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103 results about "Describing function" patented technology
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In control systems theory, the describing function (DF) method, developed by Nikolay Mitrofanovich Krylov and Nikolay Bogoliubov in the 1930s, and extended by Ralph Kochenburger is an approximate procedure for analyzing certain nonlinear control problems. It is based on quasi-linearization, which is the approximation of the non-linear system under investigation by a linear time-invariant (LTI) transfer function that depends on the amplitude of the input waveform. By definition, a transfer function of a true LTI system cannot depend on the amplitude of the input function because an LTI system is linear. Thus, this dependence on amplitude generates a family of linear systems that are combined in an attempt to capture salient features of the non-linear system behavior. The describing function is one of the few widely applicable methods for designing nonlinear systems, and is very widely used as a standard mathematical tool for analyzing limit cycles in closed-loop controllers, such as industrial process controls, servomechanisms, and electronic oscillators.
Structure skeletons for efficient voice navigation through generic hierarchical objects
InactiveUS7418382B1Quick ViewInterconnection arrangementsInterprogram communicationWeb siteApplication software
Owner:NUANCE COMM INC
Optimizing symbol manipulation language-based executable applications for distributed execution
InactiveUS20120159459A1Software engineeringProgram controlTheoretical computer scienceSemantic equivalence
In one embodiment, a method comprises receiving an application that describes functions according to a prescribed symbol manipulation language, the prescribed symbol manipulation language a non-Turing complete language that does not permit partial functions and describes the functions independent of any attribute of any computing system; identifying, in the application, a distribution annotation that identifies a candidate element in the application, the candidate element configured for execution in a distributed computing operation by a distributed computing system comprising two or more distributed computing devices; generating one or more variants of the application based on executing a nondestructive transformation of the application relative to prescribed equality axioms, at least one of the variants containing a corresponding semantically-equivalent variation of the candidate element; and selecting one of the variants as an optimization for execution of the application by the distributed computing system relative to prescribed metrics.
Owner:CISCO TECH INC
Multifunctional video apparatus and method of providing user interface thereof
ActiveUS20080180549A1Easy to operateImprove visual effectsTelevision system detailsColor television detailsUser interfaceInput/output
A multifunctional video apparatus and a method of providing a user interface (UI) thereof. The multifunctional video apparatus has diverse functions such as image capturing, image reproduction, image editing, image input / output from / to an external device, etc., and provides a UI capable of performing the above-described functions more conveniently.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and apparatus for generating virtual software platform based on component model and validating software platform architecture using the platform
ActiveUS20090210858A1Energy efficient ICTProgram control using stored programsSoftware engineeringDesign information
A method and apparatus for validating a component model-based software platform architecture, the method including: generating a virtual software platform having a template code describing functions of one or more components of software according to design information of a software platform and a build script having configuration variables according to a type of the software and building the generated template code; changing the configuration values of the configuration variables provided in the virtual software platform for a combination of the components; and validating a consistency of the software platform according to a result of executing the virtual software platform based on the changed configuration variables. According to the method and apparatus, by validating in advance whether it is possible to construct a normal composition of the software product, testing and manpower costs can be reduced.
Owner:SAMSUNG ELECTRONICS CO LTD
Karaoke system which has a song studying function
InactiveUS20100203491A1Sufficiently and conveniently practiceIncreasing user 's interestData processing applicationsRecord information storageComputer scienceDescribing function
The present invention relates, in general, to a karaoke system, and, more particularly, to a karaoke system having a song learning function that enables a user to repeatedly listen to songs on a bar or length basis and enables the user to sing songs with accompaniment sounds. The present invention provides a system and method that enables the complete or bar-based singer's song to be repeatedly played back in response to a user's request, thereby enabling the user to sufficiently and conveniently practice one or more bard difficult to sing. The present invention provides a system and method that enables bar-based scores to be indicated, so that the user can be aware of one or more incorrect bars and can intensively practice the corresponding portions using the above-described function, thereby increasing the user's interest and enabling efficient learning.
