CN112563842B - Simulation method for data transmission of conductive slip ring - Google Patents
Simulation method for data transmission of conductive slip ring Download PDFInfo
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- CN112563842B CN112563842B CN202011517343.7A CN202011517343A CN112563842B CN 112563842 B CN112563842 B CN 112563842B CN 202011517343 A CN202011517343 A CN 202011517343A CN 112563842 B CN112563842 B CN 112563842B
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- slip ring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/08—Slip-rings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/10—Manufacture of slip-rings
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Abstract
The invention relates to a simulator for simulating a spatial conductive slip ring, comprising: an analog-to-digital converter configured to acquire an analog voltage signal from the spatial conducting slip ring and convert it to a digital voltage signal; a memory configured to store the digital voltage signal; and a digital-to-analog converter configured to read the stored digital voltage signal and convert it to an analog voltage signal. The invention also relates to a method for simulating a spatial conductive slip ring. Through the simulator and/or the method, the phenomenon that the space conductive slip ring rotates all the time in the satellite simulation test can be avoided, so that the number of residual turns of the space conductive slip ring is increased, the service life of the space conductive slip ring is prolonged, and in addition, the use of the real space conductive slip ring can be reduced or even avoided in the space conductive slip ring test, so that the test cost is reduced.
Description
Technical Field
The invention relates to the field of spacecraft testing in general, and particularly relates to a simulator for simulating a space conductive slip ring. The invention further relates to a method for simulating a spatial conductive slip ring.
Background
At present, the number of in-orbit spacecrafts exceeds one thousand, and satellites which do not carry scientific instruments and equipment originally are developed into space stations with complex functions, deep space landers and the like. In order to adapt to complex scenes or complete specific tasks, the mechanical mechanisms of the spacecraft are required to rotate relatively, and in order to ensure that data can be transmitted between the relatively rotating spacecraft devices, a space conductive slip ring is required to be used for establishing an electric path for data transmission between the relatively moving devices.
The space conductive slip ring mainly comprises two parts, wherein one part is a fixed conductive ring and is connected with one of two mechanisms which move relatively, and the other part is an electric brush and is connected with the other mechanism of the two mechanisms. When the two mechanisms rotate relatively, the electric brush keeps sliding electric contact on the conducting ring to ensure that the conducting signal is not lost, so that data transmission between the two mechanisms rotating relatively is realized.
The space conductive slip ring has the advantages of reliable signal transmission, high transmission speed and the like, can transmit data signals and electric energy, and is widely used on the rotary spacecraft. However, the spatial conductive slip ring has a disadvantage of short service life because the brush and the conductive ring are worn and shortened after a long contact friction time, and abrasion particles are generated to affect the performance of the conductive slip ring. The space conductive slip ring is mostly a single point, so the space conductive slip ring has no backup after being damaged, and the spacecraft can not work normally, so the space conductive slip ring becomes one of the key limited factors of the service life of the space spacecraft.
The service life of the space conductive slip ring is measured by the number of rotation turns, and the service life can be statistically estimated through a ground service life test of the conductive slip ring and existing on-track use records. In order to ensure that the conductive slip ring has longer service life in space, the effective method is to reduce the rotation number of the conductive slip ring during the ground test of the spacecraft. However, in order to simulate a real signal transmission environment in the ground test process, when a signal transmission test of a relative rotation mechanism is performed, the conductive slip ring is usually in a rotation working state, and particularly when a ground spacecraft aging test and a signal transmission pressure test are performed, the number of residual rotatable turns of the conductive slip ring is reduced through a long-time test, so that the service life of the conductive slip ring in an in-orbit state is correspondingly reduced, and the service life of the spacecraft in the in-orbit state is shortened.
In addition, when the ground conducts communication test research on the space conductive slip ring, in order to verify the influence of the space conductive slip ring on different communication methods, different communication protocols such as RS422, CAN, RS485 and the like and different baud rates under different protocols are often required to conduct long-time pressure test, and in order to simulate a real working state, the space conductive slip ring needs to be rotated so as to generate level fluctuation in a transmission signal when the conductive slip ring rotates. The method needs to invest a large amount of expensive space conductive slip rings for testing, and the testing cost is high.
Therefore, a simulator capable of simulating data transmission of the conductive slip ring is needed, and when only a signal transmission process of the conductive slip ring needs to be simulated, the simulator replaces a real slip ring to participate in a test, so that the use of the real conductive slip ring is reduced, the service life of the conductive slip ring is prolonged, or the test cost is reduced.
Disclosure of Invention
The invention aims to provide a simulator for simulating a space conductive slip ring and a corresponding simulation method, and the simulator and/or the method can prevent the space conductive slip ring from rotating all the time in a satellite simulation test, so that the number of residual turns of the space conductive slip ring is increased, the service life of the space conductive slip ring is prolonged, and in addition, the use of a real space conductive slip ring can be reduced or even avoided in the space conductive slip ring test, so that the test cost is reduced.
