CN104700686A - Real-object simulated maintenance training system for domestic electronic products - Google Patents

Abstract

The invention discloses a real-object simulated maintenance training system for domestic electronic products, and provides a real-object simulated practical training system in order to solve the technical problems of high cost, high loss and insufficient fault simulation environment types in real-object operation practical training. According to the system, faults of some elements of a real-object circuit board are simulated manually by connecting the elements to a control panel and a computer to perform practical training; the simulated faults do not mean mounting of faulted elements on a real object, but mean that one element is switched off or in short circuit through a switch to simulate an open circuit or breakdown, so that damage to a printed circuit board due to repeated demounting and mounting of the elements is avoided. The system comprises student computers, teacher computers, a system management computer, a simulation system server and a database, and has functions of user authentication implementation, real simulation, fault design, digital recording and playback, network interaction, operation evaluation and analysis, teacher demonstration, monitoring and guidance, management and maintenance, virtual classroom, automatic upgrading and the like.

Description

A kind of matter emulation maintenance of nuclear for domestic electronic appliances

Technical field

The present invention relates to the training system in operation real training field, be particularly useful for the fields such as domestic electronic appliances maintenance training.

Background technology

The conventional object operation real training mode in training field repaired by current electrical equipment, some faults are manufactured exactly on material object, the knowledge allowing student pass through to have acquired manages to fix a breakdown, and being provides actual exerciser meeting of starting with real product for student, is traditional practical training method.The advantage of this method is the most directly perceived, and student is when operating and really keep in repair the same, the manipulative ability of applicable cultivation student, but it has some unavoidable defects: be first in this way set by fault limitation larger.For colour TV, consider real training Cost Problems, the fault of unlikely setting such as power supply pipe, line pipe, line output transformer, integrated circuit, the first-class component wear of high frequency, and exactly the fault of these elements, in reality maintenance, accounts for 80% of maintenance total amount.The fault of some little element opens or short circuit can only be set, but the component wear simultaneously can't cause the damage of other element, this kind of fault accounts at most 20% of maintenance total amount in reality maintenance, that is real training with actual keep in repair disconnect more serious.Second defect of object operation is, because set fault will give many students practice repeatedly, this just causes the same place at printed panel, element is by repeated disassembled and assembled, the printed panel of this point is easy to damage, even some student looks into out of order, but looks for the element on the printed panel of " rotten " specially, wheel and deal.

Summary of the invention

The present invention is in order to solve the very few technical matters of the loss of high cost height and fault simulation environment kind in object operation real training, provide a kind of matter emulation experience system, described system is by some element on wiring board in kind, by being connected to control panel and computer mode, people simulates the mode that phenomenon of the failure carries out real training.The fault that it is simulated is not fill bad element on material object, but by switch, is disconnected in circuit or short circuit by certain element, to simulate the open circuit of this element or to puncture, thus avoids the printed panel damage caused due to the repeated disassembled and assembled of element.

Described system has the feature of the following aspects:

1, system facilitate easy-to-use

The use of whole system should be very be simple and easy to use.Consider that the computer level of student is uneven, therefore system needs to provide clear system interface, with reality close to easy to understand, even if be subject to the student of little computer skill real training also can understand function and the operation of system very easily, the use of system can be grasped in a short period of time.Also want in addition to provide various explanation and help as much as possible in system, in time the operation of student and problem are known.Enable this system of use of student's most convenient.

2, the versatility of system and expandability

System needs to provide to emulate the different brands of multiclass product, and therefore, system needs versatility and the expandability of considering whole system copying when design, conveniently can provide and carry out analog simulation to the different brands of various different product.Meanwhile, the defect content for each product needs to be programmable, is convenient to expand.

3, quick and high reliability

System can make reflection to the use operation of student in time in time, and the operation that real-time display student carries out is on the impact of maintenance result.Especially teacher can monitor the operation of student in time, does not significantly postpone.The reliability of system is also weigh a key index of system performance, therefore requires that system has higher handling capacity, reasonable fault-tolerance and low error rate.

4, real-time and authenticity

In order to the process allowing student can understand maintenance really, system requirements has better real-time and authenticity, mainly comprises:

The real-time change of each parts can be reflected

Can measure in real time each parts

Realistic simulation is carried out in the parameter transformation that can cause parts

5, the unified management of resource

System management is to run the operation of this system, monitor, manage, analyze, control, assess and expansion provides effective means.Thus with rational cost, organize and utilize system resource, giving full play to systemic-function, normal, safe, reliable and effective, abundant, user-friendly service and use are provided.

6, teacher computer is to the monitoring and controlling of student

Teacher computer can ongoing operation can carry out recording a video and preserving on each student's machine of real time monitoring, the test time of student can be set when taking an examination, and can be switched to demo mode time at school, now student can only view and emulate the demonstration of teacher.

7, system manager is to the management and supervision of analogue system

System manager has highest weight limit in analogue system, and can manage and monitor whole system whether normal operation, that such as can check every class carries out situation, and quality of attending class, keeps order etc., and processes some accidents.

