JPS59183373A - Rotary apparatus - Google Patents

Abstract

PURPOSE:To enable the automatic monitor of a rotation irregularity frequency spectrum, by converting a vibration spectrum obtained by developing a rotary angle speed signal to Fourier series to a correlated rotation irregularity spectrum. CONSTITUTION:The revolving and rotating angle of a rotary table 2 on which an object 1 to be tested is mounted is detected by an angle detector 8 and compared with a reference value by an angle encoder 9 to be converted to a rotary angle signal which is, in turn, stored in a memory apparatus 15 through an A/D converter 17, an input output interface 13 and CPU14. In this case, the stored signal is read by CPU14 to perform development to Fourier series to determine a vibration frequency spectrum. In addition, conversion operation to a rotation irregularity frequency spectrum correlated to the vibration frequency spectrum is performed and a converted result is displayed by an output display apparatus 16. By this mechanism, the rotation irregularity frequency spectrum in performing a rotation test by using a flight body such as an artificial satellite as an object to be tested can be automatically monitored.

Description

[Detailed Description of the Invention] This Invention & Completion A rotating device that mounts rotating flying objects such as artificial satellites as test objects and rotates these test objects.
The present invention provides a rotating device having a function of automatically monitoring the frequency spectrum of the rotational unevenness by analyzing the frequency of the rotational unevenness in the rotational unevenness.

First, a conventional rotating device of this type will be briefly explained using figures.

Fig. 1 shows the configuration of a conventional device of this kind. In Fig. 9, (1) is the specimen, (2) is the rotary table on which the specimen is mounted and rotates, (31&j structure, and (4) is a bearing (5) provided between the rotating table (2) and the structure (3);
(6) is a rotating shaft that is connected to the rotary table and transmits rotational force thereto, and (6) is a motor that applies rotational force to the rotating shaft (5).

(7) is a drive unit that drives the motor (6); (8)
+91 is an angle detector (e.g., tachometer, resolver, etc.) that is attached to the rotation shaft (5) and detects its rotation angle, and +91 is an angle encoder that processes the angle signal sent out by the angle detector (8). , Qlf Ding above drive unit (7
) and angle encoder (9) via cable (111).

This is a control section that controls the drive section (7) based on the signal obtained from the angle encoder (9).

Since the conventional rotating device is configured in this way, the specimen (1) is attached to the rotating table (2), and the rotating table (2)
can be rotated without friction by the bearing (4).

This rotation is rotation! til [I C5+ is the motor (6)
In order to stabilize one rotation, the control signal sent to the drive section (7) is generated by processing the angle signal detected by the angle detection section (8) with the encoder (9).

This control signal is input to the control unit aα and created as a control signal such that the rotational angular velocity becomes constant with this control HISQQI. Even with such control, it is inevitable that temporal fluctuations in rotational angular velocity, that is, rotational unevenness, occur.

On the other hand, it is extremely important to keep the 1st rotation speed constant and to suppress the 9th rotation unevenness as low as possible when conducting attitude control system spin tests for artificial satellites. This has a negative effect on the operation of the electronic equipment on board the satellite, making correct testing impossible.

On the other hand, factors that cause unevenness in one rotation include imperfections in the specimen (1) and air resistance.

There is also vibration of the bearing (4). It is almost impossible to completely eliminate these factors and eliminate uneven rotation.

Therefore, it was necessary to measure the rotational unevenness and use all of the rotational unevenness measurement values to identify the effects related to the rotational unevenness occurring in the specimen (1).

The present invention has been made for the purpose of providing a rotating device having the function of measuring the rotational unevenness mentioned above.

Next, one embodiment of the apparatus according to the present invention will be described in detail using full drawings.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention;
FIG. 3 is a flowchart showing the flow of processing, and FIG. 4 is a conceptual diagram of rotational unevenness measurement.

In the figure, (1) to 01) are the same as in FIG. however.

(9) is an angle encoder that compares the above angle signal with a reference value and sends out these errors as a rotational angular velocity signal.
, flZ is an input device (for example, a keyboard) that inputs information to the central processing unit α41 (referred to as CPU).

G31&X CPU (141 and each input/output device it
(17) is a storage device for storing measurement data and processing programs in the input/output ink face +ll51 that relays with the tug opening Z +161 and (+71), Qei & Go output display device (e.g. CRT), (17) is the above-mentioned corner encoder (9 ) is converted into an analog signal, and this digital signal is used as input/output ink face 03).
Via C, PU (A/D converter that sends to 141).

Next, the operation of the apparatus according to the present invention will be explained. The operations of the agreeing elements from +11 to 01) are the same as in the conventional example shown in FIG. 1, and will therefore be omitted.

