68 results about "Modal testing" patented technology

According to the test case level-to-level management system provided by the invention, a dynamic perception-intelligent decision-accurate execution closed-loop system is constructed through cooperative operation of the intelligent arrangement center module, the multi-modal test fusion module and the heterogeneous execution environment adaptation module. Real-time dynamic allocation of test resources is realized based on a bidirectional sensing mechanism, and the resource utilization rate is improved; a data feedback channel of five-dimensional linkage of interface testing, function testing, UI testing, performance testing and safety testing is established through a multi-modal testing fusion module, and cross-modal conversion and multiplexing are carried out on key testing elements such as boundary value cases and safety injection points, so that the coverage rate of a testing scene is increased, and the defect escape rate is reduced; the heterogeneous execution environment adaptation module realizes automatic identification and accurate matching of a virtual machine, a container and a physical machine environment based on a feature fingerprint database, manual configuration errors are eliminated, environment adaptation time consumption is reduced, the test period is greatly shortened, and the defect positioning efficiency is greatly improved.

The invention provides an automatic calibration method and system for an inertial measurement unit, and electronic equipment, and relates to the technical field of sensors, the method comprises the following steps: building an IMU multi-modal calibration environment, and deploying multiple groups of reference sensors; designing a working environment test parameter table, performing simulation test on the to-be-calibrated IMU, and synchronously recording IMU multi-modal test data and multi-modal reference data; establishing an error parameter model; and constructing a calibration multi-objective function, performing minimization solution on the error parameter model, and performing closed-loop optimization correction on the to-be-calibrated IMU. According to the method and the device, the technical problems that in the prior art, as IMU error calibration is usually carried out in an ideal environment state, complex coupling errors caused by a multi-factor coupling effect are neglected, the compensation precision of calibration parameters under complex actual working conditions is seriously reduced, and IMU output drift is remarkably increased are solved; and the output precision of the IMU in a full working condition environment and the robustness of calibration parameters are improved.

The invention provides an acoustic modal test method and device, electronic equipment and a storage medium, and the method comprises the steps: controlling at least one sound source device to output a preset audio signal at the same time; acquiring response signals detected by the plurality of sensors; the plurality of sensors are used for respectively executing sound detection at a plurality of detection positions in a compartment area; establishing a geometric model based on the audio signal, the detection position and a response signal detected by the sensor; and analyzing the geometric model to obtain an acoustic modal test result. According to the embodiment of the invention, the acoustic modal test result measured by the method is beneficial to improving the riding experience of passengers.

The invention relates to the technical field of modal tests, and discloses a modal test method and system based on environment control, and the system comprises an environment simulation module which is configured to set environment scene parameters according to experiment requirements; the test platform module is configured to limit and fix the tested structural member; the excitation module is configured to switch excitation modes according to the environment scene parameters and the structural characteristics of the tested structural component and excite the tested structural component; the data acquisition module is configured to acquire test data of the tested structural member; the data processing module is configured to pre-process the test data and perform modal analysis based on the pre-processed test data; and the evaluation module is configured to visually display the modal analysis result and perform structure evaluation based on the modal analysis result. According to the invention, the modal test automation and intelligence of the tested structural member in various environment scenes are realized.

This application proposes a small-scale universal modal testing device for rockets, comprising a suspension mechanism for suspending the rocket body and a testing mechanism with an impact end, wherein the impact end can impact the rocket body around a first axis. It also includes a drive mechanism for driving the impact end to impact the rocket body, and a testing platform for mounting the suspension mechanism and the testing mechanism. In use, the impact end is rotated around the rocket body with the first axis as the center and stopped at a suitable position. At this point, the drive mechanism drives the impact end to impact the rocket body. Compared to existing technologies that only include four impact points (left, right, top, and bottom), the impact end that can surround the rocket body has more impact positions, allowing for more flexible adjustment and facilitating the simulation of multi-position impact tests.

The invention provides a modal test method and device, a readable storage medium and a modal test component. The modal testing method is applied to a modal testing assembly, the modal testing assembly comprises a laser target and a laser tracking device, the laser target is arranged on a to-be-tested object, the laser tracking device and the laser target are correspondingly arranged, and the modal testing method comprises the steps that under the condition that the to-be-tested object is subjected to impact excitation, a force signal of impact excitation is obtained; performing laser tracking on the laser target through a laser tracking device, and determining a first displacement signal of the laser target; and determining a modal test result of the to-be-tested object according to the force signal and the first displacement signal. According to the embodiment of the invention, the detection efficiency and accuracy of modal testing are improved.

