CN103630379B - Testing arrangement and the method for a kind of train self mechanical resistance - Google Patents
Testing arrangement and the method for a kind of train self mechanical resistance Download PDFInfo
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Abstract
The present invention relates to testing arrangement and the method for a kind of train self mechanical resistance, comprise instruction carriage, be arranged on rolling rig, data acquisition unit, test bed testing system, the line powering device in laboratory, specifically comprise the steps: to add instruction carriage, allow instruction carriage drive rolling rig synchronous operation by frictional drive; Under synchronism detection friction speed level, instruction carriage input electric power and output mechanical power obtain comprising between vehicle own loss power and wheel track loss power at interior total losses power; Total losses power is converted into total equivalent resistance by calculating; Difference between total equivalent resistance and wheel track resistance is train self mechanical resistance. The present invention is a kind of testing arrangement and method based under laboratory condition, accompany by arrange a set of in laboratory the rolling rig system that studies use, measure the loss power under friction speed level, and then show that unloaded and band carries equivalent resistance and the total equivalent resistance under state, further calculate again wheel track resistance and self mechanical resistance, measuring method and device are simple, and easy operating is measured accurately.<!--1-->
Description
Technical field
The present invention relates to testing arrangement and the method for a kind of train self mechanical resistance, belong to rail vehicle detection technique field.
Background technology
The datum drag of train is that train needs given essential condition parameter in the time that traction is calculated with braking. At present, obtaining of datum drag is all through experimental test conventionally, gathers a large amount of test result matchings and show that empirical equation calculates the mean value of datum drag. But, can be multi-angle to the experimental test of train resistance, developed a kind of system of testing train resistance as example taking Association of American Railroads (AAR) in the experimental centre of transportation (TTC) of Pueblo (Pueblo), one of its most important target is exactly that the electric energy of testing locomotive traction motor under friction speed and gear is inputted the relation between mechanical energy output.
The air drag when datum drag of train can be planned to train operation, wheel track resistance (referring to the resistance between vehicle wheel and testing stand rail wheel), train self mechanical resistance three parts, just can verify its contribution degree to datum drag if can obtain resistance of different nature by test and theory analysis with the Changing Pattern of speed.
Because be to carry out testing experiment in laboratory, so air drag is also a kind of factor that does not need consideration. This shows wheel track resistance and train self mechanical resistance with regard to basic comprising the datum drag of laboratory condition Train self, can obtain laboratory condition Train self datum drag-tensionvelocity curve, contrast train circuit actual measurement datum drag-tensionvelocity curve, separate air drag-rate curve by campaign, and then can analyze the rule that the accounting of resistance of different nature in train drag overall changes with the speed of service, for the research of train basic resistance and the design analysis of train performance have been established solid practical basis.
Summary of the invention
Main purpose of the present invention is to address the above problem and is not enough, provides the one can be under laboratory condition, accurately measures testing arrangement and the method for train self mechanical resistance.
For achieving the above object, technical scheme of the present invention is:
A testing arrangement for train self mechanical resistance, comprising:
Instruction carriage, comprises test car body, tractive transformer, traction convertor, traction electric machine, bogie and experimental wheel pair;
Be arranged on the rolling rig in laboratory, for providing driving force to described instruction carriage, make the speed of described instruction carriage reach corresponding speed grade;
Data acquisition unit, for gathering input voltage and input current, the outputting torsion moment of torsion data of described instruction carriage or rolling rig;
Test bed testing system, is connected with described data acquisition unit, for gathering storing data information, and collected data is carried out to subsequent calculations, to draw self mechanical resistance of train;
Line powering device, is used to described rolling rig and instruction carriage that energy is provided.
Further, described rolling rig comprises at least a set of test system of accompanying, described accompanying examination transformer, accompany examination current transformer, accompanying examination motor, accompany examination gear-box and accompany examination wheel right of accompanying test system to comprise successively to connect, described accompany examination wheel to and the experimental wheel of described instruction carriage between realize synchronous operation by frictional drive, described in accompany examination transformer to be connected with described line powering device.
Further, described in every pair of described experimental wheel of described instruction carriage is a set of to correspondence, accompany test system, accompany described in many covers described in multiple in test system and accompany the run-in synchronism of examination gear-box.
Further, described data acquisition unit comprises torsion torque sensor and voltage-current sensor.
