Method for monitoring at least one power machine driven by a rotating machine

Abstract

The invention relates to a method for monitoring at least one work machine (1) driven by a rotary machine (2), wherein the following steps are performed: 10 - detecting (110) at least one detection information (200) at the work machine (1), the detection information being specific to an acceleration at the work machine (1), - transmitting (120) the detection information (200) to a central processing device (10) via a network (5), 15 - implementing a processing (130) of the transmitted detection information (200) in order to determine rotational speed information for monitoring, the rotational speed information being specific to a rotational speed of the rotary machine (2).

Description

Technical Field

[0001] This invention relates to a method for monitoring at least one working machine driven by rotating machinery. The invention further relates to a system and computer program for such monitoring. Background Technology

[0002] In the case of working machinery such as pumps, monitoring the state of the working machinery, and especially the state of the rotating machine or motor that drives the working machinery, is crucial to ensuring functionality. Here, it is known from the prior art that diagnostic equipment can be used in the working machinery to detect measured parameters at the working machinery, and by evaluating the detected measured values, the state can be inferred, specifically the rotational speed of the working machinery.

[0003] However, assessments using conventional methods are often inaccurate or technically very costly, as they require, for example, a large number of measured values. Furthermore, conventional methods for determining rotational speed have the disadvantage that they are either based on direct evaluation of electrical measurement parameters of the rotating machine or cannot be reliably used in the case of speed-regulated working machinery. Summary of the Invention

[0004] Therefore, the objective of this invention is to at least partially eliminate the aforementioned disadvantages. In particular, the objective of this invention is to provide an improved solution for monitoring working machinery.

[0005] The aforementioned task is accomplished by a method having features according to the first aspect of the invention, a system having features according to the second aspect of the invention, and a computer program having features according to the third aspect of the invention. Other features and details of the invention are derived from this disclosure. Herein, the features and details described in conjunction with the method according to the invention also apply in conjunction with the system according to the invention and the computer program according to the invention, and vice versa, so that disclosures relating to various aspects of the invention are always mutually referenced or may be mutually referenced.

[0006] This task is addressed in particular by a method for monitoring at least one working machine, wherein the working machine is preferably driven by a rotating, especially an electric motor. The working machine may be constructed, for example, as a pump or specifically as a centrifugal pump, wherein the rotating machine drives the pump shaft.

[0007] In the method according to the invention, it may be specified that at least one of the following steps is preferably performed sequentially in the described order or in any order, wherein each and / or all of the steps may also be performed repeatedly:

[0008] - Detect at least one piece of detection information at the working machine, wherein the detection information in the working machine may be specifically for acceleration, especially for mechanical oscillation and / or velocity changes and / or deflection (and / or specifically for the rotational speed of a rotating machine), wherein the detection is preferably performed by a monitoring device at the working machine.

[0009] - The detection information is transmitted to the central processing unit via a network, wherein the transmission device of the monitoring device sends the detection information to the network, and the central processing unit receives the detection information from the transmission device.

[0010] - Preferably, the detection information, especially the transmitted detection information, is processed by a processing device to determine the rotational speed information for monitoring, the rotational speed information being specifically for the rotational speed of rotating machines and / or working machinery.

[0011] By processing the detection information transmitted in advance to the central processing unit, the following advantages can be achieved: the processing for determining the rotational speed information can be performed centrally outside the location of the working machine. The monitoring device for detecting the detection information can therefore be implemented with relatively low technical complexity and low energy consumption. Furthermore, the method according to the invention can achieve monitoring in a particularly reliable manner based on the processing, which is specifically implemented as oscillation analysis of the detection information.

[0012] When necessary, monitoring devices, such as diagnostic equipment, can be used directly at the working machinery to detect and transmit the detection information. Here, diagnostic equipment can be primarily used for detection, allowing processing to be performed at least primarily by a central processing unit, and even partial oscillation analysis of the detection information by a monitoring device may not be necessary if needed. Therefore, it is possible to perform processing centrally by a processing unit to keep the technical complexity of the monitoring device low. Furthermore, it is possible that the detection information differs from the electrical measurements and / or regulation parameters of the rotating machinery, especially the motor, allowing monitoring, and especially the determination of rotational speed information, to be performed without using the electrical measurement parameters or regulation parameters of the rotating machinery. Therefore, access to the rotating machinery or its regulation can be eliminated to perform the method according to the invention.