The process adaptability pilot test verification evaluation method and system for the aviation structural part machining machine tool comprises the steps that the comprehensive geometric error, the motion linkage error and the machining process dynamic error of the machine tool are obtained, and a comprehensive precision evaluation model of the machine tool is established; based on a comprehensive precision evaluation model, processing efficiency adaptability evaluation is carried out on the machine tool; establishing a thermal characteristic model of the machine tool through heat source analysis, temperature field monitoring and thermally induced error modeling; establishing a resonance characteristic model of the machine tool through modal test of the whole machine and key parts and resonance characteristic evolution analysis in a processing space; and performing comprehensive process adaptability evaluation on the machine tool by combining the comprehensive precision evaluation model, the thermal characteristic model of the machine tool and the resonance characteristic model of the machine tool, and performing process adaptability pilot test verification on the machine tool based on an evaluation result.

The invention discloses a high-precision modal test method and related equipment, and belongs to the technical field of structural dynamics tests.The method comprises the steps that spring design parameters are obtained, and spring design variables are initialized and generated; calculating stress field characteristic parameters based on the spring design parameters and the spring design variables; evaluating stress field characteristic parameters based on preset stress field constraint conditions; under the condition that the stress field characteristic parameters meet the stress field constraint conditions, spring design variables are output to serve as spring design results; and preparing a spring based on a spring design result, and completing a modal test. According to the method, the stress field quantification constraint condition is introduced in the modal test instrument spring design stage, the characteristic parameters of the modal test instrument spring are evaluated, the modal test instrument spring design precision and reliability can be effectively improved, the spring design iteration period is remarkably shortened, the modal test precision and stability are improved, and the modal test efficiency is improved. And the design requirement of the high-reliability spring is effectively met.

The invention relates to the technical field of selenium drum circulation, and particularly discloses a selenium drum recycling and replacing system and a control method.The method comprises the steps that firstly, quantitative characterization of subsurface defects and local mechanical properties is conducted on waste metal core base materials through microwave resonance and nanoindentation multi-source fusion detection, and a base material state quantitative data set is generated; performing multi-physical field transient simulation by taking the data set and target coating parameters as input, and predicting an interface residual stress score in a regeneration process; based on a prediction result, reversely solving a dynamic temperature control sequence and gradient material matching scheme; in a vacuum coating environment, active stress compensation coating is realized, transient thermal excitation modal testing is performed on the regenerated toner cartridge, high-frequency dynamic characteristics of the regenerated toner cartridge are extracted and compared with a simulation predicted value, simulation model parameters are optimized according to deviation data feedback, closed-loop control is formed, and the interface bonding strength and long-term imaging reliability of the regenerated toner cartridge are improved.

The application discloses a sensor position selection method, device and medium in a modal test process, which is characterized by the following steps: establishing a correlation matrix MAC 12 , MAC 13 ,..., MAC ij , calculating the contribution degree value of a preselected sensor preselected position point to each order modal, deleting the preselected sensor position point with a negative contribution degree, and continuously adjusting the correlation matrix so that the remaining preselected sensor position points meet the different order modal vibration mode requirements, thereby realizing automatic matching of the preselected sensor position points to the measurement requirements, improving the sensor positioning accuracy, and eliminating the need for manual repeated intervention for modal measurement of the sensor arrangement position.

This invention belongs to the field of structural dynamics testing and modal analysis technology, and provides a physical / mathematical integrated experimental modal analysis method, system, equipment, and medium. The method includes: applying preliminary excitation and using the phase separation method to obtain preliminary modal parameters containing mode shapes; constructing a mode shape matrix based on the mode shapes and optimizing the position and number of exciters to ensure that the modal participation values ​​of all modes of interest are not lower than a preset threshold; performing refined excitation according to the optimized scheme, locking the resonance state using the phase resonance method, and obtaining the final modal parameters. This invention effectively solves the problems of blind excitation point placement, modal confusion, and mode omission by coordinating three stages: phase separation initial screening, mode shape-driven excitation optimization, and phase resonance fine measurement. It significantly improves the integrity, accuracy, and efficiency of modal testing of large structures and reduces experimental safety risks. It is applicable to ground vibration tests of complex structures such as aircraft, spacecraft, and bridges.

