CN104596779A - Testing method for tractive characteristics and electric braking characteristics of motor train unit - Google Patents
Testing method for tractive characteristics and electric braking characteristics of motor train unit Download PDFInfo
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- CN104596779A CN104596779A CN201510036786.7A CN201510036786A CN104596779A CN 104596779 A CN104596779 A CN 104596779A CN 201510036786 A CN201510036786 A CN 201510036786A CN 104596779 A CN104596779 A CN 104596779A
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Abstract
The invention provides a testing method for the tractive characteristics and electric braking characteristics of a motor train unit. The method comprises the following steps: step 1: preparing before testing; step 2: obtaining the traction force at wheel rim and electric braking force at wheel rim of a motor train unit in a non-constant power area by using the acceleration/deceleration of the motor train unit, and using the power of the motor train unit to obtain the electric braking force at wheel rim and the traction force at wheel rim of the motor train unit in a constant power area. According to the testing method provided by the invention, through the simple physical quantity, the traction force at wheel rim and electric braking force at wheel rim of the motor train unit can be calculated by acceleration/deceleration and the electric power of the motor train unit. The testing method is less in testing quantity, more convenient to calculate and high in feasibility, and the embodiment of the tractive characteristics/electric braking characteristics of the motor train unit at different stages by the acceleration/deceleration and the electric power of the motor train unit can be accurate and persuasive.
Description
Technical field
The present invention relates to locomotive field, specifically the method for testing of a kind of motor train unit pulling figure and electric braking characteristic.
Background technology
The standard of each current type electric EMU type approval test reference is " IEC 61133 (C)-2006 rail facilities-rolling stock-vehicle assembling and the complete vehicle test before running ".Along with the development of China Express Railway, there is various types of electric EMU to dispatch from the factory every year, along with the manufacture of novel electric vehicle group, need to carry out more complete vehicle tests.But in " IEC61133 (C)-2006 rail facilities-rolling stock-vehicle assembling and the complete vehicle test before running ", clear and definite regulation be there is no to the type approval test method of pulling figure and electric braking characteristic, only this object tested and testing requirements are illustrated and are specified, make current method of testing chaotic, a lot of method does not have cogency, does not have corresponding theory support.In addition, trailer system is one of kernel subsystems of EMU, and mainly realize the functions such as motor train unit traction, electric braking, its performance directly determines runnability and the quality of EMU.Further, the rational and efficient use of motor train unit electric braking, can greatly reduce the wearing and tearing of Pneumatic brake systems mechanical part, reduces motor train unit operation cost.Therefore, to the examination of motor train unit electric braking performance, be an important content of motor train unit car load type approval test.
Therefore, work out the type approval test method of electric EMU electric braking, improve China and just become problem demanding prompt solution in the level of electric EMU type approval test.
Summary of the invention
The problem of motor train unit pulling figure and electric braking characteristic is not suitable for testing in order to solve prior art, the invention provides the method for testing of a kind of motor train unit pulling figure and electric braking characteristic, this method of testing, by measuring simple physical quantity, utilizes acceleration and motor train unit electric power to calculate motor train unit pulling figure/electric braking characteristic.Measuring amount is few, and calculate easy, feasibility is high, and both accurately also has cogency by the pulling figure/electric braking characteristic embodying different stage electric EMU by plus/minus speed and motor train unit electric power two amounts.
The technical solution adopted for the present invention to solve the technical problems is: the method for testing of a kind of motor train unit pulling figure and electric braking characteristic, is characterized in that, the method for testing of described motor train unit pulling figure and electric braking characteristic comprises the following steps:
Step 1: the preparation before test;
Step 2: utilize the retarded velocity of motor train unit to obtain the wheel week electric braking power of this motor train unit in non-constant power area, utilize the acceleration of motor train unit to obtain the tractive effort at wheel rim of this motor train unit in non-constant power area, utilize the power of this motor train unit to obtain all electric braking power of the wheel of this motor train unit in constant power area and tractive effort at wheel rim.