In a first aspect of the invention, this task is solved by a simulator for simulating a spatially conducting slip ring, comprising:
an analog-to-digital converter configured to acquire an analog voltage signal from the spatial conducting slip ring and convert it to a digital voltage signal;
a memory configured to store the digital voltage signal; and
a digital-to-analog converter configured to read the stored digital voltage signal and convert it to an analog voltage signal.
In a preferred embodiment of the present invention, it is provided that the analog voltage signals include a first analog voltage signal of the space conducting slip ring in a rotating state and a second analog signal of the space conducting slip ring in a static state, wherein the first analog voltage signal is converted into a first digital voltage signal by an analog-to-digital converter, and the second analog voltage signal is converted into a second digital voltage signal by the analog-to-digital converter, and wherein the simulator further includes:
a signal processor configured to subtract the second digital voltage signal from the first digital voltage signal to obtain a voltage fluctuation digital signal.
Through the preferred scheme, voltage fluctuation of the space conductive slip ring during rotation can be well simulated. The brush and the conducting ring of the spatial conducting slip ring can cause the contact resistance of the brush and the conducting ring to fluctuate during sliding friction, and other noises are introduced and reflected on the level of a transmission signal to show the fluctuation of the transmission level, thereby influencing the quality of the transmission signal. Therefore, the noise generated when the spatial conductive slip ring rotates is superposed on the transmission line, so that the real conductive slip ring in signal transmission can be simulated.
In one embodiment of the invention, it is provided that the simulator further comprises an adder configured to superimpose the analog voltage signal output by the digital-to-analog converter on the signal line to simulate the voltage of the spatial conductive slip ring. By means of this embodiment, an analog voltage signal, for example a voltage ripple analog signal, can be superimposed into the test signal in a simple and cost-effective manner in order to simulate a spatially conducting slip ring.
In a second aspect of the invention, the aforementioned object is achieved by a method for simulating a spatially conducting slip ring, comprising the following steps:
acquiring a first analog voltage signal of the space conductive slip ring in a rotating state from the space conductive slip ring and converting the first analog voltage signal into a first digital voltage signal through analog-to-digital conversion;
acquiring a second analog voltage signal of the space conductive slip ring in a rotating state from the space conductive slip ring and converting the second analog voltage signal into a second digital voltage signal through analog-to-digital conversion;
subtracting the second digital voltage signal from the first digital voltage signal to obtain a voltage fluctuation digital signal;
storing the voltage fluctuation digital signal;
reading the voltage fluctuation digital signal and converting the voltage fluctuation digital signal into a voltage fluctuation analog signal through digital-to-analog conversion; and
and superposing the voltage fluctuation analog signal to a signal line so as to simulate the voltage of the space conductive slip ring.
In one embodiment of the invention, it is provided that the method further comprises:
the first digital voltage signal and the second digital voltage signal are stored.
With this embodiment, the voltages of the spatial conducting slip ring in various states can be stored for use in different simulation tests or simulation targets.
In a preferred embodiment of the invention, it is provided that the method further comprises:
the analog voltage signals of the space conductive slip ring at different rotating speeds are collected from the space conductive slip ring and are converted into corresponding digital voltage signals through analog-to-digital conversion.
Through the expansion scheme, the electric output signals of the space conductive slip ring at different rotating speeds can be simulated.
Drawings
The invention is further elucidated with reference to specific embodiments in the following description, in conjunction with the appended drawings.
FIG. 1 shows a schematic diagram of a simulator for simulating a spatial conducting slip ring according to the invention;
FIG. 2 shows a schematic diagram of a simulator according to the invention in a signal acquisition mode; and
fig. 3 shows a schematic diagram of a simulator according to the invention in a simulation test mode.
Detailed Description
It should be noted that the components in the figures may be exaggerated and not necessarily to scale for illustrative purposes. In the figures, identical or functionally identical components are provided with the same reference symbols.
In the present invention, "disposed on …", "disposed over …" and "disposed over …" do not exclude the presence of an intermediate therebetween, unless specifically indicated otherwise. Further, "disposed on or above …" merely indicates a relative positional relationship between the two components, and may also be converted to "disposed below or below …" and vice versa in certain cases, such as after reversing the product direction.
In the present invention, the embodiments are only intended to illustrate the aspects of the present invention, and should not be construed as limiting.
In the present invention, the terms "a" and "an" do not exclude the presence of a plurality of elements, unless otherwise specified.
It is further noted herein that in embodiments of the present invention, only a portion of the components or assemblies may be shown for clarity and simplicity, but those of ordinary skill in the art will appreciate that, given the teachings of the present invention, required components or assemblies may be added as needed for a particular situation.