At A in Fig. 3, input the drive conditions of the rotating device, that is, rotation angular velocity 0 rotation unevenness open side frequency range and total 611j time using the i! J″1121. This manual data is input to the input/output interface 031 and the CPU f1.
41i and is stored in the storage device 051.

Next, at B, the specimen (1) is mounted on the rotary table (2).

Next, at C in FIG. 3, a command to start full rotation of the turntable (21) is inputted from the input device #o21.

This command is sent to CPU0 via input/output interface U31.
41, and a processing program is started.

Next, at D in FIG. 3, the drive unit command sent from the CPU Q41 rotates the motor (6) that started the drive unit <71 when the control unit a (llvc is input) and the turntable (2) is activated.
) at a predetermined rotational angular velocity.

Next, at E in Fig. 3, the angle signal sent from the angle detector (8) is converted into a rotational angular velocity signal H by the full-angle encoder]9) and input to the A/D converter a'rI. This A/D converter (171) converts the rotational angular velocity signal R from an analog value to a digital value, and this digital value is sent to the CPU (171) via the input/output interface OQ.
41 and stored in the storage device (15).

In this way, the value of the rotational angular velocity signal R is stored in the storage device 05) as temporally continuous time-series data.

Next, at E in FIG. 3, it is determined whether or not the rotational unevenness measurement has been performed for a predetermined period of time. If the measurement is finished, at G in FIG. 3, calculations are performed to analyze the frequency of the rotational angular velocity signal R.

The calculations performed here are based on the time-series data of the rotational angular velocity signal R stored in the storage device (151K) and the CPU (141K).
9 and performs Fourier expansion according to the processing program. As a result, a nine-cell rotation spectrum S (Fig. 4) is obtained.

On the other hand9, for example, if we select a mechanical despan antenna (hereinafter referred to as MDA) for an artificial satellite as the specimen (1), the MD
A is rotated in the opposite direction to the rotation direction of the 0 satellite so as to maintain earth pointing as the satellite rotates in orbit.

The above-mentioned rotational unevenness spectrum has an important meaning in Yanghe, who rotates the specimen (1) having MDA with such a functional metal and performs a test to maintain its earth orientation.

The uneven rotation of the 9-rotation platform (2) interferes with the control operation of the MDA, which disturbs the earth orientation of the MDA and causes wobbling.As shown in Figure 4, this wobbling has characteristics related to the 1-rotation unevenness frequency. However, there is a point P at which the maximum fluctuation occurs at a certain rotational unevenness frequency.

In this way, the wandering of the MDA is a function of the rotational unevenness frequency, so it is necessary to obtain the rotational unevenness spectrum S and reduce the rotational unevenness spectrum near S1, which has a large interference with the MDA wandering. be.

By the way, the rotational unevenness spectrum near 81 is that of the specimen (1
) depends largely on the imbalance between

Therefore, the main part of the rotational unevenness spectrum near S1 can be reduced by completely removing the irregularities in the specimen (14 circuits with 1).

Now, the 0th order is 1 (and the above-mentioned rotating insect spectrum is displayed on the S total output display device (16) in FIG. 6.

Since it works like this, the effect is.

You can know the rotational unevenness spectrum, and the specimen +11
There is an advantage in that it can provide an effective means for taking measures to prevent interference with the operation of the specimen (1) during the rotation of the specimen (1).

Furthermore, since the rotational unevenness spectrum can be obtained automatically and at high speed, there is an advantage that it is possible to measure the rotational unevenness frequency spectrum, which has conventionally been impossible.

Next, another embodiment of the present invention will be described using FIG. 9.

FIG. 5 is a block diagram showing the configuration of another embodiment of the invention, and FIG. 6 is a flow chart showing the flow of processing.

FIG. 7 is a conceptual diagram of rotational unevenness measurement.

In the figure, (1) to (171) are the same as in Figure 2. U is attached to one point of the base (21) of the structure (3), detects pressure and converts it into an electric signal, and this pressure detection signal a pressure detector for transmitting ttst';c; an amplifier for amplifying the pressure detection signal of the pressure detector θ~; This is a filter with low-frequency offshore wave characteristics.

Next, the operation of another embodiment of the invention will be explained.

However, only operations that differ from the embodiment will be explained here. In the process shown in Fig. 6, the pressure detector Q detects the vibration of the structure (3) mainly caused by the unbalance of the specimen tl+ as a pressure change, and inputs it as a vibration detection signal to the amplifier 4.Amplifier il!IG The vibration detection signal obtained during construction is amplified to a level suitable for measurement and output to the filter (20).The filter removes the noise contained in the amplified vibration detection signal and converts it into iA/D converter 0'. 71.