Accompanying drawing explanation

Fig. 1 is emulate system architecture figure of the present invention;

Fig. 2 is the database schematic diagram of analogue system of the present invention;

Fig. 3 is the functional module structure figure of analogue system of the present invention;

Fig. 4 is the basic flow sheet of the authentication of analogue system of the present invention;

Fig. 5 is the simulation part separation structure figure of the simulation engine of analogue system of the present invention;

Fig. 6 is the finite state transmission diagram of the simulated fault script of analogue system of the present invention.

Embodiment

Below in conjunction with accompanying drawing, describe experience system of the present invention in detail:

1, system framework

As shown in Figure 1, this analogue system adopts Client/Server/Database (hereinafter abbreviated as C/S/D) three-layer architecture.

2, analogue system client (Client)

According to different rights and the using function of client, client is divided into three types by us: keeper's machine, teacher computer and student's machine, the network communication mode of client and server has two kinds: if long-range real training point ground network condition is very good, then communicates and undertaken by ground network completely; If long-range real training point ground network communication quality is not very good (being dialled up on the telephone by modem, ISDN etc.), can be combined by satellite communication link and ground Internet and carry out, " world unification ", realizes long-range real training and the qualification (as shown above) of operative skill.

Student's machine is exactly the computing machine that student uses at our system middle finger, and student uses the student of analogue system to hold software in client, similar, and teacher computer, keeper's machine use the teacher side software of analogue system and keeper to hold software.Because at present personal computer function strengthens day by day, in order to make full use of client machine performance, alleviate the burden of service end, we adopt Fat Client simultaneously, and namely main simulation calculation concentrates on client and runs; Certainly, need between client and server to communicate, the data of switching part.

The major function of student's machine signs in server exactly, adds " Virtual Class ", and can Dynamic simulation software client, realize with server, teacher side mutual etc.

Teacher computer is except having all functions of student's machine, read access can also be carried out to Database Systems by analogue system server, and the various operations of student's machine can be monitored by emulation server, the operation of student's machine is evaluated, can also keep order in one's classroom in " Virtual Class " of server and student's machine be managed.

Keeper's machine both can be used as student's machine, also can be used as teacher computer, and it also had some function, specially for what manage, provided keeper as monitoring analogue system, provided data management, user management etc. ability.

3, analogue system server (Server)

At native system, analogue system server has run a series of server program, by various client contacts together, realize teacher and the two-way real-time, interactive of student, authentication service (authentication to each client and service end user is provided), student monitors, operation demonstration, the various function such as " Virtual Class ", operation evaluation, and carry out alternately with database server.

In a word, as the service end of the core of analogue system, have many powerful functions, control is had to each client.

The communication that client and server is main:

(1) user logs in---and client's operational network analogue system needs first to carry out client's login, and this is security needs mainly, the authentication service of client-requested server, judges the legitimacy of user;

(2) emulation command---transmit the various emulation commands of real-time, interactive;

(3) Virtual Class---emulation server will set up a Virtual Class, and all clients can join the Virtual Class of server, carry out in real time exchanging etc.;

(4) feedback is evaluated---student operates, and analogue system suitably will be evaluated operation, and evaluation information is fed back to each student end;

4, database (Database)

There are various data in analogue system, organization of unity is also deposited in a database, i.e. convenient but also safety.Have any it should be noted that, our database is classification, sees Fig. 2.

Be described as follows:

(1) server database (or being called " master data base ")

As its name suggests, database is positioned at server end, for server access, the total data of whole analogue system all leaves in master data base; Server database only provides data to server, and the important data client of part only could access master data base through server, and such as, user ID data is only present in master data base, and client is carried out authentication and come by server;

The isolation of data can ensure the security of data.

Master data base generally needs the database adopting some better performances, otherwise may cause data access bottleneck, and data security is inadequate, management neither be very convenient, and performance is inadequate especially, and what we selected is oracle database.

(2) client database (or being called " auxiliary database ")

As its name suggests, database is positioned at client, for client-access, be the partial image of master data base, such as, data of emulation part etc.; Meanwhile, some local settings of client are also left in client database.

Client database can adopt this more low-level database of similar Access.

Adopt the pattern of this hierarchical data base to be the form that Fat Client pattern generally all adopts, a large amount of data are deposited in this locality, once copy, and repeatedly use, and by the exchange capacity of minority certificate, improve overall performance.Adopt this kind of mode, can auto-update, adopt independently ROMPaq to carry out Data Update, upgrade client client database, keep and the consistance of service end emulated data.

5, systemic-function of the present invention

Fig. 3 is the detailed functional module structure figure of the present invention, and described analogue system function comprises:

(1) user authentication

User authentication comprises system and logs in and control of authority two aspects, and any one system all needs security control, therefore, before any operating personnel enter system, needs to log in.Preset three kinds and log in identity: student, teacher, keeper.

