Sealed test cabin device for simulating train driving wind and wind speed control method thereof

Abstract

The invention discloses a full-sealed test cabin device for simulating train driving wind and a wind speed control method thereof, and relates to the technical field of sealed test cabins for train driving wind, and the full-sealed test cabin device comprises a sealed test cabin, an air blower, an air inlet duct, a wind speed sensor, a sealed test cabin, an air inducing duct, an induced draft fan, test wheels and a motor transmission controller. The air inlet duct is arranged between the sealed test bin and the closed test bin, and an air blower is arranged between the sealed test bin and the air inlet duct; the air blower is connected to the sealing test bin through the air inlet duct, and the air speed sensor is installed at an air outlet of the air inlet duct; the air speed, the air blower rotating speed and the induced draft fan rotating speed are calculated and given according to the collected vehicle speed, the air speed changes along with the vehicle speed in the test process, and micro-negative pressure is formed in the test bin; through characteristic calibration, different wheels or brake discs have specific fitting curves, so that the test bench can accurately simulate driving wind under different brake working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of sealed test chambers for train running wind, in particular to a sealed test chamber device for simulating train running wind and a wind speed control method thereof. Background Art

[0002] During the braking process of a train, the relative movement between the braking device and the air will produce a phenomenon called running wind.

[0003] Bench testing of 1:1 brakes for railway rolling stock requires simulating the wind generated by a moving train. The train speed varies during braking, requiring the wind speed to vary proportionally with the speed.

[0004] Wind speed control is provided by the blower system, but is also affected by the action of the induced draft fan system and the movement of different wheels or brake discs. The wind speed needs to be calibrated under specific conditions to control the wind speed to change with the vehicle speed. Therefore, this application proposes a sealed test chamber device that simulates the wind of a train and its wind speed control method. Summary of the Invention

[0005] The object of the present invention is to provide a sealed test chamber device for simulating train running wind and a wind speed control method thereof, so as to solve the problems raised in the above background technology.

[0006] In a first aspect of the present invention, to achieve the above-mentioned object, the present invention provides the following technical solutions: a fully sealed test chamber device for simulating train travel wind, comprising a sealed test chamber, a blower, an air inlet duct, a wind speed sensor, a closed test chamber, an induced draft duct, an induced draft fan, test wheels, and a motor drive controller;

[0007] The air inlet duct is arranged between the sealing test chamber and the closed test chamber, and a blower is provided between the sealing test chamber and the air inlet duct;

[0008] The blower is connected to the sealed test chamber through an air inlet duct, the wind speed sensor is installed at the air outlet of the air inlet duct, the induced draft fan is connected to the sealed test chamber through the induced draft duct, the test wheel is located in the sealed test chamber, and the wheel motor that drives the test wheel is located outside the sealed test chamber.

[0009] In a specific embodiment, a blower motor is provided on one side of the blower, and the blower motor is used to drive the blower to work. A first incremental encoder is provided on the working end of the blower motor.

[0010] In a specific embodiment, an induced draft fan motor is provided on one side of the induced draft fan, and the induced draft fan motor is used to drive the induced draft fan to work. A second incremental encoder is provided at the working end of the induced draft fan motor.

[0011] In a specific embodiment, a third incremental encoder is provided at the working end of the wheel motor that drives the test wheel.

[0012] In a specific embodiment, the motor transmission controller is electrically connected to the blower motor, induced draft fan motor and wheel motor respectively.