Owner:YOON JIN HO
Automatic source code annotation generation method based on data mining
InactiveCN106681708ARealize automatic generationImprove readabilityWeb data indexingProgram documentationData sourceFiltering rules
The invention relates to an automatic source code annotation generation method based on data mining. The method includes the steps that texts containing needed annotations are extracted from three kinds of data sources; three filtering rules are formed by combining respective characteristics of the data sources to reject irrelevant noise information, and a text processing technology is used for character format preprocessing; two extraction rules of describing function annotation key characteristics are formed through summarization, and function general annotation is automatically generated according to the two extraction rules combined with the characteristics of the three data sources. The extracted annotation can enrich traditional function annotation, provide multi-dimensional information and support version alternation. Customization is carried out on linux kernel annotation and is easy to implement, and function annotation information which is high in readability and reliable can be provided with small cost; the blank of automatic linux kernel function annotation is effectively filled up, richer reference information is provided for learning and development, and development workload and difficulty are effectively reduced.
Owner:INST OF SOFTWARE - CHINESE ACAD OF SCI
Method and apparatus for generating virtual software platform based on component model and validating software platform architecture using the platform
ActiveUS8601433B2Energy efficient ICTProgram control using stored programsSoftware engineeringDesign information
A method and apparatus for validating a component model-based software platform architecture, the method including: generating a virtual software platform having a template code describing functions of one or more components of software according to design information of a software platform and a build script having configuration variables according to a type of the software and building the generated template code; changing the configuration values of the configuration variables provided in the virtual software platform for a combination of the components; and validating a consistency of the software platform according to a result of executing the virtual software platform based on the changed configuration variables. According to the method and apparatus, by validating in advance whether it is possible to construct a normal composition of the software product, testing and manpower costs can be reduced.
Owner:SAMSUNG ELECTRONICS CO LTD
Method for suppressing limit cycle of inclination angle control system of aircraft with parameter uncertainty
InactiveCN102915036ALimit cycle suppressionEasy to implementAttitude controlAdaptive controlAutomatic controlControl system
The invention discloses a method for suppressing the limit cycle of an inclination angle control system of an aircraft with parameter uncertainty. The method comprises the following main steps of: step 1, analyzing and establishing a model of the inclination angle system of the aircraft; step 2, analyzing scanning functions of a non-linear section and an oscillation phenomenon of the limit cycle; step 3, designing a controller of the inclination angle system of the aircraft with the parameter uncertainty; step 4, inspecting the performance of the controller; and step 5, ending the design. With the adoption of the method, not only is the oscillation of the limit cycle of the aircraft suppressed, but also the parameter uncertainty is overcome, and furthermore, the rapid and precise tracking to the inclination angle of the aircraft is realized. The method has better practical value and good application prospect in the technical field of automatic control.
Owner:BEIHANG UNIV
Script program edition device and realization method thereof
ActiveCN105739983ASimple and easy to expandSimple and easy maintenanceIntelligent editorsSoftware designCode moduleComputer module
The invention discloses a script program edition device. The device comprises a user-oriented edition device and a code provision device, wherein the code provision device comprises code modules; by utilizing a script code of any code module, an application program function can be realized; when a script program of an application program is created, the user-oriented edition device creates a tree structure in response to the operation of a user, and the tree structure is used for describing functions to be realized by the application program and control logic among the functions; in response to the operation of the user, the tree structure sends a call command to the code provision device so as to call the code modules corresponding to nodes in the tree structure; in response to the call command, any code module in the code provision device generates a script code corresponding to the call command and sending the script code to the user-oriented edition device; and the user-oriented edition device creates a script program according to the script code and the tree structure. The invention furthermore discloses a corresponding method, so that the program development efficiency can be improved.
Owner:TENCENT TECH (SHENZHEN) CO LTD
DC-DC convertor stability analysis method based on describing function method
ActiveCN104578776AAccurate Low Frequency Oscillation PhenomenaAccurately judge the phenomenon of low frequency oscillationDc-dc conversionElectric variable regulationNonlinear modellingNon linear model
The invention discloses a PWM type DC-DC convertor stability analysis method based on a describing function method. The stability analysis method includes the following steps that a PWM type DC-DC convertor is linearly modeled to obtain a linear model, a first transfer function and a second transfer function; the describing function method is adopted to carry out non-linear modeling on a non-linear link in the PWM type DC-DC convertor to obtain a first describing function; the second transfer function is replaced by the first describing function to obtain a non-linear model; according to the first transfer function, the first describing function and the non-linear model, the stability of the PWM type DC-DC convertor is analyzed. The PWM type DC-DC convertor stability analysis method can accurately analyze the critical stable state of the PWM type DC-DC convertor, an obtained result is more accurate than that obtained by a traditional linear analysis method, thus the low frequency oscillation phenomenon occurring in the PWM type DC-DC convertor can be analyzed, and the analysis accuracy is high.
