CN102520267A - Method for testing signal transmission performance of electric conductive slip ring - Google Patents
Method for testing signal transmission performance of electric conductive slip ring Download PDFInfo
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- CN102520267A CN102520267A CN2011103608744A CN201110360874A CN102520267A CN 102520267 A CN102520267 A CN 102520267A CN 2011103608744 A CN2011103608744 A CN 2011103608744A CN 201110360874 A CN201110360874 A CN 201110360874A CN 102520267 A CN102520267 A CN 102520267A
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- slip ring
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- signal transmission
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Abstract
The invention discloses a method for testing the signal transmission performance of an electric conductive slip ring. The method comprises the following steps of: adopting an error rate test box of which a sending end and a receiving end are connected with each path of electric conductive slip ring channel in turn; setting a level protocol and a baud rate; respectively testing a static error rate and a dynamic error rate of the channel; connecting each path of electric conductive slip ring in turn and testing the error rate; testing the static error rate and the dynamic error rate of each channel; and if the static error rate and the dynamic error rate of a certain path of channel are both less than 1e-7, confirming that the signal transmission performance of the channel of the electric conductive slip ring is excellent and is useable. The invention provides a direct and reliable method for evaluating indexes and testing the signal transmission performance of the electric conductive slip ring. The method is suitable for the test and application of the electric conductive slip ring under different application environments.
Description
Technical field
The present invention relates to the method for conducting slip ring signal testing, especially design a kind of method of testing conductive slip ring signal transmission performance.
Background technology
Conducting slip ring is to realize two accurate electromechanical assemblies that relatively rotate inter-agency electric signal and electric power transmission, claims collector ring, rotation electric interfaces again.This type of device is in field extensive application such as industrial automation, medicine equipment and national defence aviations.
Conducting slip ring mainly is made up of two major parts of slip ring and brush silk, and both ways of contact have a contact and face contact type.The contact resistance of conducting slip ring directly can influence the effect of signal transmission.General contact resistance is more little good more.Influence the material of the factor of contact resistance size, outside the contact form of surface of contact, also comprise the pressure of brush silk slip ring except contact portion.The big more contact resistance of pressure is more little, but the increase of pressure has certain limit, can increase moment of friction if go beyond the limit, and makes the contact portion wearing and tearing very big.Conducting slip ring generally adopts revolution as its life-span measurement index, and conducting slip ring is about several ten million commentaries on classics the highest serviceable life, if be applied in the high speed rotating occasion, the life-span also is limited.The characteristic requirements of conducting slip ring regularly detects its performance, to guarantee that conducting slip ring is reliable in the actual use.
The major parameter of conducting slip ring comprises physical dimension, Static Contact resistance, dynamic contact resistance, insulation resistance, dielectric strength and moment of friction etc.These parameters are except carrying out the system testing each item in manufacturing process; Then be the serviceability of simply judging conducting slip ring through testing contact resistance generally in actual the use, test result can't provide direct evaluation to the conducting slip ring signal transmission performance according to application system.
Summary of the invention
Imperfection to the detection method of conducting slip ring signal transmission performance under the present site environment; The object of the present invention is to provide a kind of method of testing conductive slip ring signal transmission performance; Use an error rate test box to connect the conducting slip ring two ends; Under selected communication interface and baud rate, the static and dynamic bit error rate of testing conductive slip ring channel signal transmission is as the method for testing conductive slip ring signal transmission performance.
Inventive principle:
As the major parameter of conducting slip ring, contact resistance, insulation resistance, anti-interference intensity and moment of friction all can influence the effect of signal transmission.The conducting slip ring performance can equivalence be problems such as signal transmission, integrality in the applied environment.The simplest method can be passed through bit error rate evaluation.The present invention uses an error rate test box to connect the conducting slip ring two ends, and under selected communication interface and baud rate, the static and dynamic bit error rate of testing conductive slip ring channel signal transmission is as the method for testing conductive slip ring signal transmission performance.
The bit error rate is relevant with the mode of operation of conducting slip ring, promptly with conducting slip ring on the level agreement and the baud rate of communication relevant.The communication capacity of varying level agreement and applied environment have than big-difference, and be different with the transmission range that the CMOS level is suitable for like Transistor-Transistor Logic level.The then suitable level agreements such as RS422 or RS485 of selecting of Distance Transmission if rectificate.Under the condition that the application system transmission range is fixed, simply judge that according to a kind of bit error rate of communications protocol whether conducting slip ring meets the demands also is perfect inadequately.The bit error rate is relevant with the baud rate of system, and baud rate is fast more, is easy to generate error code more.In a word, the evaluation of the bit error rate need be taken all factors into consideration the conducting slip ring mode of operation, so that the working range that satisfies application request to be provided.
