CN114689900A - Sensitivity dynamic compensation method and device of high-temperature acceleration sensor - Google Patents
Sensitivity dynamic compensation method and device of high-temperature acceleration sensor Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
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Abstract
The invention discloses a sensitivity dynamic compensation method and a sensitivity dynamic compensation device of a high-temperature acceleration sensor, wherein the method comprises the steps of establishing a temperature-sensitivity database of the high-temperature acceleration sensor; collecting an acceleration signal and a temperature signal; searching the sensitivity of the acceleration sensor at the corresponding temperature in a database; comparing the searched sensitivity value with the sensitivity value set by the peripheral instrument to obtain a compensation coefficient; compensating the acceleration sensor signal; outputting the compensated acceleration sensor signal; the sensitivity dynamic compensation device comprises an upper computer, a single board computer and a signal interface box; according to the method and the device, the signals of the high-temperature acceleration sensor can be dynamically compensated according to the temperature change, so that accurate measured values of the high-temperature acceleration sensor can be obtained in a vibration environment with fixed temperature or variable temperature; meanwhile, the device is simple, few in modules, easy to install and convenient to maintain.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a sensitivity dynamic compensation method and a sensitivity dynamic compensation device of a high-temperature acceleration sensor.
Background
The acceleration sensor is widely applied to acceleration and impact measurement in the industries of aerospace, weaponry, automation, automobiles and the like. In the temperature-vibration composite environment test, the high-temperature acceleration sensor is an essential means for measuring the vibration acceleration in the high-temperature environment. Although the heat resistance and frequency characteristics of the high-temperature acceleration sensor are improved with the development of technology. At present, although the high-temperature acceleration sensor can bear the highest temperature of more than 700 ℃, the frequency characteristic can reach 10 kHz. However, under different temperature environments, the sensitivity difference of the high-temperature acceleration sensor is large.
At present, the mature vibration controllers or data acquisition and analysis system products at home and abroad adopt a fixed sensitivity mode in software parameter setting and control algorithms.
Because the high-temperature acceleration sensor has larger difference of sensitivity at different temperatures and the vibration controller and the data acquisition and analysis system set a single fixed sensitivity value, in a temperature-vibration composite environment test adopting the high-temperature acceleration sensor as control feedback, the vibration magnitude is too large or too small, and an undertest or an over-test is caused; if the high temperature acceleration sensor is used as a measurement signal, the measurement acceleration will be inaccurate.
Therefore, it is necessary to develop a method and a device for dynamically compensating the sensitivity of a high-temperature acceleration sensor to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems and designs a sensitivity dynamic compensation method and a sensitivity dynamic compensation device for a high-temperature acceleration sensor.
The invention realizes the purpose through the following technical scheme:
a sensitivity dynamic compensation method of a high-temperature acceleration sensor comprises the following steps:
s1, establishing a temperature-sensitivity database of the high-temperature acceleration sensor;
s2, acquiring an acceleration signal and a temperature signal;
s3, searching the sensitivity of the acceleration sensor at the corresponding temperature in a database;
s4, comparing the searched sensitivity value with the sensitivity value set by the peripheral instrument to obtain a compensation coefficient;
s5, compensating the acceleration sensor signal;
and S6, outputting the compensated acceleration sensor signal.
Specifically, in step S1, an hermite interpolation method is used to perform interpolation fitting on the discrete "temperature-sensitivity" values to obtain a relatively continuous "temperature-sensitivity" curve, and a "temperature-sensitivity" database of the high-temperature acceleration sensor is established.
Specifically, in step S4, the compensation coefficient is r,
a (mV/g) is a sensitivity value set by a peripheral instrument, and b (mV/g) is a sensitivity value searched in a database; in step S5, the compensated acceleration sensor signal is rx (mv), and x (mv) is the collected acceleration signal.
The sensitivity dynamic compensation device of the high-temperature acceleration sensor comprises an upper computer, a single-board computer and a signal interface box, wherein a temperature signal and an acceleration signal are input into the signal interface box, the upper computer is connected with the single-board computer, and the single-board computer is connected with the signal interface box.