Owner:BEIJING JIAOTONG UNIV
Optimizing symbol manipulation language-based executable applications for distributed execution
InactiveUS8762964B2Digital data processing detailsSoftware engineeringTheoretical computer scienceComputing systems
Owner:CISCO TECH INC
PaaS hybrid cloud construction method based on model
The invention relates to a PaaS hybrid cloud construction method based on models. Specifically, the method comprises a step S1 of constructing a uniform model, describing resources, service types and management functions shared by PaaS platforms in cloud platforms, and managing the heterogeneous cloud platforms through a uniform view; a step S2 of constructing a cloud resource model, shielding heterogeneity of cloud platform management interfaces, describing function information of cloud platform managed modules and calling methods of the cloud platform management interfaces, and managing the cloud platforms in a model layer; and a step S3 of constructing model synchronization middleware, defining element mapping relationships from the uniform model to the cloud resource mode, automatically generating corresponding model conversion programs, and realizing a synchronization relationship between the models. According to the method, a management program can be established on the basis of the PaaS platform uniform model, and therefore, the difficulty and complexity of developing a PaaS hybrid cloud management system can be reduced to a great extent.
Owner:FUZHOU UNIV
Object Location and Tracking
ActiveUS20140218238A1Lower energy requirementsSmall batteryBeacon systems using radio wavesLocation information based serviceComputer scienceDescribing function
A method for tracking an object includes associating a beacon with a responder; transmitting a polling signal from the beacon to the responder; receiving a response from the responder; entering a low power state on the beacon for a predetermined duration; and transmitting an alert from the beacon responsive to a subsequent signal from the beacon failing to result in receiving a subsequent response from the responder. Embodiments also include a system in which the beacon and responder are configured to perform the described functions. In various embodiments, the duration during which the beacon remains in the low power state is predetermined based either on a default factory setting or a user adjustable setting.
Owner:MAXWELL FOREST
Job processing method and image processing system
InactiveUS20080134186A1Digital data processing detailsUnauthorized memory use protectionTemporal informationImaging processing
An ACT generation unit (208) in an access control apparatus generates an ACT in a form in which the ACT includes function restriction information based on the time period. At this time, in response to an ACT request from a client PC, a list (401) which describes function restriction information based on the time period is referred to based on user information (404) and time information (405) representing the request time. A regular time ACT (410) and overtime ACT (411) are generated in accordance with the request time. By replying the ACT to the client PC, a print job is transferred together with the ACT to a printing apparatus, allowing access control based on the time period.
Owner:CANON KK
Transonic limit cycle flutter analysis method
InactiveCN103310060AModerate amount of calculationEasy to masterSustainable transportationSpecial data processing applicationsEquivalent linearizationAnalysis method
The invention provides a transonic limit cycle flutter analysis method. The transonic limit cycle flutter analysis method comprises the following steps: through equivalent linearization of a describing function, processing nonlinear characteristics of a transonic aerodynamic force; substituting a frequency-domain aerodynamic coefficient after the equivalent linearization into a flutter equation; obtaining a flutter speed and a flutter frequency by a frequency-domain flutter solving method; and for different limit cycle amplitudes, calculating to obtain different flutter speeds and flutter frequencies to form limit cycle characteristics of a transonic nonlinear flutter. The equivalent linearization is performed on the nonlinear characteristics of the transonic aerodynamic force through the aerodynamic describing function, the flutter equation is solved within a frequency domain, so that the flutter speed and the flutter frequency at a given limit cycle amplitude can be accurately predicted; and the transonic limit cycle flutter analysis method is moderate in computation amount, easy to master and very good in robustness.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Similarity based semantic Web service clustering labeling method
ActiveCN105404619AImprove accuracyImprove performanceSpecial data processing applicationsSemantic web servicesLabelling algorithm
The invention discloses a similarity based semantic Web service clustering labeling method. The method is characterized by comprising two parts of realizing semantic Web service similarity calculation and realizing a semantic Web service clustering labeling algorithm. During the semantic Web service similarity calculation, in combination with results of input / output (I / O) parameter mixed similarity calculation and service description keyword similarity calculation, a calculation result of semantic Web service similarity is comprehensively obtained, and the difference and similarity between service functions are reflected; and I / O parameters can directly describe functions of corresponding service modules and serve as measurement standards for calculating the semantic Web service similarity from a functional perspective. According to the method, the accuracy of similarity calculation can be improved and the performance of a service discovery system is further improved.