Only have legal student just can the system of entering carry out simulation training, and can to conduct interviews restriction to emulation content and operation.After the simulation software of teacher's login service end, the operation of the various domestic electronic appliances maintenance operation demonstration of primary responsibility, observation student, and make suitable guidance etc.Keeper logs in rear responsible system management and daily servicing.

(2) real simulation

The phenomenon of the failure of software electrical product and failure condition carry out real simulation.

Simulative display is carried out to the phenomenon that the fault of circuit occurs.Carry out text description, true reappearance fault state simultaneously.

Virtual maintenance tool and instrument are provided, as oscillograph, multimeter, etc. instrument, can the situation of circuit in metering circuit and device.And panel board and the reading of these instruments can be shown again in software.

There is provided various virtual electronic components and parts, user again electronic devices and components can be chosen in interface and change, and can measure the performance of these devices.

(3) accident design

In order to adapt to the change of keeping in repair content, system provides the function of accident design.Accident design function module design fault script can be passed through, at the displaying contents etc. of the phenomenon of script inediting fault, maintenance step, route survey, supvr can be specified from fault original state by design state transition graph, the state transition process that each maintenance operation of user brings, and the phenomenon of the change of fault and simulative display new state.

(4) digital recording, playback

Each step of the simulation operations process of teacher or student is recordable, and digital recording is exactly preserve each step whole process of simulation operations, not only preserves operation, and the relative time that operation occurs also needs to preserve.According to the simulation operations script preserved, can playback be carried out, automatically repeat the simulation operations overall process recorded, and time consistency.Digital recording, playback can save the running time of teacher, and operation script is preserved in single job, demonstration of later repeatedly resetting.The operation of student also can preserve the foundation passed judgment on as teacher.

(5) network interaction

Maintenance training process is a mutual process, and teacher can allow certain student answer a question by puing question on the one hand, and each student also can be made a speech by the form of raising one's hand to put question in addition, and other students can see the solution process of problem and problem.System provides the reciprocal process that a series of instrument is supported in teaching process in teacher and student.

(6) operation evaluation analysis

Operation evaluation refers to that software itself is evaluated for the simulation operations of student, carry out suitable statistics according to the time consumption of correctness, the again binding operation of student's operation to convert, the just evaluation providing student's functipnal capability can be accomplished, and can propose to analyze suggestion for the subject matter of operation.

(7) teacher's demonstration

The demonstration of video is an important content of teaching, and teacher the content of courses of certain or some maintenance processs being recorded into video, can be demonstrated to all students by the form of Web broadcast.Here comprise two parts, one is that teacher can select the class period to force to allow all students watch the process of demonstration simultaneously, and student also can, at the demo content of attending class of program request free time teacher, carry out reviewing and consolidating on the other hand.

(8) guidance is monitored

Time at school, teacher computer can check the operation of all students.What operation information was real-time is sent to teacher computer by network, make teacher computer can real time monitoring to the operating conditions of any one student.While supervision, can correct by the operation of instrument to student of network interaction and instruct, there is better teaching efficiency.

(9) management maintenance

Software provides powerful administration module, carries out management maintenance to system, mainly comprises following contents:

The management of user: the personal information of management user, logon information and control authority etc.

The management of fault: the design comprising fault, amendment, safeguards etc.

Electronic product manage: provide interface can input the electronic-circuit diagram of new product, and graph of a correspondence display etc. information, can add, amendment deletions grade editing operation.

Other management: by the management optimization system performance to system, carry out upgrading and safeguarding etc.

(10) Virtual Class

In order to solve communication disorder, need to provide an environment exchanged, Virtual Class is very good selection.The somewhat similar chatroom of Virtual Class, forum and so on, but, Virtual Class with better function.Teacher needs to control the order in classroom, and such as, under order state, student cannot arbitrarily make a speech, and needs " raising one's hand ", just can obtain the floor, make a speech; In a free state, can make a speech arbitrarily, discuss.

The teacher being positioned at service end has the highest control in classroom, has the right to arrange the state of Virtual Class, has the right to forbid the right to speak of certain student, and leave Virtual Class etc. to the troublesome student expulsion student that has the right, in a word, all are in order to situation in render real classroom.

(11) auto-update

Our analogue system possesses versatility and expandability, new copying all may be had every day to add in database, auto-update function can upgrade the data of client easily and expand, all the time ensure that the emulated data of client is consistent with the emulated data of service end, this is the important guarantee to carrying out normal two-way interactive between teacher, student; Otherwise data inconsistent being certain to causes makeing mistakes alternately.

6, system

According to listed hereinbefore go out analogue system function list, we whole analogue system is divided into following six major part, the detailed design of each several part is as follows:

(1) management software

Management software, completely for system manager designs, provides every management function.Meanwhile, also can manage for emulation content etc.Comprise following functions module:

A user authentication

Keeper's login management software needs to carry out certification, and due to the function of this Software for Design height secret, therefore, certification is very strict.General management person logs in 3 chances, if 3 login failures, system automatically locks half an hour.

B user management

User management, mainly for all users of system, here can once operate:

Adding users

Amendment user right, password etc.