The invention provides an automatic verification test method and system for a recording system, and belongs to the technical field of software testing, and the method comprises the steps: constructing a multi-modal test scene library, and configuring multi-dimensional test parameters for each test scene in the scene library; responding to the test triggering instruction, calling a target test scene, automatically generating multi-modal test data according to multi-dimensional test parameters in the target test scene, and injecting the multi-modal test data into the recording system to trigger the recording system to run; in the operation process of the recording system, collecting multi-modal response data of the recording system for the multi-modal test data in real time; and according to the expected result of the target test scene and the multi-modal response data, carrying out automatic verification analysis, and generating a test result. According to the method, the test scene library containing the multi-dimensional parameters is constructed, the multi-modal test data is automatically generated and injected to drive the system to run, and the multi-modal response data is collected in real time for verification, so that the test accuracy of the recording system is remarkably improved.

The application discloses a kind of for vehicle tire static load modal test excitation loading mechanism, including work type base and sample piece fixed pedestal, the top main shaft end of sample piece fixed pedestal is equipped with wheel hub adapter, the back of fixed plate is provided with Z direction stiffness measurement scale, horizontal excitation platform is provided on main loading platform, the bottom end surface central place of horizontal excitation platform is equipped with rolling bearing, the bottom of main loading platform is supported by two groups of air spring, and horizontal excitation platform is fixedly assembled with exciter by the exciter mounting seat of the outside of main loading platform.The method of Z direction static load loading and X, Y, Z direction excitation on static load loading surface to the tire piece to be measured can be realized simultaneously in the application;The structural design of main loading platform and horizontal excitation platform satisfies the demand of structural strength, first-order natural frequency, self-weight light weight, realizes the demand of "loading surface is excitation surface", so that the test result of test rig is closer to the vibration transmission characteristics under actual working condition.

The utility model relates to the technical field of liquid shaking testing equipment, and discloses a storage tank liquid modal testing device, which is characterized in that a support frame is arranged in the middle of a device base, a vibration exciter and a liquid adding and discharging device are respectively arranged on two sides of the support frame, a mobile platform is arranged below the support frame, and a flexible pull rod is arranged at each of four corners of the mobile platform. The upper and lower ends of the flexible pull rod are fixedly connected with the support frame and the mobile platform respectively; the shaft vibration exciter is fixedly connected with the movable platform through a push-pull rod; and an experiment storage box is arranged on the mobile platform and is fixedly connected with the mobile platform through a storage box clamp. The device can achieve diversified simulation of different liquid working conditions and modal characteristics, is compact in size, can be used for various scenes such as laboratories and industrial sites, and has high applicability.

The invention relates to a modeling method and a modeling system for modal calculation of a stator assembly of a motor. The modeling method comprises the following steps: S1, carrying out modal test on a sample piece of a stator assembly of a motor to obtain a modal shape of the stator assembly and a corresponding modal inherent frequency test value; s2, establishing an actual three-dimensional geometric model of the stator assembly according to the sample piece, and determining characteristic parameters and size parameters of the actual three-dimensional geometric model; s3, based on the characteristic parameters and the size parameters of the actual three-dimensional geometric model, a finite element model of the stator assembly is established, and the stator assembly is modeled into a circular ring cylinder through the finite element model, and S4, material attribute setting is conducted on the finite element model; s5, performing modal calculation on the finite element model subjected to material attribute setting to obtain a corresponding modal inherent frequency calculation value, and S6, comparing the modal inherent frequency calculation value with a modal inherent frequency test value, and adjusting a rigidity correction coefficient according to a comparison result until a difference value between the two values is smaller than a preset threshold value.