[0013] In a second aspect, the present invention provides a method for controlling wind speed in a fully sealed test chamber device using the aforementioned simulated train wind, comprising the following steps:

[0014] Step 1: Characteristic calibration: First, the motor drive controller controls the linear acceleration of the blower motor, induced draft fan motor and wheel motor to run the blower to the initial speed n g0 , the induced draft fan runs to the initial speed n y0 The test wheel runs to the initial speed v0; during this period, the wind speed v is measured in real time by the wind speed sensor w0 ;

[0015] Step 2: Wind speed control: Determine the relationship between vehicle speed, wind speed, blower initial speed and induced draft fan initial speed through characteristic calibration. t Calculate the wind speed v wt , calculate the blower speed n according to the wind speed gt , induced draft fan speed n gt At t=t+1, the motor drive controller drives the blower motor and the induced draft fan motor to reach the corresponding speed n gt and n yt ;

[0016] In a specific embodiment, the specific method of characteristic calibration is:

[0017] S1. A slight negative pressure condition needs to be formed in the sealing test chamber, and the initial speed of the induced draft fan is n y0 and the initial blower speed n g0 In direct proportion, let the proportional coefficient be k1 and k1>1, that is

[0018] n y0 =k1·n g0

[0019] S2, the blower motor runs to the initial speed n g0 When the wind speed v w0 , wind speed v w0 and the initial blower speed n g0 The relationship between can be fitted as follows:

[0020] n g0 =a·v w04 +b·v w0 3 +c·v w0 2 +d·v w0 +e

[0021] Among them, a, b, c, d, and e are all constants;

[0022] S3, calculate the wind speed v according to the above S2 w0 The vehicle speed v0, wind speed v w0 It changes proportionally with the vehicle speed v0 and the wind speed is not greater than the vehicle speed. Let the proportional coefficient be k2 and k2≤1, that is

[0023] v0=k2·v w0

[0024] The wheel motor linearly accelerates to v0, and the characteristic calibration is completed.

[0025] In a specific embodiment, the specific method of wind speed control is:

[0026] S4, during the braking process, the vehicle speed changes from the initial speed v0 to v with time t. t , the proportional relationship between vehicle speed and wind speed is known, and the vehicle speed v under the test conditions is measured by the incremental encoder t , calculate the wind speed v at time t according to the above S3 wt ;

[0027]

[0028] S5, wind speed v at time t is known wt , according to the fitting formula in S2 above, calculate the induced draft fan speed n gt ;

[0029] n gt =a·v wt 4 +b·v wt 3 +c·v wt 2 +d·v wt +e

[0030] S6. Calculate the induced draft fan speed n at time t based on the proportional relationship in S1 above. yt ;

[0031] n yt =k1·n gt .

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention calculates the wind speed, blower speed, and induced draft fan speed based on the collected vehicle speed and gives them as given. During the test, the wind speed varies with the vehicle speed and a slight negative pressure is formed in the test chamber. Through characteristic calibration, different wheels or brake discs have specific fitting curves, so that the test bench can accurately simulate driving wind under different braking conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural diagram of the implementation principle of the sealed test chamber for simulating train running wind according to the present invention.

[0035] In the figure: 1. Sealed test chamber; 2. Blower; 3. Air inlet duct; 4. Wind speed sensor; 5. Sealed test chamber; 6. Induced air duct; 7. Induced draft fan; 8. Test wheels; 9. Motor drive controller. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] See also Figure 1 In a first aspect, the present invention provides: a fully sealed test chamber device for simulating train travel wind, comprising a sealed test chamber 1, a blower 2, an air inlet duct 3, a wind speed sensor 4, a closed test chamber 5, an induced draft duct 6, an induced draft fan 7, a test wheel 8, and a motor drive controller 9;

[0038] Among them, the air inlet duct 3 is arranged between the sealed test chamber 1 and the closed test chamber 5, and a blower 2 is provided between the sealed test chamber 1 and the air inlet duct 3; the blower 2 is connected to the sealed test chamber 1 through the air inlet duct 3, the wind speed sensor 4 is installed at the air outlet of the air inlet duct 3, the induced draft fan 7 is connected to the closed test chamber 5 through the induced draft duct 6, the test wheel 8 is located in the sealed test chamber 1, and the wheel motor that drives the test wheel 8 is located outside the sealed test chamber 1.

[0039] In a specific embodiment, a blower motor is provided on one side of the blower 2, and the blower motor is used to drive the blower 2 to work. A first incremental encoder is provided at the working end of the blower motor.