In step 2, obtain the wheel week electric braking power of this motor train unit in non-constant power area to comprise the following steps:
Step 2.1a: the instantaneous retarded velocity calculating this motor train unit,
The computing formula of this instantaneous retarded velocity is
A is instantaneous retarded velocity, and unit is m/s
2; v
2for this motor train unit is in the travelling speed in the first moment, unit is km/h; v
1for this motor train unit is in the travelling speed in the second moment, unit is km/h; v
2>v
1; Δ t is that this motor train unit is from v
2decelerate to v
1time used, unit is s;
Step 2.2a: the decelerative force obtaining this motor train unit according to this instantaneous acceleration,
The computing formula of the decelerative force of this motor train unit is F
j=(1+ γ) × m × a,
F
jfor the decelerative force of this motor train unit, unit is kN; M is the staffing quality of this motor train unit, and unit is t; γ is the rotary mass coefficient of this motor train unit, without unit;
Step 2.3a: the wheel week electric braking power calculating this motor train unit,
The computing formula of all electric braking power of wheel of this motor train unit is: B
e=F
j-m × 9.81 × w'
0× 10
-3,
B
efor this takes turns all electric braking power, unit is kN; M is the staffing quality of this motor train unit, and unit is t; W'
0for datum drag, unit is N/kN.
In step 2, obtain the wheel week electric braking power of this motor train unit in constant power area to comprise the following steps:
Step 2.1b: the wheel week electric braking power calculating this motor train unit,
This computing formula of taking turns all electric braking power is:
B
efor this takes turns all electric braking power, unit is kN; N is the total number of units of traction electric machine of this motor train unit, without unit; P
ifor i-th traction electric machine input active power of this motor train unit, unit is kW; η
melectric efficiency corresponding when speed for this motor train unit is v, without unit; η
gfor the machinery driving efficiency of this motor train unit, without unit; V is the instantaneous velocity of this motor train unit when testing, and unit is km/h;
Described traction electric machine input active power is that three-phase input active power is added;
When the electric braking characteristic of this motor train unit relevant from wheel footpath and when testing wheel diameter and assessment take turns footpath different time, obtain all electric braking power of the wheel of this motor train unit in constant power area further comprising the steps of:
Step 2.2b: to this take turns all electric braking power carry out wheel footpath conversion, now this takes turns all electric braking power is that all electric braking power is taken turns in half abrasion,
The computing formula of all electric braking power of half abrasion wheel of this motor train unit is: B
eB=B
e× D/D
b;
B
eBbe that all electric braking forces are taken turns in half abrasion, unit is kN; D is actual measurement wheel footpath during test, and unit is mm; D
bbe half abrasion wheel wheel footpath, unit is mm;
The computing formula of half abrasion wheel speed is: v
b=v × D
b/ D;
V
bbe half abrasion wheel speed, unit is km/h.
In step 2, obtain this motor train unit to comprise the following steps at the tractive effort at wheel rim of non-constant power area:
Step 2.1c: the instantaneous acceleration calculating this motor train unit,
The computing formula of this instantaneous acceleration is
A is instantaneous acceleration, and unit is m/s
2; v
2for this motor train unit is in the travelling speed in the first moment, unit is km/h; v
1for this motor train unit is in the travelling speed in the second moment, unit is km/h; v
2>v
1; Δ t is that this motor train unit is from v
1accelerate to v
2time used, unit is s;
Step 2.2c: the accelerating force obtaining this motor train unit according to this instantaneous acceleration,
The computing formula of the accelerating force of this motor train unit is F
j=(1+ γ) × m × a;
F
jfor the accelerating force of this motor train unit, unit is kN; M is the staffing quality of this motor train unit, and unit is t; γ is the rotary mass coefficient of this motor train unit;
Step 2.3c: the tractive effort at wheel rim calculating this motor train unit,
The computing formula of the tractive effort at wheel rim of this motor train unit is: F=F
j+ W
0',
F is tractive effort at wheel rim, and unit is kN; W
0' for running datum drag, unit is kN.
