CN105844019B - A kind of grounding point selection method based on surface of vehicle current distribution - Google Patents
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Abstract
The present invention relates to a kind of grounding point selection methods based on the vehicle earth-current regularity of distribution, belong to vehicle ground point selection method.Electromagnetic vehicle simulation model is established by setting polarisation angles, incident angle and incident direction using CST MS electromagnetic simulation software；Vehicle earth-current is distributed using CST MS software and carries out simulation calculation；Change simulated conditions, emulate one by one it is each under the conditions of vehicle earth-current distribution；It determines the regularity of distribution of vehicle earth-current, and is based on the rule, the selection of guiding vehicle grounding point position.The invention advantage is the attack by simulating true high-altitude nuclear detonation electromagnetic pulse to vehicle, obtain the relationship between frequency and earth-current distributed stripes number, the angle scientific guidance vehicle ground being distributed from earth-current, to reduce earth-current to the electromagnetic interference of interior electronic equipment, electronic equipment is worked normally.
Description
Technical field
The present invention relates to a kind of grounding point selection methods based on the vehicle earth-current regularity of distribution, for strong electromagnetic pulse ring
The regularity of distribution of surface of vehicle earth-current is statisticallyd analyze in border, and the selection of guiding vehicle grounding point accordingly, is solved
The problem with grounding in Spark gap field.
Background technique
Under normal circumstances, in-vehicle device is using surface of vehicle shell as " the earth ".In Strong Electromagnetic Pulse, such as high-altitude
Nuclear explosion electromagnetic pulse (High Altitude Electromagnetic Pulse, HEMP), vehicle surface of shell and interior electricity
Electric current would generally be coupled out in sub- equipment surface, the electric current on vehicle shell surface is earth-current.The presence of earth-current can generate electromagnetism
, corresponding interference voltage can also be formed in the line, finally form Conducted Electromagnetic Interference between the individual devices, influence interior electricity
The normal use of sub- equipment.The electromagnetic pulse protection technologies such as shielding, ground connection are the important channels of solution problems, wherein about
Grounding technology, it is most of at present to use " nearby principle ", the ground cable of interior numerous equipment is commonly connected to connecing for car body
On ground bolt, although the selection mode of this earthing position makes ground path shorten, but in view of it is theoretic can
Row influences the normal use of electronic equipment if earth-current distribution can bring electromagnetic interference to interior electronic equipment.Herein from ground
The angle of current distribution, the selection of scientific guidance body grounding position reduce in-vehicle device by electromagnetic pulse interference to reach
Purpose.
Xiang-Hua Wang et al. obtains intentional electromagnetic pulse using improved Leapfrog ADI-FDTD algorithm
IEMP motivates the current distribution on surface of getting off the plane, and Concettina Buccella is calculated using circuit methods, all if any non-
Linearly on the metal structure fuel tank of impedance, it is distributed by the transient current that lightning impulse induces.Pan Qijun and Ma Weiming et al.
The analysis for having comparison deep and careful the measuring technique on naval vessel, Steel Plate Ground Current Measurement Apparatus.
CST MS electromagnetic simulation software is the all-wave time domain frequency produced by the famous electromagnetic field simulation software company CST of Germany
Domain electromagnetic field simulation software.It is a specially towards the accurate effective electromagnetic simulation software of 3 D electromagnetic field designer.Benefit
With the electromagnetic simulation software, corresponding electromagnetic simulation model can be established according to actual needs, and the object is calculated in driving source
Cable voltage, electric current under irradiation, the response such as distribution of space electric field, magnetic field and body surface electric current.
Summary of the invention
The present invention provides a kind of grounding point selection method based on the vehicle earth-current regularity of distribution, by studying in high-altitude core
In quick-fried electromagnetic pulse irradiation environment, the regularity of distribution of surface of vehicle earth-current, to solve grounding point in Spark gap field
The problem of selection.
The technical solution adopted by the present invention is that: include the following steps:
One, the practical structures for analyzing two-box automobile, establish electromagnetic vehicle model, polarisation angles and incidence using CST MS software
Angle is disposed as 0 degree, and incident direction is set as X-axis positive direction；
Two, using electromagnetic software CST MS, the distribution of surface of vehicle electric current, is somebody's turn to do in simulation calculation HEMP radiation environment
The distribution response of vehicle surface current under simulated conditions；
Three, change polarisation angles, incident angle and incident direction respectively, emulate one by one it is each under the conditions of surface of vehicle electricity
Flow distribution is as a result, obtain current distribution analogous diagram；
Four, the relationship between research and application frequency and surface of vehicle current distribution determines the distribution rule of surface of vehicle electric current
Rule；
Five, the regularity of distribution based on the resulting surface of vehicle electric current of step 4 is chosen vehicle according to current fluctuation striped and is connect
The position in place.
