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MPC4 200-510-070-113 机械保护卡

 

What is Vibration Monitoring

A vibration monitoring system is a tool that looks for irregularities and other anomalies in a machine's health by measuring its vibration levels. It helps to protect the facility, the process and the people. If you want to know the specifications and prices of Digital Governor, please contact us!

 

Advantages of Vibration Monitoring

 

 

Prevents Costly Downtime
One of the main benefits of machine vibration monitoring is that it can help you prevent costly downtime and keep the process running. By understanding the condition of your machines and catching problems before they turn into failures, you can keep your machines running and save yourself the money that would have been lost had the machines broken down. In addition, this will allow your employees to spend time on more productive tasks.


Increases Overall Safety
Another benefit of vibration monitoring is that it can help you increase overall safety. Hazardous conditions can arise when a machine is running roughly. You can take preemptive action to keep your employees safe and out of harm's way with vibration monitoring. The sooner issues are detected, the more likely it is that they will be easily fixed. In addition, this type of proactive maintenance will save you money in the long run and make your machines safer for everyone who works around them. There is nothing more important than the safety of your employees. Having a reliable choice is being proactive about employee safety and is a huge added benefit to using a robust machinery vibration analysis.


Saves Money on Repairs
Vibration monitoring can help you save money on repairs. When an issue is detected early, less work will be needed to correct the problem, and you'll be less likely to have to replace a machine because of extensive damage. In addition, with vibration monitors, you can be proactive about the condition of your equipment and avoid major production failures.
This will also save you money on the labor required for maintenance on machine repairs. Instead of spending the time and money to fix a machine, you can spend that time and energy on other projects. This boost in efficiency, productivity, and increased savings will have a tremendous impact on your bottom line.


Understand Your Machines
The best benefit of vibration monitoring is that it allows you to understand your machines. By understanding each machine's normal vibration readings and detecting when something is wrong, you can discover problems and make repairs right away. This understanding will help you keep your machines running longer and more efficiently.


Get Better Performance From Your Machines
Machine vibration monitoring can help you get better performance from your machines. Having data to show when problems are detected makes it easier for you to decide how to improve your machines' performance.
A vibration switch will help you do this. This protection device senses vibration through its vibration switches and triggers an alarm or shuts the machine down if it reaches a specific threshold. This will help keep your machines running longer and avoid catastrophic shutdowns and machine issues.

 

Types of Vibration Monitoring
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Strain Gauges
One type of vibration sensor is the strain gauge, which is a foil that's applied directly to the surface of the machine being monitored. The foil contains an electrically conductive grid. As the grid is stretched or compressed—such as when that piece of equipment is vibrating—it changes the electrical resistance of the grid. By reading changes in the grid's resistance, an electric current passing through it will take more or less time to get through.
Those readings can be used to measure the vibration of an object based on how much the material is "straining." In order to work properly, strain gauges need to be perfectly bonded to the surface, meaning installation can be a bit time consuming.


Accelerometers
By far the most common types of vibration sensors, accelerometers measure the changes of velocity of a given component. When attached to a piece of equipment, any vibration will reflect a change in velocity, which will cause the accelerometer to produce an electrical signal. That signal is then interpreted to produce vibration data.
The most commonly used type of accelerometer is a piezoelectric accelerometer, which produces a strong, clear signal at most frequencies. However, piezoresistive accelerometers are becoming more popular due to the fact that they are better at high and low frequencies. The drawback is they cost up to five times as much as piezoelectric sensors.


Eddy-Currents
An Eddy-Current sensor is a non-contact sensor that produces magnetic fields which are used to measure the relative movement of a given object. If the sensor is fixed in place and the object is vibrating, that movement will register in the magnetic field. Capacitive displacement sensors work in a similar way, but with strong electric fields instead of magnetic fields.
Since Eddy-Current sensors measure relative movement (i.e. movement relative to the sensor's position), they must be fixed in place. The fact that they don't need to make contact with the asset makes them ideal for delicate assets or setups.


Laser Displacement
Like Eddy-Current sensors, laser displacement sensors are non-contact sensors, except instead of using magnetic fields and electric currents, they use a laser beam with triangulation. The beam is aimed at the asset and reflects back through a receiving lens into a receiving element. Any changes in the object's position will cause the beam to hit a different part of the receiving element.