In step 2, obtain this motor train unit to comprise the following steps at the tractive effort at wheel rim of constant power area:
Step 2.1d: the single-phase input active power of traction electric machine calculating this motor train unit,
The computing formula of the single-phase input active power of this traction electric machine is:
P
xfor the single-phase input active power of this traction electric machine, unit is kW; T is effective value computation period, and unit is s; u
xt () is phase voltage instantaneous value, unit is V; i
xt () is phase current instantaneous value, unit is A; X is the phase of traction electric machine in u, v, w phase;
Traction electric machine input active power is that three-phase input active power is added;
Step 2.2d: calculate tractive effort at wheel rim,
The computing formula of this tractive effort at wheel rim is:
N is the total number of units of traction electric machine, without unit; N is the total number of units of tested traction electric machine, without unit; P
ibe the input active power of i-th traction electric machine, unit is kW; η
mfor traction electric machine efficiency, without unit; η
gfor the machinery driving efficiency of this motor train unit, without unit; Instantaneous velocity when v is the test of this motor train unit, unit is km/h;
When this motor train unit pulling figure from wheel footpath about and when testing wheel diameter and assessment take turns footpath different time, obtain this motor train unit further comprising the steps of at the tractive effort at wheel rim of constant power area:
Step 2.3d: carry out the conversion of wheel footpath to this tractive effort at wheel rim, now this tractive effort at wheel rim is half abrasion tractive effort at wheel rim,
Should half computing formula wearing away tractive effort at wheel rim be: F
b=F × D/D
b
F
bbe half abrasion tractive effort at wheel rim, unit is kN; D is actual measurement wheel footpath during test, and unit is mm; D
bbe half abrasion wheel wheel footpath, unit is mm;
The computing formula of half abrasion wheel speed is: v
b=v × D
b/ D;
V
bbe half abrasion wheel speed, unit is km/h.
The invention has the beneficial effects as follows, this method of testing is crossed and is measured simple physical quantity, utilizes acceleration and motor train unit electric power to calculate motor train unit pulling figure/electric braking characteristic.Measuring amount is few, and calculate easy, feasibility is high, and both accurately also has cogency by the electric braking characteristic embodying different stage electric EMU by retarded velocity and motor train unit electric power two amounts.
In addition, method of testing of the present invention is adopted to test existing motor train unit respectively, thus obtain actual measurement pulling figure and electric braking performance data, after being delivered to the transportation by railroad department of China by the motor train unit (quality of motor train unit meets China's relevant criterion) of test, through the actual motion of 1 year, human pilot compares according to the daily performance of this motor train unit and measured data, thinks that method of testing of the present invention can react motor train unit car group pulling figure and electric braking characteristic substantially preferably.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.The present invention is described in detail below with reference to embodiment.
A method of testing for motor train unit pulling figure and electric braking characteristic, comprises the following steps:
Step 1: the preparation before test;
Step 2: utilize the retarded velocity of motor train unit to obtain all electric braking power of the wheel of this motor train unit in non-constant power area and tractive effort at wheel rim, utilize the acceleration of motor train unit to obtain the tractive effort at wheel rim of this motor train unit in non-constant power area, utilize the power of this motor train unit to obtain all electric braking power of the wheel of this motor train unit in constant power area and tractive effort at wheel rim.
Concrete, non-invariable power district adopts acceleration method (corresponding traction)/Deceleration way (corresponding electric braking), and invariable power district adopts electric power method.When power distribute type motor train unit traction electric machine quantity is more, available some motors of choosing carry out testing (being no less than 50% of motor sum under single pantograph), and all the other powers of motor play to be thought with suitable by measured motor average level.
Step 1: the preparation before test comprises following content:
Data encasement before 1.1 calculating:
Obtain tested motor train unit traction electric machine, gear case efficiency, the running resistance computing formula of tested motor train unit,
There is provided tested motor train unit experiment of weighing result, motor train unit rotary mass coefficient.
1.2 pacing itemss:
Before motor train unit submits test to, should be in normal condition, motor train unit load is staffing load.
When adopting retardation method test, ambient wind velocity need be less than 3.3m/s, tests and carries out on level tangent track, and rail level adhesion condition is good.
Net pressure should be able to meet the requirement that motor train unit full power plays.
Then the data needed for test are obtained by following method of operating:
The method of operating (all electric braking power of the wheel for measuring non-constant power area and tractive effort at wheel rim) of motor-car acceleration method test:
Select the straight road of a section or several sections longer to test, multiple velocity shooting can be divided to test respectively according to straight road length, to ensure in whole velocity shooting motor train unit all on straight road and traction handle remains on the full level of traction.