Electromagnetic vehicle model is established using CST MS software in step 1 of the present invention, it be according to actual vehicle knot
Structure, including shell, the material of engine system, dimensional parameters, it then follows camber line is replaced with straight line, the equivalent of protrusion is replaced with plane
Simplification principle establishes electromagnetic vehicle model.
Emulated one by one in step 3 of the present invention it is each under the conditions of surface of vehicle current distribution as a result, referring to three kinds
The simulated conditions of type, simulated conditions one: incident angle is 0 degree, and when incident direction is X-axis positive direction, polarization direction is respectively
30 degree, 45 degree, 60 degree and 90 degree；Simulated conditions two: polarisation angles are 0 degree, when incident direction is X-axis positive direction, incident angle
Respectively 30 degree, 45 degree and 60 degree；Simulated conditions three: polarisation angles and incident angle are 0 degree, and incident direction is respectively Y-axis
Positive direction, Z axis negative direction.
Relationship in step 4 of the present invention between monitoring frequency and surface of vehicle current distribution, refers to car body surface
The number and frequency of the current fluctuation striped of appearance meet formulaN is electric current striped number in formula, and L is vehicle body
The longest dimension of one plane, f are frequency, and c indicates the light velocity.
The position for choosing vehicle ground point in step 5 of the present invention according to current fluctuation striped, refers to when frequency height
To when being enough to occur electric current striped, if electric current striped number n is even number, cover plane or ceiling plane is arranged in grounding point
TheWithCenter between electric current striped；If n is odd number, grounding point is arranged in cover plane
Or the of ceiling planeThe center position of electric current striped.
The invention has the following beneficial effects:
1 present invention polarisation angles, incident angle and the incident direction different by simulation calculation, simulate true high-altitude nuclear detonation
Attack of the electromagnetic pulse to vehicle obtains the regularity of distribution of the surface of vehicle electric current in strong electromagnetic pulse radiation environment, is into one
Step research strong electromagnetic pulse effect is laid a good foundation；
2 present invention obtain the relationship between monitoring frequency and electric current striped number, and striped number is applied to vehicle
The selection of grounding point, from earth-current distribution angle scientifically guiding vehicle grounding point position, more than traditional earthing position selection
Have theoretical completeness, and earth-current can be reduced, the electromagnetic coupling of vehicle interior electronic equipment is acted on, enables electronic equipment
It works normally, from the interference of strong electromagnetic pulse.
Detailed description of the invention
Fig. 1 is flow chart of the invention；
Fig. 2 is the electric field strength time domain waveform of driving source high-altitude nuclear detonation electromagnetic pulse HEMP；
Fig. 3 is the coordinate schematic diagram of simulation model of the present invention；
Fig. 4 is that polarisation angles and incident angle of the present invention are 0 degree, and incident direction is X-axis positive direction, and monitoring frequency is
The earth-current distributed simulation result figure of 36MHz；
Fig. 5 is that polarisation angles and incident angle of the present invention are 0 degree, and incident direction is X-axis positive direction, and monitoring frequency is
The earth-current distributed simulation result figure of 180MHz；
Fig. 6 is that polarisation angles and incident angle of the present invention are 0 degree, and incident direction is X-axis positive direction, and monitoring frequency is
The earth-current distributed simulation result figure of 540MHz；
Fig. 7 is that polarisation angles of the present invention are 30 degree, and incident angle is 0 degree, and incident direction is X-axis positive direction, monitoring frequency
For the earth-current distributed simulation result figure of 36MHz；
Fig. 8 is that polarisation angles of the present invention are 45 degree, and incident angle is 0 degree, and incident direction is X-axis positive direction, monitoring frequency
For the earth-current distributed simulation result figure of 36MHz；
Fig. 9 is that polarisation angles of the present invention are 60 degree, and incident angle is 0 degree, and incident direction is X-axis positive direction, monitoring frequency
For the earth-current distributed simulation result figure of 36MHz；
Figure 10 is that polarisation angles of the present invention are 90 degree, and incident angle is 0 degree, and incident direction is X-axis positive direction, monitoring frequency
For the earth-current distributed simulation result figure of 36MHz；