[0013] The working machinery can be constructed, for example, as a pump device, such as a centrifugal pump device. The working machinery can also be driven by an electric motor and / or rotating machine, such as an asynchronous motor. For this purpose, the asynchronous motor can be constructed as an unregulated (i.e., operating, for example, at the power grid) or a speed-regulated asynchronous motor. In the case of a speed-regulated asynchronous motor, it can be stipulated that regulation information (e.g., electrical measurements and / or setting and / or regulation parameters of the rotating machine) is inaccessible to monitoring devices or for monitoring purposes. In principle, within the scope of this invention, it can be stipulated that direct determination of the rotational speed at the rotating machine is prevented. For example, this can prevent spatial access to the rotating machine or evaluation of the electrical measurement parameters of the rotating machine. Therefore, it is necessary to determine the rotational speed indirectly, for example, by evaluating the resulting mechanical oscillations at the working machinery. To enable this evaluation, oscillations can be detected, for example, by at least one oscillation sensor.

[0014] The monitoring device may have at least one oscillation sensor for detecting (mechanical) oscillations. The at least one oscillation sensor may be implemented to detect accelerations at the working machinery in at least one, at least two, at least three, or exactly three directions (especially orthogonal and / or the same to each other). It is possible that the resulting detection information can be represented by relatively small data (i.e., with a reduced data size), making it possible to transmit data via a network, such as the Internet, and thus to perform centralized processing. To obtain data with a reduced data size, the detection information can be obtained, for example, from measurements by at least one oscillation sensor having a short measurement duration. This also reduces the energy consumption of the monitoring device and eliminates the need for technically costly processing directly through the monitoring device. Therefore, the method according to the invention or the monitoring system according to the invention also enables the particularly reliable and accurate digital detection and / or evaluation of pump parameters, such as rotational speed.

[0015] It is possible that the monitoring device for detecting (mechanical) oscillations has at least one, at least two, at least three, or exactly three acceleration sensors to detect acceleration in the same (measuring) direction at the working machinery. Thus, redundant detection of oscillations by the monitoring device is possible, for example. In principle, any number of different or identical measurement directions can be set at any number of spatial measurement points (spatial locations of the acceleration sensors). Here, it is preferable to perform measurements simultaneously using acceleration sensors. Alternatively or additionally, the monitoring device for detecting (mechanical) oscillations may have at least one, at least two, at least three, or exactly three acceleration sensors to detect acceleration in different and, especially orthogonal, directions at the working machinery. The corresponding oscillation sensor may also have at least one of the acceleration sensors.

[0016] The detection information can be implemented as oscillation information, for example, as digital measurements derived from measurements of mechanical oscillations and / or acceleration at the working device. This means that the detection information can include at least one piece of information regarding the oscillations of the working machinery and / or rotating machine. Specifically, the detection information can be a short-term record of oscillation data, for example, recorded in at least one, two, or three dimensions. Accordingly, at least one oscillation sensor can be used to detect the detection information, measuring the oscillations at the working machinery and / or rotating machine. Generally, the detection information can be implemented as a signal with repetitive patterns, the frequencies of which can be evaluated by means of frequency analysis. For this purpose, Fourier analysis can be used, for example, as frequency analysis, to determine in this way: how strongly, i.e., with what kind of oscillations, are present in the detection information. The detection information is thus decomposed into a fundamental frequency and other frequencies. The other frequencies can correspond to integer multiples of the fundamental frequency and therefore to harmonics of the fundamental. The fundamental frequency can be a relevant parameter for monitoring, for example, from which the rotational speed can be determined.

