DE2444101A1 - PROCEDURE AND ARRANGEMENT FOR VIBRATION CONTROL - Google Patents

Description

PATE NTAN WÄ'-TE DIPL-ING. JOACHIM K. ZENZ DIPL-ING. FRIEDRICH G. HELBER

ESSEN-BREDENEY ALFREDSTRASSE 383 TELEPHONE: (0 2141) 47 26 TELEGRAM ADDRESS: ELROPATENTE ESSEN

File number: New registration Connmerzbank. Essen account 1516202

Postal checking account Essen No. 76

Name d. Note: Tirae / Data Corporation

My reference: T 45 ^Date September 12th 1974

Time / Data Corporation, 1050 E, Meadow Circle, Palo Alto, California 94303, VoSt.A.

Method and arrangement for vibration control

In US-PS 3 710 082 a vibration control system is described in which the vibrational oscillations, to which a test object is exposed in a vibration device, scanned and converted into a digital signal are »The digital signal is converted into a frequency domain representation using the Fourier transform In addition, a spectrum of the frequency domain representation, ZoB. the power spectral density (PSD) calculated. The actual PSD to which the test object is exposed is then compared with a target or reference PSD compared, and the results of this comparison are for example with the help of a multiplier circuit combined with a statistical signal. The results of this combination are then for example converted into the time domain function using an inverse Fourier transform and in analog form as Control signal used for the vibration device.

Z / be

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In some applications it is desirable to have only one
The frame scanned by the test object or test item
To use information to 'generate a steep signal whose duration is greater than that of the
sampled signal is. This is especially true
to be aimed at when slower and less laborious
Calculating machines are to be used to carry out the Fourier transforms and the comparison.
To this end, the results are used according to the invention
a frequency / time domain mapping of a statistical arrangement before they are converted into analog form, whereby a single frame of the sampled information to generate a plurality of frames for the
Control signal can be used without a continuous flow of information needing to be transmitted over the entire system.

In the arrangement for vibration control according to the invention, there is a measuring device for sampling the vibration oscillations _{9 to} which a test object is exposed on a vibration device, and an analog / digital converter for converting the sampled signal into digital form
Use. The digital form of the sampled signal
is converted in a known manner, for example using the Fourier transformation, into a frequency domain representation from which a spectral representation of the signal, for example a spectral power density (PSD), is derived. The actual PSD to which the test object is subjected is then compared with a specified spectrum or
a reference spectrum, and the comparison results are then combined with a statistical or pseudo-statistical signal to generate an actuating signal. Thereafter, the control signal is preferably converted into the time domain using an inverse or inverse transformation, e.g. the Fourier inverse transform, and this time domain representation is arranged randomly or statistically in a randomization means according to the invention in order to generate a continuous control signal . According to a preferred

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Embodiment of the invention, the random machine has a circular memory, which is a multiple digital words existing frame of the control signal can continuously circulate. A statistical number generator belonging to the random machine causes reading out the circulating control signal in such a way that a statistically selected word of the signal as First word of a frame is used «A variety of frames of information are derived from this Ural accumulators derived and in analog form for production of a continuous control signal for the vibration device implemented »The content of the circulating memory s is based on the new information frame taken from the previously explained comparison of the actual PSD with the reference PSD periodically updated. The invention enables multiple use of a Single frame of the scanned information, so that with the conversions from the time domain in the frequency domain and conversely related arithmetic operations can be carried out more slowly than the creation of the Frame the control signal to the vibration device. The random machine develops a multi-frame statistical signal as a control signal for the vibration device even if only a frame of the calculated information is available

To minimize discontinuities between the In a further development of the invention, signal frame processing takes place in such a way that a single frame of the control signal is multiplied by a known function and then superimposed with other frames where the frames are delayed in time to form a continuous control signal. “This section processing (windowing) can be used in conjunction with the random machine.