Figure 11 is that incident angle of the present invention is 30 degree, and polarisation angles are 0 degree, and incident direction is X-axis positive direction, monitoring frequency
For the earth-current distributed simulation result figure of 540MHz；
Figure 12 is that incident angle of the present invention is 45 degree, and polarisation angles are 0 degree, and incident direction is X-axis positive direction, monitoring frequency
For the earth-current distributed simulation result figure of 540MHz；
Figure 13 is that incident angle of the present invention is 60 degree, and polarisation angles are 0 degree, and incident direction is X-axis positive direction, monitoring frequency
For the earth-current distributed simulation result figure of 540MHz；
Figure 14 is that polarisation angles and incident angle of the present invention are 0 degree, and incident direction is Y-axis positive direction, and monitoring frequency is
The earth-current distributed simulation result figure of 540MHz；
Figure 15 is that polarisation angles and incident angle of the present invention are 0 degree, and incident direction is Z axis negative direction, and monitoring frequency is
The earth-current distributed simulation result figure of 540MHz；
Figure 16 is simulation model of the grounding point of the present invention in vehicle body plane；
Figure 17 is ground connection model of the grounding point of the present invention in proposed cover plane striped middle position；
Figure 18 is ground connection model of the grounding point of the present invention in proposed ceiling plane striped middle position；
Figure 19 is ground connection model of the grounding point of the present invention in vehicle body side；
Figure 20 is the schematic diagram of the longest dimension L of a certain plane of vehicle body of the present invention.
Specific embodiment
Include the following steps:
One, the practical structures for analyzing two-box automobile, establish electromagnetic vehicle model, polarisation angles and incidence using CST MS software
Angle is disposed as 0 degree, and incident direction is set as X-axis positive direction；
Two, using electromagnetic software CST MS, the distribution of surface of vehicle electric current, is somebody's turn to do in simulation calculation HEMP radiation environment
The distribution response of vehicle surface current under simulated conditions；
Three, change polarisation angles, incident angle and incident direction respectively, emulate one by one it is each under the conditions of surface of vehicle electricity
Flow distribution is as a result, obtain current distribution analogous diagram；
Four, the relationship between research and application frequency and surface of vehicle current distribution determines the distribution rule of surface of vehicle electric current
Rule；
Five, the regularity of distribution based on the resulting surface of vehicle electric current of step 4 is chosen vehicle according to current fluctuation striped and is connect
The position in place.
Electromagnetic vehicle model is established using CST MS software in step 1 of the present invention, it be according to actual vehicle knot
Structure, including shell, the material of engine system, dimensional parameters, it then follows camber line is replaced with straight line, the equivalent of protrusion is replaced with plane
Simplification principle establishes electromagnetic vehicle model.
Emulated one by one in step 3 of the present invention it is each under the conditions of surface of vehicle current distribution as a result, referring to three kinds
The simulated conditions of type, simulated conditions one: incident angle is 0 degree, and when incident direction is X-axis positive direction, polarization direction is respectively
30 degree, 45 degree, 60 degree and 90 degree；Simulated conditions two: polarisation angles are 0 degree, when incident direction is X-axis positive direction, incident angle
Respectively 30 degree, 45 degree and 60 degree；Simulated conditions three: polarisation angles and incident angle are 0 degree, and incident direction is respectively Y-axis
Positive direction, Z axis negative direction.
Relationship in step 4 of the present invention between monitoring frequency and surface of vehicle current distribution, refers to car body surface
The number and frequency of the current fluctuation striped of appearance meet formulaN is electric current striped number in formula, and L is vehicle body
The longest dimension of one plane, f are frequency, and c indicates the light velocity.
The position for choosing vehicle ground point in step 5 of the present invention according to current fluctuation striped, refers to when frequency height
To when being enough to occur electric current striped, if electric current striped number n is even number, cover plane or ceiling plane is arranged in grounding point
TheWithCenter between electric current striped；If n is odd number, grounding point is arranged in cover plane
Or the of ceiling planeThe center position of electric current striped.