The invention has the beneficial effects that:
according to the method, the signals of the high-temperature acceleration sensor can be dynamically compensated according to the temperature change, and the accurate measurement value of the high-temperature acceleration sensor can be obtained under the vibration environment with fixed temperature or variable temperature; meanwhile, the device is simple, few in modules, easy to install and convenient to maintain.
Drawings
FIG. 1 is a schematic structural diagram of a sensitivity dynamic compensation device of a high-temperature acceleration sensor according to the present invention;
fig. 2 is a flowchart of a sensitivity dynamic compensation method of a high-temperature acceleration sensor according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" and the like are to be broadly construed, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following describes in detail embodiments of the present invention with reference to the drawings.
As shown in fig. 2, a method for dynamically compensating the sensitivity of a high-temperature acceleration sensor includes the following steps:
s1, establishing a high-temperature acceleration sensor temperature-sensitivity database;
s2, acquiring an acceleration signal and a temperature signal;
s3, searching the sensitivity of the acceleration sensor at the corresponding temperature in a database;
s4, comparing the searched sensitivity value with the sensitivity value set by the peripheral instrument to obtain a compensation coefficient;
s5, compensating the acceleration sensor signal;
and S6, outputting the compensated acceleration sensor signal.
In step S1, an hermitian interpolation method is used to perform interpolation fitting on the discrete "temperature-sensitivity" values to obtain a relatively continuous "temperature-sensitivity" curve, and a "temperature-sensitivity" database of the high temperature acceleration sensor is established.
The Hermite (Hermite) interpolation described above is characterized by making the function of the interpolating polynomial the same as the original function value, and the derivative values of the first order to the specified order of the interpolating polynomial equal to the corresponding order derivative values of the interpolated function. The Hermite interpolation method combines the derivative value of the function, so that the curve is smoother, and the interpolation precision is higher.
The number of nodes is arbitrary, and the hermitian interpolation with one derivative value is as follows:
to satisfy the condition G (x)i)＝f(xi) (i is 0,1,2, … n) and G' (x)i)＝f’(xi) The interpolation polynomial g (x). From the above conditions, G (x) passes through the point (x)0，f(x0))，(x1，f(x1))，(x2，f(x2))，…，(xn，f(xn)). Therefore, the method can obtain:
G(x)＝f(x0)+f[x0,x1](x-x0)+f[x0,x1,x2](x-x0)(x-x1)+…+f[x0,x1,x2,…,xn](x-x0)(x-x1)…(x-xn-1)+A(x-x0)(x-x1)…(x-xn)
where A is a coefficient of determinism that can be determined by the condition G' (x)1)＝f’(x1) Determining, by calculation:
wherein:
B＝f’(xi)-f[x0,x1]-f[x0,x1,x2](x1-x0)-…-f[x0,x1,x2,…,xn](x1-x0)(x1-x1)…(x1-xn-1)
the method for comparing the searched sensitivity value with the sensitivity value set by the peripheral instrument to obtain the compensation coefficient and then compensating the acquired acceleration sensor signal comprises the following steps:
and setting the signal of the acceleration sensor to be x (mV), setting the sensitivity value of a (mV/g) by a peripheral instrument, and setting the sensitivity value searched in the database to be b (mV/g). The compensation factor is then r and the compensation factor is,
after the signal x (mV) of the high-temperature acceleration sensor is subjected to r-time adjustment through a compensation device, the signal x (mV) is changed into rx (mV) and then is transmitted to a peripheral instrument; and x (mV) is the collected acceleration signal.
As shown in fig. 1, a sensitivity dynamic compensation device of a high-temperature acceleration sensor includes an upper computer, a single board computer, a signal interface box, and a temperature signal and acceleration signal input signal interface cabinet, wherein the upper computer is connected with the single board computer, and the single board computer is connected with the signal interface box. The upper computer is a computer and is used for man-machine interaction, and discrete 'temperature-sensitivity' values of the high-temperature acceleration sensor obtained through standard inspection are input through the upper computer and are transmitted to the single board computer. The signal interface chassis transmits the temperature signal and the acceleration signal to the single board computer. The single board computer obtains the compensated acceleration signal through the operation of a sensitivity dynamic compensation method, and then transmits the compensated acceleration signal to a peripheral instrument (a vibration control or data acquisition and analysis system) through a signal interface cabinet.