Owner:SOUTH CHINA UNIV OF TECH
Cascade DC-DC converter stability analysis method based on describing function method
ActiveCN108521219AAccurately judge the critical stable stateImprove accuracyDc-dc conversionElectric variable regulationStable stateDc dc converter
The invention discloses a cascade DC-DC converter stability analysis method based on a describing function method. The cascade DC-DC converter stability analysis method includes the following steps: performing linear modeling on a linear part in a single-stage DC-DC converter in a cascade system through a small signal modeling method to obtain a first linear transfer function; performing nonlinear modeling on a switch link of the DC-DC converter through a describing function method to obtain a describing function; performing equivalent processing on a source converter through a converter equivalent method to obtain a second linear transfer function, and determining the stability range of a two-stage cascade DC-DC converter according to a relation between the second linear transfer function and the describing function; and performing equivalent processing on a load converter through the converter equivalent method to obtain a third linear transfer function, and determining the stability range of the two-stage cascade DC-DC converter according to a relation between the third linear transfer function and the describing function. The method of the invention can accurately determine the critical stable state of a converter system and effectively improve the accuracy of judgment results.
Owner:BEIJING JIAOTONG UNIV
Pocket design for garments to allow mobile device users hands free recording of video, audio and other data
InactiveUS20170280797A1Improve performancePrecise positioningTrousersOvergarmentsHands freeVideo recording
This invention is a pocket that is incorporated into a garment to hold a mobile device safely and securely on the wearer with its sensors exposed such that the mobile device functionality relative to data collection or utilization (audio, video, photographic and other data) is possible in a hands free nature. This will allow a user, without the need for special cases or harnesses, to do hands free POV (Point of View) video recording, photographs, audio recording, and other application driven data collection such as GPS trip mapping, environmental data collection, and two way voice activated communication. The intention is to have the pocket to be a part of many types of clothing consumers wear, so the mobile device is easily put to use for the described functions, is readily available when needed and is a convenient and inexpensive alternative to special harnesses, holders or carriers. The invention also carries out the functions of a standard mobile device holster or harness such that the user can access the device for playing music or other functions in a hands free manner.
Owner:BAYLISS TERRENCE ROY
Function analysis method for mature product
The invention relates to a function analysis method for a mature product, and belongs to the technical fields of mechanical design and automation. The method comprises the following steps of: first defining a function level matrix and a function relationship matrix to describe functions, and simultaneously constructing a function element list; then analyzing function elements of a product of a certain kind on the basis of the function element list, and representing a relationship between every two function elements by using the function level matrix and the function relationship matrix; and finally processing the function relationship matrix by adopting an alpha-intercept matrix method for fuzzy design to obtain a function tree of the product to realize function analysis on the product from bottom to top. By the method, the problem of over-coarse or over-fine granularity is solved; and in addition, computer programming is facilitated by representing the functions and the relationship between every two functions with the function level matrix and the function relationship matrix.
Owner:HOHAI UNIV CHANGZHOU
Aircraft nonlinear attitude control system stability analysis method
ActiveCN106383523ADead zone threshold h setting method satisfying closed-loop stabilityAttitude controlControl systemClosed loop
The invention discloses an aircraft nonlinear attitude control system stability analysis method, and belongs to the field of aircraft attitude control. According to the method, firstly the power coefficient corresponding to the aircraft flight state is calculated, and a corresponding item is expressed by a dead zone threshold h; and then an aircraft linear part transfer function Nyquist curve and a nonlinear part negative converse descriptive function curve are drawn, if the two curves have no intersection point, the nonlinear system is judged to be stable, the value of the pitch channel dead zone threshold h is designed, or the nonlinear system is judged to be instable. According to the method, the stability judgment method for the closed-loop system under different threshold conditions is given so that the stability judgment basis for the closed loop corresponding to the dead zone threshold is theoretically put forward.