[0017] Frequency analysis (especially in the form of Fourier transforms) of short-term records of oscillation data from rotating machines can reveal the increased harmonic manifestations of the machine's rotational frequency. Therefore, according to the invention, a sophisticated processing of this information can be used to obtain robust speed estimates that, despite the short-term data, still provide improved results in terms of accuracy and stability. This additionally has the advantage that short measurements are sufficient to detect the information and that the information can be transmitted with small size and / or quantity of data. In this way, subsequent processing can also be performed outside the monitoring device, for example, centrally in a processing device, i.e., in the cloud. Furthermore, the described actions enable speed estimation to also be performed on working machinery, such as speed-regulating pumps. Moreover, due to the lower cost of detecting the information, energy consumption at the oscillation sensor can be reduced, and therefore the monitoring device can be operated on battery power for longer periods.

[0018] This invention can be based on the consideration that if the determination of the fundamental frequency of the detection information is performed in a more robust and reliable manner, taking into account harmonics, then the determination of the fundamental frequency of the detection information is possible. Thus, the determination of the rotational speed information is not only based on the identification of a single frequency, but is also supported by the determination of other frequencies. This further leads to the avoidance of undesirable processing instability. If only one frequency is identified in the spectrum based on the peak with the best signal-to-noise ratio, unstable frequency determination may occur according to conventional solutions, for example. However, according to the invention, multiple frequencies of harmonics can be used for frequency determination. For this purpose, using normalized peaks (i.e., peaks) for calculation and spectrum can be particularly advantageous, as will still be described in detail below.

[0019] In the method according to the invention, it is possible to determine rotational speed information as a result of processing, specifically providing information about the rotational speed (or rotational frequency) of the working machinery, and especially rotating machines. The rotational speed information may, for example, include, a fundamental frequency or rotational frequency in Hertz or rotational speed in revolutions per unit time (especially minutes). This information can be further processed to, for example, determine the state of the working machinery. The rotational speed information, for example, indicates a fault in the working machinery. The rotational speed information can also be used, if necessary, to perform operating point estimation for the working machinery. If a fault has been detected, actions may optionally be initiated based on the determined rotational speed information, such as a corresponding error notification to the user or automatic shutdown of the working machinery.

[0020] Furthermore, it is conceivable that, particularly for oscillations in one, two, or three mutually orthogonal (and / or identical) directions, detection would be performed by at least one or exactly one oscillation sensor at the working machinery, in order to determine the detection information preferably in the form of one-dimensional, two-dimensional, or three-dimensional acceleration values. For example, the oscillation sensor for this purpose may have one to three (or more) acceleration sensors aligned such that the acceleration sensors measure acceleration in (one, two, or) three different (or identical) directions. Thus, oscillations can be reliably detected at the working machinery.

[0021] It may be advantageous if, within the scope of this invention, the network is at least partially implemented as a mobile radio network and / or the Internet and / or a WLAN (Wireless Local Area Network) and / or a Bluetooth network and / or something similar, and if necessary, a combination thereof, wherein the detection information is preferably detected at a large number of working machines in different locations and transmitted to a processing device for centralized processing. Thus, the central processing device can, in principle, be in data connection with a large number of working machines to receive the detection information separately. Here, processing can also be performed in a cloud-based manner, thereby providing the possibility of technically efficient centralization for processing.

[0022] Furthermore, within the scope of this invention, the process can be specified as oscillation analysis, particularly to determine rotational speed information based on the fundamental frequency and other harmonics of the detected information, preferably performing rotational speed estimation. Specifically, in this case, the frequency of the fundamental frequency can indicate the rotational speed. Harmonics can additionally be used to improve the determination of the fundamental frequency and / or the estimation of the rotational speed.

[0023] Furthermore, it is conceivable that the fundamental frequency is determined (i.e., identified) during processing by evaluating harmonics, especially in order to estimate the rotational speed from it (i.e., from the determined fundamental frequency). Harmonics have frequencies that exist in a fixed proportion to the fundamental frequency. Therefore, it is possible to infer the fundamental frequency by evaluating harmonics.

[0024] Another advantage within the scope of this invention can be achieved if the following steps are performed during the processing used to determine the rotational speed information:

[0025] - Perform frequency analysis of the detection information to determine its spectrum.

[0026] - Perform identification of multiple frequencies in the spectrum, wherein preferably the frequencies are assigned to the fundamental frequency and / or at least a pre-given number of harmonics of the detection information.

[0027] - Perform calculations based on the identified frequencies, where the calculations can be parameterized by a pre-given number of harmonics.

