Dynamic sound insulation test system and method for vehicle door system

Abstract

The invention discloses a dynamic sound insulation test system for a vehicle door system in a vehicle door system. The dynamic sound insulation test system comprises an acoustic detection system and an air pressure difference generation device, the acoustic detection system comprises a sound source chamber and a receiving chamber, and door system test pieces are arranged between the sound source chamber and the receiving chamber at intervals; the air pressure difference generating device is connected with the sound source chamber and the receiving chamber, the air pressure difference generating device achieves synchronous adjustment of the air pressure of the sound source chamber and the air pressure of the receiving chamber, the acoustic detection system has a first state and a second state, and in the first state, the sound source chamber is pressurized, and the receiving chamber is depressurized; in the second state, the pressure in the sound source chamber is reduced, and the pressure in the receiving chamber is increased; the air pressure difference generating device designed in the invention synchronously regulates and controls the air pressure in the sound source chamber and the receiving chamber, realizes the establishment and stable control of the pressure difference inside and outside the vehicle door, can truly simulate the deformation condition of the rubber strip under the pressure difference working condition, is more accurate in test result, is simpler in operation method, and is shorter in time consumption.

Description

Technical Field

[0001] The present application relates to the technical field of rail transit vehicle door systems, and in particular to a dynamic sound insulation testing system and method for a vehicle door system. Background Art

[0002] In recent years, with the increase in the speed of urban rail vehicles, the increase in vehicle marshaling length and the reduction in tunnel cross-section, the aerodynamic load of the door system during vehicle operation has become increasingly large. The dynamic sound insulation level of the door system under this condition has received more and more attention because it is related to passenger comfort. The use of a reasonable and effective dynamic sound insulation test system and method is the premise for evaluating, analyzing and improving the dynamic sound insulation performance of the door system. Therefore, the research on the dynamic sound insulation performance test system and method of the door system is of great significance.

[0003] At present, the dynamic sound insulation performance test of the door system is mainly carried out by the step-by-step implementation of loading and sound insulation, that is, the door system is first subjected to a pressure differential loading test to test the deformation of each point of the door system under the pressure differential; then the door is installed in the gap filling wall of a conventional sound insulation test room, and the deformation of each point is simulated by gaskets or local loading; then the sound insulation of the door system is tested based on a static simulation environment. The deformation of the rubber strip in this test method is difficult to simulate, there is a deviation from the actual situation, and the process is relatively cumbersome and time-consuming. Therefore, this test method has not been promoted. Summary of the invention

[0004] The purpose of the present application is to provide a dynamic sound insulation test system for a vehicle door system, so as to improve the accuracy and efficiency of the sound insulation performance test of the door system under pressure difference.

[0005] In order to achieve the above objectives, this application is implemented by adopting the following technical solutions: In a first aspect, the present application provides a dynamic sound insulation test system for a vehicle door system, which includes an acoustic detection system, an air pressure difference generating device, and a pressure difference sensor; The acoustic detection system comprises a sound source room and a receiving room which are connected to each other, and a door system test piece is arranged between the two rooms; The acoustic detection system is provided with a first state and a second state, in which the receiving chamber is in a negative pressure state relative to the sound source chamber in the first state, and in which the receiving chamber is in a positive pressure state relative to the sound source chamber in the second state; The air pressure difference generating device is connected to the sound source chamber and the receiving chamber, and when working, pressurizes one chamber and depressurizes the other chamber to establish a pressure difference, so that the acoustic detection system can perform a dynamic sound insulation test under a pressure difference environment; The differential pressure sensor is used to monitor the air pressure difference between the sound source room and the receiving room.

[0006] According to a further solution of the present application, the air pressure difference generating device includes a pressure difference generator, valve one, valve two, valve three and valve four; one end of valve one and valve two are connected in parallel to the air outlet of the pressure difference generator, and one end of valve three and valve four are connected in parallel to the air inlet of the pressure difference generator; the other end of valve one and valve three is connected in parallel to the sound source chamber, and the other end of valve two and valve four is connected in parallel to the sound source chamber.