Further, described in described torsion torque sensor is arranged on, accompany examination gear-box and accompany examination wheel between, described in described voltage-current sensor is arranged on, accompany on the examination secondary side of transformer and the primary side of described tractive transformer.
Another technical scheme of the present invention is:
A method of testing for train self mechanical resistance, comprises the steps:
Add instruction carriage, allow instruction carriage drive rolling rig synchronous operation by frictional drive;
Under synchronism detection friction speed level, instruction carriage input electric power and output mechanical power obtain comprising between vehicle own loss power and wheel track loss power at interior total losses power;
Total losses power is converted into total equivalent resistance by calculating;
Difference between total equivalent resistance and wheel track resistance is train self mechanical resistance.
Further, described wheel track resistance draws by following testing procedure;
Allow described rolling rig no-load running, obtain the loss power of rolling rig under friction speed level, be converted into unloaded equivalent Resistance Value by calculating;
Add instruction carriage again, allow described rolling rig run with load, rolling rig drives described instruction carriage operation by frictional drive, obtains the loss power of described rolling rig under friction speed level, is converted into a band year equivalent Resistance Value by calculatings;
Unloaded equivalent resistance and band carry the difference between equivalent resistance, are described wheel track resistance.
Further, in described rolling rig accompanying examination gear-box and accompany examination wheel between torsion torque measuring pilot is set, to calculate output mechanical power, the primary side of tractive transformer and the secondary side of accompanying examination transformer of described rolling rig at described instruction carriage arrange electric current and voltage test point, to calculate input electric power, described loss power is the difference of input electric power and output mechanical power.
Further, the data of test friction speed grade, are when velocity-stabilization is after setting value, carry out N+1 test taking Δ t as interval, obtain N+1 group data.
Further, from minimum speed according to set speed step-length raise speed to maximum speed, then again according to same speed step-length reduction of speed to minimum speed, at least complete one and take turns speed sweep check.
To sum up content, testing arrangement and the method for a kind of train of the present invention self mechanical resistance, compared with prior art, tool has the following advantages:
(1) the present invention is a kind of testing arrangement and method based under laboratory condition, accompany by arrange a set of in laboratory the rolling rig system that studies use, measure the loss power under friction speed level, and then show that unloaded and band carries the equivalent resistance under state, further calculate again self mechanical resistance, measuring method and device are simple, and easy operating is measured accurately.
(2) the experimental test time can be controlled voluntarily, is subject to the impact of natural environment less.
(3) testing arrangement based under laboratory condition, has good reusability and interactivity, and test node device interface adopts modular thinking, and test node is flexible arrangement as required, is not confined to the measurement of train self mechanical resistance.
Brief description of the drawings
Fig. 1 is the structural representation of rolling rig of the present invention in the time of zero load;
Circuit and test point layout drawing when Fig. 2 is rolling rig zero load of the present invention;
Fig. 3 is rolling rig of the present invention structural representation in the time of run with load;
Wheel track relational structure schematic diagram when Fig. 4 is rolling rig run with load of the present invention;
Circuit and test point layout drawing when Fig. 5 is rolling rig girdle tests car operation of the present invention;
Fig. 6 is the structural representation of rolling rig of the present invention in the time that run with load is measured total losses power;
Circuit and test point layout drawing when Fig. 7 is rolling rig run with load measurement total losses power of the present invention.
As shown in Figures 1 to 7, rolling rig 1, instruction carriage 2, reaction rack equipment 3,4, line powering device 5, test car body 6, accompany examination transformer 7, accompany examination current transformer 8, accompany examination motor 9, accompany examination gear-box 10, accompany examination wheel to 11, torsion torque sensor 12, voltage-current sensor 13, experimental wheel is to 14, tractive transformer 15.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail:
As shown in Figures 1 to 7, the testing arrangement of a kind of train self mechanical resistance of the present invention, be a kind of testing arrangement based under laboratory condition, comprise and be arranged on the rolling rig 1 on ground, laboratory, instruction carriage 2, reaction rack equipment 3, test bed testing system 4, line powering device 5 and data acquisition unit as measurand.
Wherein, rolling rig 1 is mainly used in providing driving force to instruction carriage 2, makes the speed of instruction carriage 2 reach corresponding speed grade.
