Among them, the following contents can be obtained:

The amplitude is a;

The period is: t = 2π/w;

The value of (wx+b) when the initial phase is x=0.

For this periodic function, the initial phase is: b

In AC circuit, current amplitude or voltage amplitude refers to the maximum change of current or voltage, also known as the peak value of voltage or current.

In acoustic vibration, amplitude is the maximum difference between sound pressure and static pressure. The amplitude of sound waves is measured in decibels. The amplitude of sound waves can determine the intensity of sound.

The amplitude of simple harmonic vibration is constant, which is determined by the initial conditions (initial displacement and initial velocity) of simple harmonic vibration. The energy of simple harmonic vibration is proportional to the square of amplitude. Therefore, the square of the amplitude can be used as a sign of the dynamic intensity of resonance. The amplitude of forced vibration in the stable stage is also a constant, and the amplitude of damping vibration decreases gradually.

Extended data:

The number of times the vibrating particles complete the total vibration in one second is called the vibration frequency, and the unit is hertz. Frequency is also a physical quantity representing the vibration speed of particles. The greater the frequency, the faster the vibration.

The relationship between period and frequency or its unit relationship is 1hz = 1s (- 1). The vibration frequency (period) of simple harmonic vibration is determined by the nature of the vibrating object itself, so it is also called natural frequency (natural period). The frequency of sound waves determines the tone of sound.

Operation in the initial stage:

(1) The distance the trigonometric function image moves to the left or right = φ/| ω | (Note that the sign of the moving distance is positive to the left and negative to the right. Remember the principle of adding left and subtracting right) but this application is not extensive.

(2) Carry operation method: take a point on the function image, substitute it into the function expression and calculate the initial phase φ.

When the object moves back and forth or the physical quantity changes repeatedly, the time required to repeat it once. The time required for an object or physical quantity (such as alternating current and voltage) to complete a vibration (or oscillation). In various periodic movements or periodic changes, an object or physical quantity changes from any state and always returns to its original state after a period or an integer multiple of a period.

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