In the following, exemplary embodiments of the invention are explained with reference to the drawing. In the drawing show:

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1 shows a block diagram of the overall arrangement for vibration control;

FIG. 2 shows a block diagram of the random machine according to FIG. 1;

Fig. 3 shows an embodiment of the statistical number generator shown in Fig. 2;

Fig. 4 is a block diagram of the frame processing device;

5 shows a series of waveforms for explaining the operation of the section processing device} and

6 shows a block diagram of an alternative exemplary embodiment of the statistical number generator

In the following an arrangement and a method for controlling a vibration test device, e.g. Vibrating tables, described. Hit the help of the one described A test object in or on the vibration device can vibrate with a specified system Spectrum, e.g. a specified power spectral density (PSD) or car spectral density. The description of the arrangement is based on a vibrating device, for example a vibrating table; it is however, it is clear that both the arrangement and the method used to control a vibrating device can be used, for example, for high-intensity sound testing and other acoustic testing procedures. The terms "vibrator" or "Shake systems" refer to any of a number of Vibration testing equipment, as known in Way used to test specimens acceleration forces or subjecting them to vibrations. In The term "statistical signal" is also used in the following description. Under this term should also - unless expressly excluded - pseudo-statistical Signals that are generated digitally,

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fall »

With the exception of the randomization unit 28 and the windowing means 29, the arrangement shown in FIG. 1 is similar to the system described in UoS ₀ -PS 3 710 082. The arrangement according to FIG. 1 comprises a vibration device 10 , which serves a specimen or _o a ^p rüfobjekt 11 vibration vibrations to unterwerfenο a scanning device 12 which is coupled to the DUT 11, the vibration oscillations samples, where the specimen is exposed. 11 Known accelerometers or other scanning devices can normally be used for this purpose. The scanned vibratory oscillations are transmitted to an analog / digital converter 14, in which they are converted into digital form. The results of the conversion into digital form are then fed to a PSD processing device 16 in which the digital signal coming from the converter 14 is converted into a frequency domain representation, for example using Fourier transformation, and the spectral power density PSD to which the test object is exposed is calculated.

Numerous known computers can be used to obtain the PSD or another frequency range representation. Such a computer is _{specified in U 0} S ₀ -PS 3 638 »This computer can also be used to carry out the Fourier inverse transformation (converter 26)» Other algorithms that can be used to perform the time domain to frequency domain conversion and to convert from the frequency domain to the time domain are described in "An Algorithm for Machine Computation of Complex Fourier Series," Math of Computation, Volume 19, pages through 301, April 1965, by Cooley and Tukey, and in the Franklin Institute Journal, Volume 233, April 1942, by Danielson and Tanczos. In the U ₀ S ₀ -PS 3 004 an analog / digital converter is also specified,

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which can be used as an analog / digital converter 14.

In the case of arrangements of the type shown in FIG. 1, a limited sample of information or -Sampling, hereinafter referred to as frame, processed in the various arithmetic units »So For example, in the case of the analog / digital converter 14, the vibration oscillations that the test object 11 passes over is suspended for a predetermined period of time, and the converter 14 converts the sampled information into a Most of the digital values forming the frame around »At In the embodiment described, a frame of approximately 500 digital words is used, with each digital word comprises several bits, e.g., 16.

The actual PSD is compared in a PSD comparator 18 with a reference or target PSD, the latter being stored in a reference PSD transmitter 20. The encoder 20 may be adapted to store digital information as a normal memory, while the PSD comparator may be a suitably programmed to perform the comparisons digital computer "Various comparison operations are ₀ S ₀ -PS 3,710,082 describes in column 4 and column 17 of the U . As PSD Comparator 18 and multiplier 22 (Fig _o 1), commercially available computer, eg the model PDP-11 from Digital Equipment Corporation or "Super Nova" Data General Corporation, or the Model 620 / S from Varian Corporation be used.