Rolling rig 1 comprises that many covers accompany test system, every cover to accompany test system to comprise to accompany examination transformer 7, accompany examination current transformer 8, accompany examination motor 9, accompany examination gear-box 10 and accompany examination wheel to 11 etc. Accompany examination wheel to 11 and the experimental wheel of instruction carriage 2 between 14, realize run-in synchronism by frictional drive, with accompanying examination wheel to 11 analog orbits, accompany examination wheel to be connected with accompanying examination gear-box 10 11, accompany examination gear-box 10 to be connected with accompanying examination motor 9, accompany examination motor 9 to be connected with accompanying examination current transformer 8, accompany examination current transformer 8 to be connected with accompanying examination transformer 7.
Every pair of experimental wheel of instruction carriage 2 is to 14 corresponding a set of test systems of accompanying, and many covers accompany multiple the accompanying in test system to try gear-box 10 run-in synchronisms.
Instruction carriage 2 comprises that test car body 6, traction drive and experimental wheel are to 14 etc., and traction drive mainly comprises tractive transformer 15, traction convertor, traction electric machine, bogie, is mainly used in providing the load of rolling rig 1, i.e. subjects. Wherein tractive transformer 15, traction convertor and traction electric machine are as the traction drive of instruction carriage 2, for train provides tractive force.
Reaction rack equipment 3 is two, and the test car body 6 of the instruction carriage 2 that is mainly used in being strained and fixed at the trial, need to save compartment to which and test, just that the car body two ends in this joint compartment are fixing with two reaction rack equipments 3.
The data-signal that test bed testing system is mainly used in data acquisition unit to send gathers storage, and collected data are carried out to subsequent calculations, to draw wheel track resistance and self mechanical resistance of train.
Line powering device 5 is used to rolling rig 1 and instruction carriage 2 that energy is provided.
Data acquisition unit comprises torsion torque sensor 12 and voltage-current sensor 13, torsion torque sensor 13 is arranged on accompanying on examination gear-box 10 as machine driven system, torsion torque sensor 12 is mainly used in testing torsion moment of torsion to calculate output mechanical power, voltage-current sensor 13 is arranged on accompanies on the examination secondary side of transformer 7 and the primary side of tractive transformer 15, mainly for detection of voltage and current, to calculate input electric power, experimenter can need to determine arbitrarily test point according to test.
Train is carried out to wheel track resistance and mechanical resistance is tested, and the basic assumed condition of its analysis of experiments is:
Input electric power=output mechanical power+loss power.
Known according to law of conservation of energy, input electric energy=output mechanical energy+loss of energy, for the independent test system (being rolling rig 1), independent by test system (being instruction carriage 2) and accompany for the large system of examination+tested of accompanying, all analyses are all carried out in same time, therefore can have the hypothesis of power conservation.
Before test self mechanical resistance, first to record the wheel track resistance of train, describe the testing procedure of wheel track resistance below in detail:
Accompanying examination transformer 7, accompanying examination current transformer 8, accompany thermal technology's loss of examination motor 9 in rolling rig 1 is known. Thermal technology's loss of the tractive transformer 15 of instruction carriage 2, traction convertor, traction electric machine is also known. Experimental wheel is to 14 and accompany examination wheel can calculate the wheel-rail friction coefficient between 11.
Suppose that wheel track resistance is f2, f2Draw in two steps:
Step 1, as shown in Figure 1, does not add an examination of and validates the car 2, allows rolling rig 1 no-load running, obtains the loss power under rolling rig 1 friction speed level, is converted into unloaded equivalent Resistance Value f by calculating21。
Under no-load condition, selected test point, as shown in Figure 2, locate to arrange voltage-current sensor 13 at test point A (accompanying the primary side of examination transformer 7), for detection of the voltage and current of accompanying examination transformer 7 secondary sides in rolling rig 1, and then calculate the input electric power of rolling rig 1, test point B( accompany examination gear-box 10 and accompany examination wheel to 11 between) locate to arrange torsion torque sensor 12, for detection of the torsion moment of torsion of machine driven system in rolling rig 1, and then calculate the output mechanical power of rolling rig 1.
Utilize line powering device 5 to rolling rig 1 input power, through accompanying examination transformer 7, accompanying examination current transformer 8 to accompany examination motor 9 to turn round to accompanying examination motor 9 input powers, driving, accompany examination motor 9 to accompany examination wheel to 11 rotations by accompanying examination gear-box 10 to drive successively.
