CN109446609A - A kind of method for building up of the Thermal Synthetic field analysis model of Pantograph-OCS system - Google Patents
A kind of method for building up of the Thermal Synthetic field analysis model of Pantograph-OCS system Download PDFInfo
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- CN109446609A CN109446609A CN201811203909.1A CN201811203909A CN109446609A CN 109446609 A CN109446609 A CN 109446609A CN 201811203909 A CN201811203909 A CN 201811203909A CN 109446609 A CN109446609 A CN 109446609A
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Abstract
The invention discloses a kind of method for building up of the Thermal Synthetic field analysis model of Pantograph-OCS system, comprising the following steps: S1, calculates separately Joule heat and frictional heat in Pantograph-OCS system；S2, temperature rise of the Pantograph-OCS system compared to environment is determined according to Joule heat and frictional heat, calculates the heat dissipation of Pantograph-OCS system；S3, according to Joule heat, frictional heat and heat dissipation, determine Thermal Synthetic field analysis model when Pantograph-OCS system balance.The Thermal Synthetic field analysis model of Pantograph-OCS system provided by the invention, realizes the thermal field comprehensive analysis of frictional heat in Pantograph-OCS system, Joule heat and Thermal Synthetic, improves high speed bow net wear with current problem, provides scientific basis to improve bow net service life.
Description
Technical field
The invention belongs to Pantograph-OCS system thermal field analysis technical fields, and in particular to a kind of Thermal Synthetic field analysis of Pantograph-OCS system
The method for building up of model.
Background technique
For high-speed rail motor-car during persistent movement, the opposite sliding route of pantograph pan and contact line is analogous to " it "
Sub- shape studies the distribution in the temperature field during persistent movement, can be solution high speed bow net wear with current, realization bow net system
Thermal field comprehensive analysis, the raising bow net service life of uniting provide scientific basis.Bow net current-carrying system is that a complicated electric power heat is more
Physic field coupling system, temperature rise are the results of Joule heat and frictional heat heat dissipation comprehensive function.The maximum value of bow net wear rate takes
It is calorific value and the dynamic equilibrium of heat dissipation capacity certainly in rubbing surface contact point softens because of temperature rise the case where, and it is by opposite fortune
The comprehensive function of dynamic speed, friction factor, normal direction contact pressure and contact resistance electric current etc., has comparable complexity, therefore
How temperature field caused by various heating sources is modeled, and be in transient state or steady-state process in conjunction with it, to study its heat
Field changing rule, is current yet unresolved issue.
Summary of the invention
Aiming at the shortcomings in the prior art, the method for building up of the Thermal Synthetic field analysis model of Pantograph-OCS system provided by the invention
It solves and is difficult to couple comprehensive dynamic temperature field caused by various heating sources in the prior art, Pantograph-OCS system is integrated
The problem of thermal field is analyzed.
In order to achieve the above object of the invention, a kind of the technical solution adopted by the present invention are as follows: synthesis thermal field of Pantograph-OCS system point
Analyse the method for building up of model, comprising the following steps:
S1, Joule heat and frictional heat in Pantograph-OCS system are calculated separately；
S2, temperature rise of the Pantograph-OCS system compared to environment is determined according to Joule heat and frictional heat, calculates the heat dissipation of Pantograph-OCS system；
S3, comprehensive Joule heat, frictional heat and heat dissipation, determine Thermal Synthetic field analysis model when Pantograph-OCS system balance.
Further,
The Joule heat QRCalculation formula are as follows:
QR=I2RCt
Wherein, I is the size of current for flowing through contact surface；
RcFor equivalent contact resistance resistance value；
T is Pantograph-OCS system runing time；
The frictional heat QfCalculation formula are as follows:
Qf=μ fvt
Wherein, μ is normal direction frictional force factor；
F is the normal pressure of contact surface；
V is the speed of related movement of contact surface；
T is Pantograph-OCS system runing time.
Further, the contact resistance RcAre as follows:
Wherein, a, b, c are empirical fit parameter；
ρ is the sum of the resistivity of two contact materials；
H is the material hardness of pantograph pan；
N is average conductive spot number；
FcFor contact pressure；
π is pi；
α is the average specific temperature-coefficient of electrical resistance of contact material；
σ is leaching copper carbon slipper material conducts heat rate；
λ is correction factor；
ξ is the tunnel resistor rate of conductive film.
Further, in the step S2 Pantograph-OCS system heat dissipation Q1Calculation formula are as follows:
Q1=h (Text-T1)
Wherein, h is the coefficient of heat conduction,
TextFor environment temperature；
T1For the temperature on contact surface；
The coefficient of heat conduction h are as follows:
H=0.9140254913*0.000481*1991.445284* (v0)^0.8
Wherein, v0For train running speed；
Temperature T on the contact surface1Are as follows:
T1=(QR+Qf)t/(m1CP1)-273.15
Wherein, m1For the quality of bow net sliding block；
CP1For the specific heat capacity of sliding block.