In some embodiments, the sensitivity dynamic compensation device mainly comprises an industrial computer ABOX5600, a single-board computer NI SbRIO-9637 and a signal interface cabinet. The single board computer integrates a real-time controller, a data acquisition card and a data output card. The industrial personal computer is provided with sensitivity dynamic compensation software and is used for user operation and establishment of a high-temperature acceleration sensor temperature-sensitivity database. The signal interface chassis transmits a temperature signal and an acceleration signal to the single board computer; carrying out sensitivity search according to the temperature signal; calculating a compensation coefficient, and compensating the acceleration signal; and outputting the compensated acceleration signal to peripheral equipment (a vibration controller or a data acquisition and analysis system). The embedded real-time controller adopts FPGA hardware, an FPGA clock can reach 40MHz, the running frequency of dynamic compensation software can reach 20kHz, and the real-time property of data can be met.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A sensitivity dynamic compensation method of a high-temperature acceleration sensor is characterized by comprising the following steps:
s1, establishing a temperature-sensitivity database of the high-temperature acceleration sensor;
s2, acquiring an acceleration signal and a temperature signal;
s3, searching the sensitivity of the acceleration sensor at the corresponding temperature in a database;
s4, comparing the searched sensitivity value with the sensitivity value set by the peripheral instrument to obtain a compensation coefficient;
s5, compensating the acceleration sensor signal;
and S6, outputting the compensated acceleration sensor signal.
2. The method for dynamically compensating the sensitivity of the high-temperature acceleration sensor according to claim 1, wherein in step S1, a hermitian interpolation method is used to perform interpolation fitting on discrete "temperature-sensitivity" values to obtain a relatively continuous "temperature-sensitivity" curve, and a "temperature-sensitivity" database of the high-temperature acceleration sensor is established.
3. The method for dynamically compensating the sensitivity of the high-temperature acceleration sensor according to the claim 1, wherein in step S4, the compensation coefficient is r,
a (mV/g) is a sensitivity value set by a peripheral instrument, and b (mV/g) is a sensitivity value searched in a database; in step S5, the compensated acceleration sensor signal is rx (mv), and x (mv) is the collected acceleration signal.
4. The device for dynamically compensating the sensitivity of the high-temperature acceleration sensor according to claim 1, comprising an upper computer, a single board computer and a signal interface box, wherein the temperature signal and the acceleration signal are input into the signal interface box, the upper computer is connected with the single board computer, and the single board computer is connected with the signal interface box.
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| CN104914275A (en) * | 2014-03-10 | 2015-09-16 | 北京大学 | Novel MEMS capacitive accelerometer temperature compensating circuit |
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| CN111157244A (en) * | 2020-01-07 | 2020-05-15 | 华东交通大学 | Bearing fault detection method for high-speed train gearbox transmission system |
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- 2022-03-18 CN CN202210270373.5A patent/CN114689900A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103558415A (en) * | 2013-11-19 | 2014-02-05 | 中国兵器工业集团第二一四研究所苏州研发中心 | MEMS accelerometer with temperature compensation function |
| CN104914275A (en) * | 2014-03-10 | 2015-09-16 | 北京大学 | Novel MEMS capacitive accelerometer temperature compensating circuit |
| CN104502632A (en) * | 2014-11-28 | 2015-04-08 | 郑州合智汇金电子科技有限公司 | Temperature compensation method for quartz acceleration sensor |
| CN108534942A (en) * | 2018-03-28 | 2018-09-14 | 西南交通大学 | A kind of minute-pressure resistive sensor vibration and temperature interference compensation model and system |
| CN108982915A (en) * | 2018-05-25 | 2018-12-11 | 广西电网有限责任公司电力科学研究院 | A kind of acceleration transducer temperature-compensation method |
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