Gyroscopes
A gyroscope is a contact sensor that measures angular velocity, which is how quickly something turns or rotates. They do this by using MEMS (microelectromechanical systems) technology, which provides accurate measurements of how many degrees an object rotates per second.
In vibration monitoring, gyroscopes aren't typically used on their own. Instead, they're used to supplement the data you'd get from an accelerometer with orientation data.


Microphone Sensors
Vibrations create sound, and that sound is often beyond the range of human hearing. Microphone sensors—also called acoustic pressure sensors—can provide some basic information on changes that might occur in high-frequency vibrations that equipment operators wouldn't normally be able to detect.
Microphone sensors have the benefit of being highly cost effective, though the information they provide is fairly limited.


Vibration Meters
A vibration meter is a handheld device used to analyze vibration data and put it into a readable format. They often include accelerometers, but models that do not can be connected to an installed accelerometer to give you a quick look at the current health of the asset.

 

Applications of Vibration Monitoring
 

Wastewater Sump Pump
Pumps are crucial for processing wastewater. Due to the distance of some facilities, they may be minimally attended. Cavitation is one of the many possible pump issues. Bursting vapor bubbles cause vibration and the higher pressure can damage impellers. Remote monitoring instantly alerts technicians to unusual vibrations that could eventually cause drainage issues, unwanted tank level changes, or other pump malfunctions.

 

Boiler Feedwater Pump for a Cooling Tower Fan
A boiler feedwater pump drives feedwater into a steam boiler. Problems, such as loose bolts, can be detected by installing sensors on the main pump. Screen and recognize problems of this type by monitoring vibration for changes in condition. Impending problems—such as improper suction pressure, discharge pressure, flow, pump speed, or power—can be detected using vibration screening. Vibration sensors will also send alarms when vibration exceeds pre-set limits.

 

Cleanroom Fan
Efficient and effective cleanroom design, construction, and operation are critical to meeting strict ISO cleanroom specifications. More than 30 different industries use cleanrooms, approximately 70% of which are used by semiconductor, pharmaceutical, and biotechnology businesses. Keeping cleanrooms contaminate-free is crucial.
Associated cleanroom fans, such as fan-filter units (FFUs) play a key role in keeping cleanrooms clean. Fans located outside of a cleanroom, however, such as in a HVAC system can also affect cleanroom conditions if they malfunction. Fan or drive belt failure can cause loss of control of critical cleanroom parameters. HVAC failure can be avoided by adding remote sensors to monitor vibrations from bearings, fan impellers and drives.

 

Mining Plant Conveyer
Remote and grueling mining environments often hosts expensive equipment that is highly susceptible to dust and dirt. Conveyors are one of the most critical assets used during excavation and can be located above or below ground. Excavator conveyer systems—including the motor, gearbox, and roller bearings—can be difficult-to-reach. By adding remote vibration sensors, technicians can measure and monitor conditions from a safe distance. Changes in condition may be early indicators of misalignment or structural looseness in essential machinery.

 

Meat Processing Plant Chiller
Process chillers are complex machines comprised of a compressor, condenser, evaporator, pumps, pipes, high-pressure refrigerant relief valves, and more. All this equipment works together to keep meat safe for consumption by controlling temperature, humidity, and air circulation. As with any motorized equipment, bearing wear is the main culprit for equipment failure. Vibration sensors provide early warning of refrigeration equipment faults and help prevent inadequate chilling performance.

 

Bread factory mixer
A pizza factory can produce up to 50,000 pounds of dough per day using multiple pumps and motors. Equipment moves flour from the silo to an agitator motor that mixes dough. Machinery makes the dough and even flattens them into pies. Pizza dough pies then travel down a motor-driven conveyer belt and finally go into onsite machine-made boxes. Determine if your assets anywhere along the production line are experiencing premature wear by installing remote vibration sensors.

 

Football Stadium HVAC Fan
Supplying ventilation in an enclosed football stadium requires a complex and elaborate system. Loss of HVAC fans during a football game in an enclosed stadium may send chills up a game attendees' spine. Operational failure is not an option, especially with 100,000 spectators. Remote sensors enable operators to monitor vibration in critical motors and pumps, and keep the game moving.