[0040] In a specific embodiment, an induced draft fan motor is provided on one side of the induced draft fan 7. The induced draft fan motor is used to drive the induced draft fan 7 to work, and a second incremental encoder is provided at the working end of the induced draft fan motor.

[0041] In a specific embodiment, a third incremental encoder is provided at the working end of the wheel motor that drives the test wheel 8 .

[0042] In a specific embodiment, the motor transmission controller 9 is electrically connected to the blower motor, the induced draft fan motor and the wheel motor respectively.

[0043] In a second aspect, the present invention provides a method for controlling wind speed in a fully sealed test chamber device using the aforementioned simulated train travel wind, comprising the following steps:

[0044] Step 1: Characteristic calibration: First, the motor drive controller controls the linear acceleration of the blower motor, induced draft fan motor and wheel motor to run the blower to the initial speed n g0 , the induced draft fan runs to the initial speed n y0 The test wheel runs to the initial speed v0; during this period, the wind speed v is measured in real time by the wind speed sensor w0 ;

[0045] Step 2: Wind speed control: Determine the relationship between vehicle speed, wind speed, blower initial speed and induced draft fan initial speed through characteristic calibration. t Calculate the wind speed v wt , calculate the blower speed n according to the wind speed gt , induced draft fan speed n gt At t=t+1, the motor drive controller drives the blower motor and the induced draft fan motor to reach the corresponding speed n gt and n yt ;

[0046] In a specific embodiment, the specific method of characteristic calibration is:

[0047] S1. A slight negative pressure condition needs to be formed in the sealing test chamber, and the initial speed of the induced draft fan is n y0 and the initial blower speed n g0 In direct proportion, let the proportional coefficient be k1 and k1>1, that is

[0048] n y0 =k1·n g0

[0049] S2, the blower motor runs to the initial speed n g0 When the wind speed v w0 , wind speed v w0 and the initial blower speed n g0 The relationship between can be fitted as follows:

[0050] n g0 =a·v w0 4 +b·v w0 3 +c·v w0 2 +d·vw0 +e

[0051] Among them, a, b, c, d, and e are all constants;

[0052] S3, calculate the wind speed v according to the above S2 w0 The vehicle speed v0, wind speed v w0 It changes proportionally with the vehicle speed v0 and the wind speed is not greater than the vehicle speed. Let the proportional coefficient be k2 and k2≤1, that is

[0053] v0=k2·v w0

[0054] The wheel motor linearly accelerates to v0, and the characteristic calibration is completed.

[0055] In a specific embodiment, the specific method of wind speed control is:

[0056] S4, during the braking process, the vehicle speed changes from the initial speed v0 to v with time t. t , the proportional relationship between vehicle speed and wind speed is known, and the vehicle speed v under the test conditions is measured by the incremental encoder t , calculate the wind speed v at time t according to the above S3 wt ;

[0057]

[0058] S5, wind speed v at time t is known wt , according to the fitting formula in S2 above, calculate the induced draft fan speed n gt ;

[0059] n gt =a·v wt 4 +b·v wt 3 +c·v wt 2 +d·v wt +e

[0060] S6. Calculate the induced draft fan speed n at time t based on the proportional relationship in S1 above. yt ;

[0061] n yt =k1·n gt .

[0062] In summary: the present invention determines the relationship between vehicle speed, wind speed, initial blower speed and initial induced draft fan speed through characteristic calibration, collects vehicle speed at a certain sampling point during the braking process, calculates the wind speed according to the formula and gives the blower and induced draft fan speed; compiles a computer control program according to the above fitting formula and its control method, reads the wheel speed measured by the incremental encoder in each control cycle, calculates the wind speed and gives the blower and induced draft fan speed, so that the blower and induced draft fan speeds are controlled as required until the braking process is completed.

