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List of contents in this article:

• 1, Is the cut-off frequency of the system equal to the non-damping frequency?
• 2, What is the resonant peak formula of the closed-loop system?
• 3, What is the calculation method of the cut-off frequency?
• 4
  、 What does cut-off frequency mean?
• 5, How to find the cut-off frequency Find

Is the cut-off frequency of the system equal to the non-damping frequency?

1. It doesn't matter. Natural frequency refers to the frequency at which a system tends to oscillate in the absence of external forces or damping. The cut-off frequency is a special frequency used to describe the frequency characteristic index.So the two have nothing to do with each other. Natural relative to artificial. Frequency is frequency, including all frequencies.

2. The cut-off frequency depends on factors such as the damping and stiffness of the system, and is related to the frequency of the input signal.

3. Set w_{ c}w_{ c} as the cut-off frequency of the system, we define the phase angle margin as gamma=180^{ circ}+angle Gleft(j omega_{ c}right) tag{ 2} gamma= 180^{ circ}+angle Gleft(j omega_{ c}right) tag{ 2}.

4. The cut-off frequency is related to the cathode material, and the v0 of different metal materials is generally different.If the frequency v of the incident light is less than the cut-off frequency v0, then no matter how strong the incident light is, it cannot produce a photoelectric effect.

5. When the amplitude of the input signal remains unchanged and the frequency is changed, the output signal is reduced to 0.707 times the maximum value, that is, the cut-off frequency is expressed at the -3dB point by the frequency sound characteristic, which is a special frequency used to explain the frequency characteristic index.

6. In the cut-off frequency calculation formula, wc is w when the modulus value of G(jw)H(jw) is equal to 1. Wc refers to the open-loop cut-off frequency, also known as the shear frequency. It is in the open-loop amplitude characteristic, and the amplitude characteristic curve crosses the frequency of the 0dB line, so it is recorded as wc.

What is the resonant peak formula of the closed-loop system?

Find the unit order response performance index (such as rising time, maximum overmodulation, etc.) of the second-order system. Draw the Naiqui tear special picture Bode diagram and apply the Naiqui tear special stability judgment to judge the stability performance indicators (such as resonance frequency, resonance peak). Introduction: Buddha said: one chestnut, one world.

The resonance peak does not appear when the damping ratio is less than 0.707. It is recommended to use MATLAB, etc.Simulation software can simulate the second-order system with simple devices such as capacitors and resistors. The software will automatically draw the oscillation curve. After the mechanical system measures the damping coefficient, elastic coefficient, mass, displacement and other physical 2113 quantities, the circuit simulation can be built.

If M has a maximum value at a certain frequency, then this frequency is called resonant frequency. It can be calculated that when 0≤ζ≤0.707, the maximum values of the resonant frequency ωr and M Mr are respectively: because only when ζ≤0.707, ωr is equal to a real number, so there is no resonance phenomenon in the system at ζ0.707.

lc resonance frequency calculation formula is: F=1/(2*π*√LC). The calculation formulas of series and parallel circuits are the same. Among them, L stands for inductance, unit: Henry (H), C stands for capacitance, unit: Farrah (F).

The formula for the quality factor of the practical parallel resonant circuit is Q=R/WL=W*C*R, where W is the angular frequency, C and L are the capacitance and inductance respectively, and R is the equivalent parallel resistance of the inductance. Application of resonant circuits Resonant circuits are widely used in electronic technology.

What is the calculation method of the cut-off frequency?

wc cut-off frequency calculation formula is: F=1/(2*Pi*R*C). The cut-off frequency refers to the boundary frequency (generally bounded by -3dB) when the output signal energy of a system begins to drop significantly or rises significantly in the impedance filter.

rc filter cut-off frequency calculation: F (cutoff) =1 / (2πRC).The most basic filter is an RC filter constructed of resistance and capacitor. There are low-pass and high-pass filters. The calculation formula for the cut-off frequency of the RC filter is: F (cutoff) =1 / (2πRC).

This circuit can be used to convert 1kHz square wave into sine wave, as long as the cut-off frequency is set to 1kHz; if you want to convert 100kHz square wave into sine wave, you can also use it, but the cut-off frequency should be re-tuned.

As a standard for determining the cut-off frequency, the energy consumed by the diode series resistance can be used for comparison, that is, when "the size of the diode high-frequency impedance = series resistance", the corresponding frequency is the cut-off frequency fT.

How to calculate the cut-off frequency wc. Cut-off frequency Wc estimation method. How to find the cut-off frequency wb.Automatic control principle cut-off frequency calculation formula. In the cut-off frequency calculation formula, wc is w when the modulus value of G(jw) H(jw) is equal to 1. Wc refers to the open-loop cut-off frequency, also known as the shear frequency.

10 ω) ( ) ( = 20l g L = 20l g 8 ωωj Analysis method for finding the cut-off frequency 1 When ω ω ω, G is in the high frequency band, G, G is still in 1 2 1 2 3 an open-loop system transfer function It is composed of several typical links.

What does cut-off frequency mean?

Cutoff frequency refers to the boundary frequency at which the output signal energy of a system begins to drop significantly (rise significantly in the band-impedance filter).

Commonly speaking, the cut-off frequency refers to the boundary frequency (generally bounded by -3dB) when the output signal energy of a system begins to drop significantly or rises significantly in the impedance filter.

Cut-off frequency refers to the frequency when the frequency of the signal or circuit reaches a certain critical value in signal processing or circuit design. In the frequency range below the cut-off frequency, the response of the signal or circuit will be significantly weakened or truncated.

wc cut-off frequency calculation formula is: F=1/(2*Pi*R*C). The cut-off frequency refers to the boundary frequency (generally bounded by -3dB) when the output signal energy of a system begins to drop significantly or rises significantly in the impedance filter.

Cut-off frequency, that is, when the amplitude of the input signal remains unchanged, the frequency is changed to reduce the output signal to the maximum value of 0.707 times, that is, the cut-off frequency is expressed as -3dB point, which is a special frequency used to explain the frequency characteristic index.

How to find the cut-off frequency

wc cut-off frequency calculation formula is: F=1/(2*Pi*R*C). The cut-off frequency refers to the boundary frequency (generally bounded by -3dB) when the output signal energy of a system begins to drop significantly or rises significantly in the impedance filter.

Generally speaking, the engineering defines the two frequency points ωω2 corresponding to I (η)/I0=1/√2 as the upper and lower cut-off frequencies. At this time, I0 is the resonant current of the circuit.

Make the modulus value of the frequency characteristic G (jw) 1 and then solve the equation.The w value calculated is the cut-off frequency. The transfer function refers to the ratio of the Laplace transform (or z transform) of the linear system response (i.e. output) to the Laplace transform of the excitation (i.e. input) under zero initial conditions.

The method of setting an analog signal function to find its highest cut-off frequency: use the module of the system function to represent the amplification multiple of the circuit. Column relation, F=1/(2*Pi*R*C). It is an approximation method. You only need to take (retain) the amount that has a great impact on the formula in each link.

There is no fixed formula, but the method is fixed. That is, make the modulus value of the frequency characteristic G (jw) 1, and then solve the equation. The w value obtained is the cut-off frequency.