Below in conjunction with attached drawing, the grounding point selection method in the present invention based on surface of vehicle current distribution is carried out
Complete description.CST MS electromagnetic simulation software is used in the present invention, according to actual vehicle structure, including shell, engine
The size of these important systems, material parameters, it then follows camber line is replaced with straight line, protrusion is replaced with plane, ignores glass, plastics knot
The equivalent-simplification principle of structure, establishes vehicle geometrical model.It is metallic aluminium that the shell and engine of vehicle, which are disposed as material,
Rectangular cavities, conductivity are 3.54 × 107S/m, cavity thickness 5mm.
The waveform parameter of driving source high-altitude nuclear detonation electromagnetic pulse HEMP is set, HEMP be in the form of Double exponential pulse as
Electric field strength expression formula, i.e. E (t)=kp(e-αt-e-βt), in formula, kp=6.5 × 104V/m, α=4 × 107S-1, β=6 × 108S-1, kpIndicate that peak value of pulse, α indicate pulse front edge parameter, β indicates pulse back edge parameter, and t indicates time, electric field strength time domain wave
Shape figure is as shown in Figure 2.
Monitoring frequency is set.According to electromagnetic wave propagation theory λ=c/f, wherein c is the light velocity, and f is frequency, and λ is wave
It is long.According to antenna theory, half-wavelength is an important factor for current distribution.Due to electric size=dimension of object/wave
It is long, according to the size of car body important feature, corresponding frequency when electric size is half wavelength is calculated, as emulation monitoring frequency
Reference value.Monitoring frequency should be able to include the public multiple of minimum resonance frequency as far as possible.It calculates and counts by numerical value, it is final to establish
Emulate monitoring frequency.
The incident direction problem being related in the present invention is foundation by emulation coordinate schematic diagram as shown in Figure 3.?
It is 0 degree that polarisation angles are arranged in CST MS software, and incident angle is 0 degree, and incident direction is X-axis positive direction, ultimately generates electromagnetism
Model.Simulation calculation is carried out to surface of vehicle current distribution using electromagnetic simulation software CST MS, is obtained under the simulated conditions
Response.Then change polarisation angles, incident angle, incident direction respectively, emulate the surface of vehicle electric current under the conditions of three kinds one by one
Distribution results.Simulated conditions one: incident angle is 0 degree, and when incident direction is X-axis positive direction, polarization direction is respectively 30 degree, 45
Degree, 60 degree and 90 degree；Simulated conditions two: polarisation angles are 0 degree, and when incident direction is X-axis positive direction, incident angle is respectively 30
Degree, 45 degree and 60 degree；Simulated conditions three: polarisation angles and incident angle are 0 degree, and incident direction is respectively Y-axis positive direction, Z
Axis negative direction.
By antenna theory it is found that the approximate natural electric current distribution on thin straight antenna shows sine law, that is, it will appear electricity
The case where stream is 0.It extends in plane, when the electric size of object is the integral multiple of half-wavelength, can go out in corresponding frequency
Now similar rule such as fluctuates the generation of striped.Analysis simulated current distribution map can be found, with the increase of monitoring frequency, vehicle
It will appear current fluctuation striped on body surface face, the size of current value gradually changes in striped, regularly arranges, such as fluctuation
Water wave, and the number of striped is related with frequency.The trend of striped and the direction of propagation of driving source are vertical.Statistic analysis knot
The relationship of car body surface current fluctuation striped number and frequency in fruit, such as Fig. 4-6, obtain electric current striped number and physical size,
The relationship of frequency:
In formula, n is electric current striped number, and L is the longest dimension of a certain plane of vehicle body, and f is frequency, and c indicates the light velocity.
Under the simulated conditions of different polarisation angles, current convergence is distributed in window frame, vehicle body edge, edges and corners, in size
Current distribution is more uniform in biggish plane, and current value very little.At this point, with the change of polarisation angles, current fluctuation item
The number of line does not change correspondingly, and only current value is slightly different.
Under the simulated conditions of incidence angles degree, the position electric current close to driving source is larger, the position far from driving source
Electric current is smaller.With the increase of incident angle, the tilt angle of striped is increase accordingly.This is because driving source enters with certain
When firing angle is spent, in the component for having driving source in X-axis and the direction along Y-axis, the comprehensive function of the two durection components is caused
Current distribution has the phenomenon that certain tilt angle, as figs 11-13.
