EP4341845A1 - Procédé et système pour commander un système de production - Google Patents

Procédé et système pour commander un système de production

Info

Publication number
EP4341845A1
EP4341845A1 EP22761970.7A EP22761970A EP4341845A1 EP 4341845 A1 EP4341845 A1 EP 4341845A1 EP 22761970 A EP22761970 A EP 22761970A EP 4341845 A1 EP4341845 A1 EP 4341845A1
Authority
EP
European Patent Office
Prior art keywords
machine learning
product
learning module
product version
version
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22761970.7A
Other languages
German (de)
English (en)
Inventor
Stefan Depeweg
Kai Heesche
Markus Kaiser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP4341845A1 publication Critical patent/EP4341845A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/27—Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/18—Manufacturability analysis or optimisation for manufacturability

Definitions

  • Computer-aided design systems are increasingly being used to manufacture complex technical products such as robots, motors, turbines, turbine blades, internal combustion engines, tools, motor vehicles or their components.
  • Such design systems usually generate design data which specify a product to be manufactured in detail and with the aid of which production systems for manufacturing the specified product can be controlled.
  • the aim is to automatically optimize the design data for the product.
  • Such a performance can in particular be an output, a yield, a speed, a weight, a running time, a precision, an error rate, a consumption of resources, an efficiency, an emission of pollutants, a stability, a wear , a service life, a physical property, a mechanical property, an electrical property, a constraint to be met or other target values of the product.
  • MDO Multi Dimensional Optimization
  • a large number of product-version-specific training data sets are read in to control a production system for producing a first product version using design data sets of the first and a second product version.
  • the training data sets each include a design data set specifying a design variant of a respective product version and a performance value quantifying a performance of this design variant.
  • the design data sets are fed into a cross-product version machine learning module.
  • An output signal of the cross-product version machine learning module is fed into both a first and a second product version-specific machine learning module.
  • the machine learning modules are trained together so that output data from the first machine learning module reproduces the performance values of the first product version and output data from the second machine learning module reproduces the performance values of the second product version.
  • a large number of synthetic design data sets are then generated and fed into the trained cross-product version machine learning module.
  • the resulting The output signal of the trained cross-product machine learning module is fed into the trained first machine learning module.
  • a performance-optimized design data set is derived from the synthetic design data sets and output for producing the first product version.
  • a system for controlling a production system, a computer program product and a computer-readable, preferably non-volatile, storage medium are provided for executing the method according to the invention.
  • the method according to the invention and the system according to the invention can be carried out or implemented, for example, using one or more computers, processors, application-specific integrated circuits (ASIC), digital signal processors (DSP) and/or so-called “Field Programmable Gate Arrays” (FPGA).
  • the invention makes it possible to use data from optimizations and training courses that were carried out for other, in particular earlier, product versions to predict the performance of a first product version currently to be produced and to optimize it. Such use of earlier optimization or training results for machine training for a new application is often referred to as transfer learning.
  • transfer learning Using the cross-product version machine learning module, common causal relationships between design and performance of different product versions can be learned very efficiently in many cases. Training data from earlier product versions can often be used to great advantage.
  • a performance value for the design variant specified by the respective design data set can be determined in a simulation for a large number of design data sets. A respective design data set can then be used together with the respective predicted performance value as a training data set.
  • first product specifications to be fulfilled by the first product version and second product specifications to be fulfilled by the second product version can be read in.
  • the first product specifications can be fed into the first machine learning module and the second product specifications can be fed into the second machine learning module.
  • the first product specifications can then also be fed into the trained first machine learning module. In this way, correlations between product specifications, design data sets and/or performance values can be modeled or learned by the training and used to predict the performance.
  • the product version-specific machine learning modules can each implement a linear regression model and the cross-product version machine learning module can implement a Gaussian process. In this way, linear correlations between performance values of different product versions can be efficiently learned. Insofar as linear relationships can generally be modeled using relatively few parameters, in many cases only relatively few training data are required for training.
  • the machine learning modules can each include a neural network.
  • the cross-product version machine learning module can be implemented in particular by means of a multi-layer perceptron.
  • the product version-specific machine learning modules can each comprise one or more neural layers. The neural layers can also be used to efficiently learn nonlinear correlations between performance values of different product versions.
