933 Control Engineering Comprehensive Examination Outline (Version 20 16)

First, the examination composition

Automatic control principle accounts for 90 points; Digital electronic technology accounts for 60 points, with a total score of 150.

Second, the automatic control principle part of the examination outline

General concept of automatic control.

Main contents: tasks of automatic control; Basic control methods: open-loop and closed-loop (feedback) control; Performance requirements of automatic control: stability, speed and accuracy.

Basic requirements: the principle of feedback control and the concept of dynamic process; Construct the principle block diagram according to the given physical system.

2. Mathematical model

Main contents: transfer function and dynamic structure diagram; Transfer function of typical link; Equivalent transformation between structure diagram and mason formula.

Basic requirements: transfer function of typical links; Draw the dynamic structure diagram of closed-loop system; Equivalent transformation of structure diagram.

3. Time domain analysis method

Main contents: typical response and performance index, analysis and calculation of first-order and second-order systems. Analysis and Calculation of System Stability: Routh and Gourvitz Criterion. Calculation and general law of steady-state error.

Basic requirements: typical response (mainly the step response of the first and second systems) and performance index calculation; Influence of system parameters on response; Application of Routh and Gourvitz Criterion: Conditions for Using System Steady-state Error and Final Value Theorem.

4. Root locus method

Main contents: the concept and equation of root locus; Drawing rules of root trajectory; Generalized root locus; Relationship between distribution of zeros and poles and step response performance: dominant poles and dipoles.

Basic requirements: the law of root trajectory (the proof of law only needs general understanding) and the drawing of root trajectory; Principal pole, dipole, etc. Estimation of performance index of step response by root locus.

5. Frequency response method

Main contents: frequency response of linear system; Frequency response and open-loop frequency response of typical links; Nyquist stability criterion and logarithmic frequency stability criterion; Stability margin sum calculation; The relationship between closed-loop amplitude-frequency and step response, the concepts of peak value and bandwidth; The relationship between open-loop frequency response and step response, and the analysis method of three frequency bands (low frequency band, middle frequency band and high frequency band).

Basic requirements: draw the frequency response curves of typical links and open-loop systems (Nyquist curve, logarithmic amplitude-frequency curve, phase-frequency curve); System stability criteria (Nyquist criteria and logarithmic criteria); Waiting for m, waiting for n graph, Nikhilstu only makes a general understanding; Calculation of phase stability margin and mode stability margin; Clear the difference between minimum phase and non-minimum phase system, and clear the concepts of cut-off frequency and bandwidth.

6. Correction method of linear system

Main contents: overview of system design problems; Characteristics and functions of series correction: lead, lag and PID；; Frequency method and root locus method of calibration design; The function and calculation points of feedback correction; Principle and realization of compound correction.

Basic requirements: the function of calibration device and the application of frequency method; Series correction is the main method, supplemented by feedback correction; Frequency method is the main method, supplemented by root locus method; Application of compound correction.

7. State space analysis method for linear continuous systems

Main contents: the column writing of state equation; The solution of the state equation (matrix index and its properties); System equivalent transformation; The relationship between state equation and transfer function; Controllability, observability and their criteria of the system; Canonical form of dynamic equation (controllable canonical form, observable canonical form); Controllability and observability decomposition; Duality principle, minimum realization of transfer function; State feedback and pole assignment; State observer and its design: bounded input and bounded output stability.

Basic requirements: All points in the above main contents are required, but only for single-input single-output linear time-invariant continuous systems.

8. Nonlinear system theory

Main contents: general characteristics of dynamic process of nonlinear system; Typical nonlinear characteristics and their influence; Harmonic linearization and description function; The stability and self-excited oscillation of the system are studied by description function method. General characteristics and drawing methods of phase trajectory; Phase trajectory of linear system; Phase trajectory drawing and analysis of nonlinear system.

Basic requirements: clearly describe the use restrictions of function methods; Typical link description function; The stability and self-excited oscillation of nonlinear system are analyzed by description function method. Phase trajectory drawing and motion analysis of first-order and second-order nonlinear systems.

Three, digital electronic technology part of the examination outline

(a), the examination instructions

1. The nature of the exam

The joint entrance examination enrolls graduate students for the first-level discipline of automation science and electrical engineering of Beihang University. Its evaluation standard is the passing level or above that excellent undergraduate graduates can reach, so as to ensure that the admitted students have a good theoretical foundation of electronic technology.