Under the simulated conditions of different incident directions, the striped trend of electric current and the symmetry of current distribution are sent out therewith
It is raw to change.Analyze simulation result discovery, when incident direction be along X-axis, Z axis when, current fluctuation striped be along Y-axis, when
When the incident direction of driving source is irradiated along Y-axis, current fluctuation striped the direction of current fluctuation striped and is swashed along X-axis
The irradiation direction for encouraging source is vertical.Simultaneously when incident direction is along X-axis, Z axis irradiation, current distribution is symmetrical with YOZ plane, when sharp
When encouraging the incident direction in source along Y-axis irradiation, current distribution is without symmetry, as shown in figs. 14-15.
The comprehensive rule for grasping the above current distribution can instruct the grounding point for choosing vehicle.No matter driving source is with which kind of pole
Change angle, incident angle and incident direction are irradiated, when frequency height arrives when current fluctuation striped can occur, if n is idol
The center (n/2) and (n/2+1) article electric current striped between of the grounding point in larger plane is arranged in number；If n is surprise
Number, grounding point may be disposed at the center position of (n/2+1/2) article electric current striped.It is scientifically instructed from earth-current distribution angle
Vehicle ground point position can reach the electromagnetic coupling effect for reducing earth-current to vehicle interior electronic equipment, so that electronics is set
It is standby to work normally, from the interference of strong electromagnetic pulse.
Emulate case
Establishing basic size is 4.2m × 1.45m × 1.16m vehicle geometrical model, and it is metallic aluminium, chamber that its material, which is arranged,
Body thickness is 5mm, loads driving source HEMP, according to electric size=dimension of object/wavelength, calculates half-wavelength at car body important feature
Corresponding frequency, is listed as follows:
The corresponding frequency of wavelength of 1 car body important feature of table
| Position | Car body is leaned to one side | Body width | Headstock plane | Ceiling length |
| Size | 4.2m | 1.45m | 0.46m | 2.6m |
| Half-wavelength respective frequencies | 36M | 103M | 130M | 57.6M |
It calculates and counts by numerical value, select emulation monitoring frequency.180MHz is that several electric sizes are corresponding frequently with 540MHz
The public resonance frequency that rate is closer to.Therefore, selection 36MHz, 180MHz and 540MHz is as resonance monitoring frequency.
It is 0 degree when primary condition is set as polarisation angles, incident angle is 0 degree, when incident direction is X-axis positive direction, prison
Current distribution at measured frequency is as shown in Figure 4-Figure 6.
It can be seen that current convergence is distributed in window frame of automobile, corner angle, vehicle body marginal position first, with the increase of frequency, car body
There is current fluctuation striped in surface, and the relationship of statistics striped number and position, frequency obtains table 2:
2 car body electric current striped number statistical of table
By data in table 2 it is found that the electric current striped number of car body position meets current fluctuation striped formulaIn formula, n is electric current striped number, and L is the longest dimension of a certain plane of vehicle body, when lid planar ground is selected a good opportunity in choosing,
L is longer B in A in Figure 20 and B, or when selection ceiling plane ground connection, and L is that longer b, f are frequency in a and b in Figure 20
Rate, c indicate the light velocity.
Grounding point verifying
By being analyzed above it is found that (n/2) article current fluctuation striped is arranged in cover plane or ceiling in grounding point
Center position can reduce interference of the electromagnetic interference to in-vehicle device.Therefore, it emulates grounding point setting respectively in cover, top
The center of canopy plane (n/2) article current fluctuation striped, vehicle body edge, vehicle lean to one side, the non-striped place of cover, non-article of ceiling
At line, the electric current that comparative apparatus surface is coupled to, model difference is as illustrated in figs. 16-19.When monitoring frequency is 540MHz, car is set
The maximum value and minimum value statistical result of the current density on standby surface are as shown in table 3.
The comparison of 3 in-vehicle device surface current density of table
Pass through the data in contrast table 3, it can be seen that the electric current at cover middle stripe and at ceiling middle stripe is close
It spends smaller than the current density in vehicle other places.By using formula:
(electric current at non-striped place's electric current-middle stripe)/non-striped place's electric current, obtains the relative size of current density value,
Such as draw a conclusion by statistics discovery:
1) when earthing position is on cover, ceiling plane, the current density on interior electronic equipment surface generally compares vehicle body
On current density it is small, illustrate that cover, the reasonability on ceiling plane is arranged in grounding point；
2) when earthing position at cover middle stripe, at the non-middle stripe of cover plane, interior electronic equipment surface
The minimum value difference 50% of current density, maximum current difference 46.7% are that earthing position is small at cover middle stripe, say
Bright reasonability grounding point being arranged on middle stripe；
3) when earthing position at ceiling middle stripe, at the non-middle stripe of ceiling plane, interior electronic equipment surface
The minimum value difference 60% of current density, maximum current difference 40%, is that earthing position is small at ceiling plane middle stripe,
Illustrate reasonability grounding point being arranged on middle stripe.