Further, the Thermal Synthetic field analysis model in the step S3 are as follows:
Tfin1=(QR+Qf+Q1)t/m1CP1-273.15；
Wherein, Tfin1For bow net shoe surface temperature.
The Thermal Synthetic field analysis model of Pantograph-OCS system provided by the invention, realizes frictional heat in Pantograph-OCS system, Joule heat
With the thermal field comprehensive analysis of Thermal Synthetic, high speed bow net wear with current problem is improved, provides section to improve bow net service life
Learn foundation.
Detailed description of the invention
Fig. 1 is the method for building up flow chart of the Thermal Synthetic field analysis model of Pantograph-OCS system in embodiment provided by the invention.
Fig. 2 is bow net heat production basic schematic diagram in embodiment provided by the invention.
Joule heat when Fig. 3 is in embodiment provided by the invention with curent change 300s (stable state).
Fig. 4 is when individually changing a variable in embodiment provided by the invention, to impact to bow net temperature change
Curve graph.
Fig. 5 is when changing simultaneously two variables in embodiment provided by the invention, to impact to bow net temperature change
Schematic diagram.
Specific embodiment
A specific embodiment of the invention is described below, in order to facilitate understanding by those skilled in the art this hair
It is bright, it should be apparent that the present invention is not limited to the ranges of specific embodiment, for those skilled in the art,
As long as various change is in the spirit and scope of the present invention that the attached claims limit and determine, these variations are aobvious and easy
See, all are using the innovation and creation of present inventive concept in the column of protection.
As shown in Figure 1, a kind of method for building up of the Thermal Synthetic field analysis model of Pantograph-OCS system, comprising the following steps:
S1, Joule heat and frictional heat in Pantograph-OCS system are calculated separately；
According to theory analysis and experiment, as shown in Fig. 2, the heat that bow net is generated in continuous service is mainly from two sides
Face: Joule heat and frictional heat, after bow net starting, heat production can not add up always, but due to factors such as air and heat dissipations
Bow net is set integrally to reach thermal equilibrium state, system tends towards stability.
The main reason for Joule heat is as Pantograph-OCS system heat production, size of current and contact resistance by contact surface are to establish
The important parameter of joule thermal mathematic model, Joule heat QRCalculation formula are as follows:
QR=I2RCt
Wherein, I is the size of current for flowing through contact surface；
RcFor equivalent contact resistance resistance value；
T is Pantograph-OCS system runing time；
Contact resistance is related with the inner parameters such as bow net contact face resistivity of material, frictional force factor simultaneously, also with contact
The external parameters such as speed of related movement are related between surface pressure, contact surface, and in different operating, Holm model point can be used
Analyse contact resistance size；However as the further investigation of contact resistance, point contact subject circle proposes conductive spot and skin covering of the surface
Theory, therefore, using bow net contact resistance calculations model more perfect so far, contact resistance RcAre as follows:
Wherein, a, b, c are empirical fit parameter；
ρ is the sum of the resistivity of two contact materials；
H is the material hardness of pantograph pan；
N is average conductive spot number；
FcFor contact pressure；
π is pi；
α is the average specific temperature-coefficient of electrical resistance of contact material；
σ is leaching copper carbon slipper material conducts heat rate；
λ is correction factor；
ξ is the tunnel resistor rate of conductive film.
By above-mentioned calculation formula as it can be seen that considering the variation of electric current, speed and contact pressure simultaneously, speed, electric current, contact force
Deng being all the factor for influencing contact resistance.By studying influence of these three factors to bow net contact resistance, train is then introduced
The computation model of the speed of service and the relationship of average contact pressure amendment contact resistance.According to experiment it is found that contact resistance is with vehicle
Speed increase and increase, reduce with the increase of electric current, and electric current is smaller, the variation of contact resistance is more sensitive.The above analysis is equal
Based on not considering what the rough characteristic of contact pressure carried out, after speed determines, contact pressure is a constant steady state value.
When actually calculating the Joule heat of Pantograph-OCS system, calculated contact resistance is introduced into vehicle net electrical model, is ground
Study carefully contact resistance and takes stream and net to survey the influence of voltage in supply conductor voltage, electric current and locomotive.Bow net contact pressure is not considered first
Rough characteristic, calculate the Static Contact resistance under different speeds and contact pressure, study different bow net Static Contact electricity
Hinder the influence to vehicle net electrical characteristic.Know that contact surface current, voltage and locomotive take stream and locomotive voltage on line side by different contacts
The influence of pressure is less obvious, and regularity is not strong.