Conducting slip ring static when rotating the contact resistance performance different, need when testing conductive slip ring signal transmission performance, take in equally.During rotation, the conducting slip ring contact resistance can change with the pressure between brush silk and slip ring or wearing and tearing change, and generally changes within the specific limits, and is excessive if contact resistance changes, and can influence the signal transmission.Corresponding error rate test also comprises two aspects: static error rate BER 1 and dynamic error rate BER 2.When conducting slip ring is static, transmitting terminal t in second with baud rate v
0Send n incremental number, receiving end receives and also to calculate m error code, the static error rate BER 1 of conducting slip ring promptly:
BER1=m/n/t×100%|
v=vo
When conducting slip ring rotates continuously, transmitting terminal t in second with baud rate v
0Send n incremental number, receiving end receives and calculates m error code, and dynamically error rate BER 2 is:
BER2=m/n/t×100%|
v=vo
Change test slip ring passage successively, record the static bit error rate and the dynamic bit error rate under corresponding level agreement and the baud rate, obtain the two-dimensional data table of the conducting slip ring bit error rate, signal transmission performance is how under the application-specific condition to confirm conducting slip ring.
Promptly through sending the series of features data, characteristic can be incremental number to the error rate test box, or pseudo random number, through accepting these data, compares with the transmission data, judges whether to be error code.
The step of the technical scheme that the present invention adopted is following:
1) transmitting terminal, the receiving end with the error rate test box links to each other with receiving end conducting slip ring port with the transmitting terminal conducting slip ring port of the same passage of conducting slip ring respectively; First SS of error rate test box is selected corresponding level agreement according to environment for use, and second SS of error rate test box is selected corresponding baud rate;
2) conducting slip ring relatively rotates body, receiving end at transmitting terminal and relatively rotates body when static relatively, opens the error rate test box, records the static bit error rate;
3) conducting slip ring relatively rotates the relative receiving end of body at transmitting terminal and relatively rotates body when rotating continuously with 1 °/s speed, opens the error rate test box, records the dynamic bit error rate;
4) repeating step 1) ~ 3), each passage of conducting slip ring is tested, record the static bit error rate and the dynamic bit error rate of each passage;
5) static bit error rate data that record each passage according to step 4) and dynamic bit error rate data if the static bit error rate that certain paths is surveyed thinks then that all less than 1e-7 this channel signal transmission performance of conducting slip ring is good with the dynamic bit error rate, can be used.
Describedly select corresponding level agreement, be Transistor-Transistor Logic level agreement, CMOS level agreement, RS-232 level agreement, RS422 level agreement or RS-485 level agreement according to environment for use.
The corresponding baud rate of described selection, its baud rate scope is 9600 ~ 921600bps.
The beneficial effect that the present invention has is:
The present invention is applicable to the test and the application of the conducting slip ring of different application environment for the conducting slip ring signal transmission performance provides directly, reliably evaluation index and method of testing.
Description of drawings
Fig. 1 is an error rate test box structural drawing.
Fig. 2 is the error rate test system structural drawing.
Among the figure: 1.1, first SS, 1.2, second SS, 1.3, receiving end; 1.4, transmitting terminal, 1.5, communication unit, 1.6, central processing unit; 2.1, the error rate test box, 2.2, conducting slip ring, 2.3, transmitting terminal conducting slip ring port; 2.4, receiving end conducting slip ring port, 2.5, transmitting terminal relatively rotates body, 2.6, receiving end relatively rotates body.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further:
Fig. 1 is an error rate test box structural drawing, comprising: by two SSes 1.1,1.2, receiving end 1.3, transmitting terminal 1.4, central processing unit 1.6, communication unit 1.5 is formed; Receiving end 1.3 contains single ended interfaces and differential interface respectively with transmitting terminal 1.4, at first confirms that according to communications protocol transmitting terminal and receiving end are single-ended still differential ends during test.The transmitting terminal 1.4 of error rate test box links to each other with the same passage of conducting slip ring respectively with receiving end 1.3; First SS 1.1 of error rate test box is according to the corresponding level agreement of different choice of environment for use, like Transistor-Transistor Logic level, and CMOS level, RS-232 level, RS-485 level etc.; Second SS 1.2 of error rate test box is used to select the baud rate point identical with environment for use, and the baud rate scope is generally 9600 ~ 921600bps.Central processing unit 1.6 sends the series of features data, and characteristic can be incremental number, or pseudo random number; Through transmitting terminal 1.4, conducting slip ring 2.2; Transfer to the receiving end 1.3 of error rate test, central processing unit 1.6 compares data that receive and transmission data, judges whether to be error code; And judged result sent to host computer through communication unit 1.5, count the bit error rate by host computer.