[0007] According to a further solution of the present application, the regulating valves 1, 2, 3 and 4 can switch the acoustic detection system between a first state and a second state; by closing valve 2 and 3 and opening valve 1 and 4, the acoustic detection system switches to the first state and can adjust the gas flow through regulating valve 1 or valve 4; by closing valve 1 and 4 and opening valve 2 and 3, the acoustic detection system switches to the second state and can adjust the gas flow through valve 2 and 3.

[0008] According to a further solution of the present application, a muffler is provided at the air outlet of the air pressure difference generating device, and the outlet of the air path connected to the sound source room and the receiving room is in the shape of a trumpet, so that when the system is in a stable pressure state, the background noise in the receiving room is at least 6dB lower than the total sound pressure level of the sound source room and the background noise superimposed, which meets the requirements of the sound insulation test standards and lays the foundation for the dynamic sound insulation test of the vehicle door system.

[0009] According to a further solution of the present application, a sound source room sound source and a sound source room microphone are provided in the sound source room, and the sound source room sound source and the sound source room microphone are installed in the internal space of the sound source room.

[0010] In a further solution, a receiving room sound source and a receiving room microphone are provided in the receiving room, and the receiving room sound source and the receiving room microphone are installed in the internal space of the receiving room.

[0011] A further solution of the present application also includes a controller, and the controller signal connects the acoustic detection system and the air pressure difference generating device.

[0012] In a second aspect, the present application provides a testing method based on the above-mentioned door system dynamic sound insulation testing system, which comprises the following steps: Installing the door system test piece at the test opening of the acoustic detection system, and calibrating the acoustic detection system; The acoustic detection system is switched to a first state, the sound source room is pressurized, the receiving room is depressurized, and the sound source room and the receiving room work to perform a dynamic sound insulation test; The acoustic detection system is switched to the second state, the sound source room is depressurized, the receiving room is pressurized, and the sound source room and the receiving room are operated to perform a dynamic sound insulation test.

[0013] According to a further solution of the present application, when the door system test piece is fixed, the inner side of the door system test piece 4 faces the receiving room and the outer side faces the sound source room; Start the differential pressure generator, close valve 2 and valve 3, open any one of valve 1 and valve 4, and slowly open the other valve until the differential pressure sensor reaches and stabilizes at the test pressure state, thereby achieving the first state of the acoustic detection system; Start the differential pressure generator, close valve one and valve four, open any one of valves two and three, and slowly open the other valve until the differential pressure sensor reaches and stabilizes at the test pressure state, thereby realizing the second state of the acoustic detection system.

[0014] The beneficial effects of this application are: The dynamic sound insulation test system for the vehicle door system designed in the present application uses one blowing and one suction in two chambers during the test to establish and stably control the pressure difference between the inside and outside of the vehicle door. Compared with the traditional step-by-step loading and sound insulation implementation method, this test method can truly simulate the deformation of the rubber strip under the pressure difference condition, the test result is more accurate, and the operation method is simpler and less time-consuming.

[0015] In addition, the air pressure difference generating device uses a circuit constructed by multiple control valves to switch the pressure difference direction between the two chambers of the same air pressure difference generating device, which can avoid using multiple sets of air pressure difference generating devices to suck and blow air to each chamber respectively. Therefore, the test system is simple, reliable and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a dynamic sound insulation test system for a vehicle door system according to an embodiment of the present application; Figure 2 This is a flow chart of a test method of a dynamic sound insulation test system for a vehicle door system in Embodiment 2 of the present application; in: 1. Acoustic detection system; 2. Air pressure difference generator; 3. Pressure difference sensor; 4. Door system test piece 101, sound source room; 102, receiving room; 103, test hole; 101-1, sound source in the sound source room; 101-2, microphone in the sound source room; 102-1, sound source in the receiving room; 102-2, microphone in the receiving room; 201, pressure difference generator; 202a, valve one; 202b, valve two; 202c, valve three; 202d, valve four; 203, muffler; 201-1, air inlet; 201-2, air outlet. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Embodiment 1

