Altitude self-adaptive train traction cooling ventilation quantity test method and system

Abstract

The invention relates to the technical field of high-speed train traction equipment volume flow and mass flow measurement, and discloses an altitude self-adaptive train traction cooling ventilation quantity test method and system. The method comprises the following steps: firstly, collecting static pressures in equipment cabins and outer ring temperatures of air inlets in the cabins of a test train in a first target area and a second target area respectively, and calculating to obtain atmospheric densities at different altitudes, and then measuring the gas density of the first target area, the coefficient of a differential pressure sensor and the atmospheric density of the second target area. The volume flow at different altitudes is obtained through conversion, then the mass flow at different altitudes is obtained, the variable of density is considered when the flow at different altitudes is measured, and the measurement accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of volume flow and mass flow measurement of high-speed train traction equipment, and in particular to an altitude-adaptive train traction cooling ventilation volume testing method and system. Background Art

[0002] The equipment compartment of a high-speed train contains a variety of traction equipment, such as traction transformers, traction converters, traction motor cooling fans, etc. In the daily maintenance and ventilation and heat dissipation performance research of high-speed trains, the mass flow rate and volume flow rate of the air inlet and outlet of each traction equipment are important evaluation parameters. The commonly used flow measurement method is to measure the measurement pressure and the reference pressure through a differential pressure sensor, determine the flow rate at the measuring point according to the differential pressure between the two, and then convert the flow rate. However, due to the large span of the train operation, the atmospheric density is also changing at any time due to changes in altitude. Ignoring the density change will cause large errors in the flow measurement results, which is not conducive to accurate data collection and effective analysis. It can be seen that the measurement method in the prior art will produce large errors in areas with large altitude differences, and the measurement results are less accurate. Summary of the invention

[0003] The purpose of the present invention is to disclose an altitude-adaptive train traction cooling ventilation volume testing method and system to solve the problem that the measurement method in the prior art will produce large errors in areas with large altitude differences and the measurement results are of low accuracy.

[0004] To achieve the above-mentioned purpose, in a first aspect, the present invention discloses an altitude-adaptive train traction cooling ventilation volume testing method, comprising:

[0005] S1: Collect the static pressure in the equipment cabin and the outer ring temperature of the air inlet in the cabin of the test train in the first target area and the second target area respectively, and calculate the atmospheric density in the first target area;

[0006] S2: calculating the atmospheric density of a second target area based on the atmospheric density of the first target area, wherein the altitude of the second target area is higher than the altitude of the first target area;

[0007] S3: determining a sensor coefficient of a second target area based on a sensor coefficient of the first target area;

[0008] S4: Calculate the volume flow rate corresponding to the second target area through the sensor coefficient of the second target area, the number of measuring points, the ventilation area of ​​the traction equipment, the analog signal of the differential pressure sensor of the first target area, and the ratio of the atmospheric density between the first target area and the second target area;

[0009] S5: Calculate the mass flow rate of the second target area through the atmospheric density of the second target area and the volume flow rate.

[0010] In a second aspect, the present invention further discloses an altitude adaptive train traction cooling ventilation volume test system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0011] The present invention has the following beneficial effects:

[0012] The present application provides an altitude-adaptive train traction cooling ventilation volume test method, which first collects the static pressure in the equipment cabin and the outer ring temperature of the air inlet in the cabin of the test train in the first target area and the second target area respectively, and calculates the atmospheric density at different altitudes. Then, by measuring the gas density and the differential pressure sensor coefficient in the first target area and the atmospheric density in the second target area, the volume flow rate at different altitudes is converted, and then the mass flow rate at different altitudes is obtained. Then, when measuring the flow rate at different altitudes, the density variable is considered to improve the measurement accuracy.

[0013] The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0015] Figure 1 It is a flow chart of an altitude adaptive train traction cooling ventilation volume testing method according to a preferred embodiment of the present application. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are only a 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 creative work are within the scope of protection of the present invention.

[0017] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate quantity restrictions, but indicate the existence of at least one. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0018] It should be understood that when a high-speed train runs in an area with a large altitude difference, the atmospheric density changes with the altitude, causing errors in the measurement of the traction equipment flow. Based on this, the present application provides an altitude-adaptive train traction cooling ventilation volume test method. In the present application, the ventilation volume includes volume flow and mass flow.