Frictional heat is produced from bow net contact face heat caused by relative motion under a certain pressure, in practical Pantograph-OCS system
The pressure and non-constant value of contact surface, transformation is non-linear and time-varying, and in train stable operation, transformation amplitude is not
Greatly, when studying its heat production, the case where being idealized as constant pressure.Therefore frictional heat QfCalculation formula are as follows:
Qf=μ fvt
Wherein, μ is normal direction frictional force factor；
F is the normal pressure of contact surface；
V is the speed of related movement of contact surface；
T is Pantograph-OCS system runing time.
S2, temperature rise of the Pantograph-OCS system compared to environment is determined according to Joule heat and frictional heat, calculates the heat dissipation of Pantograph-OCS system；
Pantograph-OCS system in actual operation, contact surface temperature can not because the presence of Joule heat and frictional heat and always
It is cumulative, so Pantograph-OCS system makes Pantograph-OCS system keep thermal balance in the presence of heat dissipation in actual operation；
Therefore, in above-mentioned steps S2 Pantograph-OCS system heat dissipation Q1Calculation formula are as follows:
Q1=h (Text-T1)
Wherein, h is the coefficient of heat conduction,
TextFor environment temperature；
T1For the temperature on contact surface；
The value of the coefficient of heat conduction is related with train running speed, available after simplifying in conjunction with practical bow net model
Above-mentioned coefficient of heat conduction h are as follows:
H=0.9140254913*0.000481*1991.445284* (v0)^0.8
Wherein, v0For train running speed；
Temperature T on the contact surface1Are as follows:
T1=(QR+Qf)t/(m1CP1)-273.15
Wherein, m1For the quality of bow net sliding block；
CP1For the specific heat capacity of sliding block.
S3, according to Joule heat, frictional heat and heat dissipation, determine Thermal Synthetic field analysis model when Pantograph-OCS system balance.
Comprehensive Joule heat, frictional heat and heat dissipation, obtain that the synthesis thermal field that shoe surface temperature changes over time can be analyzed
Analysis model are as follows:
Tfin1=(QR+Qf+Q1)t/m1CP1-273.15
Wherein, Tfin1For bow net shoe surface temperature.
It is possible thereby to calculate in Pantograph-OCS system runing time, the case where temperature changes over time (Analysis of Transient Thermal Field) and steady
State value (stable state temperature rise).
In one embodiment of the invention, the emulation using the method for the present invention to the synthesis thermal field of Pantograph-OCS system is provided
Analytic process: each material parameter used in the present embodiment is as shown in table 1:
Table 1: material parameter
When the Joule heat for carrying out Pantograph-OCS system calculates, using metal-impregnated carbon slide and CT150 type copper contact wire as ginseng
Exponential model carries out emulation experiment.The initial setting up of simulation parameter is as follows: the potential between bow net is 25KV；Pantograph pan and contact
Initial temperature between line is identical as environment temperature, is set as 20 DEG C；Initial Voltage Value is 0V；When the normal direction contact pressure between bow net
When for 90N, electric current 400A, speed of related movement 200kmh-1, slidably reciprocate on the contact surface in the contact line of bow net
In the process, when sliding into the half of 1950mm, its Joule heat is as shown in Figure 3.
From figure 3, it can be seen that pantograph pan and contact line be during opposite sliding, when contact pressure is 60N
When, under the different speeds of service, when simulation time is 300 seconds, i.e. Pantograph-OCS system operation reaches certain stable state, with current parameters
Change, the variation of Joule heat caused by model is in the trend constantly risen.
In order to verify influence of the different affecting factors to Pantograph-OCS system Thermal Synthetic field analysis process, if Fig. 4-Fig. 5 is difference
The emulation data of variable independent change；(a), (b) be respectively under different pressures and different electric currents contact surface temperature change over time
Rule (c) changes over time rule for contact surface temperature under friction speed.It is clear that pressure, electric current increase, can make
Steady temperature value rises, and speed increase can be such that temperature reduces instead.Because the processes such as speed and contact resistance and heat dissipation are mutual
It influences, changing rule is not linear.Three variables can interact.This illustrates that Pantograph-OCS system in actual motion, becomes
Change will not be monotonically changed with unitary variant.Therefore, as shown in figure 5, can probe into and verify by changing simultaneously two variables
The correctness of bow net model.