[0018] like Figure 1 As shown, in this embodiment, a dynamic sound insulation test system for a vehicle door system is disclosed, which includes an acoustic detection system 1 and an air pressure difference generating device 2; the acoustic detection system 1 includes a sound source chamber 101 and a receiving chamber 102 that are connected, a pressure difference sensor 3 is connected between the sound source chamber 101 and the receiving chamber 102, a door system test piece 4 is arranged between the sound source chamber 101 and the receiving chamber 102, the sound source chamber 101 generates sound, and the receiving chamber 102 is used to receive sound waves in the sound source chamber 101 that pass through the system test piece 4, the air pressure difference generating device 2 of this system connects the sound source chamber 101 and the receiving chamber 102, and ... Device 2 is used to synchronously adjust the air pressure in the sound source room 101 and the receiving room 102 to simulate the air pressure difference between the inside and outside of the train. When the air pressure difference generating device 2 is started, the acoustic detection system 1 can realize the first state or the second state. In the first state, the sound source room 101 is pressurized and the receiving room 102 is depressurized. In the second state, the sound source room 101 is depressurized and the receiving room 102 is pressurized. During the simulation of this embodiment, one side of the receiving room 102 is used as the inside of the train, and one side of the sound source room 101 is used as the outside of the train. The first state and the second state of the acoustic detection system 1 can be switched freely.

[0019] When in use, the acoustic detection system 1 is switched between the first state and the second state through the air pressure difference generating device 2. In the corresponding state, that is, the scenario when there is an internal and external pressure difference in the vehicle door system is simulated, in this scenario, the sound source room 101 and the receiving room 102 are started, and the sound insulation performance of the door system specimen 4 is tested.

[0020] The sound source room 101 in this embodiment is provided with a sound source room sound source 101-1, a sound source room microphone 101-2, a sound level meter, a filter, a power amplifier, etc., and its entrance can accommodate the door system test piece 4 to enter, and the sound source room microphone 101-2 can be a single microphone that moves autonomously or multiple microphones that are staggered. The microphone position requirements refer to the relevant standards; the receiving room 102 includes a receiving room sound source 102-1, a receiving room microphone 102-2, an analyzer, a power amplifier, a sound level meter, etc., and the receiving room microphone 102-2 can be a single microphone that moves autonomously or multiple microphones that are staggered; In this embodiment, the air pressure difference generating device 2 is arranged outside the acoustic detection system 1, and the air pressure difference generating device 2 includes a pressure difference generator 201, a first air circuit and a second air circuit, wherein the first air circuit includes a valve 1 202a and a valve 4 202d, one end of the valve 1 202a is connected to the air outlet 201-2 of the pressure difference generator 201 through a pipeline, and the other end of the pipeline is connected to the sound source chamber 101, and one end of the valve 4 202d is connected to the air inlet 201-1 of the pressure difference generator 201 through a pipeline, and the other end of the pipeline is connected to the receiving chamber 102; The second gas circuit includes valve 2 202b and valve 3 202c. One end of valve 202b is connected to the receiving chamber 102 through a pipeline, and the other end is connected to the air outlet 201-2 of the pressure difference generator 201. One end of valve 3 202c is connected to the sound source chamber 101 through a pipeline, and the other end is connected to the air inlet 201-1 of the pressure difference generator 201. Generally, the pressure difference generator 201 is a fluid pressure boosting and conveying device. The second gas circuit and the second gas circuit share a pressure difference generator 201. The first gas circuit and the second gas circuit are closed to adjust the acoustic detection system 1 to switch between the first state and the second state.

[0021] Combined with Figure 1 In actual production, the air inlet 201-1 corresponds to the air path I1 and the air path I2, and the air outlet 201-2 corresponds to the air path E1 and the air path E2. The air paths E1 and I1 merge into R1 leading to the sound source chamber 101, and the air paths E2 and I2 merge into R2 leading to the receiving chamber 102, thereby constructing a bridge-type air path; the air pressure difference generating device 2 connects the sound source chamber 101 and the receiving chamber 102, and when working, pressurizes one chamber while depressurizing the other chamber, thereby establishing a pressure difference, and realizing the establishment and stable control of the pressure difference between the two chambers; valve one 202a, valve two 202b, valve three 202c, and valve four 202d can control the opening and closing and flow control of air paths E1, air paths E2, air paths I1, and air paths I2, and the same set of air pressure difference generating devices 2 can be used to realize the switching of the pressure difference direction between the two chambers.