Test bed testing system 4 is by input electric power and the output mechanical power value of rolling rig 1 under synchronism detection, collection and calculating friction speed level, both differences obtain loss power, try transformer 7, accompany examination current transformer 8, accompany the thermal technology's loss value that tries motor 9 in conjunction with accompanying of rolling rig 1, extrapolate the zero load equivalence resistance f under rolling rig 1 Light Condition21。
Step 2, as shown in Figure 3, adds instruction carriage 2, allows rolling rig 1 run with load, again obtains the loss power under rolling rig 1 friction speed level, is converted into band carries an equivalent Resistance Value f by calculating22。
Carry in situation at band, selected test point, as shown in Figure 5, locate to arrange voltage-current sensor 13 at test point A (accompanying the secondary side of examination transformer 7), for detection of the voltage and current of accompanying examination transformer 7 secondary sides in rolling rig 1, and then calculate the input electric power of rolling rig 1, test point B( accompany examination gear-box 10 and accompany examination wheel to 11 between) locate to arrange torsion torque sensor 12, for detection of the torsion moment of torsion of machine driven system in rolling rig 1, and then calculate the output mechanical power of rolling rig 1.
As shown in Figure 3, instruction carriage 2 is placed on rolling rig 1 in uncharged situation, utilize line powering device 5 to rolling rig 1 input power, successively through accompanying examination transformer 7, accompanying examination current transformer 8 to accompanying examination motor 9 input powers, driving accompanies examination motor 9 to turn round, and accompanies examination motor 9 to accompany examination wheel to 11 rotations, as shown in Figure 4 by accompanying examination gear-box 10 to drive, accompany examination wheel to drive experimental wheel synchronously to rotate 14 11 by frictional drive, experimental wheel is to 14 passive rollings.
Test bed testing system is by input electric power and the output mechanical power value of rolling rig 1 under synchronism detection, collection and calculating friction speed level, both differences obtain loss power, try transformer 7, accompany examination current transformer 8, accompany the thermal technology's loss value that tries motor 9 in conjunction with accompanying of rolling rig 1, the band of extrapolating under rolling rig 1 band year state carries equivalent resistance f22。
Step 3, the equivalent Resistance Value f of above-mentioned zero load21Carry equivalent Resistance Value f with band22Between difference be wheel track resistance f2, i.e. f2=f22-f21。
, be described as follows as example taking test wheel track resistance under a certain speed v below:
The test data recording during for speed v, calculates respectively the equivalent Resistance Value f under this velocity stage by formula (1), formula (2)V21、fV22。
Equivalent Resistance Value under each velocity stage forms f jointly21、f22Be respectively
Wherein:
fV21: f when speed v21Unloaded equivalent Resistance Value;
fV22: f when speed v22Band carries equivalent Resistance Value;
ΔPV: rolling rig 1 total-power loss value when speed v, and；
ΔPVi: the loss power value of the i group rolling rig 1 calculating when speed v.
And have ；
Pi: the input power of the i group rolling rig 1 recording;
PVM2: thermal technology's loss value of accompanying examination motor 9 of rolling rig 1 when speed v;
PVCI2: thermal technology's loss value of accompanying examination current transformer 8 of rolling rig 1 when speed v;
PVMTR2: thermal technology's loss value of accompanying examination transformer 7 of rolling rig 1 when speed v;
V: speed class, unit (km/h).
Wherein, PVM2、PVCI2、PVMTR2For given value.
In process of the test, under each velocity amplitude, the data of test point A and test point B are wanted synchronism detection and record, and the test point A of synchronization, the data of test point B are called one group of data.
When velocity-stabilization is after setting value, should should carry out taking Δ t as interval N+1 test, obtain N+1 group data. Wherein, Δ t, N are determined by test program.
Whole process of the test, at least completes one and takes turns speed sweep check, from minimum speed according to set speed step-length raise speed to maximum speed, then again according to same speed step-length reduction of speed to minimum speed. If be subject to conditionality cannot directly complete speed sweep check, should have supplemented test under same trend condition.