 

Construction Site Dewatering Pump
Clogging is the most common cause of dewatering pump failure. These pumps are used to remove groundwater during major construction projects, often in remote locations. Corrosion, lack of lubrication, or contamination are the main causes of pump failure or bearing wear. Impeller imbalance—the rotating part of the pump—may also result in vibration. If left unchecked, these faults can decrease pump reliability and may ultimately cause extensive, costly damage.

 

Hospital Pumps and Fans
Hospitals contain a myriad equipment critical to ventilation and clean air circulation. Equipping valuable assets with remote sensors can help hospital maintenance ensure that equipment is healthy. Imbalance, looseness, coupling wear, misalignment, bad bearings, and rotor cracks all cause excess vibration in fans. By monitoring the condition of critical assets, repairs can be made before a system fails.

 

Elements of Setting Up a Vibration Measurement System
 
Choosing a Vibration Sensor

Every vibration detection system relies on sensors. There are dozens of sensors to cover all sorts of needs. However, they can be broadly categorized into three distinct types. Accelerometers and contact vibration sensors are directly attached to machines, while non-contact vibration sensors use indirect means to sense vibration.
Accelerometers: Piezoelectric accelerometers are one of the most common vibration sensor types around. When they experience acceleration, they produce an electrical current that can be measured. These can detect low-frequency vibrations and high-frequency vibrations alike, and are also very useful for shock measurements. These sensors output measurement in g's, which can be captured and analyzed.
Contact Vibration Sensors: There are several sensors that make contact with machines but do not rely on accelerometer technology. Strain gauges, for example, activate when stretched or compressed. These are extremely versatile and produce accurate results. However, they're expensive to install and collect data from.
Gyroscopes also fall into this category. They measure angular rate and output a value in degrees per second. Gyroscopes can help you plot the exact path of motion, which is useful for diagnosing problems with your machinery, but they do not yield clear force measurements. Therefore, these are best used in combination with accelerometers to get a clear picture of the vibration's strength and orientation.
Non-Contact Vibration Sensors: These sensors detect vibration through indirect means. Instead of being mounted directly to the part you want to measure, they'll be placed nearby and aim to detect vibration through the air. Microphones, for instance, can detect acoustic pressure caused by vibration and are quite easy to set up. A similar technology called an Eddy current displacement sensor can also work, but is more sensitive to changes in air temperature and pressure, which may make it unreliable in industrial settings.
Laser displacement sensors are accurate and, in some cases, are the only option available. Rotating components can be easily measured with lasers. These sensors measure how long it takes for light to be reflected back to the sensor. When the machine wobbles, this change is measured by the sensor and reported.

Acquiring Your Data

Choosing and mounting sensors isn't even the most difficult part of the process. You also have to collect data from those sensors, which often means complex wiring jobs. Wiring is complex because not only does it have to avoid interfering with the machine's operation, but wires can actually introduce interference into the system which can result in faulty readings from sensors. Fortunately, there are wireless solutions available today that can beam readings to a central hub.
Whether you wire or not, you'll need a device to collect data and relay it to a computer or to an online server. It's important to ensure your capture device is compatible with the types of signals your sensors produce, and that it has enough capacity to measure them all. You may need multiple hubs for larger plants.

Keeping Your Data Clean

Your work still isn't done. Changes in the environment can cause sensors to produce different readings. Temperature is the most important variable to keep track of. While most sensors can operate across a range of temperatures, you may find your readings shift as temperature rises and falls. A temperature sensor coupled with your other sensors can help you compensate for these fluctuations.
Sound vibrations from nearby equipment can also interfere with your vibration measurement. You also have to watch out for damage to sensors due to impacts or corrosive substances.

Analyzing Your Data

When you have clean output from your sensors and your data has been gathered and uploaded to a computer, you'll be able to analyze it and detect errors before they become full shutdowns. Instead of relying on routine maintenance schedules, you can proactively address machines as they start to operate out of spec.

 

 
Frequently Asked Questions
 
 

Q: Why is vibration monitoring important?