Traction working condition electric power method method of operating (all electric braking power of the wheel for measuring constant power area and tractive effort at wheel rim):
After motor train unit arrives test site with fixing speed, traction handle is pushed into the full level of traction, starts to record motor train unit speed and traction electric machine electrical quantity.
In addition, the method of operating of motor train unit electric braking test (Deceleration way and electric power method complete in single test): should predetermined speed be reached before motor train unit enters test section, after entering test section, motor train unit applies maximum electric braking, slows down until predetermined speed.During test, motor train unit should be in maximum electric braking operating mode, and during Deceleration way test, motor train unit must not apply air damping, but should guarantee that air brake hard can apply fast.
After measuring the basic data obtained needed for test, obtain motor train unit pulling figure and electric braking characteristic by following computation process.The wheel week electric braking power and tractive effort at wheel rim of this motor train unit in non-constant power area will be drawn below with the actual measurement data of motor train unit, and the wheel week electric braking power and tractive effort at wheel rim in constant power area.
In step 2, obtain the wheel week electric braking power of this motor train unit in non-constant power area to comprise the following steps:
Step 2.1a: the instantaneous acceleration calculating this motor train unit,
The computing formula of this instantaneous acceleration is
A is instantaneous acceleration, and unit is m/s
2; v
2for this motor train unit is in the travelling speed in the first moment, unit is km/h; v
1for this motor train unit is in the travelling speed in the second moment, unit is km/h; v
2>v
1; Δ t is that this motor train unit is from v
2decelerate to v
1time used, unit is s;
As v
2for 90.3km/h; v
1for 89.6km/h; Δ t is 0.5s; Finally obtaining a is 0.39m/s
2,
Step 2.2a: the decelerative force obtaining this motor train unit (90.0km/h is obtained by (90.3+89.6)/2) at such speeds according to this instantaneous acceleration,
The computing formula of the decelerative force of this motor train unit is F
j=(1+ γ) × m × a,
F
jfor the decelerative force of this motor train unit, unit is kN; M is the staffing quality of this motor train unit, and unit is t; γ is the rotary mass coefficient of this motor train unit, without unit; γ is motor train unit design parameter, and general basis " traction calculates code " is decided to be 0.06.
If m is 469.4t; γ is 0.06; The F of motor train unit when 90.0km/h
jfor 194.0kN
Step 2.3a: the wheel week electric braking power calculating this motor train unit,
The computing formula of all electric braking power of wheel of this motor train unit is: B
e=F
j-m × 9.81 × w'
0× 10
-3,
B
efor this takes turns all electric braking power, unit is kN; M is the staffing quality of this motor train unit, and unit is t; W'
0for datum drag, unit is N/kN.
Datum drag generally adopts the method for putting of sauntering to measure, and during test, tested motor train unit should reach predetermined speed before entering sampling section; Disconnected main circuit breaker coasting after entering sampling section, continuously record coasting speed and corresponding time parameter.According to deceleration calculation motor train unit idle running resistance, it is generally acknowledged that this resistance is motor train unit datum drag.
As w'
0be 2.0N/kN when speed is 90.0km/h; B
efor 184.3kN.
In step 2, obtain the wheel week electric braking power of this motor train unit in constant power area to comprise the following steps:
Step 2.1b: the wheel week electric braking power calculating this motor train unit,
This computing formula of taking turns all electric braking power is:
B
efor this takes turns all electric braking power, unit is kN; N is the total number of units of traction electric machine of this motor train unit, without unit; P
ifor i-th traction electric machine input active power of this motor train unit, unit is kW; η
melectric efficiency corresponding when speed for this motor train unit is v, without unit; η
gfor the machinery driving efficiency of this motor train unit, without unit; V is the instantaneous velocity of this motor train unit when testing, and unit is km/h;
Electric efficiency and machinery driving efficiency are generally obtained by test after dispatching from the factory at motor train unit traction electric machine and gear case.
Described traction electric machine input active power is that three-phase input active power is added;
As recorded motor train unit when 245km/h,
for 6272kW, η
mbe 0.94, η
gbe 0.975; B
efor 100.6kN.