[0028] If the detection information has values ​​for different dimensions, such as for different mutually orthogonal directions x, y, and z where oscillations exist, then frequency analysis can be performed separately for each of these dimensions. Accordingly, a spectrum can be obtained for each frequency analysis, which can optionally be combined with each other, for example, by summing them into a single spectrum. In this way, additional noise reduction is also possible. This can be calculated by comparing the identified harmonics and the identified fundamental frequency with each other to obtain a statement about the rotational speed and / or the frequency identifying the fundamental frequency (fundamental frequency).

[0029] Alternatively, it is conceivable that performing frequency identification includes the following steps:

[0030] - Identify peaks in the spectrum in order to identify frequencies at those peaks, wherein the identified peaks are specifically assigned to harmonics and / or frequencies corresponding to the fundamental frequency.

[0031] - Identify the peaks in the normalized spectrum so that subsequent calculations can be performed based on the normalized peaks.

[0032] In this context, standardization can be understood as setting the identified peaks to the same value (same amplitude), so that while the amplitude of each peak affects identification, it does not affect subsequent calculations. For example, a peak is identified only if it meets specific requirements, such as forming a maximum value and / or being located above the noise component of the detected information. Then, during identification, frequencies, such as harmonics and / or fundamental frequencies, can be assumed at the location of the identified peaks. For this purpose, peaks can also be identified, for example, using thresholds.

[0033] In another possibility, it can be specified that the (subsequent) calculations include the formation and spectrum, where the identified frequencies are summed in a weighted manner, particularly the normalized peak values. This represents a reliable possibility for determining (i.e., identifying) rotational speed information, and especially the fundamental frequency, while taking harmonics into account. Furthermore, this can also be used as a noise suppression measure to improve the reliability of frequency determination.

[0034] Furthermore, within the scope of this invention, it is conceivable to determine the rotational speed information based on the sum spectrum, wherein preferably the rotational frequency is estimated at the maximum value of the sum spectrum. The maximum value can be determined, for example, by an iterative method and / or by means of the Taylor approximation in the case of the sum spectrum.

[0035] Furthermore, it is conceivable that the detection information is set in terms of acceleration values ​​in at least one, two, or three dimensions, preferably measured at the working machinery. Here, when processing by dimension, the spectrum can be determined separately from the acceleration values, and if necessary, the amplitudes of the spectra in different dimensions can be summed to transform the spectrum into a single (one-dimensional) aggregated spectrum. This summation of the amplitudes in all three coordinates can also be used as a noise suppression measure.

[0036] It is further advantageous to specify that interpolation, particularly trigonometric interpolation, is performed on the (total) spectrum in order to perform frequency identification or said identification in the interpolated spectrum. In this case, interpolation can also be performed, for example, by zero padding. This makes it possible to reliably determine the rotational speed information from a small number of values ​​already detected.

[0037] In another possibility, it can be stipulated that, during processing, to determine the rotational speed information, the fundamental frequency and integer multiples of the fundamental frequency of the detected information are identified and / or considered in a weighted and / or normalized manner, and therefore in a manner with the same amplitude, preferably in a manner weighted according to predefined weights, so as to identify the fundamental frequency and use the identified fundamental frequency as the rotational speed information. It is possible that, when identifying frequencies, although the fundamental frequency and integer multiples of the fundamental frequency, i.e., harmonic frequencies, are identified first and, for example, identified as peak values, the associated frequencies, especially the fundamental frequency, cannot still be identified. This means that, in the case of the identified frequencies, it is still impossible to distinguish whether the frequency is the fundamental frequency or a harmonic, etc. To identify the frequency, calculations or such calculations can therefore be performed to make a specific statement about which of the identified frequencies is the fundamental frequency or related to the rotational speed information.

[0038] A system for monitoring at least one working machine driven by rotation, particularly an electric motor, is also the subject of this invention, said system comprising:

[0039] - A monitoring device for detecting at least one detection information (especially directly) at a working machine, wherein the at least one detection information is dedicated to acceleration at the working machine, i.e., for example, dedicated to at least one mechanical oscillation in at least one direction.