The invention relates to a factory building internal load identification method and system, belongs to the technical field of vibration testing, and solves the problem of low measurement precision of weak and coupled multi-power loads in a factory building process area in the prior art. The method comprises the following steps: determining a modal excitation point and a modal test point, collecting an excitation signal and an excitation vibration response signal when a plant is in a non-operation state, and identifying modal parameters of the plant; building a finite element model of the factory building, obtaining a finite element simulation result, and updating the finite element model according to the finite element simulation result and the modal parameters; determining a vibration response measuring point, collecting a vibration response signal of the equipment when the plant is in an operation state, and determining a real spectral response; according to the updated finite element model, obtaining a simulation response corresponding to the vibration response measuring point; and determining the internal load of the plant according to the simulation response, the equipment vibration response signal and the real spectral response. And high-precision and strong-anti-interference weak dynamic load identification in a complex vibration source environment is realized.

The invention discloses an industrial robot modal test measuring point selection method based on a modal kinetic energy method, and relates to the technical field of industrial robot modal test. On the basis of a traditional modal kinetic energy method, a comprehensive modal kinetic energy weight index is introduced, the index comprises a modal kinetic energy weight factor and a direction effectiveness coefficient, and therefore the problems that in industrial robot application of a traditional method, local modals are ignored, sensor direction matching is insufficient, and modals of different parts are processed in an equal weight mode are solved; nodes with large modal kinetic energy are screened out through iterative updating, an optimal measuring point is selected, and finally an acceleration sensor is arranged to complete experimental modal testing; according to the method, the local modality can be effectively identified, the rationality of measuring point arrangement and the accuracy of modal parameter identification are improved, modal loss is avoided, and reliable data support is provided for structural optimization and dynamic performance improvement of the industrial robot.

The invention discloses a contact parameter calculation method for improving case random vibration simulation precision based on modal testing. The contact parameter calculation method comprises the following steps: S1, providing a plate part, a frame part and an assembly thereof; s2, performing part modal simulation and part modal testing on the plate part and the frame part respectively to determine material parameters of the plate part and the frame part; and S3, performing assembly body modal simulation and part modal test on the assembly body to determine the contact type and the stiffness parameter of the assembly body, and obtaining contact stiffness parameters under different connection distances in combination with an interpolation algorithm. The method has the beneficial effects that the calculated contact parameters can improve the precision of a simulation model and the accuracy of a random vibration result, and the product reliability is guaranteed while the weight is reduced.

The invention provides a lifting structure modal test method and system. The invention discloses a lifting structure modal test method. The method comprises the following steps: mounting a detection mechanism and a locking mechanism on each lifting tower of a lifting structure; the lifting tower of the lifting structure is lifted; the lifting tower is locked and excited through the locking mechanism; and the modal information of the lifting structure is detected through the detection mechanism. The locking mechanisms are designed between the lifting tower sections for restraining and supporting, when the lifting structure is lifted in place, self-excited vibration generated when the locking mechanisms of the tower sections are locked serves as excitation, the detection mechanism is used for collecting signals, and modal testing of the heavy-load high lifting structure can be completed.

The invention provides an adjustable suspension device for a modal test of a solid rocket engine. The adjustable suspension device comprises a suspension belt, an adjustable suspension beam assembly, two chain blocks and two groups of adjustable suspension rope assemblies, the adjustable lifting beam assembly comprises a supporting cross beam and two adjustable connecting assemblies, and each adjustable connecting assembly is hinged to one lifting lug; the supporting cross beam is provided with a sliding groove used for sliding of the adjustable connecting assembly. The adjustable lifting rope assembly comprises an upper supporting plate, a lower supporting plate and an elastic lifting rope. The upper supporting plate and the lower supporting plate are connected into a whole through the elastic lifting rope. A solid rocket engine test piece is hung at the lower end of the adjustable lifting rope assembly; and the adjustable suspension device is suspended on a crane by the suspension belt. According to the adjustable hanging beam assembly designed by the invention, the problem that a traditional hanging device cannot realize distance adjustment below 3m is solved, the number of stressed elastic hanging ropes is quickly adjusted according to parameters of different solid rocket engine test pieces, the rigidity and the bearing strength of the adjustable hanging device are changed, and the modal test efficiency and the test accuracy are improved.

The present application belongs to the technical field of mechanical structure, and particularly relates to a method for reducing working vibration of a gear of a helicopter transmission system. The method uses a three-dimensional model of the gear or the gear ring and finite element calculation to obtain the first four modal frequencies. According to the gear structure, slots are formed at the gear web, the inner and outer diameters of the gear ring, or the gear weight-reducing holes before static or dynamic balancing of the gear. A damping ring or a damping block is installed at the slots, and then modal testing is performed. By adjusting the damping ring or the damping block, the working vibration is relatively reduced, and the processability and maintainability of the large gear are improved. The method can reduce harmful working vibration of the gear or the gear ring without changing the original structure, does not additionally increase the weight of the gear or the gear ring, and has repeatability. The method can be repeatedly improved according to the modal test results of each adjustment to achieve the best effect of reducing harmful working vibration.