[0019] See also Figure 1 The present application provides an altitude adaptive train traction cooling ventilation volume test method, comprising:

[0020] S1: Collect the static pressure in the equipment cabin and the outer ring temperature of the air inlet in the cabin of the test train in the first target area and the second target area respectively, and calculate the atmospheric density in the first target area;

[0021] S2: calculating the atmospheric density of a second target area based on the atmospheric density of the first target area, wherein the altitude of the second target area is higher than the altitude of the first target area;

[0022] S3: determining a sensor coefficient of a second target area based on a sensor coefficient of the first target area;

[0023] S4: Calculate the volume flow rate corresponding to the second target area through the sensor coefficient of the second target area, the number of measuring points, the ventilation area of ​​the traction equipment, the analog signal of the differential pressure sensor of the first target area, and the ratio of the atmospheric density between the first target area and the second target area;

[0024] S5: Calculate the mass flow rate of the second target area through the atmospheric density of the second target area and the volume flow rate.

[0025] In this embodiment, the first target area refers to the plain area, and the second target area refers to the plateau area.

[0026] Methods for collecting the static pressure in the equipment cabin and the outer ring temperature of the air inlet in the cabin in the first target area and the second target area of ​​the test train include but are not limited to: arranging a pressure-sensitive plate at the position of the measuring point to be measured, connecting the pressure-sensitive plate to one end of the pressure hose, connecting the other end of the pressure hose to a differential pressure sensor, and connecting the differential pressure sensor to the collector through a signal line to realize the collection and reading of static pressure data; and arranging a patch-type or probe-type temperature sensor at the position of the measuring point to be measured, and connecting the sensor to the collector through a signal line to realize the collection and reading of temperature data.

[0027] The above-mentioned altitude-adaptive train traction cooling ventilation volume test method first collects the static pressure in the equipment cabin and the outer ring temperature of the air inlet in the cabin of the test train in the first target area and the second target area respectively, calculates the atmospheric density at different altitudes, and then measures the gas density and differential pressure sensor coefficient in the first target area and the atmospheric density in the second target area to convert the volume flow rate at different altitudes, and then obtains the mass flow rate at different altitudes, and then considers the density variable when measuring the flow rate at different altitudes to improve the measurement accuracy.

[0028] Optionally, the S2 includes:

[0029] determining a density ratio between the first target area and the second target area;

[0030] The atmospheric density of the second target area is calculated based on the density ratio and the atmospheric density of the first target area, satisfying the following relationship:

[0031] ρ x / ρ0=(P x / T x )·(T0 / P0);

[0032] Where P x The static pressure in the equipment cabin of the second target area, T x represents the outer ring temperature of the cabin air inlet of the second target area, P0 represents the static pressure in the equipment cabin of the first target area, T0 represents the outer ring temperature of the cabin air inlet of the first target area, and ρ0 represents the atmospheric density of the first target area.

[0033] In one example, the temperature in the plain area (altitude 0m) is T0, then T0 = 20℃ = 293.15K, P0 = 101.325kPa, from which the atmospheric density ρ0 = 1.205kg / m 3 Since the ambient temperature and pressure of the test train change at a certain altitude, the temperature in the plateau area is defined as T x , pressure is P x, where real-time data is obtained from the static pressure measurement point in the cabin and the outer ring temperature test of the cabin air inlet. The above variables can be used to solve the atmospheric density ρ in the plateau area x (Unit: kg / m 3 ).

[0034] Optionally, the S3 includes:

[0035] Calculate the wind speed tube dynamic pressure in the first target area to satisfy the following relationship:

[0036] P=0.5ρ0v 2 ;

[0037] In the formula, ρ0 represents the atmospheric density of the first target area, and v represents the flow velocity;

[0038] The relationship between the analog voltage signal collected by the differential pressure sensor and the physical quantity determined based on the wind speed tube dynamic pressure satisfies the following relationship:

[0039] ΔU0=C0·P=C(ρ0)·v 2 ;

[0040] Where C(ρ0) is the sensor coefficient related to the atmospheric density in the first target area;

[0041] The relationship between the analog voltage signal collected by the differential pressure sensor in the second target area and the physical quantity satisfies the following relationship:

[0042] ΔU x =C(ρ x )·v 2 ;

[0043] Among them, C(ρ x ) is the sensor coefficient related to the atmospheric density in the second target area;

[0044] The ratio of the sensor coefficient of the first target area to the sensor coefficient of the second target area is calculated to satisfy the following relationship:

[0045] C(ρ0) / C(ρ x )=ρ0 / ρ x ;

[0046] For the second target area, the above formula is used to solve the analog voltage signal of the second target area under the premise that the sensor coefficient of the second target area is unknown:

[0047] ΔU x =C(ρ0)·ρ x v 2 / ρ0.