In 3 width figures shown in Fig. 5, (a), (b) are respectively that contact surface temperature is at any time under uniform pressure and same current
Changing rule (c) changes over time rule for contact surface temperature under identical speed, it can be seen that the actual moving process of bow net
In, actual operational process may be walked along any one curve on curved surface, and contact surface temperature is at any time under same current
Between in the curve that changes, can be with it is clear to see that with pressure change, temperature not instead of monotone increasing, at one certain
There are a minimum values under pressure.It can be seen in the drawing that change rate is higher and higher as electric current increases, that is to say, that
In electric current when within 230A, rate of temperature change is smaller, and temperature rise is smaller.After electric current reaches 230A or more, temperature rise is quick
It improves.In practical applications, it can be analyzed under what circumstances, temperature rise etc. reaches minimum value, and moves by the model
Process control is in optimal range.
The Thermal Synthetic field analysis model of Pantograph-OCS system provided by the invention, realizes frictional heat in Pantograph-OCS system, Joule heat
With the thermal field comprehensive analysis of Thermal Synthetic, high speed bow net wear with current problem is improved, provides section to improve bow net service life
Learn foundation.
Claims (5)
1. a kind of method for building up of the Thermal Synthetic field analysis model of Pantograph-OCS system, which comprises the following steps:
S1, Joule heat and frictional heat in Pantograph-OCS system are calculated separately；
S2, temperature rise of the Pantograph-OCS system compared to environment is determined according to Joule heat and frictional heat, and then calculate the heat dissipation of Pantograph-OCS system；
S3, comprehensive Joule heat, frictional heat and heat dissipation, determine Thermal Synthetic field analysis mould when Pantograph-OCS system heat production and heat dissipation balancing
Type.
2. the method for building up of the Thermal Synthetic field analysis model of Pantograph-OCS system according to claim 1, which is characterized in that
The Joule heat QRCalculation formula are as follows:
QR=I2RCt
Wherein, I is the size of current for flowing through contact surface；
RcFor equivalent contact resistance resistance value；
T is Pantograph-OCS system runing time；
The frictional heat QfCalculation formula are as follows:
Qf=μ fvt
Wherein, μ is normal direction frictional force factor；
F is the normal pressure of contact surface；
V is the speed of related movement of contact surface；
T is Pantograph-OCS system runing time.
3. the method for building up of the Thermal Synthetic field analysis model of Pantograph-OCS system according to claim 2, which is characterized in that described
Contact resistance RcAre as follows:
Wherein, a, b, c are empirical fit parameter；
ρ is the sum of the resistivity of two contact materials；
H is the material hardness of pantograph pan；
N is average conductive spot number；
FcFor contact pressure；
π is pi；
α is the average specific temperature-coefficient of electrical resistance of contact material；
σ is leaching copper carbon slipper material conducts heat rate；
λ is correction factor；
ξ is the tunnel resistor rate of conductive film.
4. the method for building up of the Thermal Synthetic field analysis model of Pantograph-OCS system according to claim 3, which is characterized in that described
The heat dissipation Q of Pantograph-OCS system in step S21Calculation formula are as follows:
Q1=h (Text-T1)
Wherein, h is the coefficient of heat conduction,
TextFor environment temperature；
T1For the temperature on contact surface；
The coefficient of heat conduction h are as follows:
H=0.9140254913*0.000481*1991.445284* (v0)^0.8
Wherein, v0For train running speed；
Temperature T on the contact surface1Are as follows:
T1=(QR+Qf)t/(m1CP1)-273.15
Wherein, m1For the quality of bow net sliding block；
CP1For the specific heat capacity of sliding block.
5. the method for building up of the Thermal Synthetic field analysis model of Pantograph-OCS system according to claim 4, which is characterized in that described
Thermal Synthetic field analysis model in step S3 are as follows:
Tfin1=(QR+Qf+Q1)t/m1CP1-273.15
Wherein, Tfin1For bow net shoe surface temperature.
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| US20160041112A1 (en) * | 2013-08-13 | 2016-02-11 | Everfine Photo-E-Info Co.,Ltd. | Method for analysis of thermal resistance |
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2018
- 2018-10-16 CN CN201811203909.1A patent/CN109446609B/en active Active
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| US20160041112A1 (en) * | 2013-08-13 | 2016-02-11 | Everfine Photo-E-Info Co.,Ltd. | Method for analysis of thermal resistance |
| CN104200034A (en) * | 2014-09-10 | 2014-12-10 | 清华大学 | Dry sliding friction-heat-stress-abrasion sequential coupling simulation method |
| CN104361196A (en) * | 2014-09-22 | 2015-02-18 | 西南交通大学 | Arc net off-line electric arc mathematical model for calculating train speed |
| CN106528957A (en) * | 2016-10-19 | 2017-03-22 | 上海市特种设备监督检验技术研究院 | Thermal-mechanical coupling analysis method for progressive safety gear of elevator |
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