Delete user

C simulation management

Simulation management is mainly for the management of emulation related content, and can carry out operation and maintenance for the emulated data in database, major function has:

Delete emulated data that is out-of-date, that cancelled (such as: the simulation operations evaluation of upper first phase student, no longer teaching simulated fault etc.);

Backup significant data (preventing all from may destroy the situation of data);

Recovered part data (use backup above, recover data);

Increase partial simulation related data (such as, new product, new electronic-circuit diagram etc.)

D log management

Analogue system, accident design software and automatic updating system etc. are all the functions having daily record record, and all daily records all unification concentrate in the log sheet of database.Log management provides keeper to watch system routine work situation, simultaneously documented when there is serious accident involving serious consequences, easily finds accident cause.

Log management provides log query, derivation and deletion etc. operation.

(2) accident design software

Simulated fault design software carries out the special edit tool of simulated fault script (below simulation engine part we also will introduce some contents of relevant simulated fault script).Accident design software is the establishment difficulty in order to reduce simulated fault script, provides some patterned supplementary meanss, reduces the error rate of writing fault script, accelerates script compilation speed.

Accident design software can be divided into following main modular:

A user authentication

Because accident design software runs in service end completely, therefore, the user authentication of here only needs directly and serves client database to compare.Verification process adopts md5 encryption equally, by the password of user through md5 encryption, then compares with the password in database.

Because accident design comparison is important here, therefore, only have teacher, keeper can use.

B interface module

The fundamental purpose of accident design software is for design error failure script provides auxiliary, and the friendliness at interface and ease for operation are also very important.Here interface module be designed with the main points of following several respects:

Standard, general

Each dvielement of usual needs all can provide one by one, and menu, toolbar, status bar etc. all meet working standard, and interface has popular affinity.

Omnibearing prompt operation is provided, supports self-defined

Good, a high efficiency software needs to support prompt operation comprehensively, and toolbar, shortcut etc. are all the good methods of increasing work efficiency.We not only provide omnibearing prompt operation, and support self-defining prompt operation, allow user to define new toolbar, allow editor's shortcut.

Comprehensive support dock

Because accident design software has many interface elements, numerous subwindows and tool bar will be there is, therefore, support dock comprehensively, facilitate user according to the custom of oneself to arrange interface, real human oriented design, improve the work efficiency of user.

C circuit diagram editor module

The basis of our whole simulation operations is exactly the electronic-circuit diagram of all kinds of audio and video equipment, therefore, in the process of accident design, be need to carry out editing to circuit diagram sometimes, may need, by part of devices objectification in original circuit diagram, to carry out the setting of objectification.These objects are need to use in simulation process subsequently.

Therefore, circuit diagram editor module needs to support the dwg file layout of AutoCAD, meanwhile, except general flexible, location, mobile except, needs can carry out selecting, shear, objectification, and can carry out some definition and arrange work.

D circuit board editor module

Circuit board editor needs circuit board figure to edit in analogue system in circuit board display.Circuit board editor module to circuit board figure defining objects, and can arrange measurement point or region.We know, in some cases, for the accident design that identical product is different, the major part on possible circuit board is consistent to liking, and therefore, circuit board figure is public, and object is also divided into publicly-owned and privately owned, reduces repeated workload like this, raises the efficiency.

E constitutional diagram editor module

We know that the core of whole fault script is state transition graph, and patterned constitutional diagram editor can accelerate script formation speed, reduces the mistake that pure copy editor causes.

Constitutional diagram editor major function has:

● state definition and editor

Can state definition be necessary function.Original state and final state are generally that system is predetermined, can not define, and can only edit for the attribute of state, action etc.;

● stateful connection defines

Connect between enable state, and allow to define the connection between state and edit, general connection all operates and causes, therefore, connection between state is all operation (have definition when these operate in database, having special Operation Definition instrument in aid).

● the bi-directional conversion between figure to script

Constitutional diagram finally will save as script, and constitutional diagram and script also exist the relation of bi-directional conversion, if find that script cannot be converted to constitutional diagram, then proves that script may damage.

F script-editor

Except constitutional diagram edit tool, we also provide script-editor, then mainly provide to those very skilled operating personnel, need completely manually to write.

Script-editor supports syntax parsing, can identify, for compile script is provided convenience the various different part different colours of script and font.

G aid

Only rely on above instrument to be inadequate, complete script also needs many aids, and these aids are carrying out providing many facilities in the process of editing.Aid mainly contains:

● Operation Definition

We are for the definition operated mainly based on certain operations template definition, and such as, measuring is exactly a kind of operation template; If we define certain and are operating as measurement operation, so inevitable clear according to measurement module definition, probably mainly comprise (measurement instrument, measuring object), measurement instrument is virtual instrument mainly, and measuring object is exactly the object defined in circuit diagram editing machine;

● multimedia list

Multimedia names list in database, mainly comprises video, audio frequency etc.; In lists, we can carry out adding, revise, to delete etc. operation, allow multimedia to import.

