CN87203748U - Equipment for determining the level of unbalance - Google Patents
Equipment for determining the level of unbalance Download PDFInfo
- Publication number
- CN87203748U CN87203748U CN 87203748 CN87203748U CN87203748U CN 87203748 U CN87203748 U CN 87203748U CN 87203748 CN87203748 CN 87203748 CN 87203748 U CN87203748 U CN 87203748U CN 87203748 U CN87203748 U CN 87203748U
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- CN
- China
- Prior art keywords
- value
- cosine
- converter
- microcomputer
- summation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model relates to the equipment for determining the level of the unbalance. The utility model is that the output of a vibration sensor is connected with a computer by a modulo / number converter. The test signal is sampled and converted in the light of the tempo of the modulo / number converter. The arithmetic mean of the M time sampling yielded by a summation circuit is multiplied to the positive / cosine value of a register. N products are read out orderly by a central processing unit, and are sent to a memory, and then are respectively calculated the summation of the sine and the cosine on the basis of the rotation period. The average value is fetched, and then scaled to get the component in the X-Y coordinate plane of the asymmetry of a measured rotor.
Description
The utility model relates to the disequilibrium survey of balancer and disequilibrium survey instrument.Particularly a kind ofly use mould/number conversion numeral summation circuit and microcomputer carries out the device that degree of unbalancedness is measured.
Existing degree of unbalancedness measurement is by the vibration transducer output test signal superimposed with disturbing vibration.This test signal in the rotor swing circle, converts N＜being at least 3〉digital instantaneous value by certain beat to by A/D converter through low-pass filter.These instantaneous values carry out program control multiplying each other respectively with sine and cosine value frequently with computing machine or counter in test process.Each time multiplied result by just/cosine adds up respectively, and obtains each swing circle mean value.This product mean value is promptly represented the degree of unbalancedness component on the rotor rectifying plane, and the back shows or record by polar form through converting.Such as DE-OS2459-282, the G01M1/22 patent is exactly this.One of deficiency of this proving installation is: what A/D converter was gathered is the instantaneous value of measuring-signal.And this instantaneous value need by means of the multiplication calculation procedure realize successively with just/cosine value multiplies each other.So operation time is long, influences measuring accuracy.Two of deficiency is that frequency is the N-1 of rotational frequency, N+1,2N-1 owing to this program control multiplying each other in asking product of numbers mean value process ... undesired signal doubly will cause the maximum error of product mean value.Therefore the low-pass filter that is complementary with balancing speed need be set before mould/number conversion.The rotating speed that adapts to different class must be provided with the FL-network of several different cutoff frequencys, perhaps will change element and parameter accordingly.Make device structure and complicated operation.
The purpose of this utility model provides a kind of cutoff frequency and is fixing single low-pass filter and employing A/D converter, and digital summation circuit and microcomputer are realized the digital averaging value of measuring-signal and the degree of unbalancedness determinator that the sine and cosine value multiplies each other.
Realize that the purpose of this utility model is that the output of vibration transducer is delivered to A/D converter and microcomputer interface by low-pass filtering.The cutoff frequency of low-pass filter is a fixed value relevant with the highest sample frequency of A/D converter.Be chosen as 1/3 or 1/5 of the highest sample frequency in the reality.The gain of wave filter will be selected to such an extent that the variation range of test signal voltage and the input range of A/D converter are complementary.Be provided with in the microcomputer obtain measuring-signal mean value and realize with just/summation circuit that cosine function multiplies each other.This summation circuit is by three totalizer A
1, A
2, A
3With three shift register R
1, R
2, R
3Form, and link to each other with microcomputer bus.
Rotor whenever circles during test, and photoelectric sensor scans the azimuth mark of rotor, and sends a phase reference pulse to CPU (central processing unit).CPU (central processing unit) the cycle of this basic pulse be divided into N for example 256) time interval of equating, each is divided into M beat at interval again.In each time interval, A/D converter beat according to the rules carries out M sampling and conversion to the test signal of wave filter output.By totalizer A
1To M digital conversion value summation, obtain totalizer A
1High K figure place, promptly get the arithmetic mean of the test signal in should the time interval.This arithmetic mean is sent into shift register R
1With shift register R
2, R
3Just/the cosine function value multiplies each other.Again by totalizer A
2, A
3The partial product that this is multiplied each other is sued for peace, and draws the mean value of each time interval build-in test signal and the product of just corresponding/cosine value at last.This product is read by CPU (central processing unit), being sent to memory aligns respectively/the cosine summation by rotation period, L the testing mean (promptly whenever try to achieve a new rotation period test value, then replace a oldest test value) of getting slip obtains the component on the X-Y coordinate plane of measured rotor degree of unbalancedness through conversion.
The utility model is owing to adopted the cutoff frequency single wave filter relevant with the highest sample frequency, thereby technical easy realization, and simple in structure.Simultaneously since the arithmetic mean of measuring-signal with just/cosine value carries out hardware multiplication, is to carry out simultaneously in the adjacent time interval and ask arithmetic mean with multiplication mutually, so no time lost, and fast operation can adapt to very high rotating speed.Because L the testing mean that adopt to slide as test result, thereby can be eliminated effectively and be lower than rotational frequency or disturb non-periodic at random and vibrate, need not increase the test duration, the measuring accuracy height herein.