[0040] - A transmission device, particularly a monitoring device, for transmitting at least one detection message to a central processing unit via a network, wherein the processing unit is implemented, for example, as a data processing device, such as a central server.

[0041] - The processing device is used to perform (digital) processing on the transmitted detection information in order to determine the rotational speed information for monitoring, which can be dedicated to the rotational speed of the rotating machine.

[0042] Therefore, the system according to the invention provides the same advantages as described in detail with reference to the method according to the invention. Furthermore, the system can be adapted to perform the method according to the invention.

[0043] Computer programs, particularly computer program products, for monitoring at least one working machine driven by rotation, especially an electric motor are also the subject of this invention. These computer programs, particularly computer program products, include instructions that, when executed by a processing device, cause the processing device to perform the following steps, preferably sequentially or in any order, wherein these steps may correspond to method steps according to the method of the invention:

[0044] - Receive at least one detection information from the network, wherein the detection information is specifically for acceleration detected at the working machine and may have been previously detected by a monitoring device at the working machine.

[0045] - The received detection information is processed to determine the rotational speed information for monitoring, which can be specifically used for the rotational speed of the rotating machine.

[0046] Therefore, the computer program according to the invention provides the same advantages as described in detail with reference to the method and system according to the invention. Furthermore, the computer program can be adapted to at least partially implement the method steps according to the invention. Specifically, the computer program can be implemented for those method steps executed by a processing device to implement the method according to the invention. For other method steps, additional computer programs can be provided if necessary, which are executed by a monitoring device. Attached Figure Description

[0047] Other advantages, features, and details of the invention will become apparent from the following description, in which embodiments of the invention are described in detail with reference to the accompanying drawings. Here, the features mentioned in the application documents may be important to the invention individually or in any combination. Wherein:

[0048] Figure 1 A schematic diagram of the system according to the present invention is shown.

[0049] Figure 2 A schematic diagram is shown for visualizing the method according to the invention.

[0050] Figure 3 A schematic diagram showing the identified peaks in the spectrum is shown.

[0051] Figure 4 A schematic diagram showing the normalization of the identified peaks in the spectrum is shown.

[0052] Figure 5 A schematic diagram of the summation spectrum is shown. Detailed Implementation

[0053] In the following figures, the same reference numerals are used for the same technical features, even from different embodiments.

[0054] exist Figure 1The diagram illustrates a system for monitoring at least one working machine 1 driven by a rotating machine. The rotating machine is exemplarily constructed as a motor 2, such as an electric motor. The working machine 1 is also shown, designed, for example, in the form of a turbine. To enable the transport of a medium, rotational motion is generated by the motor 2, which in turn induces oscillations at the working machine 1. Accordingly, the purpose of monitoring is to infer the state of the working machine 1 based on the oscillations. For this purpose, a monitoring device 50 can be configured to detect at least one detection information 200 at the working machine 1. For this purpose, the monitoring device 50 can have a sensor system to measure at least one acceleration at the working machine 1. Therefore, the detection information 200 is dedicated to at least one acceleration at the working machine 1. Here, it may be meaningful to use at least one oscillation sensor 20 for the sensor system, which can detect acceleration in one or more directions. This makes it possible to detect one-dimensional, two-dimensional, or three-dimensional detection information 200, which then has information about acceleration in the one or more different directions. Traditionally, to reliably monitor the working machine 1, a large amount of information needs to be detected, which cannot be evaluated in a cloud-based manner due to its data size. However, according to the present invention, the detection information 200 can have such a small data size that it is possible to transmit 120 via network 5 to the central processing unit 10. For this purpose, a transmission device 51 can be provided at the working machine 1. The central processing unit 10 is configured, for example, as a data processing device for performing processing 130 on the transmitted detection information 200 to determine rotational speed information for monitoring, the rotational speed information being dedicated to the rotational speed of the motor 2. For this purpose, the central processing unit 10 can have a memory 12 in which a computer program 100 is stored in a non-volatile manner and can be read and implemented by the processor 13. Furthermore, the receiving device 11 of the central processing unit 10 can be configured to receive at least one piece of detection information 200 from the network 5.