The invention particularly relates to an industrial robot milling stability prediction method considering structural nonlinearity. The industrial robot milling stability prediction method comprises the steps that frequency response functions under different exciting forces are obtained through a modal test experiment; performing fairing processing on the frequency response function to obtain a frequency response function after fairing; identifying modal parameters by using a frequency domain decomposition method; in combination with the identified modal parameters, obtaining a fitting model of the exciting force and the modal mass, the modal stiffness and the modal damping; based on a fitting model of the exciting force and the modal mass, the modal stiffness and the modal damping, establishing a mapping database of the nonlinear modal parameters and the exciting force in each direction; and based on the mapping database of the nonlinear modal parameters and the exciting force in each direction, establishing a dynamic differential equation of the compensation mapping model, and solving the dynamic differential equation of the compensation mapping model through a full discrete method to obtain a milling stability lobe graph. By means of the method, stability prediction under different feeding speeds in the milling machining process of the robot can be achieved.

The utility model discloses a tire modal testing device, which comprises a vibration exciter, a support assembly and a suspension assembly, and is characterized in that the vibration exciter is used for exciting a tire; the supporting assembly comprises a frame and a supporting plate arranged at the bottom of the frame, the supporting plate is provided with a first guide rail in the first direction, and the vibration exciter is installed on the first guide rail and can move along the first guide rail; the suspension assembly is arranged in the second direction, the second direction is perpendicular to the horizontal plane where the first direction is located, and the suspension assembly is used for suspending the tire so that the tire can be arranged above the vibration exciter. According to the utility model, the vibration exciter is adopted to excite the tire, so that the detection efficiency of the modal test of the tire can be improved, the problem that the force and the accuracy are difficult to control when the tire is manually knocked is avoided, the test data deviation caused by human factors is reduced, and the accuracy of the test data is improved; the vibration exciter is installed on the first guide rail of the supporting plate and can move along the first guide rail, and the working area of the vibration exciter is enlarged so as to meet the tire modal test requirements of various working conditions.

The application discloses a vehicle body modal prediction method, device and equipment and a storage medium, relates to the technical field of vehicle vibration analysis and modal testing, and discloses a vehicle body modal prediction method, which comprises the following steps: acquiring the vehicle type, a vehicle body attachment point and a vehicle body longitudinal beam of a preset vehicle body; performing attachment point dynamic stiffness testing according to the vehicle body attachment point to obtain an attachment point dynamic stiffness testing result; performing modal testing according to the vehicle body longitudinal beam to obtain a vibration mode description; constructing attachment point dynamic stiffness historical data and preset vehicle body modal historical data according to at least two of the vehicle type, the attachment point dynamic stiffness testing result and the vibration mode description; and predicting the vehicle body modal of a to-be-tested vehicle type according to the attachment point dynamic stiffness historical data and the preset vehicle body modal historical data. Through the technical means of combining attachment point dynamic stiffness testing and modal testing, the vehicle body modal of the to-be-tested vehicle type is accurately predicted.

The invention discloses a metal material Young modulus measurement method based on modal test and simulation, which comprises the following steps: carrying out modal test on a metal component of a specified metal material to obtain the front n-order actually measured inherent frequency of the metal component; obtaining a geometric model of the metal component, and establishing a finite element model; obtaining measurement characteristics of the metal component, wherein the measurement characteristics comprise initial material parameters and boundary constraint conditions; finite element simulation calculation is conducted, the Young modulus serves as a variable, and the first n-order simulation inherent frequency of the metal component is obtained; the value of the Young modulus and the corresponding first n-order simulation inherent frequency form analysis data; and constructing a frequency error objective function, and obtaining a Young modulus optimal value based on the analysis data. According to the technical scheme, the testing process can be simplified, the arrangement number of the sensors and the data processing complexity are reduced, and the method is widely applied to non-destructive elastic modulus detection of various metal components with complex structures.