Fig. 2 is the error rate test system structural drawing.Comprising: error rate test box 2.1; Conducting slip ring 2.2; Transmitting terminal conducting slip ring port 2.3, receiving end conducting slip ring port 2.4, transmitting terminal relatively rotates body 2.5; Receiving end relatively rotates body 2.6, and wherein conducting slip ring 2.2 relatively rotates body 2.5 through transmitting terminal and relatively rotates body 2.6 with receiving end.Error rate test box 2.1 and transmitting terminal conducting slip ring port 2.3 and receiving end conducting slip ring port 2.4 link to each other through corresponding interface.
Embodiment: the concrete grammar of testing conductive slip ring signal transmission performance is following:
(1) clear and definite environment for use condition: signal wire is single-ended in the communications protocol, and the level agreement is the RS422 level, and baud rate is 115200bps, and slip ring passage number is 6;
(2) according to above parameter, earlier receiving end 1.3 is linked to each other with a passage of conducting slip ring with transmitting terminal 1.4, first SS 1.1 is chosen as RS-422 level agreement, and it is 115200bps that second SS 1.2 is selected baud rate;
(3) transmitting terminal relatively rotates body 2.5 and receiving end to relatively rotate body 2.6 static relatively; 2.88e7 the incremental data that error rate test box 2.1 sent in 2 hours is through transmitting terminal 1.4; Conducting slip ring 2.2 relatively draws error code number 0, BER1=0 by receiving end 1.3 receptions and with the transmission data; In the turntable working range, select a slewing rate point; Make transmitting terminal relatively rotate body 2.5 and relatively rotate body 2.6 with receiving end and rotates continuously, consider the serviceable life of conducting slip ring 2.2, relatively rotate 1 °/s of the general selection of speed; 2.88e7 the incremental data that error rate test box 2.1 sent in 2 hours is through transmitting terminal 1.; Conducting slip ring 2.2 relatively draws error code number 2, BER2=6.9e-8 by the receiving end reception and with the transmission data;
(4) remaining each passage of conducting slip ring 2.2 is tested repeating step 1) ~ 3), test result such as following table;
(5) according to shown in the last table, the dynamic bit error rate of passage 2 is all above normal value.Passage 2 can't effectively transmit data as signal transmission passage.
Instance 2: the concrete grammar of testing conductive slip ring signal transmission performance is following:
(1) for same slip ring, environment for use is: passage 1,2 signal wire is a differential ends, and rest channels is single-ended, and the level agreement is the RS422 level, and baud rate is 115200bps;
(2) according to above parameter, earlier the differential ends interface of receiving end 1.3 and transmitting terminal 1.4 and the passage 1,2 of conducting slip ring 2.2 are linked to each other, first SS 1.1 is chosen as RS-422 level agreement, and it is 115200bps that second SS 1.2 is selected baud rate;
(3) transmitting terminal relatively rotates body 2.5 and receiving end to relatively rotate body 2.6 static relatively; 2.88e7 the incremental data that error rate test box 2.1 sent in 2 hours is through transmitting terminal 1.4; Conducting slip ring 2.2 relatively draws error code number 0, BER1=0 by receiving end 1.3 receptions and with the transmission data; In the turntable working range, select a slewing rate point; Two rotors are rotated with 1 °/s of relative rotation speed; 2.88e7 the incremental data that error rate test box 2.1 sent in 2 hours is through transmitting terminal 1.4; Conducting slip ring 2.2 relatively draws error code number 0, BER2=0 by receiving end 1.3 receptions and with the transmission data;
(4) receiving end 1.3 and transmitting terminal 1.4 single-ended links to each other with remaining each passage of conducting slip ring 2.2 successively and repeats step 3), test result such as following table;
(5) according to shown in the last table, all lane testing results are all normal, can be used as signal transmission passage transmission data.