It is also to be noted here that, within the scope of the present invention, the expressions "identical", "equal" and the like do not mean that the two values are absolutely equal, but allow a certain reasonable error, that is, the expressions also cover "substantially identical", "substantially equal".
The numbering of the steps of the methods of the present invention does not limit the order in which the method steps are performed. Unless specifically stated, the method steps may be performed in a different order.
In order to reduce the use of the real space conductive slip ring in a ground data transmission test, the invention provides a simulator for simulating the space conductive slip ring, which can replace the space conductive slip ring on the ground to perform a data transmission test, reduce the use of the real slip ring, prolong the on-orbit working life of the real slip ring and reduce the research cost of the ground test.
The simulator acquires the voltage of a transmission signal in the rotation process of a real conductive slip ring through AD (analog-digital) conversion, extracts the fluctuation voltage in the acquired signal by using a signal processor, and stores the fluctuation voltage in an internal memory of the simulator. When a simulator is required to be used for data transmission testing, the controller controls DA (digital-analog) conversion to read a fluctuating voltage value from the memory and convert the fluctuating voltage value into an analog signal voltage, and the analog signal voltage is superposed on the signal voltage to be tested through the summator, so that voltage fluctuation in the rotating process of the space conductive slip ring is simulated on the signal voltage.
Fig. 1 shows a schematic diagram of a simulator 100 for simulating a spatially conducting slip ring according to the invention.
As shown in fig. 1, the composition includes: an interaction port a-C, AD converter 103, an optional signal processor 104, a memory 102, a DA converter 101, an optional adder 106, and an optional controller 106. In practice, the spatial conductive slip ring may have multiple paths, and for simplicity, only two paths of conductive slip rings corresponding to the ports a and B are shown in fig. 1, and the number of interacting ports and the adder 106 may be increased in practical use according to practical situations.
The interaction ports have three in total: port a, port B, port C. The port A and the port B are used as external communication ends during actual communication, and the port C is used for collecting noise during rotation of the real conductive slip ring.
The AD converter 103 may be configured to collect a voltage across the conductive slip ring, for example, collect a voltage across a communication line when the conductive slip ring rotates, so that a signal voltage fluctuation caused by the rotation of the conductive slip ring may be obtained through a subsequent process. In order to obtain finer fluctuation details, the AD sampling frequency is increased as much as possible, and meanwhile, in order to obtain more accurate voltage values, the AD acquisition bit number is increased as much as possible. The range of the AD acquisition can be selected according to the transmission signal.
The signal processing module 104 is responsible for filtering out the signal voltage from the signal superimposed with noise, which is extracted. Since the signal voltage is a rectangular wave when transmitting a signal, it is difficult to obtain accurate transmission noise using the method of spectral filtering. For this reason, in the present invention, the AD converter 101 is used to collect the signals of the same transmission signal in the case of rotating and non-rotating of the spatial conductive slip ring, and the collected voltage when the conductive slip ring rotates is used to subtract the voltage when the conductive slip ring does not rotate, so as to obtain the noise caused by the rotation of the conductive slip ring.
The memory 102 may be used to store digital voltage signals, for example, noise voltage signals during one rotation of the spatial conductive slip ring, so as to output the stored noise voltage signals to the DA converter 101 during the analog test.
The DA converter 101 performs a function of converting a digital signal into an analog signal, for example, reading a voltage signal stored in a memory, such as a noise voltage signal, in cycles, and then converting the voltage signal into an analog voltage to be output to the adder 106 of the corresponding line. In order to ensure that the output signal is not distorted, the conversion bit number and the conversion frequency of the DA converter are improved as much as possible.
The adder 106 realizes superposition of noise voltage and signal voltage, so that the signal voltage on the transmission line has the characteristic of the space conductive slip ring during rotation, and the effect of simulating a real space conductive slip ring is achieved.
The controller 105 can control the operation of the modules and devices to ensure that the functions of the modules and devices are correctly realized and the time sequence is correct. The controller 105 is optional and may be implemented either separately as respective control functions in the respective components or collectively as a control module. The controller 105 may be implemented in hardware, software, firmware, or a combination thereof.
Simulator 100 may include two modes, a first signal acquisition mode and a second simulation test mode. Fig. 2 and 3 show schematic diagrams of a simulator according to the invention in a signal acquisition mode and a simulation test mode, respectively, with dashed boxes representing inoperative components.