This list mainly helps definition playback action to be auxiliary use;

● list of parts

Comprising instrument, virtual screen, electron device object etc. is all completely set forth in list of parts, is provided in various occasion and promptly applies them.

H log recording

Accident design software is may many emulated datas in Update Table storehouse, and security audit is extremely important; Action need for some material alteration data carries out log recording, so that documented from now on.

I helps and operation demonstration

Accident design software is very complicated, provides various functions and prompt operation, conveniently uses and increase work efficiency, and software specialized designs help system, provides comprehensive help on-line; Meanwhile, provide a set of operation to demonstrate, can view and emulate for study.

(3) automatic updating system

A auto-update client

The maximum feature of analogue system is versatility and expandability, and therefore, the renewal of emulated data is inevitable.Description above about database has clearly illustrated that emulates client needs often upgrading.

Auto-update client provides this function, and auto-update client can be run automatically, also can manually run, and completely automatically carries out upgrading inspection, once find that service end has new data, upgrades immediately.

B auto-update service end

When server end more new data or emulates client software upgrading, the version number of system is improved in capital, auto-update service end will judge analogue system version and the service end current system version of client to find, provide upgrading update service immediately to auto-update client inconsistent.

(4) analogue system client

As previously described, client is divided into three types: Xue Yuanduan, teacher side and keeper's end, teacher computer is more than student owner student monitoring and operation evaluation analysis two large functions, and keeper's system management functions more than teacher.

A hardware controls part

Hardware controls part provides software to arrive the intermediary of real video product maintenance training qualification hardware system or audio product maintenance training qualification hardware system.Software control video, audio product phenomenon of the failure are realized by hardware controls part.

The part of the fault simulation of audio and video equipment is combined with hardware material object, by analysis, is not difficult to find out the control that most control is mainly carried out out and closed; The more senior control of part carries out adjustable control for resistance, inductance, electric capacity etc.; Therefore, whole hardware components needs to provide switch control rule and part of devices to regulate, and meanwhile, hardware controls part needs to provide communication interface to main frame, facilitates main frame to control.

Hardware controls part mainly contains RS232 serial communication interface, process chip, and multichannel performs on-off controller and adjustable resistance, inductance etc.

The exploitation of whole hardware controls part can be divided into following module:

● single-chip microcomputer designs

Design of Hardware Architecture is the first step of whole hardware controls Part Development, and the functional requirement of whole hardware system is mainly analyzed clear by the design of single-chip microcomputer, and design hardware logic structure realizes these functions.

Our hardware controls part relates to five series products, and related products are very many, and the design of single-chip microcomputer needs to design for each product, then integrates.

● hardware composing

After single-chip microcomputer has designed, need to carry out hardware and choose.After having chosen, carry out the assembling of hardware according to design.

● embedded programming and debugging

After hardware composing completes, need to start embedded programming.Need to develop short and pithy and powerful program, embed hardware system.Write complete, need to carry out debugging efforts.

B software section

The client and server end of simulation software part has many similaritys, and we first introduce the modules of emulates client, and the proprietary feature then for service end is introduced.

● user's processing module

User's processing module primary responsibility user login, authentication, password amendment etc.No matter be that student logs in client, or teacher's login service end, all need to carry out authentication.Log in successfully, the password of user oneself can be revised.

We utilize the md5 encryption function of standard to be encrypted user cipher.

The full name of MD5 is message-digest algorithm5 (md5-challenge), is widely used in encryption and decryption technical.Such as in unix system, the password of user is exactly be stored in file system after encryption with md5 (or other similar algorithm).When user logs in time, system becomes md5 value the cryptographic calculations that user inputs, and then the md5 value gone and be kept in file system compares, and then determines that whether the password inputted is correct.By such step, system when and just can determine the legitimacy of logging in system by user when not knowing the plain code of user cipher.

The basic procedure of authentication is as Fig. 4.

● interface module

Interface portion client and service end group basis are consistent.

Main interface various piece is introduced:

1) menu drawing field

According to reality, the various function of system and setting are enumerated out, be supplied to customer selecting.

2) toolbar viewing area

More conventional menu item, we provide the testing tool that will need in maintenance in toolbar area in addition, such as, voltage table, oscillograph etc.User can selection tool in the maintenance process of reality, then, tests etc.

3) virtual screen viewing area

The display (such as, all kinds of TV screen) of various virtual product is provided in this block region, is carrying out in maintenance operation, simulating actual screen.In maintenance, after user sets fault, can operate virtual product, the performance that will break down, such as, unglazed sound etc.After student carries out correct maintenance operation, virtual screen shows normally automatically.

Certainly, also can simulate for audio product, the operation interface of virtual screen display audio product, can audio plays (such as, radio station sound).

Virtual TV screen shows mainly through video, lowers use the video image be embodied in database in advance to show in various different situations and state.

