Electromechanical Equipment Detection and Diagnosis What are the characteristics of vibration? 5

The vibration sensor is mainly composed of a sensor cover, a counterweight mass, a pressure ring, a spring diaphragm, a printed circuit board, a magnetic ring, a closed cavity and other parts, as shown in Figure 1. A total of two vibration sensors are installed in the system.

The signal processing system mainly includes three parts: signal input unit, judgment unit and signal output unit. The signal input unit mainly converts the signal collected by the sensor into input. The judgment unit makes judgments on the data. The signal output unit is used to output the command signal.

The display system includes two parts: the display and the printer, which mainly display the vibration position, vibration amplitude, damage degree and processing of the equipment on the display screen in real time, and use the printer to print out the vibration curve diagram of the equipment.

The characteristics of electromechanical equipment detection and diagnosis of vibration, the complexity of equipment problems, and the automation of electromechanical equipment require professional knowledge to detect and repair.

The characteristics of electromechanical equipment to detect and diagnose vibration are based on the power of the machine.

The characteristics of several equipment detection and diagnosis vibration, that is, the quality of the product can be judged by the frequency of vibration.

Now the electromechanical equipment detection and his diagnosis, I think the characteristics of vibration are still very close, and it can still bring us all good use.

Your electromechanical equipment is better than the characteristics of real vibration, I suggest you wait for you to come, and I will consult.

Now the electromechanical equipment detection and its diagnosis, its vibration, its characteristics are still very clear, and can still bring us all good.

The characteristics of electromechanical equipment detection and diagnosis of vibration, you can look for professional people or check those small ones on the Internet, pay more attention to it.

Its detection and diagnosis are very special characteristics of vibration, which may have a certain pattern.

Summary. Hello dear, it's a pleasure to serve you! <>

The most commonly encountered vibrations in condition monitoring of electromechanical equipment belong to periodic vibration, approximate periodic vibration, narrowband random vibration, and broadband random vibration.

The most commonly encountered vibrations in condition monitoring of electromechanical equipment belong to:

Hello dear, it's a pleasure to serve you! <>

The most commonly encountered vibrations in the monitoring of potato state in the electromechanical equipment belong to periodic vibration, approximate periodic vibration, narrowband random vibration and broadband random vibration.

According to the law of vibration, mechanical vibration is generally divided into two types: deterministic and random, which are mainly divided according to the change characteristics of vibration in time history. The vibration types of most mechanical equipment are weekly vibration, quasi-periodic vibration, narrowband random vibration and broadband random vibration, as well as a combination of certain vibration types. Generally, the vibration signal in the process of starting or stopping is non-stationary.

In actual operation, the periodic signal of the equipment is often drowned in random vibration signals. If the degree of equipment failure is aggravated, the periodic component in the random vibration will be strengthened, and the vibration of the whole equipment will increase. Therefore, in a sense, the process of diagnosing the vibration of equipment is the process of extracting periodic components from random signals.

Classification by Causes of VibrationThe root cause of vibration in machines lies in the presence of one or several forces of excitation. Different types of vibrations are provoked by forces of different natures. According to this, mechanical vibrations can be classified into three types:

1) After the free vibration gives a certain amount of energy to the system, the vibration produced by the system is not clear. If the system is not damped, the system maintains equal amplitude vibration; If the system is damped, the system is attenuated vibration. 2) The vibration of the forced vibration element or system is caused by the action of periodic changes in external forces, such as imbalance and misalignment.

3) Self-excited vibration is only caused by the excitation generated by the system itself without the action of external force, such as oil film oscillation, surge, etc. The vibration caused by mechanical failure before Qin Yin is mostly forced vibration and self-excited vibration. 3.

Classification by vibration frequencyMechanical vibration frequency is a very important concept in equipment vibration diagnosis. In various vibration diagnosis, it is often necessary to analyze the relationship between frequency and fault, and to analyze the characteristics of vibration in different frequency bands, so it is of practical significance to understand the relationship between the division of vibration frequency bands and the vibration diagnosis carryover. According to the frequency of vibration, vibration is usually divided into 3 types:

Low frequency vibration: f 10hz medium frequency vibration: f = 10 1000hz high frequency vibration:

f>1000

What is the working principle of various vibration diagnostic instruments + what occasions are they suitable for.

Dear, I am glad to answer for you: what is the working principle of various vibration diagnostic instruments + what occasions are they suitable for Answer: 1. Eddy-current vibration sensor Eddy-current vibration sensor is a vibration sensor with eddy current effect as the working principle, and it belongs to non-contact sensors.

The eddy-current vibration sensor measures the vibration parameters of the object through the change in the interval between the end of the sensor and the object to be measured. Eddy-current vibration sensors are mainly used for the measurement of vibration displacement. 2. Inductive vibration sensorInductive vibration sensor is a kind of vibration sensor designed according to the principle of electromagnetic induction.