[0022] In this embodiment, the H port and the L port of the pressure difference sensor 3 are respectively connected to the receiving chamber 102 and the sound source chamber 101 for feeding back the pressure difference between the two chambers.

[0023] A muffler 203 is installed at the air outlet 201-2 of the pressure difference generator 201 in this embodiment to reduce the airflow noise in the air path. In addition, the outlet where the pipeline is connected to the receiving room 102 and the sound source room 101 is a trumpet-shaped structure. In actual use, the background noise of the receiving room 102 is at least 6dB lower than the total sound pressure level of the sound source room sound source 101-1 and the background noise after superposition.

[0024] The dynamic sound insulation test system for the vehicle door system has two modes for establishing and maintaining pressure difference: manual mode and automatic mode. The automatic mode uses a controller to control system pressure and flow; the manual mode controls each valve for manual flow regulation to establish and stably control the pressure difference ΔP0 between the two chambers.

[0025] The key technology of the present invention is: The system of the present application includes a set of air pressure difference generating device with sufficient air volume, and its air inlet 201-1 and air outlet 201-2 are connected to the sound source chamber 101 and the receiving chamber 102 on both sides of the vehicle door through an air path, so that the pressure difference between the inside and outside of the vehicle door can be established and stably controlled by blowing and sucking in the two chambers at the same time; the pressure difference direction can be switched on the same set of air pressure difference generating device through a bridge air path.

[0026] The second key technology of the present invention is: The air pressure difference generating device is provided with a silencer for noise reduction, and the outlets where the pipelines are connected to the receiving room and the sound source room are in a trumpet shape. Embodiment 2

[0027] This embodiment is based on the system of the above-mentioned embodiment 1, and provides a testing method according to the system, which includes the following steps: Step 1: Install the vehicle door system test piece 4 at the test hole 103 of the acoustic detection system 1, with the inner side of the vehicle door system test piece 4 facing the receiving room 102 and the outer side facing the sound source room 101; Step 2: The sound source 101-1 in the sound source room, the microphone 101-2 in the sound source room, the sound source 102-1 in the receiving room, the microphone 102-2 in the receiving room, the sound level meter, the filter, the power amplifier, etc. in the acoustic detection system 1 are installed, arranged and calibrated.

[0028] Step 3: Close valve 1 202a, valve 2 202b, valve 3 202c, valve 4 202d, and open the differential pressure generator 201; Step 4: Use the following method to establish a pressure difference between the receiving chamber 102 and the sound source chamber 101 and stabilize it at a specified pressure state: if the positive pressure working condition of the door system is to be simulated, that is, the receiving chamber 102 is at a positive pressure relative to the sound source chamber 101, then one of the valves 202b or 202c is fully opened, and the other is slowly opened until the pressure difference sensor 3 reaches and stabilizes at a specified pressure state; if the negative pressure working condition of the door system is to be simulated, that is, the receiving chamber 102 is at a negative pressure relative to the sound source chamber 101, then one of the valves 202a and 202d is fully opened, and the other is slowly opened until the pressure difference sensor 3 reaches and stabilizes at a specified pressure state; Step 5: When the system is in a stable voltage state, perform a sound insulation test according to the method given in the existing standard, and calculate the sound insulation value with reference to the ISO 10140-2 sound insulation calculation formula to obtain the dynamic sound insulation value of the door system under pneumatic loading.

[0029] Step 6: Turn off the pressure difference generator 201, open the sealed doors of the sound source chamber 101 and the receiving chamber 102 to release the pressure, and disassemble the vehicle door system specimen 4.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

Claims

1. A dynamic sound insulation test system for a vehicle door system, characterized in that: It comprises an acoustic detection system (1), an air pressure difference generating device (2) and a pressure difference sensor (3); The acoustic detection system (1) comprises a sound source room (101) and a receiving room (102); The acoustic detection system (1) is provided with a first state and a second state, wherein in the first state, the receiving chamber (102) is in a negative pressure state relative to the sound source chamber (101), and in the second state, the receiving chamber (102) is in a positive pressure state relative to the sound source chamber (101); The air pressure difference generating device (2) is connected to the sound source chamber (101) and the receiving chamber (102), and when in operation, pressurizes one chamber while depressurizing the other chamber to establish a pressure difference, so that the acoustic detection system (1) can perform a dynamic sound insulation test in a pressure difference environment; The pressure difference sensor (3) is used to monitor the air pressure difference between the sound source chamber (101) and the receiving chamber (102).