Claims (3)
1. the method for a testing conductive slip ring signal transmission performance is characterized in that the step of this method is following:
1) transmitting terminal (1.4), the receiving end (1.3) with error rate test box (2.1) links to each other with receiving end conducting slip ring port (2.6) with the transmitting terminal conducting slip ring port (2.3) of the same passage of conducting slip ring (2.2) respectively; First SS (1.1) of error rate test box (2.1) is selected corresponding level agreement according to environment for use, and second SS (1.2) of error rate test box (2.1) is selected corresponding baud rate;
2) conducting slip ring (2.2) relatively rotates body (2.5), receiving end at transmitting terminal and relatively rotates body (2.4) when static relatively, opens error rate test box (2.1), records the static bit error rate;
3) conducting slip ring (2.2) transmitting terminal relatively rotate body (2.5) relatively receiving end relatively rotate body (2.4) when rotating continuously with 1 °/s speed, open error rate test box (2.1), record the dynamic bit error rate;
4) repeating step 1) ~ 3), each passage of conducting slip ring (2.2) is tested, record the static bit error rate and the dynamic bit error rate of each passage;
5) static bit error rate data that record each passage according to step 4) and dynamic bit error rate data if the static bit error rate that certain paths is surveyed thinks then that all less than 1e-7 this channel signal transmission performance of conducting slip ring is good with the dynamic bit error rate, can be used.
2. the method for a kind of testing conductive slip ring signal transmission performance according to claim 1; It is characterized in that: describedly select corresponding level agreement, be Transistor-Transistor Logic level agreement, CMOS level agreement, RS-232 level agreement, RS422 level agreement or RS-485 level agreement according to environment for use.
3. the method for a kind of testing conductive slip ring signal transmission performance according to claim 1 is characterized in that: the corresponding baud rate of described selection, its baud rate scope is 9600 ~ 921600bps.
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| CN2011103608744A CN102520267B (en) | 2011-11-15 | 2011-11-15 | Method for testing signal transmission performance of electric conductive slip ring |
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Cited By (7)
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| CN104655960A (en) * | 2015-02-09 | 2015-05-27 | 北京金风科创风电设备有限公司 | Detection device and method of electric slip ring |
| CN107396096A (en) * | 2017-08-29 | 2017-11-24 | 中国北方车辆研究所 | The method that digital signal transmission performance detection is carried out for conducting slip ring |
| CN108051677A (en) * | 2017-12-13 | 2018-05-18 | 杭州欣扬科技有限公司 | Slip ring signal transmission device for detecting performance and control method |
| CN108287799A (en) * | 2017-12-28 | 2018-07-17 | 深圳科瑞技术股份有限公司 | A kind of AGT data coupling process realized based on serial communication |
| CN109472972A (en) * | 2017-09-08 | 2019-03-15 | 新疆金风科技股份有限公司 | Electric slip ring fault detection method and device |
| CN113985750A (en) * | 2021-09-30 | 2022-01-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | Interface circuit board level integrated circuit board |
| CN114050875A (en) * | 2021-09-30 | 2022-02-15 | 中国兵器工业集团第二一四研究所苏州研发中心 | MAX3232 type RS-232 signal transceiver verification board |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655960A (en) * | 2015-02-09 | 2015-05-27 | 北京金风科创风电设备有限公司 | Detection device and method of electric slip ring |
| CN107396096A (en) * | 2017-08-29 | 2017-11-24 | 中国北方车辆研究所 | The method that digital signal transmission performance detection is carried out for conducting slip ring |
| CN109472972A (en) * | 2017-09-08 | 2019-03-15 | 新疆金风科技股份有限公司 | Electric slip ring fault detection method and device |
| CN108051677A (en) * | 2017-12-13 | 2018-05-18 | 杭州欣扬科技有限公司 | Slip ring signal transmission device for detecting performance and control method |
| CN108051677B (en) * | 2017-12-13 | 2020-02-14 | 杭州欣扬科技有限公司 | Slip ring signal transmission performance detection device and control method |
| CN108287799A (en) * | 2017-12-28 | 2018-07-17 | 深圳科瑞技术股份有限公司 | A kind of AGT data coupling process realized based on serial communication |
| CN113985750A (en) * | 2021-09-30 | 2022-01-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | Interface circuit board level integrated circuit board |
| CN114050875A (en) * | 2021-09-30 | 2022-02-15 | 中国兵器工业集团第二一四研究所苏州研发中心 | MAX3232 type RS-232 signal transceiver verification board |
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