The inductive vibration sensor is equipped with a magnet and a magnet, and when the vibration of the object is measured, the mechanical vibration parameters can be converted into electrical parameter signals. Inductive vibration sensors can be used to measure vibration velocity, acceleration and other parameters. 3. Capacitive vibration sensor capacitive vibration sensor obtains variable capacitance by changing the gap or common area, and then measures the capacitance to obtain mechanical vibration parameters.

Capacitive vibration sensors can be divided into two types: variable gap type and variable common area type, the former can be used to measure linear vibration displacement, and the latter can be used to determine the angular displacement of torsional vibration. 4. Piezoelectric vibration sensor Piezoelectric vibration sensor uses the piezoelectric effect of the crystal to complete the vibration measurement, when the vibration of the measured object forms pressure on the piezoelectric vibration sensor, the crystal element will produce the corresponding charge, and the charge number can be converted into vibration parameters. Piezoelectric vibration sensors can also be divided into piezoelectric accelerometers, piezoelectric force sensors, and impedance heads.

5. Resistance strain vibration sensorThe resistance strain vibration sensor is a kind of vibration sensor that expresses the mechanical vibration of the measured object by the change of resistance. Resistance strain gauge vibration sensors can be implemented in a variety of ways, and various sensing elements can be used, the most common of which are resistance strain gauges.

A good addition to the vibration analysis of the shock pulse technical analyst at SPM in Sweden.

Mechanical vibration is a special type of motion that is characterized by:

1.With a certain position as the center, the moving particle moves reciprocating through the center and at an equal distance from the center;

2.The length of the distance from one side to the other is called the amplitude, the time taken to make a round trip is called the period, and the number of vibrations per second is called the frequency.

3.After an external force causes an object to vibrate, the external force is removed, and the object continues to vibrate at a certain frequency, which is the natural frequency of the object. Any object and component has its own natural frequency.

4.The vibration of one object can cause the vibration of another object, and when the vibration frequency is the same as the natural frequency of the object, this vibration is called resonance. The amplitude is greatest at resonance.

5 does not vibrate at the natural frequency of the object, but. The frequency of the external force vibrates, and this vibration is called forced vibration.

These are not available in other sports.

There are two methods of vibration measurement: direct method and indirect method.

Direct method: use a laser displacement sensor or eddy-current sensor to directly measure the vibration amplitude and frequency of the motor housing, and record the displacement of the motor in the whole vibration process with a acquisition card. Related Sensors and Parameters:

ZLDS100 laser displacement sensor, highest resolution, highest response frequency eddy current sensor, highest resolution, highest corresponding frequency 50kHz. The two sensors are used in different ways, and the eddy current sensor requires the measured body to be a conductor and the measuring point should preferably have a flat surface. This results in a high degree of accuracy.

The measuring area of the laser sensor is very small, it only needs to be shot on the test body, and there is no requirement for the test body material. The indirect measurement method uses some vibration sensors attached to the motor to measure the acceleration to calculate the amplitude and frequency. This method has the disadvantage that sticking something on the motor itself has its own vibration that affects the vibration of the motor, and the accuracy of measuring acceleration cannot be very high.

3. The dynamic characteristics of mechanical equipment can only be analyzed and studied on the basis of known dynamic models, external excitations and working conditions. Dynamic analysis includes: Calculation or determination of intrinsic properties such as natural frequencies, modal shapes, stiffness, and damping of various orders of mechanical equipment.

Based on the intrinsic properties, it is possible to identify the causes of vibrations, avoid resonances, and provide the basis data for further dynamic analysis. Calculate or measure the dynamic response of the displacement, velocity, acceleration, phase, spectrum and vibration time history of the relevant points when the mechanical equipment is excited, assess the ability of the mechanical equipment to withstand vibration and impact according to the dynamic response, find its weak links and waste links, and provide a basis for improving the design. It is also possible to establish equations of motion for mechanical systems expressed in terms of modal parameters, known as modal analysis.

Analyze and calculate the dynamic stability of mechanical equipment, and determine the instability of mechanical equipment, that is, the critical condition for self-excited vibration. Ensure that the mechanical equipment does not produce self-excited vibration under the condition of giving full play to its performance, and can work stably.

Since the application of techniques such as mechanical impedance, system identification, and modal analysis, many complex vibration problems have been successfully solved. Designing the vibration characteristics of a system so that its response meets the required requirements when the excitation is known is called vibration design. Studying the characteristics of the system under the conditions of the excitation and response of the known system, that is, using the method of combining experimental data and mathematical analysis to determine the mathematical model of the vibration system, is called system identification.

If the general form of the equation of motion of the mechanical structure is known, the system identification is simplified to the parameter identification. Parameter identification can be carried out in the frequency domain, in the time domain, or in both the frequency and time domains. Studying the excitation under conditions in which the characteristics and response of the system are known, is called the environment**.

Vibration design, system identification, and environment** can be summarized as the basic elements of modern vibration research. In the field of mechanical engineering, in order to ensure the safe and reliable operation of mechanical equipment, the vibration monitoring and diagnosis of mechanical structures have also attracted attention. In terms of research methodology, vibration testing is combined with theoretical analysis and calculation.