CN112533164A - Method for improving transmission bandwidth of vibration data in reliability test - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 230000005540 biological transmission Effects 0.000 title claims abstract description 22
- 238000007906 compression Methods 0.000 claims abstract description 32
- 230000006835 compression Effects 0.000 claims abstract description 32
- 230000006837 decompression Effects 0.000 claims abstract description 21
- 230000035945 sensitivity Effects 0.000 claims description 12
- 230000001133 acceleration Effects 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims 1
- 238000013144 data compression Methods 0.000 abstract description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0014—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the source coding
Abstract
The invention discloses a method for improving transmission bandwidth of vibration data in reliability test, and belongs to the technical field of data compression algorithm and data transmission. The hardware adopted by the method comprises a sensor, a collector, a network interface and an upper computer; the collector comprises a collecting card, a cache and a compression algorithm module; the upper computer comprises a database and a decompression algorithm module; the acquisition card firstly transmits original voltage value data in the sensor to a cache of a collector, and the voltage value data is compressed into a data packet through a compression algorithm module; then the data packet is transmitted to a decompression algorithm module of the upper computer through a network interface; and finally, a decompression algorithm module in the upper computer decodes the source data and stores the source data into a database. The invention can improve the data transmission bandwidth by more than one time, thereby reducing the probability of failure in the data transmission process and ensuring the successful implementation of the reliability test.
Description
Technical Field
The invention relates to a method for improving transmission bandwidth of vibration data in reliability test, belonging to the technical field of data compression algorithm and data transmission.
Background
The reliability test is an important link of reliability work, and a part which is very important in the reliability test is a vibration test. At present, data used for collecting vibration data in vibration test practice is 64-bit double-precision floating point type data, and single data occupies 8Bytes in a memory. Generally, the number of sensors of one collector is 64, the sampling frequency is 5120HZ, and the data generated by a single sensor in 1 second reaches 40.96KB, so that the data amount of a single collector in 1 second reaches 2.62MB, that is, the network transmission speed is required to stably reach 2.62M/s, namely 20.971 Mbit/s. If the speed is only one, the hundred-megabyte network card can easily cope with the speed, however, in the practice of vibration testing, 7-24 hours of uninterrupted work is needed, the heavier the network card is, the more unstable the situation is easily caused, and then the more easily data backlog is caused or the transmission interruption is caused to cause test failure; it is important to increase the data transmission bandwidth.
The following two methods are mainly used to increase the bandwidth at present: firstly, hardware facilities are improved, for example, gigabit equipment such as gigabit network cards and gigabit routers are used for replacing common hundred-megabyte equipment; and secondly, the data is compressed by adopting a general compression algorithm, so that more data can be transmitted under the condition of keeping the data transmission speed unchanged. However, the first method is costly, since the replacement equipment is subjected to equipment procurement, old equipment disassembly, new equipment installation and debugging and other steps, the time, financial resources and labor costs are greatly increased; the second method adopts a general data compression method in the process of compressing data, does not grasp the characteristics of vibration data, and is only simple data multiplexing, so that effective compression is difficult to perform under the condition that a large amount of data are mutually unequal, and the compression ratio is unstable when a general algorithm compresses the vibration data.
The reliability test has high cost and long time consumption, and any fault in the transmission process can cause the failure of the whole test process; in the prior art, the bandwidth required for transmitting the vibration data is high, and the probability of generating faults during long-time uninterrupted work is high.
Disclosure of Invention
In view of this, the present invention provides a method for increasing a data transmission bandwidth in a reliability test, which can increase the data transmission bandwidth by more than one time, thereby reducing the probability of a failure in the data transmission process and ensuring the successful performance of the reliability test.