A statistical phase angle generator 24 can be any Device designed for generating a statistical number or a pseudo-statistical number be, in the described embodiment the statistical or pseudo-statistical number in digital Form is being developed »Various methods and circuits can be used to generate a piseudo-statistic Signal can be used. A suitable circuit that

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is used in the random statistical machine or in the manifold 28 is shown in Fig _O 3. Methods for generating a statistical and pseudo-statistical signal are given in "Random-Process Simulation in Measurements" by Granino Ao Korn (McGraw-Hill Company publication)

The angle generated by the statistical phase angle generator 24 is combined with the comparison results generated in the PSD comparator 18, specifically in the described embodiment by multiplication in the multiplier circuit 22. The multiplier circuit 22 can be a separate digital unit or can be provided as part of the PSD comparator 18 be. In the exemplary embodiment described, a statistical phase angle with only four possible values is used. These values are arbitrarily chosen to be +/- 45% and +/- 135%, and the digital signals representing this angle are sequentially applied to the multiplier circuit 22. For simplicity of explanation, the control signals, and in particular those for applying these signals to the multiplier circuit 22 and timing signals used to control the remainder of the arrangement are not shown. For a precise analysis of the mathematical processes involved in generating the pseudo-statistical signal using four phase angles and their application to an arrangement of a comparable type, reference is made to "A Digital Control Vibration or Acoustic Testing System" by Charles L ₀ Heizman, in Proceedings of the Institute of Environmental Sciences, Meeting on. Environmental Testing, Anaheim, California, April 20-23, 1969, pages 287-409.

The multiplication results of the multiplier circuit 22 are converted by a frequency / time domain converter 26 converted into a time domain function using the inverse Fourier transform. The output signal of the

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Converter 26, which consists of a control signal for the vibration device 10 representing information frame, is via a line 54 to the random machine or to the statistical distributor 28 or to a section processing device 29 headed. In known arrangements, the output from converter 26 was sent directly to the Digital / analog converter 30 transmitted and used in analog form as a control signal for the vibration device 10

The random machine 28 forms a device for the statistical arrangement of the output signal of the converter 26 in such a way that a single information frame is used by the converter 26 to generate a large number of control signal frames, which are transmitted via the line 55 to the digital / analog converter 30, there in analog form implemented and then used as a control signal for the vibration device »As will be explained below, the section processing _{device 29 serves to smooth the transition between the frames a} The multiplier circuit 22 and the converter 26 are operated with slower cycle times and consequently contain less complex components, although regulation of the vibration device 10 with a continuous statistical signal is ensured Particularly useful where the test item 11 shows a stable or unchangeable behavior under test conditions and where the transfer function of the test item and that of the vibration device remain essentially constant or change only slowly over time, _etc.

In order to explain the functioning of the random machine or the statistical distributor, the following the mathematical principles of the results obtained with unit 28 are briefly explained «Let me begin with

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Assume that X "(to) the Fourier transform is a single frame of the regulating or control signal, which is obtained in the time domain by the converter 26 _o If a plurality of frames of the single frame to be formed, is obtained for the 1-th frame in the following order:

(1)

where IT is the delay associated with the 1st frame and Jt is the amount by which the 1st frame is rotated o Wenn the information in the frame is subjected to a uniform circular shift from frame to frame, see above is 7J = 3eC / T, where eCT is the shifting step of each Framework is. It can be shown that the resulting spectrum S (ω) with

ff

E iff

reads as follows:

The quantity representing the ratio of the two sine functions in equation (2) causes a modulation or spike formation with periodic peaks at frequency intervals of 2Tt ^ / (SsC + I) T of the spectrum _o If the information in the frame is therefore rotated or shifted by a constant value the frame sequences give a jagged spectrum, which as such is undesirable because a continuous smooth function is required _o On the other hand, if T \ is statistical and independent of 1, the resulting spectrum is defined by the following equation:

X _T (w) | ² (3)

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From this equation it can be seen that a plurality of frames may be formed on the basis of the information contained in a single frame by repeated statistical shift in the contained in a single frame information, whereby the desired output signal is developable _o This function is provided by the in FIG _o 3 shown! Random machine developed «