When the electric braking characteristic of this motor train unit relevant from wheel footpath and when testing wheel diameter and assessment take turns footpath different time, obtain all electric braking power of the wheel of this motor train unit in constant power area further comprising the steps of:
Step 2.2b: to this take turns all electric braking power carry out wheel footpath conversion, now this takes turns all electric braking power is that all electric braking power is taken turns in half abrasion,
The computing formula of all electric braking power of half abrasion wheel of this motor train unit is: B
eB=B
e× D/D
b;
B
eBbe that all electric braking forces are taken turns in half abrasion, unit is kN; D is actual measurement wheel footpath during test, and unit is mm; D
bbe half abrasion wheel wheel footpath, unit is mm; D
bfor design parameter, motor train unit will determine new wheel wheel footpath, half abrasion wheel footpath when designing.
The computing formula of half abrasion wheel speed is: v
b=v × D
b/ D
V
bbe half abrasion wheel speed, unit is km/h.
As according to above-mentioned calculating, B during 90.0km/h
efor 184.3kN, D during motor train unit design
bfor 850mm, measuring test hour wheel footpath D is 878.7mm, B
eBfor 190.5kN, v
bfor 87.1km/h.
In step 2, obtain this motor train unit to comprise the following steps at the tractive effort at wheel rim of non-constant power area:
Step 2.1c: the instantaneous acceleration calculating this motor train unit,
The computing formula of this instantaneous acceleration is
A is instantaneous acceleration, and unit is m/s
2; v
2for this motor train unit is in the travelling speed in the first moment, unit is km/h; v
1for this motor train unit is in the travelling speed in the second moment, unit is km/h; v
2>v
1; Δ t is that this motor train unit is from v
1accelerate to v
2time used, unit is s;
As v
2for 91.3km/h; v
1for 90.5km/h; Δ t is 0.5s; Finally obtaining a is 0.44m/s
2;
Step 2.2c: the accelerating force obtaining this motor train unit (90.9km/h is obtained by (91.3+90.5)/2) at such speeds according to this instantaneous acceleration,
The computing formula of the accelerating force of this motor train unit is F
j=(1+ γ) × m × a
F
jfor the accelerating force of this motor train unit, unit is kN; M is the staffing quality of this motor train unit, and unit is t; γ is the rotary mass coefficient of this motor train unit;
If m is 469.4t; γ is 0.06; The F of motor train unit when 90.9km/h
jfor 218.9kN;
Step 2.3c: the tractive effort at wheel rim calculating this motor train unit,
The computing formula of the tractive effort at wheel rim of this motor train unit is: F=F
j+ W
0',
F is tractive effort at wheel rim, and unit is kN; W
0' for running datum drag, unit is kN; W
0' adopt the above-mentioned method of putting of sauntering to measure.
As w'
0be 2.1N/kN when speed is 90.9km/h; F is 228.7kN.
In step 2, obtain this motor train unit to comprise the following steps at the tractive effort at wheel rim of constant power area:
Step 2.1d: the single-phase input active power of traction electric machine calculating this motor train unit,
The computing formula of the single-phase input active power of this traction electric machine is:
P
xfor the single-phase input active power of this traction electric machine, unit is kW; T is effective value computation period, and unit is s; u
xt () is phase voltage instantaneous value, unit is V; i
xt () is phase current instantaneous value, unit is A; X is the phase of traction electric machine in u, v, w phase;
Traction electric machine input active power is that three-phase input active power is added, i.e. Pi=Pu+Pv+Pw;
Step 2.2d: calculate tractive effort at wheel rim,
The computing formula of this tractive effort at wheel rim is:
N is the total number of units of traction electric machine, without unit; N is the total number of units of tested traction electric machine, without unit; P
ibe the input active power of i-th traction electric machine, unit is kW; η
mfor traction electric machine efficiency, without unit; η
gfor the machinery driving efficiency of this motor train unit, without unit; Instantaneous velocity when v is the test of this motor train unit, unit is km/h;
As recorded motor train unit when 245km/h, recording car load power input to machine is 6007kW, η
mbe 0.94, η
gbe 0.975; F is 80.9kN.