The A/D converter (171 converts the vibration detection signal from an analog value to a digital value and sends it to the CPU Q41 via the input/output interface 113. CPU Q
41 is a vibration spectrum U (Fig. 7) obtained by Fourier expansion of the vibration detection signal according to the processing program. generate.

The correlation coefficient X between the rough one-turn unevenness spectrum S (FIG. 7) and the vibration spectrum U is calculated.

The closer X is to 1, the deeper the relationship between S and U, that is, the more S occurs due to U.

On the other hand, the vibration spectrum Jj is caused by imperfections in the specimen (1), the structure of the bearing, the air resistance that the specimen (1) receives during rotation, etc., and the degree of vibration caused by these factors (or It can be obtained analytically in advance.

Therefore, by determining the correlation coefficient x-6 between S and U as described above, it is possible to understand what is causing the uneven rotation.

By understanding the causes of uneven rotation, we can take appropriate measures such as correcting imperfections in the specimen (1), or adjusting the shape of the specimen () and ground boundaries to reduce changes in air resistance. This has the advantage of being able to take measures to reduce rotational irregularities.

Although each component is shown separately in the embodiment, it is also possible to combine several components into one component to provide the unique functions of each component. Various modifications may be made without departing from the gist of the invention.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of a conventional rotary mount, FIG. 2 is a block diagram of the configuration of an embodiment of the device according to the present invention, and FIG. 3 is a diagram showing the processing flow of an embodiment of the device according to the present invention. ~
Flowchart, FIG. 4 is a conceptual diagram of rotational unevenness measurement, FIG. 5 is a block diagram of the configuration of another embodiment of the device according to the present invention, and FIG. 6 is a flowchart of processing of another embodiment of the device according to the present invention. flow diagram. FIG. 1 is a conceptual diagram of rotational unevenness measurement. In the figure, (1) is the specimen, (2) is the turntable, (3) is the structure,
(4) is the bearing, (5) is the rotating shaft, (6) is the motor,
(7 Tanma Kaku IIIJ section. (8 Tancho angle detector, (9) is angle encoder, aQ
kZ %lI Hook part, a1) is a cable, (1z is an input device, 03 is an input/output interface, u4) is a central processing unit, and u51 is a storage device. IJG1kl output display device, a'nl is A/D converter, αυ (ヱpressure detector, uaBj width meter,
(support)) is a filter, and Ql) is a foundation part. Note that the same or corresponding parts in FIG. 9 are designated by the same reference numerals. Agent Masuo Oiwa Fig. 1 Fig. 2 Fig. 3 Fig. 4 υ Number of rotations Fig. 5/6- Fig. 6 1 Fig. 7

Claims (2)

[Claims] (1) A rotating table on which all structures are mounted and performs rotational motion. (b) A box-shaped pile that supports one unit, a bearing provided between the rotating table and the structure, connects the mechanism, the rotating circle connected to the rotating table, and the rotating shaft to the rotating shaft. a motor that provides rotational force; a drive unit that drives the motor; an angle detector that is attached to the rotating shaft and detects the rotational angle; and a control signal that controls the rotational speed of the rotating table based on the rotational angle. A control unit that sends the rotation angle signal to the drive unit, and a rotating device that includes a means for converting the rotation angle signal obtained from the angle detector into a rotation angular velocity No. 1b, and a predetermined data processing based on the rotation angular velocity signal. All information is exchanged between the storage device g that stores the program necessary for the execution and the rotational angular velocity signal, and the storage device, and a control signal is given to the control unit that controls the drive unit, and the rotational angular velocity is controlled by the storage device g. A central processing unit that performs predetermined calculations based on the above, an input means that inputs the driving conditions of the turntable, a measurement time of the rotational angular velocity, etc. to the central processing unit, and an output means that outputs the measurement results, When the structure is rotated, the rotational angular velocity signal is changed over time, that is, the rotational angular velocity signal is converted into a rotational unevenness spectrum by Fourier series expansion, and the rotational angular velocity signal is converted into a rotational unevenness spectrum and outputted to the output means. rotating device. (2) Attached to a point on the foundation of the above structure. A pressure detector that converts the pressure applied to this point into an electrical signal, an amplifier that converts the pressure detection signal output from the pressure sensor into an electrical signal, a filter that converts the output signal of the amplifier into a P wave, and the output signal A means for inputting the sound digital signal into the central processing unit, a vibration spectrum obtained by performing the full Fourier series expansion of the pressure detection signal, and a correlation coefficient between this and the rotation unevenness spectrum obtained by the output means. to output to′? r: scratches, marks (percentage) Claim t] The rotating device according to claim 1.