[0063] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0064] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A fully sealed test chamber device for simulating train wind, characterized by: It comprises a sealed test chamber (1), a blower (2), an air inlet duct (3), a wind speed sensor (4), a sealed test chamber (5), an induced draft duct (6), an induced draft fan (7), a test wheel (8) and a motor drive controller (9); The air inlet duct (3) is arranged between the sealed test chamber (1) and the closed test chamber (5), and a blower (2) is provided between the sealed test chamber (1) and the air inlet duct (3); The blower (2) is connected to the sealed test chamber (1) via an air inlet duct (3), the wind speed sensor (4) is installed at the air outlet of the air inlet duct (3), the induced draft fan (7) is connected to the sealed test chamber (5) via an induced draft duct (6), the test wheel (8) is located in the sealed test chamber (1), and the wheel motor driving the test wheel (8) is located outside the sealed test chamber (1).

2. A fully sealed test chamber device for simulating train travel wind according to claim 1, characterized in that: A blower motor is provided on one side of the blower (2), and the blower motor is used to drive the blower (2) to work. A first incremental encoder is provided at the working end of the blower motor.

3. A fully sealed test chamber device for simulating train travel wind according to claim 1, characterized in that: An induced draft fan motor is provided on one side of the induced draft fan (7), and the induced draft fan motor is used to drive the induced draft fan (7) to work. A second incremental encoder is provided at the working end of the induced draft fan motor.

4. A fully sealed test chamber device for simulating train travel wind according to claim 1, characterized in that: A third incremental encoder is provided at the working end of the wheel motor that drives the test wheel (8).

5. The fully sealed test chamber device for simulating train running wind according to claim 1, characterized in that: The motor transmission controller (9) is electrically connected to the blower motor, the induced draft fan motor and the wheel motor respectively.

6. A method for controlling wind speed in a fully sealed test chamber device simulating train travel wind according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Characteristic calibration: First, the motor drive controller controls the linear acceleration of the blower motor, induced draft fan motor and wheel motor to run the blower to the initial speed n g0 , the induced draft fan runs to the initial speed n y0 The test wheel runs to the initial speed v0; during this period, the wind speed v is measured in real time by the wind speed sensor w0 ; Step 2: Wind speed control: Determine the relationship between vehicle speed, wind speed, blower initial speed and induced draft fan initial speed through characteristic calibration. t Calculate the wind speed v wt , calculate the blower speed n according to the wind speed gt , induced draft fan speed n gt At t=t+1, the motor drive controller drives the blower motor and the induced draft fan motor to reach the corresponding speed n gt and n yt。 7. The wind speed control method according to claim 6, characterized in that: The specific method of characteristic calibration is: S1. A slight negative pressure condition needs to be formed in the sealing test chamber, and the initial speed of the induced draft fan is n y0 and the initial blower speed n g0 In direct proportion, let the proportional coefficient be k1 and k1>1, that is n y0 =k1·n g0 S2, the blower motor runs to the initial speed n g0 When measuring wind speed v w0 , wind speed v w0 and the initial blower speed n g0 The relationship between can be fitted as follows: n g0 =a·v w0 4 +b·v w0 3 +c·v w0 2 +d·v w0 +e Among them, a, b, c, d, and e are all constants; S3, calculate the wind speed v according to the above S2 w0 The vehicle speed v0, wind speed v w0 It changes proportionally with the vehicle speed v0 and the wind speed is not greater than the vehicle speed. Let the proportional coefficient be k2 and k2≤1, that is v0=k2·v w0 The wheel motor linearly accelerates to v0, and the characteristic calibration is completed.

8. The wind speed control method according to claim 7, characterized in that: The specific method of wind speed control is: S4, during the braking process, the vehicle speed changes from the initial speed v0 to v with time t. t , the proportional relationship between vehicle speed and wind speed is known, and the vehicle speed v under the test conditions is measured by the incremental encoder t , calculate the wind speed v at time t according to the above S3 wt ; S5, wind speed v at time t is known wt , according to the fitting formula in S2 above, calculate the induced draft fan speed n gt ; n gt =a·v wt 4 +b·v wt 3 +c·v wt 2 +d·v wt +e S6. Calculate the induced draft fan speed n at time t based on the proportional relationship in S1 above. yt ; n yt =k1·n gt 。

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