A: Vibration monitoring is important because it provides early warning signs of equipment problems, allowing for preventive maintenance, reducing downtime, improving reliability, and extending the lifespan of machinery. It is a key part of predictive maintenance programs in industrial settings.

Q: What types of equipment benefit from vibration monitoring?

A: Equipment such as motors, pumps, compressors, fans, turbines, generators, gearboxes, and other rotating machinery benefit from vibration monitoring. Any equipment with moving parts that are prone to wear or misalignment can be monitored for vibration to prevent breakdowns.

Q: How does vibration monitoring work?

A: Vibration monitoring works by placing sensors on machinery to measure vibration levels. The sensors send the data to a monitoring system, which analyzes the vibration patterns. Changes in these patterns can indicate mechanical issues, such as misalignment, imbalance, or bearing failures.

Q: What types of sensors are used in vibration monitoring?

A: Common sensors used in vibration monitoring include accelerometers, velocity sensors, and displacement sensors. Accelerometers are the most widely used and measure the acceleration of vibrations, providing detailed data for analysis.

Q: What is the role of an accelerometer in vibration monitoring?

A: An accelerometer measures the acceleration forces caused by vibrations in a machine. These forces are proportional to the vibration's intensity and can be used to detect mechanical problems. Accelerometers are essential in capturing high-frequency vibrations for detailed analysis.

Q: What is the difference between online and offline vibration monitoring?

A: Online vibration monitoring continuously monitors equipment in real-time, providing instant data and alerts for any abnormalities. Offline vibration monitoring involves periodic data collection, where measurements are taken at specific intervals, often as part of a routine maintenance schedule.

Q: What are common causes of excessive vibration in machinery?

A: Excessive vibration in machinery can be caused by imbalance, misalignment, loose components, bearing failures, gear issues, structural resonance, and electrical faults in motors. Monitoring these vibrations helps identify the root cause before it leads to equipment damage.

Q: What is vibration analysis?

A: Vibration analysis is the process of examining vibration data collected from sensors to determine the condition of machinery. By analyzing vibration patterns, frequency, and amplitude, technicians can diagnose issues like unbalance, misalignment, or bearing wear.

Q: How often should vibration monitoring be conducted?

A: The frequency of vibration monitoring depends on the criticality of the equipment and the operational conditions. High-risk or critical machines may require continuous online monitoring, while less critical machinery might be monitored periodically (e.g., weekly or monthly).

Q: What is a vibration spectrum?

A: A vibration spectrum is a graphical representation of the vibration levels of a machine across different frequencies. It shows the amplitude of vibration at various frequency points, helping to identify specific issues such as imbalance, misalignment, or bearing defects.

Q: What are the consequences of ignoring excessive vibration?

A: Ignoring excessive vibration can lead to increased wear and tear on machine components, reduced efficiency, and ultimately, catastrophic failures. This can result in costly repairs, unplanned downtime, safety hazards, and shortened equipment lifespan.

Q: What is resonance in vibration monitoring?

A: Resonance occurs when the natural frequency of a machine component matches the frequency of an external force, causing excessive vibration. Vibration monitoring can detect resonance by identifying abnormal increases in vibration amplitude at specific frequencies.

Q: How is vibration monitoring used in wind turbines?

A: Vibration monitoring in wind turbines is used to track the health of components such as bearings, gearboxes, and generators. By detecting abnormal vibrations, operators can perform preventive maintenance to avoid costly failures and extend the lifespan of the turbines.

Q: What are the advantages of wireless vibration monitoring systems?

A: Wireless vibration monitoring systems provide flexibility in installation, reduce the need for complex wiring, and allow for remote monitoring in hard-to-reach locations. These systems are ideal for large industrial facilities or for monitoring equipment in hazardous areas.

Q: How does temperature affect vibration monitoring?

A: High temperatures can affect both the sensors and the machinery being monitored, potentially leading to false readings or premature sensor failure. Vibration monitoring systems used in high-temperature environments must be designed to handle thermal conditions to ensure accurate measurements.

Q: What is a proximity probe in vibration monitoring?

A: A proximity probe is a non-contact sensor used in vibration monitoring to measure the displacement of a machine component relative to a fixed point. These probes are often used in rotating machinery such as turbines and compressors to measure shaft displacement.

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