4) wiring diagram viewing area

The electronic-circuit diagram of all kinds of audio and video equipment is shown in wiring diagram viewing area, electronic-circuit diagram can carry out convergent-divergent, device on circuit diagram etc. all distinguishes objectification, such as virtual voltmeter etc. instrument can be used to measure etc. them, carrying out in the process of keeping in repair by each device of test, failure judgement reason, can carry out device renewal etc.

Wiring diagram viewing area not only can show electronic-circuit diagram, and can show real printed circuit board (PCB) (PCB) figure, equally, picture exists some can measurement point or region, student can use instrument to operate equally.Printed circuit board (PCB) is not polar plot, in order to keep authenticity, so only with translation, and cannot convergent-divergent.

Two kinds of display modes are provided to consider mainly for student.Elementary or intermediate student can be familiar for the circuit board direct control that the sense of reality is stronger; For the senior student being proficient in circuit diagram, abstract circuit diagram operates more convenient on the contrary.Therefore, in order to adapt to the demand of student's different levels, we provide two kinds of display modes.

5) virtual instrument viewing area

Instrument viewing area, when user selects testing tool, shows corresponding instrument face plate.When a measurement is taken, dynamically measurement result is provided.Such as, when use voltage table is measured, the pointer of gauge field voltage table points to corresponding readings automatically; And when using oscillographic, what reflect is oscillogram.

6) status display area

Mainly current state is pointed out in status display area.Such as, when emulating playback, the display of a progress is provided; Equally, the process carrying out operating student also can carry out the auxiliary of part and prompting etc.

7) the distinctive interface element of simulation software teacher side:

Student monitors

Student's monitoring is the distinctive part of service end, and teacher can be switched to the simulation operations channel of each student, and we will provide the floating toolbar of student's list [similar OICQ], and can automatically hide, teacher selects student easily, switches emulation channel.

● virtual product

In virtual screen viewing area, need the model showing all kinds of audio and video equipment, we are referred to as virtual product.Such as, the virtual product of the product of colour TV class mainly virtual TV screen and virtual remote controller; The virtual product mainly virtual radio cassette player (adjustable, can to record, can play, have most functions of true radio cassette player) that radio cassette player is corresponding.

Our all kinds of virtual products are all packaged into independently control, provide attribute and method, can control easily.We tentatively enumerate the virtual product needed below:

1) virtual product that sound equipment class is corresponding comprises: the sound system of virtual radio cassette player, virtual electric tuning radio cassette player, virtual synaeresis sound, virtual car sound equipment, virtual active loundspeakers, virtual power amplifier, virtual digit audio process, virtual digit pulse power amplifier, virtual dynamic digital ambiophonic system, virtual Dolby Surround sound system, virtual tonequality enhancing system, virtual home movie theatre.

2) virtual product that dvd playback class is corresponding comprises: virtual CD, virtual VCD/DVD.

3) virtual product that colour TV class is corresponding mainly virtual color televisor.

4) virtual product that New digital video product class is corresponding comprises: virtual LCD, virtual PDP, virtual DLP.

Virtual product corresponding to Video Camera class comprises: virtual video camera, virtual video recorder.

5) certain, virtual product also comprises the virtual remote controller of various audio & video equipment.

In a word, virtual product is very abundant, and function is true to nature, reaction product just.

Virtual product not only needs emulator high, and needs comprehensively to programme controllability, because our fault is ever-changing, need virtual product to reproduce flexibly, really, this must propose high requirement to the controllability of virtual product.

● circuit diagram display module

Circuit diagram display module is used to the electronic-circuit diagram showing all kinds of audio and video equipment.Circuit diagram display module not only needs various wiring diagram to show, and needs to realize many functions.Conventional function has stepless zooming, translation, location and shows at many levels; Special function is that objectification is selected, and provides measurement point, can replace the device of these objectifications.

The objectification display of circuit diagram is very necessary, because the device only having the various needs in circuit diagram to relate to all objectifications, could be selected in the engineering measured, and can replace, and changes the attribute of object, cause a series of change.In a word, objectification is the key of circuit diagram display.

● circuit board display module

Circuit board display module is the real circuits plate of display various product, and can operate circuit board figure, can carry out the routine operation such as translation, location, due to the demand of authenticity, zoom operations here can not be supported.

For real circuit board, the measurement point many according to device sets or region, instrument can be measured at measurement point or region.Device is changed and can be carried out equally.

● virtual instrument

Virtual instrument is the emulation to audio and video equipment maintenance surveying instrument, provides the panel of these instruments, provides data to show for virtual measurement operation.

In general, student or teacher have selected surveying instrument at toolbar, and virtual instrument will show on interface.When student and teacher measure time, virtual instrument shows reading automatically.

Virtual instrument all adopts the mode of control to develop, and each Instrument package dresses up a control, and provide interface to carry out control reading, software is operated by the interface of control.Main virtual instrument is by voltage table, oscillograph, inductance measuring meter etc., and the necessary instrument of all maintenances all can have corresponding virtual instrument.

● simulation engine

Simulation engine, as the engine of whole analogue system, is the core of analogue system, is the key that whole system is moved up.