[0048] Optionally, the S4 includes:

[0049] The differential pressure sensor analog signal of the first target area is collected, and the wind speed and the wind speed at the measuring point are calculated according to the differential pressure sensor analog signal of the first target area, which satisfy the following relationship:

[0050]

[0051] In the formula, ∑v represents the wind speed and the wind speed at the measuring point, ΔU0 represents the analog voltage signal collected by the differential pressure sensor in the first target area, and C(ρ x ) represents the sensor coefficient related to the atmospheric density of the second target area, ρ0 represents the atmospheric density of the first target area, ρ x Indicates the atmospheric density of the second target area;

[0052] Based on the wind speed at the measuring point, the number of measuring points and the ventilation area of ​​the traction equipment, the volume flow rate of the second target area is calculated by the volume flow rate calculation formula to satisfy the following relationship:

[0053] Q V =∑v / n·A·3600;

[0054] In the formula, n represents the number of measuring points, and A represents the ventilation area of ​​the traction equipment.

[0055] Optionally, the S5 includes:

[0056] Based on the volume flow, the mass flow rate of the second target area is calculated by the mass flow rate calculation formula, which satisfies the following relationship:

[0057] Q M =ρ x Q V .

[0058] In a complete example, the implementation steps of the above altitude adaptive train traction cooling ventilation test method are as follows:

[0059] Collect the static pressure P in the equipment cabin of the test train in the plateau area x =81470.5Pa, cabin air inlet outer ring temperature T x =21.84℃(294.99K), the known plain area (altitude is 0m) pressure P0=101325Pa temperature T0=20℃(293.15K), and the atmospheric density ρ0=1.205kg / m 3 According to the following formula, the atmospheric density ρ in the plateau area can be solved x =0.963kg / m 3 .

[0060] ρ x / v0=(P x / T x )·(T0 / P0);

[0061] Furthermore, the range and sensor coefficient of a certain type of sensor are shown in Table 1. In this test, a sensor with a range of 500Pa is selected, and the corresponding sensor coefficient C(ρ0) is 0.0032.

[0062] Table 1 Range and sensor coefficient of a certain type of sensor

[0063] Sensor range (Pa) <![CDATA[Calibration coefficient C(ρ0)]]> 250 0.0064 500 0.0032 1250 0.00128 2500 0.00064

[0064] The analog signal of the differential pressure sensor measured in the plain area is 0.026V. Assume that the number of test points in this test is n = 1, and the ventilation area of ​​the traction equipment is A = 1m 2 , the wind speed at the measuring point can be calculated by the following formula: ∑v=3.189m / s.

[0065]

[0066] Furthermore, the volume flow rate Q in the plateau area is obtained by the volume flow rate calculation formula V =11480.4m 3 / h.

[0067] The derivation process is as follows:

[0068] Volume flow rate: Q V =∑v / n·A·3600

[0069] Because: C(ρ0) / C(ρ x )=ρ0 / ·ρ x

[0070] We get: C(ρ x )=C(ρ0)·ρ x / ρ0

[0071] and then,

[0072] Furthermore, the mass flow rate Q in the plateau area is obtained by the mass flow rate calculation formula M =11055.6kg / h.

[0073] Q M =ρ x Q V .

[0074] The derivation process is as follows:

[0075] Since the gas state equation is as follows:

[0076] Gas state equation:

[0077] P (pressure) · V (volume) = nR (constant) · T (temperature)

[0078] P0·V0 / T0=P x ·V x / T x ;

[0079] And because:

[0080] ρ x / ρ0=(m / V x ) / (m / V0)

[0081] =V0 / V x ;

[0082] We can get: x / ρ0=(P x / T x )·(T0 / P0);

[0083] Volume flow:

[0084] Q M =ρ x Q V ;

[0085] because:

[0086] C(ρ0) / C(ρ x )=ρ0 / ρ x ;

[0087] get:

[0088] C(ρ0) / C(ρ x )=ρ0 / ρ x ;

[0089] And because:

[0090] Q V =(Σv / n(number of measuring points))·A(ventilation area)·3600m 3 / h;

[0091] Substitute:

[0092]

[0093] get:

[0094]

[0095] Substitute:

[0096] ρ x =ρ0·C(ρ x ) / C(ρ0);

[0097]