Describe the testing procedure of train self mechanical resistance below in detail:
As shown in Figure 6 and Figure 7, accompanying examination transformer 7, accompanying examination current transformer 8, accompany thermal technology's loss of examination motor 9 in rolling rig 1 is known. Thermal technology's loss of the tractive transformer 15 of instruction carriage 2, traction convertor, traction electric machine is also known. Experimental wheel is to 14 and accompany examination wheel can calculate the wheel-rail friction coefficient between 11.
As shown in Figure 6, instruction carriage 2 is placed on rolling rig 1, utilize line powering device 5 to instruction carriage 2 input powers, initiatively operation of instruction carriage 2 after energising, experimental wheel is driven and is accompanied examination wheel synchronously to rotate 11 by frictional drive 14, accompanies examination wheel to accompany examination gear-box 10 to rotate to 11 drives, accompany examination gear-box 10 that power is passed to and accompanies examination motor 9, accompany examination motor 9 now as generator, output electric energy, successively through accompanying examination current transformer 8 and accompanying the outside out-put supply of examination transformer 7.
As shown in Figure 7, two test points are set on instruction carriage 2 and rolling rig 1, locate to arrange voltage-current sensor 13 at test point A (being the primary side of tractive transformer 15), for detection of input voltage and the electric current of tractive transformer 15 primary sides of instruction carriage 2, and then calculate the input electric power of instruction carriage 2, accompany examination gear-box 10 and accompany between examination takes turns 11 at test point B() locate to arrange torsion torque sensor 12, for detection of the torsion moment of torsion of machine driven system in instruction carriage 2, and then calculate the output mechanical power of instruction carriage 2.
Obtain comprising between vehicle own loss power and wheel track loss power at interior total loss power by instruction carriage 2 input electric powers and output mechanical power value under synchronism detection friction speed level, in conjunction with thermal technology's loss value of the tractive transformer 15 of instruction carriage 2, traction convertor, traction electric machine, calculate total equivalent resistance f. Total equivalent resistance f and wheel track resistance f2Difference be train self mechanical resistance.
The test data recording during for speed v (km/h) calculates the total equivalent Resistance Value f under this velocity stage by formula (3)V. Total equivalent Resistance Value under each velocity stage forms f jointly.
Wherein:
ΔPV: roller tray total-power loss value when speed v, and；
ΔPVi: the i group roller tray loss power value calculating when speed V (km/h),
And have ；
Pi: the input power of the i group instruction carriage 2 recording;
PVM1: thermal technology's loss value of instruction carriage 2 traction electric machines when speed V (km/h);
PVCI1: thermal technology's loss value of instruction carriage 2 traction convertors when speed V (km/h);
PVMTR1: thermal technology's loss value of instruction carriage 2 tractive transformers when speed V (km/h);
V: speed class, unit (km/h).
Wherein, PVM1、PVCI1、PVMTR1For given value.
In process of the test, under each velocity amplitude, the data of test point A and test point B are wanted synchronism detection and record, and the test point A of synchronization, the data of test point B are called one group of data.
When velocity-stabilization is after setting value, should should carry out taking Δ t as interval N+1 test, obtain N+1 group data. Wherein, Δ t, N are determined by test program.
Whole process of the test, at least completes one and takes turns speed sweep check, from minimum speed according to set speed step-length raise speed to maximum speed, then again according to same speed step-length reduction of speed to minimum speed. If be subject to conditionality cannot directly complete speed sweep check, should have supplemented test under same trend condition.
The present invention is a kind of testing arrangement and method based under laboratory condition, accompany by arrange a set of in laboratory the rolling rig system that studies use, measure the loss power under friction speed level, and then show that unloaded and band carries the equivalent resistance under state, further calculate again wheel track resistance and self mechanical resistance, measuring method and device are simple, and easy operating is measured accurately. The experimental test time can be controlled voluntarily, is subject to the impact of natural environment less. Based on the testing arrangement under laboratory condition, there is good reusability and interactivity, test node device interface adopts modular thinking, and test node is flexible arrangement as required, is not confined to the measurement of Train Wheel rail resistance and self mechanical resistance. For example: for train traction transmission system, also can, according to the corresponding measuring point of this testing arrangement structural configuration, carry out the correlated performance analysis of train traction transmission system by data such as actual measurement voltage, electric current, power.
As mentioned above, given scheme content, can derive similar technical scheme by reference to the accompanying drawings. In every case be the content that does not depart from technical solution of the present invention, any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all still belong in the scope of technical solution of the present invention.