1) simulation part separation structure is shown in Fig. 5

Emulates client or service of simulation end be all adopt this structure, simulation engine is as core.

2) emulated execution step

In order to the structure above more clear interpretation, we illustrate the process that whole analogue system is run, and we are observed by the angle (angle of teacher is similar) of student.

Student opens emulates client, logs in and enters system;

Student selects to emulate content, such as, selects television fault 1-" have light noiseless ";

System reads client database according to the selection of student, will read the fault script (all faults have unique script of oneself correspondence, otherwise fault is unavailable) of selected fault.

Simulated fault scripts pass is to simulation engine, simulation engine is according to the setting of script, enter original state (Start system-specific, each script only has one), simultaneously, carry out various relevant setting, the action corresponding according to original state in script, need the image showing " have light noiseless " on screen ...

All be disposed, simulation engine is in original state, waits for emulation command;

Emulation command is generally from three places:

(certainly, service end is exactly the operation of teacher) of the operation initiation of student;

From the digital recording file operated before student, be commonly referred to as emulation command script;

Carrying out automatic network, for student, is exactly the on-the-spot demonstration of teacher; For teacher, it is the operation from student.

Emulation command is delivered to simulation engine and is all integrated in emulation command queue; Queue has a pointed when the emulation command of pre-treatment; Current emulation command is after command module is explained, be supplied to simulation engine to perform, simulation engine can control all GUI parts (such as, virtual screen, virtual instrument, circuit diagram etc.), for the operation that emulation command produces, the State Transferring relation according to the definition of simulated fault script moves;

Through the transfer of some states, if according to simulated fault script, simulation engine arrives final state (End system-specific, each script only has).Arrive final state and represent being successfully completed of maintenance job!

3) simulated fault script

As shown in Figure 6, finite state transmission diagram is the core of simulated fault script, simulated fault script must comprise such finite state transmission diagram, original state and final state must be there is, and between original state to final state, need at least there is a path, original state can arrive final state; Otherwise such fault script will cause simulation engine forever can not successfully terminate, and can not keep in repair successfully.

Certainly, be only inadequate with this state transition graph, also need to store some other necessary content at simulated fault script:

The overall situation arranges (Global Setting)---the optimum configurations of the overall situation;

State parameter (State Parameter)---the parameter of each state, character and action etc.;

4) feature of this kind of simulation architecture is adopted

The simulation architecture of setting forth before us is adopted to have following feature:

The versatility of height, can be applicable to the audio frequency of the overwhelming majority, the emulation of video product;

Easy expansion, the proposition of simulated fault script, greatly can improve the extendibility of system, only needs to design the simulation scale of new fault script with regard to energy expanding system;

Feasible, and meet the requirement of maintenance operation; Although the emulator adopted in this way does not reach principle level, for the maintenance job that operation is relatively simple and clear, such emulation is enough, and is feasible; The emulation feasibility that is whether necessary and that implement of principle level is all worthy of consideration, another problem, and the requirement harshness (not being that general PC can smoothly run) of the running environment of the emulation platform of principle level, should not promote.

Operation evaluation analysis, digital recording and playback etc. are all easy to realize on this simulation framework, greatly reduce system complexity.

● command module

Because client and service end are transmitted by the mode of order, so need a command interpretation module, be responsible for understanding the order of transmitting each other.

Our Command design needs to consider the requirement reducing correlativity, and the design of order just needs independent and complete, generally adopts the mode of order+parameter array, order and relevant all parameters is transmitted in the lump.

Command interpretation needs the correctness of verification command, resolve command form and command context, is supplied to simulation engine and emulates.Certainly, what command module parsed is not exclusively also all emulation command, and also can make other order data, these needs specify in command definition.Such as, we also use command module when discussing authentication above, and order is at this time not just emulation command, but belongs to authentication command.

● digital recording and playback

Above in the process that simulation engine is discussed, we know that engine maintains command queue, and time when these order distance emulation start also saves, and therefore, only needs these command sequences and relative time to carry out preserving.Playback the sequence of operation of preserving above in order, is temporally passed to simulation engine perform.We provide a progress hurdle and control group in the process of carrying out playback, the adjustment can accelerate broadcasting speed, slowed down, and the function of rollback also can realize because the state just returned above and with.

● network communication module

Network communication module is responsible for the mutual communication between client and service end, and network communication is divided into two large divisions.A part is TCP/IP communication module, mainly comprise link establishment, link communication, go offline reconnect, link-down etc.; Another major part is multicast communication part, mainly contains that multicast adds, communication, to exit etc.

Generally speaking, all network communications are encapsulated in network communication module, as long as need to carry out network communication Anywhere to call network communication function.

● interface between software and hardware

Soft or hard interface is mainly for hardware control, and in general, the interface of hardware control is all serial ports, adopts RS232 communications protocol, therefore needs to encapsulate a set of serial communication function, and according to the communication protocol of predefined, what provide with hardware is mutual.

● Virtual Class client

Virtual Class client is responsible for student and is held all functions that can have, and such as, speech of raising one's hand, freely makes a speech and talk etc. one to one.In a word, Virtual Class client functionality is far less than Virtual Class service end.