A method for improving vibration data transmission bandwidth in reliability test adopts hardware comprising a sensor, a collector, a network interface and an upper computer;
the collector comprises a collecting card, a cache and a compression algorithm module;
the upper computer comprises a database and a decompression algorithm module;
the method comprises the following steps:
the method comprises the following steps: the acquisition card transmits the original voltage value data in the sensor to a cache of the acquisition card, and the voltage value data is compressed into a data packet through a compression algorithm module;
step two: the data packet is transmitted to a decompression algorithm module of the upper computer through a network interface;
step three: and the decompression algorithm module of the upper computer decodes the source data and stores the source data into the database.
Furthermore, the compression algorithm module packs a group of original data, and records each original data by using the ratio of the modulus of the original data to the maximum modulus in the group of data, wherein the number of occupied bits is equal to the resolution of the collector; the original data always has the character of alternating sign, the sign bit of the original data is directly removed, and the sign is restored according to the alternating relation during the decompression algorithm.
Further, the decompression algorithm module analyzes and restores the data packed by the compression algorithm, firstly analyzes the maximum value, the sensitivity, the initial value symbol and the data volume in the group of data, then takes out all recorded ratio values according to the data volume and the sensitivity, then restores the modulus of the original data by using the ratio values and the maximum value, and finally sequentially solves the symbols of all the data according to the initial value symbol and the symbol alternating property.
Further, the process of finding all data symbols in the decompression algorithm module includes:
step a), obtaining the left derivative Dleft at the point1D1-D0, right derivative Dright1D2-D1, and the data packet is DM; the first number after analysis is D0, and the second number is D1, … … Dn;
step b), when Dleft1<0 and Dright1>When the sign is 0, the signs from D1 to D2 are changed, and sign change operation sign is carried out on sign; in other cases, sign is unchanged;
in step c), D1 is obtained as sign | D1 |.
Furthermore, the sensor is used for measuring vibration acceleration in a vibration test, the sensor returns a voltage value to the acquisition card according to the vibration of the sensor, and the acquisition card is installed on the acquisition card.
Has the advantages that:
1. the invention realizes data lossless compression according to the sensitivity of the collector, the compression ratio of the compression algorithm is related to the sensitivity of the collection card, and the determined compression ratio is related to the determined sensitivity and is unrelated to the data, so the compression ratio is stable.
2. The invention carries out specific data decompression aiming at the characteristic of continuous alternation of vibration data, the compression algorithm specially carries out calculation aiming at the vibration data, and the core idea of the compression algorithm is essentially different from that of the general algorithm, so the compression of the general compression algorithm can be carried out after the compression of the algorithm is finished, thereby obtaining higher compression ratio.
Drawings
FIG. 1 is a graph of device vibration data;
FIG. 2 is a schematic diagram of the hardware components of the present invention;
FIG. 3 is a data structure diagram of a compression algorithm;
fig. 4 is a schematic diagram of the sign-alternating positions of the vibration function image.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a method for improving transmission bandwidth of vibration data in a reliability test, which aims at the vibration data shown in figure 1, wherein figure 1 is a function image of a component of acceleration in an x direction with respect to time; the image is clear, and the relation between the component of the vibration acceleration in any direction and the time has the characteristic of positive and negative alternation in the vibration test.
As shown in fig. 2, the hardware adopted in the method of the present invention includes a sensor, a collector, a network interface and an upper computer; the collector comprises a collection card, a cache and a compression algorithm module, and the upper computer comprises a database and a decompression algorithm module;
the sensor is used for measuring vibration acceleration in a vibration test and can return a voltage value to the acquisition card according to the vibration of the sensor, and the acquisition card is installed on the acquisition card; the collector packs the data in the acquisition card by a compression algorithm module and then sends the data to the upper computer through the network port; and after receiving the data packet, the upper computer restores the data by using the decompression algorithm module and uploads the data to the database.