[0055] exist Figure 2 The method steps according to the invention for monitoring working machinery 1 are shown in more detail below. According to a first method step, at least one detection information 200 is detected 110 at the working machinery 1. Subsequently, according to a second method step 120, the detection information 200 is transmitted 120 via network 5 to a central processing unit 10. According to a third method step 130, the transmitted detection information 200 can then be processed 130 to determine rotational speed information for monitoring, said rotational speed information being specifically for the rotational speed of motor 2. In this case, processing 130 can be implemented as oscillation analysis to determine the rotational speed information based on the fundamental and other harmonics of the detection information 200, and in particular, to perform rotational speed estimation. During processing 130, the following steps can also be performed to determine the rotational speed information:

[0056] -Perform frequency analysis 131 on the detection information 200 to determine the spectrum 210 of the detection information 200.

[0057] - Perform identification 132 of multiple frequencies in spectrum 210, wherein the frequencies are assigned to the fundamental frequency and at least a pre-given number of harmonics of detection information 200.

[0058] - Perform calculations 133 based on the identified frequencies, where the calculations are parameterized by a pre-given number of harmonics.

[0059] like Figure 3 As exemplarily illustrated, performing identification 132 may include identifying peaks 211 in the spectrum 210 to identify frequencies at peaks 211. The spectrum 210 in... Figures 3 to 5 The amplitude A is represented at frequency f. It can be seen that... Figure 3 In this context, the amplitude A has different heights depending on the peak value 211 of the continuous line, and therefore has not yet been standardized. Figure 4 To further perform identification 132, the identified peaks 211 in the spectrum 210 can be normalized so that subsequent calculations 133 can be performed based on the normalized peaks 211. Peaks 211 are thus set to have the same amplitude. Subsequent calculations 133 can include... Figure 5 The sum spectrum shown is formed by adding the identified or located frequencies, particularly the normalized peak 211, in a weighted manner. Frequency determination can then be performed based on the sum spectrum to determine rotational speed information, where the rotational frequency is estimated for this purpose at the maximum value of the sum spectrum.

[0060] The following should describe the processing of 130 using other details. For example, as detection information 200, the following information is given in the form of N measured samples with acceleration values ​​in three coordinates:

[0061] .

[0062] N can represent the number of measurements, and for example, at a sampling rate of 4 kHz, it can be 2. 10 Now, frequency analysis 131 can be performed for each of the three coordinates x, y, and z, as a one-dimensional, but also two-dimensional or three-dimensional Fourier transform, if necessary. The following example demonstrates that a discrete Fourier transform should be performed for x as frequency analysis 131 to obtain the corresponding spectrum 210:

[0063] .

[0064] This has a continuous continuity:

[0065] ,

[0066] The continuation also allows computation within a pre-defined discrete window (Bin) via the Discrete Fourier Transform. The frequency components between.

[0067] Then, through The triangular interpolation yields the interpolated result A, where That is, it is obtained by summing the amplitudes of all three coordinates x, y, and z. The trigonometric interpolation A can be calculated as follows:

[0068] .

[0069] One possibility for implementing interpolation could be so-called "zero-padding" at position 200 of the detection information. The exemplary change process of A(b) is as follows: Figure 3 The graph is shown as a continuous line. Subsequently, a high-pass filter can optionally be applied to A(b), for example, by... Given, where l(b) represents the filter kernel. In this way, the noise component A*l can be reduced, and the peaks in the environment can be increased.

[0070] The relative peak height can then be standardized to identify 132. This ensures that harmonics are included in the speed estimate with equal weight. This can be calculated as follows:

[0071]

[0072] in .

[0073] Instead of the E described, another function that induces peak normalization can be used. P(b) is exemplarily shown in Figure 4 As shown in the image.

[0074] The weighted sum spectrum can be determined for subsequent calculations 133:

[0075] .

[0076] In this case, n harms The number of harmonics to be considered is denoted by , and w represents the appropriate weighting, which can be determined empirically, and can also be 1, for example. The number n harms It can be, for example, in the range of 10 to 40, preferably 15 to 35. The spectrum is reproduced exemplarily. Figure 5 middle.

[0077] The rotational speed or rotational frequency can then be estimated by frequency determination, where the rotational frequency can be determined as the maximum value in the spectrum.