2. The door system dynamic sound insulation test system according to claim 1, characterized in that: The air pressure difference generating device (2) comprises a pressure difference generator (201), valve one (202a), valve two (202b), valve three (202c) and valve four (202d); one end of valve one (202a) and valve two (202b) are connected in parallel to an air outlet (201-2) of the pressure difference generator (201), and one end of valve three (202c) and valve four (202d) are connected in parallel to an air inlet (201-1) of the pressure difference generator (201); the other ends of valve one (202a) and valve three (202c) are connected in parallel to a sound source chamber (101), and the other ends of valve two (202b) and valve four (202d) are connected in parallel to a receiving chamber (102).

3. The door system dynamic sound insulation test system according to claim 2, characterized in that: The regulating valve one (202a), valve two (202b), valve three (202c) and valve four (202d) are capable of switching the acoustic detection system (1) between a first state and a second state; by closing valve two (202b) and valve three (202c), and opening valve one (202a) and valve four (202d), the acoustic detection system (1) switches to the first state and can adjust the gas flow rate through regulating valve one (202a) or valve four (202d); by closing valve one (202a) and valve four (202d), and opening valve two (202b) and valve three (202c), the acoustic detection system (1) switches to the second state and can adjust the gas flow rate through valve two (202b) and valve three (202c).

4. The door system dynamic sound insulation test system according to claim 1, characterized in that: A silencer (203) is provided at the air outlet (201-2) of the air pressure difference generating device (2), and the outlet where the air path connects to the sound source chamber (101) and the receiving chamber (102) is in a trumpet shape.

5. The door system dynamic sound insulation test system according to claim 1, characterized in that: The sound source room (101) is provided with a sound source room sound source (101-1), a sound source room microphone (101-2), etc., and the sound source room sound source (101-1), the sound source room microphone (101-2), etc. are installed in the internal space of the sound source room (101).

6. The door system dynamic sound insulation test system according to claim 5, characterized in that: A receiving room sound source (102-1) and a receiving room microphone (102-2) etc. are provided in the receiving room (102); the receiving room sound source (102-1), the receiving room microphone (102-2) etc. are installed in the internal space of the receiving room (102).

7. The door system dynamic sound insulation test system according to claim 1, characterized in that: It also includes a controller, the controller signal connecting the acoustic detection system (1) and the air pressure difference generating device (2).

8. A testing method based on the dynamic sound insulation testing system for a vehicle door system according to claims 1 to 7, characterized in that: include: Installing the door system test piece (4) at the test opening (103) of the acoustic detection system (1), and calibrating the acoustic detection system (1); The acoustic detection system (1) is switched to a first state, the sound source chamber (101) is pressurized, the receiving chamber (102) is depressurized, and the sound source chamber (101) and the receiving chamber (102) are operated to perform a dynamic sound insulation test; The acoustic detection system (1) is switched to a second state, the interior of the sound source room (101) is depressurized, the interior of the receiving room (102) is pressurized, and the sound source room (101) and the receiving room (102) are operated to perform a dynamic sound insulation test.

9. The testing method of a vehicle door system dynamic sound insulation testing system according to claim 1, characterized in that: include: When the door system test piece (4) is fixed, the inner side of the vehicle door system test piece (4) faces the receiving room (102) and the outer side faces the sound source room (101); Starting the differential pressure generator (201), closing valve two (202b) and valve three (202c), opening any one of valve one (202a) and valve four (202d), and slowly opening the other valve until the differential pressure sensor (3) reaches and stabilizes at a test pressure state, thereby achieving a first state of the acoustic detection system (1); The differential pressure generator (201) is started, valve one (202a) and valve four (202d) are closed, and any one of valve two (202b) and valve three (202c) is opened, and the other valve is slowly opened until the differential pressure sensor (3) reaches and stabilizes at the test pressure state, thereby achieving the second state of the acoustic detection system (1).

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