrying platform; 93—connecting step hole; 12—pressure plate; 13—force plate; 14—fixing bolt; 15—sound barrier slot. DETAILED DESCRIPTION

[0059] Example 1

[0060] like Figures 1 to 8 As shown, the railway sound barrier fatigue testing machine of the present invention comprises the following structure:

[0061] Actuator 2;

[0062] Four load-bearing devices, each of which includes a load sensor 8 for collecting fatigue load, an H-shaped steel column 7 connected to the sensor 8, and a load-bearing frame 9 connected to both the sensor 8 and the H-shaped steel column 7; the aforementioned actuator 2 is connected to the steel trough 3. During the experiment, the sound barrier sample 10 is placed on the load-bearing frame 9;

[0063] The load transfer device includes a steel tank 3 and an air bag 4 which can be in contact with each other or connected and fixed. A horizontal bubble 32 is provided on the upper surface of the steel tank side wall 31. The steel tank 3 is also provided with an assembly hole 33 and a barometer wire reserved hole 34. Figure 1 and Figure 3 As shown. A barometer 41 is installed in the airbag 4. Figure 4 shown.

[0064] like Figure 1 As shown, the aforementioned actuator 2 is connected to an actuator reaction frame 1 for balancing fatigue loads.

[0065] like Figure 8 As shown, there are a total of four groups of bearing devices, including a bearing frame 9, a load sensor 8 and an H-shaped steel column 7. The spacing between the four assemblies is adjusted so that the lateral and longitudinal spacings of the four bearing frames 9 are consistent with the spacing required by the sound barrier samples. The H-shaped steel columns are fixed and the sound barrier samples 10 are placed on the bearing frames 9.

[0066] like Figure 1 As shown, the railway sound barrier fatigue testing machine is also provided with an assembly screw 5 which connects the aforementioned steel groove 3 and the air bag 4 as one body. The assembly screw 5 is provided with an assembly nut 6 which can adjust the distance between the two steel grooves 3.

[0067] like Figure 6 and Figure 7As shown, the aforementioned support frame is provided with a support frame side wall 91 that plays a blocking role. Each support device is provided with a support platform 92 for placing the sound barrier sample 10 and a connecting step hole 93 for installation.

[0068] Example 2

[0069] The method for using the railway sound barrier fatigue testing machine described in Example 1 comprises the following specific steps:

[0070] 1. Use bolts to pass through the connecting step holes 93 to tightly connect the sound barrier support frame 9, load sensor 8 and H-shaped steel column 7. Adjust the spacing between the four H-shaped steel columns so that the horizontal and vertical spacing of the four sound barrier support frames is consistent with the spacing required by the sound barrier sample, and place the sound barrier sample 10 on the support frame 9.

[0071] 2. Fill the airbag 4 with air, observe the state of the barometer 41 and the airbag 4, so that the airbag 4 is not filled, the internal non-pressurized state (consistent with the external air pressure), and the contact surface with the sound barrier sample 10 is in a relaxed state. Install the airbags 4 into the two steel grooves 3 respectively, and use Velcro to fix the airbags 4 to the steel grooves 3. Place the two steel grooves 3 with the airbags 4 fixed on both sides of the sound barrier sample 10 respectively, pass the fastening bolts through the assembly holes, and use the assembly nuts 6 to adjust the distance between the two airbags 4 so that the airbags 4 on both sides are in contact with the surface of the sound barrier sample 10 before the fatigue test, and no pressure is generated. Adjust the direction of the two steel grooves 3 so that the horizontal bubble 32 on the steel groove 3 is centered, and tighten the assembly nuts 6 to assemble the two steel grooves 3 with the airbags 4 fixed into a whole.

[0072] 3. One side of the steel groove 3 is connected to the actuator 2, and the actuator 2 is connected to the actuator reaction frame 1. At this time, the fatigue program of the testing machine is started, the test parameters are set according to the standard, and the test begins.

[0073] The railway sound barrier fatigue testing machine and the method of use involved in the present invention are introduced in detail above. The principles and implementation methods of the present invention are described in detail using specific examples herein. The description of the above embodiments is only used to help understand the scheme of the present invention and its core idea. It should be pointed out that the present invention is not limited to the above exemplary embodiments, and those skilled in the art may make various changes and modifications without departing from the scope or spirit of the present invention. At the same time, for those of ordinary skill in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and scope of application; therefore, in summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A railway sound barrier fatigue testing machine, characterized in that: Includes the following structures: Actuator; A plurality of load-bearing devices, each of which includes a load sensor for collecting fatigue load, a steel column connected to the sensor, and a load-bearing frame connected to the sensor and the steel column; The load transfer device comprises a steel trough and an air bag which can contact or be connected and fixed to each other, and a horizontal bubble is provided on the upper surface of the side wall of the steel trough; The actuator is connected to the steel trough.

2. The railway sound barrier fatigue testing machine according to claim 1, characterized in that: A barometer is installed in the airbag.

3. The railway sound barrier fatigue testing machine according to claim 1, characterized in that: The steel column is H-shaped.

4. The railway sound barrier fatigue testing machine according to claim 1, characterized in that: The actuator is connected to an actuator reaction frame for balancing fatigue load.

5. The railway sound barrier fatigue testing machine according to claim 1, characterized in that: An assembling screw rod is also provided for connecting the steel groove and the air bag as a whole.

6. The railway sound barrier fatigue testing machine according to claim 5, characterized in that: The assembly screw rod is equipped with an assembly nut capable of adjusting the spacing between the steel grooves.

7. The railway sound barrier fatigue testing machine according to claim 1, characterized in that: The plurality is four.

8. The railway sound barrier fatigue testing machine according to claim 1, characterized in that: The bearing frame is provided with a bearing frame side wall which plays a blocking role.

9. The method for using the railway sound barrier fatigue testing machine according to any one of claims 1 to 8, characterized in that: The steps include the following sequence:

1. Assemble the load-bearing device; 2. Inflate the airbags and adjust the distance between the airbags so that the airbags are in contact with the surface of the sound barrier sample without generating pressure; 3. The actuator applies fatigue load.

10. The method for using the railway sound barrier fatigue testing machine according to claim 9, characterized in that: It consists of the following steps:

1. Use bolts to pass through the connecting step holes to tightly connect the sound barrier bearing frame, load sensor and steel columns; adjust the spacing between the steel columns so that the horizontal and vertical spacing of the sound barrier bearing frame is consistent with the spacing required by the sound barrier sample, and place the sound barrier sample on the bearing frame; 2. Fill the airbag with air, observe the barometer and the state of the airbag, so that the airbag is not filled, the inside is not pressurized, and the contact surface with the sound barrier sample is in a relaxed state; install the airbags into two steel grooves respectively, and use Velcro to fix the airbags and the steel grooves. Place the two steel grooves with the airbags fixed on both sides of the sound barrier sample respectively, pass the fastening bolts through the assembly holes, and use the assembly nuts to adjust the distance between the two airbags, so that before the fatigue test, the airbags on both sides are in contact with the surface of the sound barrier sample and no pressure is generated; adjust the direction of the two steel grooves so that the horizontal bubble on the steel groove is centered, and tighten the assembly nuts to assemble the two steel grooves with the airbags fixed into a whole; 3. One side of the steel trough is connected to the actuator, and the actuator is connected to the actuator reaction frame. At this time, start the fatigue program of the testing machine, set the test parameters according to the standard, and start the test.

Images