Therefore, it by the size of interior electronic equipment surface current, demonstrates one kind proposed by the invention and is based on vehicle
The validity of the grounding point selection method of the earth-current regularity of distribution reduces the electromagnetic interference that interior electronic equipment is subject to.
Claims (3)
1. a kind of grounding point selection method based on surface of vehicle current distribution, it is characterised in that include the following steps:
One, the practical structures for analyzing two-box automobile, establish electromagnetic vehicle model, polarisation angles and incident angle using CST MS software
It is disposed as 0 degree, incident direction is set as X-axis positive direction；
Two, using electromagnetic software CST MS, the distribution of surface of vehicle electric current in simulation calculation HEMP radiation environment obtains emulation item
The distribution response of vehicle surface current under part；
Three, change polarisation angles, incident angle and incident direction respectively, emulate one by one it is each under the conditions of surface of vehicle electric current point
Cloth is as a result, obtain current distribution analogous diagram；
Four, the relationship between research and application frequency and surface of vehicle current distribution determines the regularity of distribution of surface of vehicle electric current；Institute
State the relationship between monitoring frequency and surface of vehicle current distribution, refer to car body surface occur current fluctuation striped number with
Frequency meets formulaN is electric current striped number in formula, and L is the longest dimension of a certain plane of vehicle body, and f is frequency, c
Indicate the light velocity；
Five, the regularity of distribution based on the resulting surface of vehicle electric current of step 4 chooses vehicle ground point according to current fluctuation striped
Position, when frequency high enough to when there is electric current striped, if electric current striped number n be even number, by grounding point be arranged in cover
The of plane or ceiling planeWithCenter between electric current striped；If n is odd number, will ground connection
The of cover plane or ceiling plane is arranged in pointThe center position of electric current striped.
2. a kind of grounding point selection method based on surface of vehicle current distribution according to claim 1, feature
It is: establishes electromagnetic vehicle model using CST MS software in the step 1, it is including outer according to actual vehicle structure
Shell, the material of engine system, dimensional parameters, it then follows camber line is replaced with straight line, the equivalent-simplification principle of protrusion is replaced with plane,
Establish electromagnetic vehicle model.
3. a kind of grounding point selection method based on surface of vehicle current distribution according to claim 1, feature
Be: emulated one by one in the step 3 it is each under the conditions of surface of vehicle current distribution as a result, referring to the emulation of three types
Condition, simulated conditions one: incident angle is 0 degree, when incident direction is X-axis positive direction, polarization direction is respectively 30 degree, 45 degree,
60 degree and 90 degree；Simulated conditions two: polarisation angles are 0 degree, when incident direction is X-axis positive direction, incident angle is respectively 30 degree,
45 degree and 60 degree；Simulated conditions three: polarisation angles and incident angle are 0 degree, and incident direction is respectively that Y-axis positive direction, Z axis are negative
Direction.
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| CN110514893A (en) * | 2019-08-14 | 2019-11-29 | 北京卫星环境工程研究所 | The method of micromechanics electric-field sensor measurement spacecraft local surfaces electrified voltage |
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| CN102707170A (en) * | 2012-05-25 | 2012-10-03 | 北京航空航天大学 | Method for testing electro-magnetic compatibility of automotive CAN (controller area network) buses based on semi-physical simulation |
| CN104659974A (en) * | 2013-11-17 | 2015-05-27 | 韩磊 | Electromagnetic field shielding system for driving motor of electric vehicle |
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| CN102783000B (en) * | 2010-03-01 | 2015-01-21 | 西门子公司 | Electric machine for which the grounding function is monitored and method |
| DE102014008216B4 (en) * | 2014-05-28 | 2015-12-24 | Diehl Bgt Defence Gmbh & Co. Kg | Motor vehicle and reflector for a motor vehicle |
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| CN102707170A (en) * | 2012-05-25 | 2012-10-03 | 北京航空航天大学 | Method for testing electro-magnetic compatibility of automotive CAN (controller area network) buses based on semi-physical simulation |
| CN104659974A (en) * | 2013-11-17 | 2015-05-27 | 韩磊 | Electromagnetic field shielding system for driving motor of electric vehicle |
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