When this motor train unit pulling figure from wheel footpath about and when testing wheel diameter and assessment take turns footpath different time, obtain this motor train unit further comprising the steps of at the tractive effort at wheel rim of constant power area:
Step 2.3d: carry out the conversion of wheel footpath to this tractive effort at wheel rim, now this tractive effort at wheel rim is half abrasion tractive effort at wheel rim,
Should half computing formula wearing away tractive effort at wheel rim be: F
b=F × D/D
b
F
bbe half abrasion tractive effort at wheel rim, unit is kN; D is actual measurement wheel footpath during test, and unit is mm; D
bbe half abrasion wheel wheel footpath, unit is mm.
The computing formula of half abrasion wheel speed is: v
b=v × D
b/ D
V
bbe half abrasion wheel speed, unit is km/h.
As according to above-mentioned calculating, during 90.9km/h, F is 228.7kN, D during motor train unit design
bfor 850mm, measuring test hour wheel footpath D is 878.7mm, F
bfor 236.4kN, v
bfor 87.9km/h.
In addition, method of testing of the present invention is adopted to test existing motor train unit respectively, thus obtain actual measurement pulling figure and electric braking performance data, after being delivered to the transportation by railroad department of China by the motor train unit (quality of motor train unit meets China's relevant criterion) of test, through the actual motion of 1 year, human pilot compares according to the daily performance of this motor train unit and measured data, thinks that method of testing of the present invention can react motor train unit car group pulling figure and electric braking characteristic substantially preferably.
The above, be only specific embodiments of the invention, can not limit the scope that invention implements with it, so the displacement of its equivalent assemblies, or the equivalent variations done according to scope of patent protection of the present invention and modification, all still should belong to the category that this patent is contained.In addition, the technical characteristic in the present invention and all can using by independent assortment between technical characteristic, between technical characteristic and technical scheme, between technical scheme and technical scheme.
Claims (5)
1. a method of testing for motor train unit pulling figure and electric braking characteristic, is characterized in that, the method for testing of described motor train unit pulling figure and electric braking characteristic comprises the following steps:
Step 1: the preparation before test;
Step 2: utilize the retarded velocity of motor train unit to obtain the wheel week electric braking power of this motor train unit in non-constant power area, utilize the acceleration of motor train unit to obtain the tractive effort at wheel rim of this motor train unit in non-constant power area, utilize the power of this motor train unit to obtain all electric braking power of the wheel of this motor train unit in constant power area and tractive effort at wheel rim.
2. the method for testing of motor train unit pulling figure according to claim 1 and electric braking characteristic, is characterized in that, in step 2, obtains the wheel week electric braking power of this motor train unit in non-constant power area and comprises the following steps:
Step 2.1a: the instantaneous retarded velocity calculating this motor train unit,
The computing formula of this instantaneous retarded velocity is
A is instantaneous retarded velocity, and unit is m/s
2; v
2for this motor train unit is in the travelling speed in the first moment, unit is km/h; v
1for this motor train unit is in the travelling speed in the second moment, unit is km/h; v
2> v
1; Δ t is that this motor train unit is from v
2decelerate to v
1time used, unit is s;
Step 2.2a: the decelerative force obtaining this motor train unit according to this instantaneous acceleration,
The computing formula of the decelerative force of this motor train unit is F
j=(1+ γ) × m × a;
F
jfor the decelerative force of this motor train unit, unit is kN; M is the staffing quality of this motor train unit, and unit is t; γ is the rotary mass coefficient of this motor train unit, without unit;
Step 2.3a: the wheel week electric braking power calculating this motor train unit,
The computing formula of all electric braking power of wheel of this motor train unit is: B
e=F
j-m × 9.81 × w '
0× 10
-3;
B
efor this takes turns all electric braking power, unit is kN; M is the staffing quality of this motor train unit, and unit is t; W '
0for datum drag, unit is N/kN.