The compression algorithm module is realized by the steps of:
the first step is as follows: writing header information (0x0A 0x55) for identifying the start position of the packet;
the second step is that: write sensitivity, 0x01 for 16 bits, 0x02 for 32 bits;
the third step: writing in a first value symbol, and directly writing in a first number of sign bits of the source data; 0x00 represents '+', 0x01 represents '-';
the fourth step: writing the maximum value of the absolute value, calculating the maximum value by traversing the absolute value of the source data, writing in 8-byte Double type, and writing in | AmaxRepresents;
the fifth step: writing data quantity; traversing source data, counting the number N of the source data and writing the source data;
and a sixth step: writing data, taking a first number D of source data0Finding it from n0＝|D0|/|A|max*216A value of (d); then n is added0Value of (3) is written into D0In this way, n is obtained1＝|D1|/|A|max*216Then write Data1(ii) a And the like, all the data are written.
Assuming that the variable is terminated, the data packet read from the network interface is DM; the first number after analysis is D0, and the second number is D1, … … Dn; the left derivative of each number after analysis is DleftiThe right derivative value is DrightiWhere i is 0, 1, 2, … …, n;
the decompression algorithm module is implemented by the steps of:
the first step is as follows: taking two bytes, judging whether the two bytes are header information (0x0A 0x55), if the two bytes pass the judgment, indicating that the DM is a data packet of a decompression algorithm module, and analyzing the data packet, otherwise, indicating that the DM is not the data packet of the decompression algorithm module and does not analyze the data packet;
the second step is that: taking one byte, analyzing the byte into a short type of 8 bits, and setting the short type as sensi, so that the length of each piece of data is s-sensi 16;
the third step: taking one byte, resolving the byte into a short type of 8 bits, setting the byte as sn, determining a first sign according to the value of sn, wherein the sign is 1 when the sn is 0x00, and the sign is-1 when the sn is 0x 01;
the fourth step: eight bytes are taken, the byte type is analyzed into 64bit double type, and the byte type is set as | Amax；
The fifth step: taking eight bytes, analyzing the eight bytes into a 64-bit long type, and setting the type as N;
and a sixth step: s bits are taken and analyzed in an unsigned integer mode, and the bits are set as ds 0; calculating D0 sign | A | according to the compression algorithmmax*ds0/2s；
The seventh step: s bits are taken and still analyzed according to an unsigned integer mode, and the bits are set as ds 1; solving | D1| ═ A | according to a compression algorithmmax*ds1/2sThen, the sign is calculated, and all the values in the future are calculated and solved in sequence.
Wherein, the process of solving the symbol again comprises the following steps:
step a), obtaining the left derivative Dleft at the point1D1-D0, right derivative Dright1＝|D2|-|D1|；
Step b), when Dleft1<0 and Dright1>When the sign is 0, the signs from D1 to D2 are changed, and sign change operation sign is carried out on sign; in other cases, sign is unchanged;
in step c), D1 is obtained as sign | D1 |.
In actual objects and engineering structures, the mass and the elasticity of the system are continuously distributed, the system has 3 degrees of freedom, and the system can be generally simplified into a multi-degree-of-freedom vibration system in engineering test analysis. The differential equation for free vibration of an undamped system with 6 degrees of freedom can be derived from newton's second law to have the following form:
wherein: m is the mass matrix of the system, K is the stiffness matrix, x is the displacement vector,
is an acceleration vector; according to the theory of differential equations, its general solution satisfies the form:
it can be seen from the general solution that the displacement vector is a superposition of a plurality of sinusoidal functions. x (t) is a continuously derivable function and its second derivative has the same form as x (t). The acceleration-time function of the vibration is continuously derivable in form, i.e. the signal source of the vibration sensor is a continuously derivable function with respect to time. From the nature of the continuous function: the function has the left derivative equal to the reciprocal for each point.
When the compression algorithm is finished, the function x (t) is processed by the compression algorithm module to become | x (t) |, but the function | x (t) | is not a continuous function, and a discontinuous point is a position with alternating symbols; considering that the actual values are all discrete values, the left derivative and the right derivative of each point on the function in x (t) are not exactly equal, and their difference depends on the density of the samples; however, in the case that the sampling frequency is high enough, the left derivative of | x (t) | <0 indicates that the value on the left side of the point is decreasing, while the right derivative of | x (t) | at the point > -0 indicates that the right side is unchanged or increased, and the point is necessarily discontinuous, that is, the point is the point where the sign of the original function x (t) changes.