  • ⁇ can be provided, each with a cross-product version machine learning module and at least two product version-specific machine learning modules. Furthermore, a number or quantity of available training data sets can be determined. Depending on the determined number or quantity, one of the sets can then be selected to carry out the training and to derive the performance-optimized design data set. In this way, depending on the number or volume of available training data, a set of machine learning modules that is particularly suitable for this number or volume can be selected in a targeted manner. For example, one or more linear regression models for the case that only relatively little training data is available. In addition, it can be checked whether there are product specifications for the first and for the second product version.
  • Figure 1 a design system controlling a production system for the manufacture of a product
  • Figure 2 a design system according to the invention in a training phase
  • Figure 3 different sets of machine learning modules
  • Figure 4 the design system according to the invention in an application phase.
  • FIG. 1 shows a schematic representation of a design system DS coupled to a production system PS.
  • the design system DS is used for the computer-aided construction of a new version of a product PV1 that is optimized in terms of performance and for controlling the production system PS in order to produce the product version PV1 in this way.
  • the production system PS can include a manufacturing system, a robot, a machine tool and/or other devices for manufacturing or processing the product PV1 or a component thereof using design data.
  • the manufacture The product PV1 in question can in particular be a motor, a robot, a machine tool, a turbine blade, a wind turbine, a gas turbine, a motor vehicle or another machine, another technical structure or a component of these products.
  • a respective design or a respective design variant of the product version PV1 to be produced is specified by design data in the form of a respective design data record.
  • Such a design data record can in particular specify a geometry, a structure, a property, a production step, a material and/or a component of the product version PV1.
  • the design system DS is to be enabled to largely automatically generate a realistic design data set ODR that is optimized with regard to a performance of the product version PV1.
  • optimization is also understood to mean an approximation to an optimum.
  • the performance can in particular be an output, a yield, a speed, a weight, a running time, a precision, an error rate, a consumption of resources, a tendency to oscillate, a temperature stability, a rigidity, a material fatigue, an efficiency, an efficiency , pollutant emissions, stability, wear and tear, a service life, a physical property, a mechanical property, an electrical property, a secondary condition that must be complied with or other target variables of the product PV1.
  • the design system DS is trained using available design data sets for the first product version PV1 to be produced and additionally using available design data sets for at least one further product version using machine learning methods—as explained in more detail below.
  • the design system DS generates a performance-optimized design data set ODR and transmits this to the production system PS.
  • the production system PS is prompted to produce a performance-optimized new product version PV1 according to the performance-optimized design data set ODR.
  • FIG. 2 illustrates a design system DS according to the invention in a training phase.
  • the design system DS has one or more processors PROC for executing the method according to the invention and one or more memories MEM for storing data to be processed.
  • PROC processors
  • memories MEM for storing data to be processed.
  • a large number of training data sets for the first product version PV1 currently to be produced and, in addition, a large number of training data sets for at least one further product version are read in or generated.
  • the at least one further product version can in particular be an earlier version of the product to be manufactured for which performance data or further empirical values are already available. For reasons of clarity, only data and processing steps for two product versions are explicitly shown and described in the figures.
  • the training data records specific to the first product version PV1 each include a design data record DR1 specifying a design variant of the first product version PV1 and a performance value P1 quantifying the performance of this design variant.
  • the training data records specific to a second product version each include a design data record DR2 specifying a design variant of the second product version and a performance value P2 quantifying the performance of this design variant.
  • first product specifications E1 which this product version PV1 must meet, and second product specifications E2, which the second product version must meet are also read in.
  • the product version-specific product specifications E1 and E2 are fixed and, unlike the design data sets, cannot be optimized.
  • Product specifications E1 and E2 can, for example, specify a product type, product geometry, dimensions of the product, product environment, operating environment, operating specifications, boundary conditions, ancillary conditions, installation site, ambient temperature range and/or other environmental data be specified.
  • the large number of design data records DR1 and the product specifications E1 of the first product version PV1 and the large number of design data records DR2 with the associated performance values P2 and with the product specifications E2 are read in by the design system DS from a database DB.
  • the database DB includes a large number of training data sets evaluated with regard to performance, in particular also for earlier second product versions.
  • the performance values P2 can come from measurements on earlier product versions or from simulations of these earlier product versions.
  • the design data sets DR1 and the product specifications E1 are supplied to a simulator SIM of the design system DS.
  • the SIM simulator is used to simulate design variants specified by the supplied design data records, here DR1, and to simulate the respective performance, here P1, of a respective design variant of the first product version PV1.
  • a large number of known simulation methods are available for carrying out such simulations or simulators for mechanical, electrical or thermal simulation.
  • the design data records DR1 are transmitted together with the associated performance values P1 determined by simulation and with the product specifications E1 from the simulator SIM to a selection module SEL of the design system DS.
  • the design data sets DR2 with the associated performance values P2 and the product specifications E2 are fed into the selection module SEL.