Owner:THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
Diatom characteristic description and classification method based on contour drawing
InactiveCN101555515ALow costMicrobiological testing/measurementMicroorganism based processesMicroscopic imageContour segmentation
The invention discloses a diatom characteristic description and classification method based on a contour drawing, which relates to a characteristic representation method of a diatom microscopic image. The invention provides a diatom characteristic description and classification method based on a contour drawing, which automatically describes the contour of a diatom microscopic image, can be applied directly to a diatom recognition system and can provide a high-efficient diatom automatic recognition method for scientific research and cultivation. The method comprises the following steps: a diatom body contour drawing is obtained by the pretreatment and contour segmentation of the diatom microscopic image; the contour characteristics are analyzed and obtained: a contour describing function is obtained by showing the contour with a function to the target area, of which an angle is an independent variable and a value is the radius length from the center of gravity to the contour; standardization is realized by the radius value of the contour describing function divided by the max radius value; a characteristic matrix is formed by extracting the drawing characteristics of the drawing; and a classifier is adopted to classify the characteristic matrix and then classification result is obtained and output.
Owner:XIAMEN UNIV
Data Processing System With A Plurality Of Subsystems And Method Thereof
InactiveUS20080052708A1Safe isolationWide range of applicationsMultiprogramming arrangementsSoftware simulation/interpretation/emulationData processing systemComputer science
A method of virtual dividing of data processing system and a data processing system, for providing a plurality of physical or virtual sub data processing systems under the same data processing system interface, wherein each of sub data processing systems can achieve different applications; the security of different sub data processing systems are isolated each other, so that meet to different security requirements of applications for different requests; like TV channel, each of subsystems can be online switched; meanwhile, the invention provides the mainboards that can accomplish above-described functions, the switching devices, and the switching methods.
Owner:ZHONG JUHANG
System and method for describing function model by applying specific gene coding
InactiveCN101334800ABiological modelsSpecial data processing applicationsIntelligent designTransformation algorithm
The invention relates to a system and method adopting characteristic gene codes to describe a product function model. A product characteristic expression model is obtained by profound research to the product characteristic gene paradigm expression, characteristic integration requirement and characteristic coordinate transformation algorithm; a product function model is obtained by the research and analysis to the product function definition, function expression and function model establishment. The product function is further decomposed and mapped into characteristics on the basis of the product characteristic expression model and function model so as to finally describe the product function by the product characteristic gene codes and lay a foundation for the product intelligent design.
Owner:TONGJI UNIV
An external service application discovery method
The invention relates to an external service application discovery method. An external service application discovery process connects a host with an external application server operating service application which allows users of client computing equipment to work together with files through web browsers. The host violates the function of the external application server and serves as a platform where interaction between the client computing equipment and the external application server is generated. A development interface protocol (shared communication protocol) allows the host to send an instruction to the external application server from the client computing equipment. Through the external service application discovery process, the external application server describes functions provided for the host by the service application. The host selectively enables the functions provided by the service application to be available for the users based on the implement level of the development platform interface and agreements of the external service application discovery process understood thereby.
Owner:MICROSOFT TECH LICENSING LLC
Magnetic suspension flywheel buffeting weakening method based on sliding mode variable structure control
InactiveCN108681255AAvoid shockReduce buffetingAdaptive controlResearch ObjectVariable structure control systems
The invention discloses a magnetic suspension flywheel buffeting weakening method based on sliding mode variable structure control; the method uses a generalized description function method of a sliding mode variable structure control system and an adaptive unscented Kalman filtering algorithm to weaken signal buffeting, takes buffeting imported by the variable structure control and the system stability design as research objects, starts from variable structure control buffeting inhibition and present conditions and existing problems of a DF method applied in a non-linear system, emphasizes onstability analysis of a frequency correlation description function N (A, [omega]) and a variable structure switching gain adaptive adjusting method, proposes the adaptive unscented Kalman filtering (AUKF) algorithm, and designs a H[delta] sliding mode controller based on gain scheduling, thus verifying the validity of the proposed buffeting adjusting and inhibition method. The method ensures thesliding mode variable structure control method not to be sensitive to extraneous disturbances, can ensure an excellent robustness, and can effectively weaken system buffeting caused by continuously switching of the flywheel structure.