[0078] .

[0079] In this case, f sample The sampling rate of the sensor can be represented, for example, 4 kHz, and f min and f max This represents a predefined limit of the possible speed range, such as f. max =100 / s and f min =8 / s.

[0080] For the purpose of being particularly useful as a computer program, it is preferable to use a formula. To exemplify the determination of rotational speed, the function S can first be appropriately diffused at equal intervals.

[0081] .

[0082] The number M of discretization steps over the entire defined range of S should be chosen to be proportional to N. The estimate is defined as...

[0083] .

[0084] This estimate can be used to determine the exact value. The initial value of the iterative method It can perform calculation steps for n = 0, 1, ... and can be performed at position f. est,n The second-order Taylor approximation of the first derivative of S at point T n The precise calculation is then performed. Subsequently, the negative slope can be used to calculate T. n Zero point Alternatively, Newton's method can be used to iteratively determine... .

[0085] The above description of the embodiments is merely illustrative of the invention. Of course, the various features of the embodiments can be freely combined with each other as long as it is technically meaningful, without departing from the scope of the invention.

[0086] List of reference numerals

[0087] 1. Working machinery

[0088] 2 motors

[0089] 5. Network

[0090] 10 Processing Unit

[0091] 11 Receiving device

[0092] 12 Memory

[0093] 13 processors

[0094] 20 Oscillation Sensor

[0095] 50 monitoring devices

[0096] 51 Transmission device

[0097] 100 computer programs

[0098] 110 Inspection

[0099] 120 Transmission

[0100] 130 processing

[0101] 131 Frequency Analysis

[0102] 132 Recognition

[0103] 133 Calculation

[0104] 200 Detection Information

[0105] 210 Spectrum

[0106] 211 peak

[0107] f frequency

[0108] A amplitude.

Claims

1. A method for monitoring at least one working machine (1) driven by a rotating machine (2), wherein the following steps are performed: - At least one detection information (200) is detected (110) at the working machine (1), the detection information being specifically for the acceleration at the working machine (1). - The detection information (200) is transmitted (120) to the central processing unit (10) via the network (5). - The transmitted detection information (200) is processed (130) to determine the rotational speed information for monitoring, the rotational speed information being specifically for the rotational speed of the rotating machine (2). In the process (130), in order to determine the rotational speed information, the fundamental frequency of the detection information (200) and integer multiples of the fundamental frequency are normalized so that they are considered in the same way as the amplitude, so as to identify the fundamental frequency and use the identified fundamental frequency as the rotational speed information.

2. The method according to claim 1, Its features are: The rotating machine (2) is a rotating motor.

3. The method according to claim 1, characterized in that, The oscillation sensor (20) at the working machine (1) performs detection (110) for oscillations in three mutually orthogonal directions in order to determine the detection information (200) in the form of three-dimensional acceleration values.

4. The method according to claim 1, Its features are, The network (5) is at least partially implemented as a mobile radio network and / or the Internet, wherein the detection information (200) is detected at a number of working machines (1) in different locations and transmitted to the central processing unit (10) for central processing.

5. The method according to any one of claims 1-4, Its features are, The processing (130) is implemented as an oscillation analysis in order to determine the rotational speed information based on the fundamental and other harmonics of the detection information (200).

6. The method according to claim 5, Its features are: The process (130) is performed to perform the estimation of the rotational speed.

7. The method according to claim 5, Its features are, During processing (130), the fundamental frequency is determined by evaluating the harmonics in order to estimate the rotational speed therefrom.

8. The method according to any one of claims 1-4, Its features are, In order to determine the rotational speed information during processing (130), the following steps are performed: - Perform frequency analysis (131) on the detection information (200) to determine the spectrum (210) of the detection information (200). - Perform identification (132) of multiple frequencies in the spectrum (210), wherein the frequencies are assigned to the fundamental frequency and at least a pre-given number of harmonics of the detection information (200). - Perform calculations (133) based on the identified frequencies, wherein the calculations (133) are parameterized by a pre-given number of harmonics.