  • Several sets SL1, SL2 and SL3 of machine learning modules are coupled to the selection module SEL or can at least be addressed by the selection module SEL.
  • the selection module SEL serves the purpose of selecting one of the sets SL1, SL2 or SL3 depending on the presence of product specifications, here E1, E2, and depending on a quantity or number of available training data sets.
  • the number or set of training data sets is determined by the selection device SEL.
  • a number or quantity of training data sets with high performance values can be determined in this case, insofar as such training data sets are particularly relevant for an evaluation of high-performance design variants.
  • the selection module SEL checks whether product specifications, here E1, E2, are present for both product versions and whether product parameters common to both product versions relate.
  • the different sets SL1, SL2 and SL3 of machine learning modules are shown schematically in FIG.
  • the set SL1 includes a cross-product version machine learning module LG_1 as well as product version-specific machine learning modules L1_1 and L2_1.
  • the set SL2 includes a cross-product version machine learning module LG_2 as well as product version-specific machine learning modules L1_2 and L2_2.
  • the set SL3 includes a cross-product version machine learning module LG_3 as well as product version-specific machine learning modules L1_3 and L2_3.
  • the product version On-specific machine learning modules L1_1, L1_2 and L1_3 are assigned to the first product version PV1, while the product version-specific machine learning modules L2_1, L2_2 and L2_3 are assigned to the second product version.
  • a respective set SL1, SL2 or SL3 should be trained in the event of its selection to predict a performance of a first product version PV1 specified thereby and a performance of a second product version specified hereby using fed-in design data sets relevant set SL1, SL2 or SL3 respectively supplied the design data sets DR1 and DR2 as input data.
  • Output data O1 and O2 are derived and output from the input data DR1 and DR2 by the relevant record SL1, SL2 or SL3.
  • the product specifications E1 and E2 are also fed to the record SL3 as input data.
  • An actual performance value of a design variant specified by the design data records DR1 or DR2 should be reproduced as well as possible by the output data O1 and O2.
  • Training is generally understood to mean an optimization of a mapping from input data, here DR1, DR2 and possibly E1 and E2, to output data, here O1 and O2. This mapping is optimized according to predetermined criteria during a training phase.
  • a prediction error or reproduction error in the case of prediction models, a classification error in the case of classification models and/or a deviation from an optimized control action in the case of control models can be used as criteria here, for example.
  • model parameters, process parameters, network structures of neurons in a neural network and/or weights of connections between the neurons can be set or optimized in such a way that the criteria be fulfilled as well as possible.
  • the training can thus be understood as an optimization problem.
  • a large number of efficient optimization methods are available for such optimization problems.
  • genetic optimization methods, gradient descent methods, back propagation methods and/or particle swarm optimization can be used.
  • the fact that similar product versions have similar causal relationships or correlations between design data sets and performance values should be used for the training.
  • By training a common machine learning module for different but similar product versions common causal relationships or correlations can usually be learned very efficiently.
  • cause-and-effect relationships or correlations that differ between different product versions can be efficiently mapped using product version-specific machine learning modules.
  • Efficient, so-called transfer learning can be implemented in this way, in which training results or training data from earlier product versions are advantageously used for a current product version to be produced, here PV1.
  • the different sets SL1, SL2 and SL3 of machine learning modules make it possible, depending on the amount of available training data or product specifications, to select that one of the sets SL1, SL2 or SL3 that is particularly suitable for the respective training circumstances.
  • the sets SL1, SL2 and SL3 shown by way of example in FIG. 3 are described in more detail below.
  • the machine learning module LG_1 that is common to both product versions and across product versions preferably implements a Gaussian process and/or a Bayesian model, while the product version-specific machine learning modules L1_1 and L2_1 each implement a linear regression model.
  • the design data sets DR1 and DR2 are fed into the common machine learning module LG_1 as input data.
  • An output signal OS of the common machine learning module LG_1 derived from the input data DR1, DR2 is fed both into the machine learning module L1_1 and into the machine learning module L2_1.
  • the machine learning module L1_1 derives and outputs the output data O1 from the output signal OS and the machine learning module L2_1 derives the output data O2.
  • Such a set of machine learning modules is often also referred to as a coregionalization model.
  • the linear regression models L1_1 and L2_1 can be used to learn linear relationships between the performance values of different product versions very efficiently.
  • Such linear regression models can also be modeled using relatively few parameters, for the optimization of which in many cases a relatively small amount of training data is sufficient. Consequently, in the present exemplary embodiment, the set SL1 is selected by the selection module SEL when the available amount of training data is relatively small and, for example, falls below a predetermined threshold value.
  • the set SL2 comprises an artificial neural network, in particular a multi-layer perceptron as the machine learning module LG_2 common to the product versions.
  • the product version-specific machine learning modules L1_2 and L2_2 are each designed as an artificial neural network made up of one or more layers.
  • the layers can have a linear or non-linear effect.