Owner:JIANGSU UNIV
Photovoltaic power generation system stability analysis method considering power control influence based on description function method
ActiveCN108565896AEasy to analyzeSingle network parallel feeding arrangementsPhotovoltaic energy generationPower controllerSystem stability
The invention relates to a photovoltaic power generation system stability analysis method considering power control influence based on description function method. The photovoltaic power generation system uses disturbance observation method to achieve maximum power control. For the non-linear, discontinuous characteristics, the method utilizes a description function to establish a power control model based on the disturbance observation method. The method combines with a small signal modeling of photovoltaic power generation system, and forms a complete system model considering power control influence. Then the description function method is adopted to analyze the stability of the photovoltaic power generation system. This method solves the problem that small signal stability analysis cannot be applied to discontinuous and nonlinear links. The relevant parameters of the disturbance observation method in the system stability analysis are introduced to make the analysis more comprehensive and accurate. At the same time, the method provides the basis for power controller parameter setting.
Primary frequency modulation feedback channel nonlinear link parameter configuration method and system
ActiveCN110492483APower oscillations reduction/preventionControllers with particular characteristicsSystem stabilityFrequency modulation
The invention discloses a primary frequency modulation feedback channel nonlinear link parameter configuration method and system, and aims at a primary frequency modulation model containing a dead zone-PID controller-amplitude limiting link; the configuration method comprises the following steps: representing a nonlinear link through a description function; determining a nonlinear link gain; and according to the improved Nyquist criterion, determining the stability range of specific parameters of a single nonlinear link and the dead zone-PID controller-amplitude limiting link. According to theinvention, a reference scheme is provided for primary frequency modulation dead zone amplitude limiting link parameter setting in practical application; meanwhile, according to the improved Nyquist criterion, a curve is used for replacing an original single feature point, and compared with a traditional Nyquist criterion, the influence of the internal structure of the nonlinear link on system stability can be better reflected.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
Fuzzy adaptive compensation control method in performer time lag and failure
ActiveCN107390527AControl tracking errorGuaranteed transient tracking performance stabilityAdaptive controlTransient stateIndustrial systems
The invention discloses a fuzzy adaptive compensation control method in performer time lag and failure; the method comprises the following steps: building an industrial system model with a performer failure, wherein the industrial system model comprises time lag performer failure fault description functions; building a virtual controller and virtual controller satisfying adaptive rules according to preset transient performance parameters, thus controlling the industrial system model tracking errors when the time lag performer failure faults happen. The method can ensure the system transient tracking performance stability when the performer simultaneously has time lag and failure.
Owner:GUANGZHOU UNIVERSITY
Intelligent display terminal system
InactiveCN103135968AEasy to operateEasy to program verbositySpecific program execution arrangementsDesign softwareTerminal system
The invention provides an intelligent display terminal system which comprises a display liquid crystal screen, a central processing unit (CPU), image designing software, a driving program unit, a data processing unit, a describing function base, an image character base, a self-defining function base and a code generating module. Various images, editing content and the like which are needed are designed, called and combined through the image interface design software. A proper menu format is selectively edited through the self-defining function base and the describing function base. Menu options are oriented. Necessary data linkage processing is carried out through the data processing unit. The system supports a modbus agreement or a self-defined protocol, after an interface is arranged through the image designing software, corresponding C language codes can be generated through the code generating module, and the codes are placed into a source program host process. Complex degree of programming of designing personnel is lowered, project developing time is greatly shortened, debugging and maintaining of the designing personnel are convenient, portability is high, and most interface designing requirements can be met.
Owner:SHANGHAI HUAJIAN ELECTRICAL EQUIP
Unmodeled dynamics induced harmonic analysis method for Buck converter sliding mode control system
The invention belongs to the technical field of Buck converter sliding mode control systems, and particularly relates to an unmodeled dynamics induced harmonic analysis method for a Buck converter sliding mode control system. The method specifically comprises the following steps: (1) modeling of an unmodeled dynamics Buck converter sliding mode control system for a sensor; (2) Buck converter sliding mode control; and (3) analysis of the amplitude-frequency characteristic of output voltage harmonics of a Buck converter based on a describing function method. A novel output voltage harmonic amplitude-frequency characteristic quantitative analysis method based on the describing function method is provided for the Buck converter sliding mode control system, and a novel harmonic induction mechanism under the co-existence of switching nonlinearity of a sliding mode controller and unmodeled dynamics of the sensor is provided.
Owner:HARBIN ENG UNIV
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