Referring to FIG, "3 has the random machine or the statistical distribution a circulating memory 32 which via the line 54 a data input frame accommodates _o The circular memory may be continuously circulated through the line 52 contained in the frame information word for word, where i a line 50 to the circulation clock are supplied Taktimpulsje determining, as a circulating memory, ^various. Memory designs, including dynamic memory used werdeno The output signal of the memory 32 is also applied to one input terminal of an AND gate 36. "The other input terminal of the AND gate 36 is connected to the output of a comparison 40 and an input terminal of an AND gate 34 _o The other input connection of the AND gate 34 is on the clock signal line 50. The output of the AND gate 34 is connected to an NI counter 44. The NI counter 44 is an ordinary digital counter that can count up to N ~ 1 = N is the Number of words in the information frame received from the circular memory 32 via the input line 54. The content of the NI counter 44 is queried by a decoder 46. As soon as this decoder determines the number NI in the NI counter 44, it develops a reset signal on the line 48 at the next clock pulse, which resets a counter 38 and acts on a statistical number generator 42 in this way that this transmits a number to the comparator 40. The comparator 40 compares the content of the counter 38 with the number applied by the statistical number generator 42 and, if the two numbers match, it develops an output

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signal to the AND gates 34 and 36 is transmitted «. The output signal of the AND logic element 36 is fed to a digital buffer circuit 35, the output signal of which is on the output line pending. Any device for generating a statistical or a pseudo-statistical number such as the circuit shown in Fig. 3 can be used. The one from the generator The numbers generated are preferably between 0 and N.

The circuit elements according to FIG. 2, such as the AND gates 34 and 36, the counters 38 and 44, the decoder 46, the comparator 40 and the buffer circuit 35 can usual. Be digital circuits.

If, during operation, a single information input frame is supplied to the circular memory 32 via the line 54, the information frame is continuously circulated under control of the clock pulses supplied on the line 50. The AND gate 36 is continuously controlled with the content of the memory, which, however, is not transferred to the buffer circuit 35 until a signal is received from the comparator 40 the statistical number generator 42 is applied. This triggers the counting operation of the counter 38, and the statistical number generator applies a statistical number to the comparator 40. If the number matches in the counter with the present at the comparator number, a mask signal from the comparator 40 to the AND gate 36 is applied, the information in the circulating memory through the AND gate 36 hides in the buffer circuit 35 _o Under these conditions, also the AND gate 34 is set and the NI counter 44 begins to count. When the NI counter 44 has counted to NI, the counter 38 is reset to zero with the next clock pulse and another statistical number is applied to the comparator 40 via the generator 42. The operation repeats itself, if so

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the number in the counter 38 again matches the number developed by the statistical number generator 42, the words forming the information frame stored in the memory 32 become via the AND circuit 36 transferred to the buffer circuit 35 "It is clear that with each new number developed by the generator 42 another word forming the frame is transmitted to the buffer circuit 35 as the first word. In this way will each information frame based on the dem Circulating memory communicated original frame statistically distributed, whereby a control signal with the desired Spectrum on output line 55 is developed.

The circulating memory is periodically supplied with new information via line 54. Therefore, the processing device 16, the comparator 18, the multiplier circuit 22 and the converter 26 according to FIG. 1 with operate at a slower speed than in known systems, although the vibration device 10 is a Control signal with the desired spectral content is made available »

In the circuit according to FIG. 2, the timing signals on line 50 at a higher repetition rate than the timing signals used in the remainder of the arrangement operated in order to ensure a relatively continuous flow of data to the buffer circuit 35.

According to FIG. 3, the pseudo-statistical number generator which can be used as generator 42 in FIG. 2 has a 25-bit shift register 58 on. The information in the shift register is fed via line 66 at the frequency Clock pulse sequence shifted; this clock frequency differs in the described embodiment from that of the pulse train on line 50 from "The content of the 25th stage of the register is fed to the input terminal of a Inverter 60 and applied to an input terminal of an OR gate 63 «. The content of the third

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Shift register stage is applied to one terminal of an OR gate 64 and to the input terminal of an inverter 61 _o The other terminal of the OR gate 63 is connected to the output of the Inve: turned-rters 61 The other input terminal of the OR gate 64 is connected to the output of the "connected inverter 60, the outputs of the OR gates 63 and 64 are led to the input terminals of an OR Verknüpfungs- member 62, and the output of the OR gate 62 is connected via a line 68 to the input, d <> h _e with connected to the first stage of the shift register. Due to the arrangement of the circuit shown in FIG. 3, the shift register 58 contains a pseudo-statistical number when the information in the shift register is shifted and fed back to the first stage of the register via line 68. Other known circuits can be used to generate the statistical number in The positive and negative values of a single number can be used if the determination of the sign is subjected to chance. A single number and zero can be used if the choice between the two is made at random.