  • the design data records DR1 and DR2 are fed into the common machine learning module LG_2 as input data. From this, the common machine learning module LG_2 derives an output signal OS, which is fed both into the machine learning module L1_2 and into the machine learning module L2_2. From the output signal OS, the machine learning module L1_2 Output data O1 and output data O2 derived and output by the machine learning module L2_2.
  • the product version-specific machine learning modules L1_2 and L2_2 can also be used to model or reproduce a non-linear relationship between the performance of different product versions.
  • the set SL2 is thus preferably selected by the selection model SEL when a larger amount of training data is available or when this amount exceeds a predetermined threshold value.
  • the set SL3 includes the machine learning module LG_3 that is common to both product versions, as well as the product version-specific machine learning modules L1_3 and L2_3.
  • the machine learning modules LG_3, L1_3 or L2_3 can each be implemented using an artificial neural network and/or using a Gaussian process.
  • record SL3 can also explicitly process product version-specific product specifications, here E1 and E2, and model them with regard to their correlation with design data records and/or performance values.
  • the design data sets DR1 and DR2 are fed as input data into the common machine learning module LG_3, which derives an output signal OS from them and feeds this into both machine learning modules L1_3 and L2_3.
  • the product specifications E1 are fed into the machine learning module L1_3 as additional input data
  • the product specifications E2 are fed into the machine learning module L2_3 as additional input data.
  • the machine learning module L1_3 derives and outputs output data O1 from the output signal OS and the product specifications E1.
  • the machine learning module L2_3 derives and outputs output data O2 from the output signal OS and the product specifications E2. Due to the additional consideration of the product version specific product specifications E1 and E2 by the product version-specific machine learning modules L1_3 and L2_3, correlations between product specifications, design data sets and performance values can be recognized and learned in many cases. However, due to the additional differentiation options provided by the product specifications E1 and E2, more training data is generally required for efficient training than when training the other sentences SL1 and SL2. Accordingly, the record SL3 is preferably selected by the selection module SEL when product version-specific product specifications, here E1 and E2, are present and a quantity of training data exceeds a specified threshold value.
  • a respective sentence or machine learning module may also include a Bayesian neural network, a recurrent neural network, a convolutional neural network, an autoencoder, a deep learning architecture, a support vector machine, a k-nearest-neighbor classifier, and /or include a decision tree.
  • a Bayesian neural network a recurrent neural network
  • a convolutional neural network a convolutional neural network
  • an autoencoder e.g., a deep learning architecture
  • a support vector machine e.g., a number of training data sets determined by the selection module SEL therefore exceeds a threshold value provided for the set SL3.
  • the record SL3 is selected by the selection module SEL—as FIG. 2 further illustrates. Accordingly, the design data records DR1 with the product specifications E1 and the design data records DR2 with the product specifications E2 are specifically forwarded by the selection module SEL to the selected record SL3 as input data. From the input data DR1, E1, DR2 and E2, the record SL3, as described above, the output data O1 and O2 are derived and output. The output data O1 are then compared with the performance values P1 and the output data O2 with the performance values P2, and a deviation D is determined.
  • the deviation D is fed back to the record SL3.
  • the machine learning modules LG_3, L1_3 and L2_3 contained in record SL3 are trained together to minimize the deviation D.
  • the machine learning modules LG_3, L1_3 and L2_3 of record SL3 is trained to predict the associated performance values P1 and P2 for design variants of both product versions for given design data records DR1 and DR2 and product specifications E1 and E2 through their output data O1 and O2, respectively.
  • the cross-product version machine learning module LG_3 similarities between different product versions can be learned efficiently.
  • differences between the product versions can be mapped by the product version-specific machine learning modules L1_3 and L2_3.
  • FIG. 4 illustrates the trained design system DS when generating a performance-optimized design data set ODR.
  • a multiplicity of synthetic design data records DR1 are generated by a generator GEN of the design system DS, each of which specifies a design variant of the first product version PV1 to be produced. The generation is at least partially randomly induced.
  • the synthetic design data sets DR1 are fed into the selection module SEL by the generator GEN.
  • the product specifications E1 for the first product version PV1 are also supplied to the selection module SEL.
  • the selection module SEL then feeds the synthetic design data sets DR1 and the product specifications E1 into the selected and trained set SL3 in a targeted manner.
  • the synthetic design data sets DR1 are fed to the common machine learning module LG_3 as input data.
  • the resultant output signal OS of the common machine learning module LG_3 and the product specifications E1 are then fed as input data into the machine learning module L1_3 specific to the first product version PV1 to be produced.
  • the output data O1 derived from this by the machine learning module L1_3 are output and fed into an optimization module OPT of the design system DS.
  • the synthetic design data records DR1 are also supplied to the optimization module OTP.
  • the optimization module OPT derives a performance-optimized design data set ODR from the synthetic design data sets DR1.
  • the synthetic design data set for which the highest performance value O1 is predicted can be selected as the performance-optimized design data set ODR.
  • the performance-optimized design data set ODR can be interpolated from a number of synthetic design data sets with the highest or particularly high predicted performance values O1.
  • the performance-optimized design data set ODR derived from the synthetic design data sets DR1 is then output in order to control the production system PS, as described in connection with FIG. 1, for producing the optimized product version PV1.