The peculiar function of teacher side software:

● student monitors

Student's monitoring is the special function of service end, and teacher can be helped to carry out student's monitoring, as long as teacher clicks the student's channel needing to watch, service end simulation software automatically switches to the operation channel of student, and teacher can see the fact of student in client operation.

● operation evaluation analysis

Operation evaluation analysis is based upon on the basis of simulation engine, and we know, order is left in command queue when process emulation command by simulation engine; In simulated fault script, there is the correct sequence of operation, as long as compare, judge that student has carried out how many maloperations and independent operations, mark.

If want just, the fairness that strengthen scoring, need to increase the consideration to the running time, namely student carries out the time-consuming of every operation, and time and correctness should exist a fixing proportion, the Grasping level of comprehensive descision student and skill level.

The statistics that Operations Analyst can be carried out according to above maloperation, independent operations and running time, provides statistics and makes a comment or criticism accordingly, such as, points out in detail to there is no need completely in that step, belongs to independent operations; Be wrong in that step, belong to maloperation; In that step too much etc. suggestion consuming time.

(5) Simulation Software System service end

Simulation software service end, except having the processing module corresponding with simulation software, also has following functions module:

A authentication service

Authentication service is that service end is supplied to client and carries out authentication and use, the user data of authentication service access services client database, and the user+MD5 (password) that client passes over compares, and the result is returned to client.

B Virtual Class service end

Functional description above has clearly explained that Virtual Class needs the function realized, and teacher needs the order that can control whole classroom.

Under order state, arrange speech token (only for student's), only have the student obtaining token to make a speech, making a speech completely initiatively discharges token, facilitates other student to make a speech.In order to ensure the fairness of Virtual Class, may need to note following factor in implementation process:

Token is maximum holds the time: after student has token, needs to make a speech in token maximum holding in the time; Otherwise, automatically discharge token;

Token waiting list: after student raises one's hand, enters token waiting list and waits for, once token is idle, distributes in queue immediately and come the most front student.

In a free state, without any order, everybody makes a speech arbitrarily.

Having any it should be noted that, under order state, is all one-to-many, is that all full classroom of speech of Teacher's Day or student can be seen; But in a free state, provide man-to-man secret words pattern, the independent discussion between student can be facilitated, teacher and student also can be made to teach etc. one to one.

(6) database

A service end database design

Carry out the database design of service end, need to focus on improving data access performance, each Data Sheet Design of database is reasonable, adopts third normal form etc. database design specification.

In order to improve versatility, the extensibility of system, the design of database is particularly important.Good database design is expansion from now on, upgrading etc. will provide very large help.

In addition, the security for database access also needs to arrange.

B database design

Introduced the formation of client database above, in fact, the design of client database is comparatively simple.Major part directly adopts the design of the tables of data of service end, because client part table is directly the reflection that service end is shown accordingly.Arrange etc. for some other client this locality, key is exactly need to consider comprehensively.

Claims (4)

1. for a matter emulation maintenance of nuclear for domestic electronic appliances, it is characterized in that: described system comprises: machine for student, teacher computer, systematic manager, analogue system server and database, can realize:

User authentication;

Real simulation is carried out to the phenomenon of the failure of software electrical product and failure condition;

Accident design, by accident design function module design fault script, at the displaying contents etc. of the phenomenon of script inediting fault, maintenance step, route survey;

Digital recording, playback, each step of the simulation operations process of teacher or student is recordable, and digital recording is exactly preserve each step whole process of simulation operations, not only preserves operation, and the relative time that operation occurs also needs to preserve;

Network interaction, system provides the reciprocal process that a series of instrument is supported in teaching process in teacher and student;

Operation evaluation is analyzed;

Teacher demonstrates, and teacher can select the class period to force to allow all students watch the process of demonstration simultaneously, and student also can, at the demo content of attending class of program request free time teacher, carry out reviewing and consolidating;

Monitor and instruct, what operation information was real-time is sent to teacher computer by network, make teacher computer can real time monitoring to the operating conditions of any one student;

Management maintenance, carries out management maintenance to system;

Virtual Class, the teacher being positioned at service end has the highest control in classroom;

Auto-update.

2. the matter emulation maintenance of nuclear for domestic electronic appliances according to claim 1, is characterized in that: described matter emulation maintenance of nuclear comprises: management software part, accident design part, automatic updating system part, analogue system client, Simulation Software System service end, these parts of database.

3. the matter emulation maintenance of nuclear of domestic electronic appliances according to claim 2, is characterized in that: described accident design part comprises user authentication, interface module, circuit diagram editor module, circuit board editor module, constitutional diagram editor module, script-editor, aid.

4. the matter emulation maintenance of nuclear of domestic electronic appliances according to claim 3, it is characterized in that: the simulated fault script of described accident design part must comprise such finite state transmission diagram, original state and final state must be there is, and between original state to final state, need at least there is a path, original state can arrive final state.