In Fig. 6 is an alternative embodiment of the statistical Number generator shown, which has an analog noise generator 90 in this exemplary embodiment. This generator is a known device for generating noise. That Noise generated by the generator 90 is applied to an analog-to-digital converter 91, in which it according to the requirements of clock pulses supplied periodically via line 92 or in accordance with the reset signal on the Line 48 (Fig. 2) is scanned »The digital output signal of the converter 92 is in a downstream Output register 93 stored. The output signal of the register 93 is sent to the comparator via a line 94 40 of the arrangement according to FIG. 2 and is used there

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as a comparison component for the comparison with the number generated by the counter 38 _o

The section processing device labeled 29 in Fig. 1 takes over a single frame of the setting information and uses it to form a sequence of frames for driving the vibrating table 10 _o The section processing device receives input information via line 54 from converter 26 and sends an output signal to converter 30. The section processing device 29 can also process input information from the random machine 28, the output signal of the random machine not being passed directly to the converter 30, but rather via the line 55 to the section processing device 29. The output signal of the section processing device 29 is then converted into analog form by the converter 30 used"

In FIG. 5, to which reference is first made in the following, a schematic signal representation for explaining the mode of operation of the section processing device 29 is shown. The horizontal lines 84, 85, 86, 87 and 88 represent time axes, with the line 89 representing the time t = 0. It should be noted that the diagram of FIG. 5 shows information in analog form, while the section processing device 29 is actually processing digital information. The control signal is shown on the line 88, which was formed either from a single frame or from the signal from the converter 26 (FIG. 1) or from a series of frames picked up by the random machine 28. The information on the line or axis 88 serves _o

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after conversion into analog form (converter 30) as a control signal for the vibrating table 10. It is initially assumed that the input signal of the cut-out processing device 29 consists of an information frame derived from the output of the converter 26. This single frame is shown repeatedly on lines 84, 85, 86 and 87. The amplitude of the information frame was determined with a known function, e.g. a sine function multiplied to define the envelopes 82 of the frames. The frames are as shown in Figure 5 adds _o such that the information on the lines 84, 85, 86 according to the additive superposition forms, 87, the information represented on the axis 88th For example, the frame shown on line 85 is added with the information on line 84 starting approximately at the midpoint of the frame on line 84. Similarly, the frame shown on line 86 is added to the frame on line 85 starting approximately at the midpoint of the frame shown on line 85. In the event that a sequence of frames is applied to the section processing device 29 by the random machine 28, the summation and multiplication with a known function for forming the envelope curves 82 take place in the same way. In this case, however, the information shown on lines 84, 85, 86, 87 has previously been subjected to a statistical arrangement by the unit 28

The section processing device is shown schematically in FIG. 4. It has two circulating accumulators 71 and 72 on. The memory 71 circulates the information over the line 74 during the information circulation takes place in memory 72 via line 73. The output of the circulating memory 71 becomes an amplitude control means 77 supplied while the output signal of the circulating memory 72 to an amplitude control device 76 is applied. The amplitude of the signals in the amplitude control devices 76 and 77 are controlled by means of a function generator 80. The output signals

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of the amplitude control devices 76 and 77 are applied to a summing circuit 79 in which they are summed. Timing signals are applied to the various components of the circuit shown in FIG. For the circuit elements of Figures 4 _o ordinary electric circuits may be used.