2. Assess objectives

The purpose of this course examination is to examine students' mastery of the basic concepts, principles and methods of electronic technology and their ability to solve related problems in the field of electronic technology.

(2), the examination content

1. Master the basic knowledge of logical algebra:

(1) Basic logical operations and symbolic representations, basic formulas, commonly used formulas and basic rules.

(2) Several representations of logical functions, including expressions, truth tables, Karnaugh maps, logic maps and timing charts. (3) the mutual transformation between these representations of logical functions.

(4) Standard sum or formula of function, minimum term and simplest formula of function.

(5) Simplify the function with formula method, Karnaugh map and constrained function.

2. The gate circuit focuses on:

(1)TTL NAND gate circuit, including transmission characteristics, input characteristics, input load characteristics, output characteristics, fan-out coefficient, input noise tolerance, average transmission time and static power consumption.

(2) Calculation of pull-up resistance when (2)OC gate is connected and the output voltage needs to be changed.

(3) The application of tri-state gate and transmission gate in interface circuit.

(4) Fan-out coefficient, input noise tolerance, average transmission time and static power consumption of CMOS gate.

3. The combinational logic circuit mainly grasps:

(1) Several common coding systems, including original code, complement and complement, BCD842 1 code, BCD542 1 code, BCD242 1 code, the remaining three codes and cyclic codes.

(2) Analysis and design methods of combinational circuits.

(3) Analysis of full adder and application of integrated full adder 74LS283.

(4) The analysis of min-term decoder integrates the applications of min-term decoders 74LS 138 and 74LS 139.

(5) Data selector analysis, integrating the application of one-eighth data selector 74LS 15 1 and one-quarter data selector 74LS 153.

(6) Analysis of display decoder and application of integrated display decoders 74LS47 and 74LS48.

(7) The analysis of encoder and the application of integrated priority encoder 74LS 148.

(8) Analysis of digital comparator and application of integrated digital comparator 74LS85.

(9) Analyze the actual logic problems and abstract the logic, and finally design the logic circuit to realize this function with basic gate circuits or common integrated chips.

4. The trigger focuses on:

(1) Functions, characteristic equations, constraints and applications of basic RS flip-flops and synchronous RS flip-flops.

The functions, characteristic equations, timing diagrams, dynamic characteristics and applications of edge JK, D, T and T' flip-flops.

5. The sequential logic circuit focuses on:

(1) Analysis method of sequential circuits, analysis of synchronous binary addition and subtraction counters and asynchronous binary addition and subtraction counters.

(2) The design method of synchronous sequential circuits with or without input variables, the principle of equivalent state merging and state coding.

(3) The method of integrating counters 74LS 160/ 162 and 74LS161163 synchronously to form an arbitrary decimal counter (reset method, set number method) and its application in digital system.

(4) The method of asynchronous integration of counter 74LS290/93 (reset method) and its application in digital system.

(5) Analyze the actual sequential logic problem and abstract the logic, select the type and number of flip-flops, and design the sequential circuit to realize this function.

6. The pulse signal generation and shaping circuit mainly focuses on:

(1)555 timing circuit function.

(2) Hysteresis characteristics, transmission characteristics and input and output voltage waveforms of Schmitt trigger composed of 555 timing circuit.

(3) Calculate the transient time, capacitor voltage, input and output voltage waveforms of the monostable trigger composed of 555 timing circuit.

(4) Calculate the oscillation period and frequency by using the capacitor voltage and output voltage waveform of the multivibrator composed of 555 timing circuit.

7.A/D and D/A conversion circuits should focus on:

(1) inverted T-shaped resistance network D/A converter, and calculate the D/A conversion voltage.

(2) Successive approximation A/D converter, which approximates the given analog voltage step by step to obtain the corresponding digital quantity.

(3) Compare the conversion principles of parallel comparison A/D converter and double integral A/D converter.

(4) Compare the accuracy and speed of parallel comparison A/D converter, successive approximation A/D converter and double integral A/D converter.

(5) Application of typical A/D and D/A converters, such as AD7524 and ADC0809.

8. Focus on memory:

The address lines and bit lines of (1)ROM and RAM are represented by dot matrix, and logic functions are realized accordingly.

Simple applications of ROM and RAM, such as integrated read-only memories EPROM27 16 and 2764.