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Abstract

Pour commander un système de production (PS) en vue de produire une première version de produit (PV1), une pluralité d'ensembles de données d'entraînement spécifiques à ladite version de produit sont respectivement importées pour plusieurs versions de produit. Les ensembles de données d'entraînement comprennent respectivement un ensemble de données de conception (DR1, DR2) spécifiant une variante de conception d'une version de produit respective, ainsi qu'une valeur de performance (P1.1P2) pour cette variante de conception. Les ensembles de données de conception (DR1, DR2) sont introduits dans un module d'apprentissage machine (LG_3) commun à toutes les versions de produit. Un signal de sortie (OS) du module d'apprentissage machine (LG_3) commun à toutes les versions de produit est introduit aussi bien dans un premier module d'apprentissage machine (l1_3) que dans un deuxième module d'apprentissage machine (l2_3) spécifique à la version de produit. Les modules d'apprentissage machine (LG_3, l1_3, l2 _3) sont entraînés conjointement de manière que des données de sortie (O1) du premier module d'apprentissage machine (l1_3) reproduisent les valeurs de performance (P1) de la première version de produit et les données de sortie (O2) du deuxième module d'apprentissage de machine (l2_3) reproduisent les valeurs de performance (P2) de la deuxième version de produit. Ensuite, une pluralité d'ensembles de données de conception de synthèse (DR1) est générée et introduite dans le module d'apprentissage machine (LG_3) entraîné commun à toutes les versions de produit. Le signal de sortie (OS) résultant du module d'apprentissage machine (LG_3) entraîné commun à toutes les versions de produit est introduit dans le premier module d'apprentissage machine (l1_3) entraîné. En fonction de ses données de sortie (O1) résultantes, un ensemble de données de conception (ODR) optimisé en termes de performance est dérivé des ensembles de données de conception de synthèse (DR1) et sorti pour produire la première version de produit (PV1).
EP22761970.7A 2021-08-06 2022-08-02 Procédé et système pour commander un système de production Pending EP4341845A1 (fr)

Applications Claiming Priority (2)

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EP21190143.4A EP4131053A1 (fr) 2021-08-06 2021-08-06 Procédé et système de commande d'un système de production
PCT/EP2022/071739 WO2023012180A1 (fr) 2021-08-06 2022-08-02 Procédé et système pour commander un système de production

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