As shown in fig. 3, each given set of data is finally packed and compressed in the data structure shown in the figure. Head is the identification of packets, which is unique; the Sensitivity represents the Sensitivity, and takes values of 0x01 and 0x02, and corresponds to the sensitivities of 16bit and 32 bit; first Sign indicates the Sign of the First value in a given set of data, and takes values of 0x00 and 0x01, corresponding to the signs '+', '-', respectively; abs Max represents the maximum of the modulus in a given set of data; the total amount of data represents the amount of data for a given set of data; data0, Data1 … … represent the storage of a given set of Data.
When the sensitivity of the acquisition card is 16bit, 2 bytes are needed for storing one datum, the space can be saved by 75% compared with the currently used 8bytes datum, under the condition of compressing a large amount of data, the fixed length of 16bytes in the data structure can be ignored, and the bandwidth can be increased by 300%.
As shown in fig. 4, the left side is a function image of a certain direction component of the acceleration with respect to time t, which is used for comparing the relation between the vibration data and the time in the vibration test, wherein the positive and negative alternate points and the negative and positive alternate points are marked by black dots; the right image is the corresponding image after the left image is subjected to modulo operation and is used for comparing the image after the vibration data is compressed, and the small black dots in the image correspond to the small black dots in the left image. It can be seen from the figure that the left derivative of the compressed data is less than or equal to 0, and when the right derivative is greater than or equal to 0, the left derivative is the positive or negative or positive and negative alternative point of the original function.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for improving vibration data transmission bandwidth in reliability test is characterized in that hardware adopted by the method comprises a sensor, a collector, a network interface and an upper computer;
the collector comprises a collecting card, a cache and a compression algorithm module;
the upper computer comprises a database and a decompression algorithm module;
the method comprises the following steps:
the method comprises the following steps: the acquisition card transmits the original voltage value data in the sensor to a cache of the collector, and the voltage value data is compressed into a data packet through a compression algorithm module;
step two: the data packet is transmitted to a decompression algorithm module of the upper computer through a network interface;
step three: and the decompression algorithm module of the upper computer decodes the source data and stores the source data into the database.
2. The method for improving transmission bandwidth of vibration data in reliability test according to claim 1, wherein the compression algorithm module packs a group of original data, and records each original data by using the ratio of the modulus of the original data to the maximum modulus of the group of data, and the number of occupied bits is equal to the resolution of the collector; the original data always has the character of alternating sign, the sign bit of the original data is directly removed, and the sign is restored according to the alternating relation during the decompression algorithm.
3. The method for improving transmission bandwidth of vibration data in reliability test according to claim 1 or 2, wherein the decompression algorithm module analyzes and restores the data packed by the compression algorithm, first analyzes the maximum value, the sensitivity, the first value symbol and the data volume in the group of data, then extracts all recorded ratio values according to the data volume and the sensitivity, then restores the modulus of the original data by using the ratio values and the maximum value, and finally sequentially finds out the symbols of all data according to the first value symbol and the symbol alternation property.
4. The method for increasing transmission bandwidth of vibration data in reliability test as claimed in claim 3, wherein said process of finding all data symbols in said decompression algorithm module comprises:
step a), obtaining the left derivative Dleft at the point1D1-D0, right derivative Dright1D2-D1, and the data packet is DM; the first number after analysis is D0, and the second number is D1, … … Dn;
step b), when Dleft1<0 and Dright1>When the sign is 0, the signs from D1 to D2 are changed, and sign change operation sign is carried out on sign; in other cases, sign is unchanged;
in step c), D1 is obtained as sign | D1 |.
5. The method according to claim 4, wherein the sensor is a sensor for measuring vibration acceleration in a vibration test, the sensor transmits back a voltage value to an acquisition card according to its own vibration, and the acquisition card is installed on the acquisition card.
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