The invention discloses a thin film solar wing low-frequency modal test method based on suspension gravity unloading, solves the problem of insufficient test result precision in the prior art, and belongs to the technical field of space solar wings. The test method comprises the following steps: 1, fixedly connecting the solar wing with the simulation wall; the solar wing is suspended by a rigid rope to be in a wing surface complete unfolding state; 2, selecting modal test points, and pasting target points; 3, designing a large flexible suspension device formed by connecting a flexible rope and a rigid rope in series; 4, a solar wing large-flexibility suspension device is installed, the planeness of the solar wing is adjusted, and gravity unloading of the solar wing is completed; 5, arranging a laser vibration meter, and adjusting an observation angle; 6, a vibration exciter, a vibration excitation point and a vibration excitation mode are selected, and the vibration exciter is installed; 7, starting a laser vibration meter, starting a vibration exciter, and carrying out a modal test; and 8, collecting test data, and carrying out modal parameter calculation and analysis. According to the method, the vibration and modal characteristics of the thin film solar wing in the in-orbit weightless environment can be accurately obtained.

The present application belongs to the technical field of milling processing, and discloses an incremental self-excitation method for identifying the low-frequency frequency response function of a milling robot. The method comprises the following steps: S1, in a preset standard posture, an incremental self-excitation experiment is performed by using a mass block, then a modal test is performed at a tool center point of the robot to obtain a frequency response function of the robot in the preset standard posture, and the frequency response function is used to solve an inertial self-excitation of the robot in the preset standard posture; S2, the robot again performs an incremental self-excitation experiment by using the mass block in a target posture in which the frequency response function needs to be identified, and the impulse and impulse moment of the mass block at the end of the robot during the experiment are calculated; S3, the frequency response function of the robot in the target posture is solved by using the impulse and impulse moment of the mass block and the inertial self-excitation of the robot in the preset standard posture. Through the present application, the identification of the frequency response function of the robot in any posture is solved.

The invention discloses a multi-batch three-dimensional sensor optimization layout method in a modal test, which is used for extracting candidate sensor positions from a finite element model and solving the optimization problem by simultaneously considering a reference sensor and a mobile sensor. Firstly, a modal addition method is carried out on candidate sensor positions extracted from a finite element model, a reference sensor candidate set is selected, then an improved three-dimensional independence criterion and a minimum variance criterion of structural response estimation errors are combined, and three-dimensional sensor optimization layout is achieved by optimizing a batch with the worst objective function result. According to the method, the modal test precision of a large-scale structure or a complex structure can be effectively improved.

The application relates to a penetration test method, device and computer equipment for a nursing robot. The method comprises the following steps: scanning firmware equipment and an operating system of a to-be-tested robot to obtain information test results of the to-be-tested robot; acquiring image information and voice information collected by the to-be-tested robot, respectively performing disturbance processing on the image information and the voice information to obtain disturbed image information and disturbed voice information, and obtaining multi-modal test results based on current execution results of the to-be-tested robot on the disturbed image information and the disturbed voice information; injecting a fake force feedback signal into a mechanical arm control system of the to-be-tested robot, and obtaining physical test results according to pressure detection results of the mechanical arm control system; and obtaining penetration test results of the to-be-tested robot according to the information test results, the multi-modal test results and the physical test results. The method can comprehensively test the nursing robot.

The invention relates to the technical field of hydro-generator vibration, in particular to a hydro-generator vibration anomaly detection method, device and equipment and a computer readable storage medium, and the method comprises the steps: constructing a detection system, determining a knocking point and a response point on a hydro-generator rack, and arranging an acceleration sensor at the response point; hammering excitation is conducted on the knocking point through a vibration exciter, and a response signal detected by an acceleration sensor and an excitation signal detected by a force sensor in the vibration exciter are obtained; based on the excitation signal and the response signal, fitting to obtain the inherent frequency of the rack; and comparing the inherent frequency of the rack with the excitation frequency during the operation of the unit, and judging whether the unit resonates or not. The inherent frequency, the damping ratio and the vibration mode of the rack are measured by adopting a modal test method, and then whether internal damage or resonance occurs to the rack of the hydro-generator is judged according to the inherent frequency, the damping ratio and the vibration mode of the rack, so that the safety and the reliability of unit operation are greatly improved.