9. The method according to claim 8, Its features are, The identification of execution frequency (132) includes the following steps: - Identify the peak (211) in the spectrum (210) in order to identify the frequency at the peak (211), - The identified peaks (211) in the spectrum (210) are normalized so that subsequent calculations (133) can be performed based on the normalized peaks (211).

10. The method according to claim 8, Its features are, The calculation (133) includes the formation and spectrum, wherein the summation of the identified frequencies is performed in a weighted manner.

11. The method according to claim 10, Its features are: Formation and spectrum involve the addition of standardized peaks (211) performed in a weighted manner.

12. The method according to claim 10, Its features are, Frequency determination is performed based on the sum spectrum to determine the rotational speed information, wherein the rotational frequency is estimated at the maximum value of the sum spectrum for this purpose.

13. The method according to any one of claims 1, 2 and 4, Its features are, The detection information (200) is set in the form of acceleration values ​​in at least one dimension, wherein a spectrum (210) is determined from the acceleration values ​​when processing (130) for the dimension, and the amplitudes of the spectra (210) in different dimensions are summed so as to convert the spectrum (210) into a summed spectrum.

14. The method according to any one of claims 1, 2 and 4, Its features are: The detection information (200) is set in the form of acceleration values ​​in at least two dimensions, wherein when processing (130) for the dimensions, a spectrum (210) is determined from the acceleration values ​​respectively, and the amplitudes of the spectra (210) in different dimensions are summed so as to convert the spectrum (210) into a summed spectrum.

15. The method according to any one of claims 1, 2 and 4, Its features are: The detection information (200) is set in terms of acceleration values ​​in at least three dimensions, wherein a spectrum (210) is determined from the acceleration values ​​when processing the dimensions (130), and the amplitudes of the spectra (210) in different dimensions are summed in order to convert the spectrum (210) into a summed spectrum.

16. The method according to claim 10, Its features are, Interpolation is performed on the total spectrum in order to identify frequencies in the interpolated spectrum (132).

17. The method according to claim 10, Its features are, Trigonometric interpolation is performed on the total spectrum in order to identify frequencies in the interpolated spectrum (132).

18. The method according to any one of claims 1-4, Its features are, In the process (130), in order to determine the rotational speed information, the fundamental frequency of the detection information (200) and integer multiples of the fundamental frequency are considered in a weighted manner according to a predefined weight, so as to identify the fundamental frequency and use the identified fundamental frequency as the rotational speed information.

19. A system for monitoring at least one working machine (1) driven by a rotating machine (2), comprising: - Monitoring device (50) for detecting (110) at least one detection information (200) at the working machine (1), the detection information being specifically for acceleration at the working machine (1). - Transmission device (51) for transmitting (120) the detection information (200) to central processing unit (10) via network (5). The central processing unit (10) processes (130) the transmitted detection information (200) to determine the rotational speed information for monitoring, the rotational speed information being specifically for the rotational speed of the rotating machine (2). In the process (130), in order to determine the rotational speed information, the fundamental frequency of the detection information (200) and integer multiples of the fundamental frequency are normalized so that they are considered in the same way as the amplitude, so as to identify the fundamental frequency and use the identified fundamental frequency as the rotational speed information.

20. The system according to claim 19, Its features are: The rotating machine (2) is a rotating motor.

21. The system according to claim 19, Its features are, The system is implemented to perform the method according to any one of claims 2 to 18.

22. A computer program product comprising a computer program (100) for monitoring at least one working machine (1) driven by a rotating machine (2), the computer program (100) including instructions that, when executed by a processing device, cause the processing device to perform the following steps: - Receive at least one detection information (200) from the network (5), wherein the detection information (200) is specifically used for detecting acceleration at the working machine (1), - The received detection information (200) is processed (130) to determine the rotational speed information for monitoring, the rotational speed information being specifically for the rotational speed of the rotating machine (2). In the process (130), in order to determine the rotational speed information, the fundamental frequency of the detection information (200) and integer multiples of the fundamental frequency are normalized so that they are considered in the same way as the amplitude, so as to identify the fundamental frequency and use the identified fundamental frequency as the rotational speed information.

23. The computer program product according to claim 22, Its features are: The rotating machine (2) is a rotating motor.

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