The function generator 80 generates (in digital form) a function corresponding to the envelope curves 82 in FIG. 5. In the exemplary embodiment described, it is a sine function. It will be appreciated that the function generator 80 must generate a signal having first and second phases of a function. In the case of the sine function, a signal is phase-shifted by 90 with respect to the second signal _o One of these signals is applied to the amplitude control device 77 and the other to the amplitude control device 76 o The amplitude control devices 76 and 77 can be multiplier circuits that combine the signal from the function generator with the signal from the circulating memory multiply"

The section processing described can also be carried out in that only the beginning and the end of a repeated frame are sharpened, only the sharpened portions of the repeated frame being made to overlap in order to develop a continuous signal. In the embodiment described, the sums of the squares of the overlapping sections are equal to Io. the beginning of another frame or repeated frame is summed, as are the sums of the square, d _o h "sin Q + cos © = 1" This ensures that the voltage applied to the shaking cleaning "power" periods en to the cream has no peaks or valleys, _etc.

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It is assumed for the purpose of explanation that the clip processing means 29 according to FIG. 4 is used in the arrangement according to FIG. 1 without the random machine 28. In this case there is a single information frame applied by the converter 26 to the two circulating stores 71 and 72. At time t = 0 the information recorded by the circulating memory 71 is applied to the amplitude control device 77, the predetermined function, e.g., a sine function, simultaneously from function generator 80 to the amplitude controller 77 is created. The output of the amplitude control device 77 is fed to the summing circuit 79. Their output signal corresponds in digital Shape of the waveform shown on line 84 in FIG. After about half of the frame stored in memory 71 has been read out of the memory, the frame stored in the circular memory 72 is also read out to the amplitude control device 76. The function generator 80 in turn supplies a predefined function which is used to define the envelope curve 82 in FIG. 5 will. The output signal of the amplitude control device 76, which corresponds, for example, to that on the line 85, is in the summing circuit 79 with the output- signal of the amplitude control device 77 summed while the information from the circulating memories 71 and is read out, it is fed back via the lines 74 and 73 and can then be read out again will. The output of summing circuit 79 is the signal shown on line 88 in FIG. which, after being converted into analog form, serves as a control signal for the vibrating table 10.

In the preferred embodiment, the information from the random machine or the statistical distribution unit 28 to the section processing device 29 and not applied directly to the digital / analog converter 30. When the clipping processing device is used in conjunction with

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of the random machine 28 is used, the frames supplied by the random machine 28 are alternately applied to the memories 71 and 72. In this mode of operation, the memories 71 and 72 are not operated as circular memories but as ordinary memories, and the information once read out is not circulated. Alternately the memories 71 and 72 input frame is read in the embodiment shown in FIG _o 5 way with mutual phase shift from the memories, wherein the amplitudes of these signals are in turn combined with a known function from the function generator 80 to the envelope 82 shown in FIG. 5 to be defined.

In the following, reference is again made to FIG In operation, the converter 14 converts the signal sampled by the sampling device into a digital signal which is applied to processor 16. In the preferred embodiment, a single frame the information supplied by the converter 14 is used to calculate the PSD to which the test object is exposed »This PSD is compared with the reference PSD in comparator 18, and the comparison results are stored in the multiplier circuit 22 compared with a statistical phase angle generated by generator 24 «The multiplication results are then converted to a time domain function in converter 26, and this function is passed to the random machine 28 and in this before being applied to the section processing device 29 statistically arranged. A multiplicity of frames of the control or actuating signal is used by the random machine 28 for development a continuous control signal for the Vibration device 10 released »Periodically, the converter 26 puts a continuously updated version Information frame that replaces the information previously stored in the random machine 28 and the Development of a further sequence of control frames made possible by the random machine 28.

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The described arrangement for vibration control thus enables multiple use of a single one Control information frame for the development of a continuous control signal that contains the desired spectral content and contains a high degree of randomness.