Claims (9)
1. a testing arrangement for train self mechanical resistance, is characterized in that, comprising:
Instruction carriage, comprises test car body, tractive transformer, traction convertor, traction electric machine, bogie and testIt is right to take turns;
Reaction rack equipment, for the test car body of fixation test car at the trial;
Be arranged on the rolling rig in laboratory, for providing driving force to described instruction carriage, make described instruction carriageSpeed reaches corresponding speed grade, and described rolling rig comprises at least a set of test system of accompanying, described in accompany test system bagDraw together successively accompanying examination transformer, accompany examination current transformer, accompanying examination motor, accompany examination gear-box and accompany examination wheel right, institute of connectingState accompany examination wheel to and the experimental wheel of described instruction carriage between realize synchronous operation by frictional drive, described in accompany examination to becomeDepressor is connected with line powering device;
Data acquisition unit, for gather the input voltage and input current of described instruction carriage and outputting torsion moment of torsion data andThe input voltage and input current of rolling rig and outputting torsion moment of torsion data;
Test bed testing system, is connected with described data acquisition unit, for gathering storing data information, and to instituteThe data of collecting are carried out subsequent calculations, to draw self mechanical resistance of train;
Line powering device, is used to described rolling rig and instruction carriage that energy is provided.
2. the testing arrangement of train according to claim 1 self mechanical resistance, is characterized in that: described examinationDescribed in every pair of described experimental wheel of validating the car is a set of to correspondence, accompany test system, accompany described in many covers described in multiple in test systemAccompany the run-in synchronism of examination gear-box.
3. the testing arrangement of train according to claim 1 self mechanical resistance, is characterized in that: described numberComprise torsion torque sensor and voltage-current sensor according to harvester.
4. the testing arrangement of train according to claim 3 self mechanical resistance, is characterized in that: described in turn roundDescribed in power torque sensor is arranged on, accompany examination gear-box and accompany examination wheel between, described voltage-current sensor is arranged onDescribed accompanying on the examination secondary side of transformer and the primary side of described tractive transformer.
5. the test of the testing arrangement of employing train self mechanical resistance as described in claim 1-4 any oneMethod, is characterized in that, comprises the steps:
Add instruction carriage, allow instruction carriage drive rolling rig synchronous operation by frictional drive;
Under synchronism detection friction speed level, instruction carriage input electric power and output mechanical power obtain comprising vehicle self damageBetween wasted work rate and wheel track, loss power is at interior total losses power;
Total losses power is converted into total equivalent resistance by calculating;
Difference between total equivalent resistance and wheel track resistance is train self mechanical resistance.
6. the method for testing of the testing arrangement of train according to claim 5 self mechanical resistance, its feature existsIn: described wheel track resistance draws by following testing procedure;
Allow described rolling rig no-load running, obtain the loss power of rolling rig under friction speed level, logicalCross to calculate and be converted into unloaded equivalent Resistance Value;
Add instruction carriage again, allow described rolling rig run with load, rolling rig drives institute by frictional driveState instruction carriage operation, obtain the loss power of described rolling rig under friction speed level, be converted into by calculatingBand carries equivalent Resistance Value;
Unloaded equivalent resistance and band carry the difference between equivalent resistance, are described wheel track resistance.
7. the method for testing of the testing arrangement of train according to claim 6 self mechanical resistance, its feature existsIn: in described rolling rig accompanying examination gear-box and accompany examination wheel between torsion torque measuring pilot is set, inCalculate output mechanical power, in the examination of accompanying of the primary side of the tractive transformer of described instruction carriage and described rolling rigThe secondary side of transformer arranges electric current and voltage test point, to calculate input electric power, described total losses power,Loss power under loss power under rolling rig no-load running and rolling rig run with load is all by calculatingThe difference of input electric power and output mechanical power draws.
8. according to the method for testing of the testing arrangement of the train described in claim 5 or 6 self mechanical resistance, its featureBe: the data of test friction speed level are when velocity-stabilization is after setting value, carry out N+1 time as interval taking Δ tTest, obtains N+1 group data.
9. the method for testing of the testing arrangement of train according to claim 8 self mechanical resistance, its feature existsIn: from minimum speed, raise speed to maximum speed according to the speed step-length of setting, then again according to same speed stepLong reduction of speed, to minimum speed, at least completes one and takes turns speed sweep check.
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