[0098] The present application also provides an altitude-adaptive train traction cooling ventilation volume test system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the computer program. The altitude-adaptive train traction cooling ventilation volume test system can implement various embodiments of the altitude-adaptive train traction cooling ventilation volume test method described above, and can achieve the same beneficial effects, which will not be described in detail here.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An altitude adaptive train traction cooling ventilation volume test method, characterized in that: include: S1: Collect the static pressure in the equipment cabin and the outer ring temperature of the air inlet in the cabin of the test train in the first target area and the second target area respectively, and calculate the atmospheric density in the first target area; S2: calculating the atmospheric density of a second target area based on the atmospheric density of the first target area, wherein the altitude of the second target area is higher than the altitude of the first target area; S3: determining a sensor coefficient of a second target area based on a sensor coefficient of the first target area; S4: Calculate the volume flow rate corresponding to the second target area through the sensor coefficient of the second target area, the number of measuring points, the ventilation area of ​​the traction equipment, the analog signal of the differential pressure sensor of the first target area, and the ratio of the atmospheric density between the first target area and the second target area; S5: Calculate the mass flow rate of the second target area through the atmospheric density of the second target area and the volume flow rate.

2. The altitude adaptive train traction cooling ventilation volume test method according to claim 1 is characterized in that: The S2 includes: determining a density ratio between the first target area and the second target area; The atmospheric density of the second target area is calculated based on the density ratio and the atmospheric density of the first target area, satisfying the following relationship: r x / ρ0=(P x / T x )·(T0 / P0); Where P x represents the static pressure in the equipment cabin of the second target area, T x represents the outer ring temperature of the cabin air inlet of the second target area, P0 represents the static pressure in the equipment cabin of the first target area, T0 represents the outer ring temperature of the cabin air inlet of the first target area, and ρ0 represents the atmospheric density of the first target area.

3. The altitude adaptive train traction cooling ventilation volume test method according to claim 1, characterized in that: The S3 includes: Calculate the wind speed tube dynamic pressure in the first target area to satisfy the following relationship: P=0.5ρ0v 2 ; Where ρ0 represents the atmospheric density of the first target area, v represents the flow velocity, The relationship between the analog voltage signal collected by the differential pressure sensor in the first target area and the physical quantity is determined based on the wind speed tube dynamic pressure, and the relationship satisfies the following relationship: ΔU0=C0·P=C(ρ0)·v 2 ; Where C(ρ0) is the sensor coefficient related to the atmospheric density in the first target area; The relationship between the analog voltage signal collected by the differential pressure sensor in the second target area and the physical quantity satisfies the following relationship: D.U. x =C(ρ x )·v 2 ; Among them, C(ρ x ) is the sensor coefficient related to the atmospheric density in the second target area; The ratio of the sensor coefficient of the first target area to the sensor coefficient of the second target area is calculated to satisfy the following relationship: C(ρ0) / C(ρ x )=ρ0 / ρ x ; For the second target area, the above formula is used to solve the analog voltage signal of the second target area under the premise that the sensor coefficient of the second target area is unknown: D.U. x =C(ρ0)·ρ x v 2 / ρ0.

4. The altitude adaptive train traction cooling ventilation volume test method according to claim 1, characterized in that: The S4 includes: The differential pressure sensor analog signal of the first target area is collected, and the wind speed and the wind speed at the measuring point are calculated according to the differential pressure sensor analog signal of the first target area, which satisfy the following relationship: In the formula, ∑v represents the wind speed and the wind speed at the measuring point, ΔU0 represents the analog voltage signal collected by the differential pressure sensor in the first target area, and C(ρ x ) represents the sensor coefficient related to the atmospheric density of the second target area, ρ0 represents the atmospheric density of the first target area, ρ x Indicates the atmospheric density of the second target area; Based on the wind speed at the measuring point, the number of measuring points and the ventilation area of ​​the traction equipment, the volume flow rate of the second target area is calculated by the volume flow rate calculation formula to satisfy the following relationship: Q V =∑v / n·A·3600; In the formula, n represents the number of measuring points, and A represents the ventilation area of ​​the traction equipment.

5. The altitude adaptive train traction cooling ventilation volume test method according to claim 1, characterized in that: The S5 includes: Based on the volume flow, the mass flow rate of the second target area is calculated by the mass flow rate calculation formula, which satisfies the following relationship: Q M =ρ x ·Q V ; Right now:

6. An altitude adaptive train traction cooling ventilation volume test system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method described in any one of claims 1 to 5 are implemented.

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