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Claims (14)

PATENT LAWYERS ZENZ & HELBER. ESSEN 1, ALFRcDSTRASSE 383. TEL .: (02141) 472687 Pages -20- 2444101 claims 1. Arrangement for vibration control with a movement of a specimen scanning measuring device and a Datenrahraen as a function of a comparison between the measured spectrum and a predetermined spectrum generating computing device, characterized in that the computing means (16 _β .26), a random machine (28) is connected downstream, which is designed so that it statistically arranges the data frame in a plurality of control frames serving as control signals. 2. Arrangement according to claim 1, characterized in that the generated by the computing device (16 ... 26) The data frame consists of digital data and that the random machine (28) has a digital / analog converter (30) downstream, which generates an analog control signal from the digital control frame » 3. Arrangement according to claim 1 or 2, characterized in that the random machine (28) is designed in such a way is that it takes the information from the arithmetic unit (16β «.26) The data frame delivered is processed repeatedly to generate the actuating signal. 4. Arrangement according to one of claims 1 to 3, characterized in that at least one scanned Information frame First converter (16) which converts into the frequency range and is connected to the measuring device (12) Is that the first converter compares the converted information frame with the specified spectrum The comparison unit (18) is followed by a combination device (22) with the comparison unit and a statistical generator (24) connected and 50981 9/0963 24AA101 is designed in such a way that it generates a combined signal from the statistical signal and the data frame developed that a second converter (26) is connected to the output of the combination device (22) which is the output of the combiner in time domain form as a control signal for generation of the control signal is applied to the random machine (28). 5. Arrangement according to claim 4, characterized in that the converter (16, 26) for performing the Fourier transformation are suitably designed. 6. Arrangement according to claim 4, characterized in that the combining device is a multiplier circuit (22) is. 7. Arrangement according to one of claims 1 to 6, characterized in that the random machine (28) is designed in such a way is that it consists of a control signal supplied to it of limited duration by successive statistical Arrangement generates a continuous control signal for controlling a vibration device (10). 8. Arrangement according to one of claims 1 to 7 for generation a continuous actuating signal from a predetermined section of one consisting of several digital words Control signal, characterized in that the random machine (28) has a predetermined section storing memory (32), a statistical generator "(42) and one with the memory and the statistical Generator connected control circuit (34, 35, 36, 38, 40, 44, 46), wherein the control circuit is formed is that the digital control signal under statistical arrangement with each different selection a word can be read out from the memory (32) as the first word to form the continuous actuating signal. 509819/0963 24441O1 9. Arrangement according to claim 8, characterized in that the content of the memory (32) periodically through a new control signal consisting of several digital words can be changed. 10 «, arrangement according to one of claims 1 to 7, in the a control signal of greater duration for a vibration device from a supplied control signal of a predetermined duration can be generated, characterized in that the random machine (28) has a circulating memory (32, 52) for the control signal of a predetermined duration and the control signal with a statistical arrangement from the circulating memory having reading out statistical generator (42). 11. Arrangement for vibration control with a plurality of digital signal frames, in particular according to one of claims 1 to 10, wherein a computing device is provided that a first digital data frame as a puncture of a comparison generated between a measured spectrum and a predetermined spectrum, characterized by a section processing device (29), a function generator (80), at least one of the beginning and the end section multiplying the first digital data frame with a predetermined function generated by the function generator Circuit (76, 77) and a summing circuit (79), wherein the summing circuit is formed so that in each case at least one end portion of a frame (84) with the Beginning portion of a subsequent frame (85) can be summed. 12. A method for regulating the movement of a vibration device with a statistical signal for generation of a predetermined power spectral density, with a first representing the movement of the vibration device spectral power density compared with the specified spectral power density and a comparison result A characteristic digital signal is generated, wherein a statistical signal is also generated and wherein the comparison signal and the statistical 509819/0963 24AA1O1 Signal in a statistical control signal specified Duration is converted into time domain form, characterized in that the control signal of a predetermined duration is processed by statistical arrangement to a continuous, statistical control signal with which the Movement of the vibration device is regulated. 13. The method according to claim 12, characterized in that the comparison is made in each case with a digital signal given duration is carried out and that the digital comparison signal before the conversion into the time domain form is combined with the statistical signal. 14. The method according to claim 13, characterized in that the digital signal of a predetermined duration periodically ent winds and different control signals are arranged statistically in the Zeitbe rich form. 509819/0963 Blank page