The signal acquisition mode is used for acquiring, processing and storing noise signals of the space conductive slip ring in the rotating process, and the connection is shown as a solid line in fig. 2, and only the port C, AD converter 101, the signal processor 104, the memory 102 and the controller 105 in the simulator 100 are in an operating state. In order to collect voltage signals on the rotating conductive slip ring, a mechanical device capable of enabling the conductive slip ring to rotate is arranged outside the rotating conductive slip ring. The inner ring of the conductive slip ring comprises a conductive ring and is fixedly arranged on a motor bearing, the outer ring of the conductive slip ring comprises an electric brush and is fixedly arranged on a slip ring support, a communication end 1 and a communication end 2 are respectively connected to the outer ring and the inner ring of the conductive slip ring, and an input line of a port C is respectively lapped on a transmission line of the communication end. Firstly, setting the rotation rate of a motor according to the rotation rate when the conductive slip ring is actually used, starting signal transmission of a communication end 1 and a communication end 2, and acquiring a voltage signal within a period T of rotation of the conductive slip ring by an AD (analog-to-digital) system; then, the motor stops rotating, the signal end transmits the same signal, and the AD acquires a voltage signal within the time T. The signal processor processes the signals at the two ends, subtracts the acquired signal from the first acquired signal to obtain an error signal, and puts the final result into the memory 102.
The simulation test mode is used for reading the signal acquired in the signal acquisition mode, converting the signal into a simulation voltage, superimposing the simulation voltage on the signal line 107 to simulate the signal transmitted when the real conductive slip ring rotates, and the connection is shown as a solid line in fig. 3, at this time, only the memory 102, the controller 105, the adder 106, the port a and the port B in the simulator 100 are in a working state. The controller controls DA converter 101 to read the stored noise voltage value from memory 102, convert the noise voltage value into an analog voltage, and output the analog voltage to adder 106 on the corresponding line, according to the sampling time T as a period, that is, the time for spatial conductive slip ring to rotate for one circle as a period. The adder 106 superimposes the noise voltage on the data transmission voltage transmitted by the communication terminal 1 and the communication terminal 2, so that the effect of simulating real-space conductive slip ring data transmission is realized.
Although some embodiments of the present invention have been described herein, those skilled in the art will appreciate that they have been presented by way of example only. Numerous variations, substitutions and modifications will occur to those skilled in the art upon the teachings of the present invention without departing from the scope thereof. It is intended that the following claims define the scope of the invention and that methods and structures within the scope of these claims and their equivalents be covered thereby.
Claims (2)
1. A method of simulating data transmission in a conductive slip ring, comprising the steps of:
according to a preset period, controlling a digital-to-analog converter to read a preset noise voltage value from a memory through a controller, and converting the preset noise voltage value into an analog voltage for output; and
and superposing the analog voltage output to a data transmission voltage transmitted by a communication terminal through an adder, wherein a preset noise voltage value is stored in a memory according to the following steps:
a device connection, comprising:
the outer ring and the inner ring of the spatial conductive slip ring are respectively connected with a communication end 1 and a communication end 2; and
the input end of the analog-to-digital converter is lapped on a transmission line on the communication end;
the motor drives the space conductive slip ring to rotate at a rotating speed in actual use;
starting signal transmission of the communication end 1 and the communication end 2, acquiring voltage signals in a preset period through an analog-to-digital converter, and converting the voltage signals into first digital voltage signals;
stopping the rotation of the motor, keeping the signal transmission of the communication end 1 and the communication end 2 unchanged, collecting a voltage signal in a preset period through an analog-to-digital converter, and converting the voltage signal into a second digital voltage signal; and
the second digital voltage signal is subtracted from the first digital voltage signal by the signal processor to obtain a noise voltage value, and the noise voltage value is stored in a memory.
2. The simulation method of claim 1, wherein the predetermined period is a time of one rotation of the spatial conductive slip ring.
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| CN202011517343.7A CN112563842B (en) | 2019-01-31 | 2019-01-31 | Simulation method for data transmission of conductive slip ring |
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| CN202011517343.7A CN112563842B (en) | 2019-01-31 | 2019-01-31 | Simulation method for data transmission of conductive slip ring |
| CN201910095981.5A CN109795725B (en) | 2019-01-31 | 2019-01-31 | Simulator for simulating space conductive slip ring and corresponding simulation method |
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| SU760467A2 (en) * | 1978-05-10 | 1980-08-30 | Yurij P Ryshkov | Device for synchronizing noise-like signals |
| CN1257351A (en) * | 1998-12-14 | 2000-06-21 | 阿尔卡塔尔公司 | Electronic digital-to-analog converter circuit for baseband transmission system |
| CN102024314A (en) * | 2009-09-16 | 2011-04-20 | 中国科学院沈阳自动化研究所 | Method and device for replacing rotating platform signal slip ring |
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| CN109795725B (en) | 2020-11-24 |
| CN109795725A (en) | 2019-05-24 |
| CN112563842A (en) | 2021-03-26 |
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