3. the method for testing of motor train unit pulling figure according to claim 1 and electric braking characteristic, is characterized in that, in step 2, obtains the wheel week electric braking power of this motor train unit in constant power area and comprises the following steps:
Step 2.1b: the wheel week electric braking power calculating this motor train unit,
This computing formula of taking turns all electric braking power is:
B
efor this takes turns all electric braking power, unit is kN; N is the total number of units of traction electric machine of this motor train unit, without unit; P
ifor i-th traction electric machine input active power of this motor train unit, unit is kW; η
melectric efficiency corresponding when speed for this motor train unit is v, without unit; η
gfor the machinery driving efficiency of this motor train unit, without unit; V is the instantaneous velocity of this motor train unit when testing, and unit is km/h;
Described traction electric machine input active power is that three-phase input active power is added;
When the electric braking characteristic of this motor train unit relevant from wheel footpath and when testing wheel diameter and assessment take turns footpath different time, obtain all electric braking power of the wheel of this motor train unit in constant power area further comprising the steps of:
Step 2.2b: to this take turns all electric braking power carry out wheel footpath conversion, now this takes turns all electric braking power is that all electric braking power is taken turns in half abrasion,
The computing formula of all electric braking power of half abrasion wheel of this motor train unit is: B
eB=B
e× D/D
b;
B
eBbe that all electric braking forces are taken turns in half abrasion, unit is kN; D is actual measurement wheel footpath during test, and unit is mm; D
bbe half abrasion wheel wheel footpath, unit is mm;
The computing formula of half abrasion wheel speed is: v
b=v × D
b/ D;
V
bbe half abrasion wheel speed, unit is km/h.
4. the method for testing of motor train unit pulling figure according to claim 1 and electric braking characteristic, is characterized in that, in step 2, obtains this motor train unit and comprises the following steps at the tractive effort at wheel rim of non-constant power area:
Step 2.1c: the instantaneous acceleration calculating this motor train unit,
The computing formula of this instantaneous acceleration is
A is instantaneous acceleration, and unit is m/s
2; v
2for this motor train unit is in the travelling speed in the first moment, unit is km/h; v
1for this motor train unit is in the travelling speed in the second moment, unit is km/h; v
2> v
1; Δ t is that this motor train unit is from v
1accelerate to v
2time used, unit is s;
Step 2.2c: the accelerating force obtaining this motor train unit according to this instantaneous acceleration,
The computing formula of the accelerating force of this motor train unit is F
j=(1+ γ) × m × a;
F
jfor the accelerating force of this motor train unit, unit is kN; M is the staffing quality of this motor train unit, and unit is t; γ is the rotary mass coefficient of this motor train unit;
Step 2.3c: the tractive effort at wheel rim calculating this motor train unit,
The computing formula of the tractive effort at wheel rim of this motor train unit is: F=F
j+ W '
0;
F is tractive effort at wheel rim, and unit is kN; W '
0for running datum drag, unit is kN.
5. the method for testing of motor train unit pulling figure according to claim 1 and electric braking characteristic, is characterized in that, in step 2, obtains this motor train unit and comprises the following steps at the tractive effort at wheel rim of constant power area:
Step 2.1d: the single-phase input active power of traction electric machine calculating this motor train unit,
The computing formula of the single-phase input active power of this traction electric machine is:
P
xfor the single-phase input active power of this traction electric machine, unit is kW; T is effective value computation period, and unit is s; u
xt () is phase voltage instantaneous value, unit is V; i
xt () is phase current instantaneous value, unit is A; X is the phase of traction electric machine in u, v, w phase;
Traction electric machine input active power is that three-phase input active power is added;
Step 2.2d: calculate tractive effort at wheel rim,
The computing formula of this tractive effort at wheel rim is:
N is the total number of units of traction electric machine, without unit; N is the total number of units of tested traction electric machine, without unit; P
ibe the input active power of i-th traction electric machine, unit is kW; η
mfor traction electric machine efficiency, without unit; η
gfor the machinery driving efficiency of this motor train unit, without unit; Instantaneous velocity when v is the test of this motor train unit, unit is km/h;
When this motor train unit pulling figure from wheel footpath about and when testing wheel diameter and assessment take turns footpath different time, obtain this motor train unit further comprising the steps of at the tractive effort at wheel rim of constant power area:
Step 2.3d: carry out the conversion of wheel footpath to this tractive effort at wheel rim, now this tractive effort at wheel rim is half abrasion tractive effort at wheel rim,
Should half computing formula wearing away tractive effort at wheel rim be: F
b=F × D/D
b;
F
bbe half abrasion tractive effort at wheel rim, unit is kN; D is actual measurement wheel footpath during test, and unit is mm; D
bbe half abrasion wheel wheel footpath, unit is mm;
The computing formula of half abrasion wheel speed is: v
b=v × D
b/ D;
V
bbe half abrasion wheel speed, unit is km/h.
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