Below in conjunction with accompanying drawing structural principle of the present utility model is elaborated.
Be illustrated as theory diagram of the present utility model.
Microcomputer among the figure partly is by summation circuit (5), CPU (central processing unit) (12), programmable timer (13), and memory (14) and input-output unit (15) are formed.Link to each other with bus (16) between them.Summation circuit (5) is by totalizer A
1(6), A
2(7), A
3(8) and shift register R
1(9), R
2(10), R
3(11) form.Be installed in the output terminal of the electromechanical vibration sensor (2) on the rotor to be measured (1),, receive the input end of summation circuit (5) by low-pass filter (3) and A/D converter (4).Totalizer A
1(6) shift register R is received in output
1(9).Shift register R
2(10), R
3(11) totalizer A is received in output respectively
2(7), A
3(8) input end.Shift register R
2(10), R
3(11) lining have from memory (14), insert participate in multiplying just/the cosine function value.Have in the memory (14) in advance N of input just/the cosine function value and deposit nearest L for example 3,6,12 or 24) the uneven test value of rotation period.
When driving rotor (1) rotation, photoelectric sensor (17) carries out oncontacting scanning to the azimuth mark (18) that is coated with on the rotor, and revolution produces a phase reference pulse, outputs in the CPU (central processing unit) (12).CPU (central processing unit) (12) with the interval of two pulses as measuring period, with its be divided into N for example 256) time interval of equating and give timer (13) programming, in each time interval, export M sampling/summation pulse and K displacement/summation pulse equably.
When each time interval begins, totalizer A
1(6), A
2(7), A
3(8) at first be cleared, then A
1(6) the new accumulative total at interval of beginning, and A
2(7), A
3(8) then begin to last interval test signal arithmetic mean with just/partial product that cosine function multiplies each other sues for peace.The concrete course of work is; Totalizer A
1(6) arithmetic mean in is sent to shift register R
1(9) in, CPU (central processing unit) (12) is given register R
2(10), R
3(11) insert corresponding sin cos functions value.Three shift registers all time clock synchronously under be shifted.R
1(9) serial output is used for controlling totalizer A
2(7), A
2(8) action.Each time clock, register R
1(9) move to left one, register R
2(10), R
2(11) just respectively move to right one.R
2(10) and R
3(11) output promptly represent this just/cosine function 2
-iDoubly.When the i time shift-out bit is 1, make totalizer A
2(7) A
3(8) respectively with register R
2(10) and R
3(11) addition when the i time shift-out bit is zero, makes totalizer A
2(7), A
3(8) all remain unchanged.After K position arithmetic mean all shifts out, totalizer A
1(7), A
2(8) in and the product arithmetic mean of representing last time interval test signal respectively and just corresponding/cosine value.
When each time interval finishes, read totalizer A by CPU (central processing unit) (12)
2(7) A
3(8) the measuring-signal arithmetic mean in just/the cosine function value is long-pending, and be sent to memory (14) and add up respectively.
When each rotation period finished, CPU (central processing unit) (12) was averaged the aggregate-value of N product, as the test value of this rotation period.Whenever try to achieve a new rotation period test value, promptly replace a test value the earliest in L the rotation period.Get the mean value of L test and be converted on the rectifying plane of rotor (1), show and print as current test result, and can be stored on the flexible plastic disc.
When adopting two rectifying planes to test, need two relatively independent passages.In the channel B (9) just/cosine function register and control signal can with can with passage A(20) public.
Claims (3)
1, a kind of involving vibrations sensor, low-pass filter, the degree of unbalancedness determinator of A/D converter and microcomputer is characterized in that:
(a) the highest sample frequency of the cutoff frequency of low-pass filter and A/D converter is complementary,
(b) be provided with in the microcomputer obtain measuring-signal numeral arithmetic mean and realize with just/summation circuit that the cosine function value multiplies each other.
2, device according to claim 1 is characterized in that summation circuit is made up of three totalizers (6), (7), (8) and three shift registers (9), (10), (11).
3, device according to claim 1 is characterized in that depositing in the memory of microcomputer the uneven test value of a nearest L rotation period.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87203748 CN87203748U (en) | 1987-03-15 | 1987-03-15 | Equipment for determining the level of unbalance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87203748 CN87203748U (en) | 1987-03-15 | 1987-03-15 | Equipment for determining the level of unbalance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87203748U true CN87203748U (en) | 1988-01-13 |
Family
ID=4819703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87203748 Ceased CN87203748U (en) | 1987-03-15 | 1987-03-15 | Equipment for determining the level of unbalance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87203748U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033315A (en) * | 2012-12-26 | 2013-04-10 | 北京控制工程研究所 | Simple and efficient tank parallel- balance emission test system and method |
-
1987
- 1987-03-15 CN CN 87203748 patent/CN87203748U/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033315A (en) * | 2012-12-26 | 2013-04-10 | 北京控制工程研究所 | Simple and efficient tank parallel- balance emission test system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |