Inch Harmonic Balancer

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Inch Harmonic Balancer
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A growing demand for Active Harmonic filters or commonly known as PF3 - Intelligent Power Quality Filter 3Phase 3Wire is to be seen in the market for a number of applications. It is becoming famous and being used more due to its ability to replace the network harmonics from the supply source. There are many disadvantages of harmonic filters which has been causing serious problems since a very long time. These problems are:

• Capacitor malfunctioning

• Repeated tripping of circuit breakers

• Excitation of network resonance

• Failure of precision control

• High current in neutral conductors

• Damage to equipment

• Overheating of transformer, motor and Wires

Active harmonic filters are completely cost effective and are useful in various important applications. It acts as a solution for problems relating to quality of power. One of its best advantages is that there is no need to worry about the management fees, as it is fully eliminated when Active harmonic filters are used. It also offers parallel connection which is quite beneficial for large systems. There is no need of special current transformers and it offers phase load balancing as well. Easy commissioning, reactive power compensation and intelligent harmonic current predictions are some of its most important applications. It also provides the benefit of offering Advanced Modulation technology to reduce ultra-low harmonic distortion it is highly applicable in Industry and is widely known for intelligent harmonic current prediction as well as selectable harmonic compensation. It also offers user-friendly graphical user Interface with LCD which is very useful for people who have a minimum level of knowledge about how it operates.

With this facility the operators can monitor filter behavior and various components, measure system variables easily, record event log, monitor the status of the work, save the system and process from any sort of a malfunctioning. Moreover the waveform in the graphical display also offers a great advantage to the operator. An operator or a manager can operate it from his/her own personal computer with the help of a remote. The windows based graphical user interface allows the users to manage each task quite efficiently and effectively.

Active Harmonic filter is highly functional and useful as it provides a number of advantages which are comparable to none. Its effectiveness and great performance has increased its demand over the past years leading to the rise of numerous applications in various industries and walks of life.

Thomas Scott invites you to take a look at Power Quality Specialist. A growing demand for Active Harmonic filters or commonly known as PF3 - Intelligent Power Quality Filter 3Phase 3Wire is to be seen in the market for a number of applications.

Vibration Glossary

In the world of mechanical maintenance, vibration remains one of the earliest indicators of a machine's health. Understanding why vibration occurs and how it manifests itself is a key first step toward preventing vibration from causing trouble in the production environment.

For those involved in equipment maintenance and vibration diagnosis, the following is a basic glossary of vibration terms:

Acceleration: The rate of change of velocity often depicted as "g's" or in "mm/s2" in the metric system or "in/sec2" in the English system. Acceleration is not constant but will vary through the vibration cycle, reaching maximum levels as velocity reaches its minimum. This is typically when a particular mass has decelerated to a stop and is about to begin accelerating again.

Accelerometer: A transducer whose electrical output responds directly to acceleration. Accelerometers typically cover a much wider frequency range, along them to pick up signals not present with other types of transducers. Due to the frequency range, accelerometers are ideal for most types of rotating equipment, making them the most used transducer for vibration measurements. 

Alignment: A condition where components within a drivetrain are parallel or perpendicular, according to design requirements. A tester such as the Fluke 810 Vibration Tester* can diagnose misalignment conditions where these components are no longer aligned according to design requirements, causing excessive bearing wear and power consumption in the machine. 

Attachment Pad: Attachment pads (bronze or stainless steel) can be placed at appropriate measuring locations on machines using an industrial adhesive. The triaxial accelerometer is attached to these pads for measurement collection. The pad may include an alignment notch to ensure the consistent orientation of the accelerometer to the three vibration axes (Radial, Tangential, and Axial). The pad ensures a good transfer of vibration data to the transducer by providing a strong and consistent mounting location. 

Axial: One of the three vibration axes (Radial, Tangential and Axial), the axial plane is parallel to the centerline of a shaft or turning axis of a rotating part. 

Balancing: (mechanical) Adjusting the distribution of mass in a rotating element, to reduce vibratory forces generated by rotation.

Condition monitoring (CM): The measurement, recording and analysis of machinery parameters (such as acceleration) to determine machine health. Current condition is compared to when the machine was new. Also known as machinery health monitoring.

Displacement: When measuring machinery vibration, displacement represents the actual distance the vibration causes the part in question to move. It is measured in thousandths of an inch (mils) in the English system and in millimeters (mm) in the metric system. 

Failure: The event, or inoperable state, in which any item or part of an item does not, or would not, perform as specified. 

Failure mechanism: The mechanical or physical parts that results in failure.

Forced vibration: The vibration of a machine caused by some mechanical excitation. If the excitation is periodic and continuous, the response motion eventually becomes steady-state.

Frequency: The number of events that occur within a fixed time period, frequency is also calculated as the reciprocal of time (i.e. one divided by the time interval).  Frequency is typically expressed in terms of Herz (Hz), but can also be expressed as cycles per minute (cpm) or revolutions per minute (rpm) when multiplying Hz times 60. It can also be represented as multiples of turning speed, or "orders," where frequency in rpm is divided by the turning speed of the machine. 

Frequency Domain: Since vibration exists within the time domain, a vibration signal is represented as a time wave form if viewed on an oscilloscope.  If plotted, the time waveform would represent a plot of amplitude vs. time. If the waveform were transformed to the frequency domain, the result would be a spectrum representing a plot of amplitude vs. frequency.  

Harmonic: A sinusoidal quantity having a frequency that is an integral multiple (´2, ´3, etc.) of a fundamental (´1) frequency.

Harmonic Distortion: In the output signal of a device, distortion caused by the presence of frequencies not present in the input signal.

Hertz: (lower-case h, but abbreviated Hz) The unit of frequency.

Imbalance: A condition on rotating equipment where the center of mass does not lie on the center of rotation. Imbalance can severely reduce bearing life as well as cause undue machine vibration. 

Isolation: A reduction in motion severity, usually by a resilient support. A shock mount or isolator attenuates shock. A vibration mount or isolator attenuates steady-state vibration.

Machinery health monitoring: See Condition monitoring (CM).

Mean-Time-Between-Failure (MTBF): A measurement of reliability for repairable items: The mean number of life units during which all parts of the item perform within their specified limits, during a particular measurement interval under stated conditions.

Mean-Time-To-Failure (MTF): A basic measure of reliability for non-repairable items: The total number of life units of an item divided by the total number of failures within that population, during a particular measurement interval under stated conditions.

Orders: In rotating machines, orders are multiples or harmonics of the running speed (or associated reference component). 

Pitch: Rotation in the plane of forward motion, about the left-right axis. 

Radial: One of the three vibration axes (Radial, Tangential and Axial), the radial plane represents the direction from the transducer to the center of the shaft on rotating equipment. For typical horizontal machines, Radial equals the vertical axis.  For Horizontal machines Radial refers the Horizontal axis to which the accelerometer is attached.

Repeatability: The maximum deviation from the mean of corresponding data points taken under identical conditions. The maximum difference in output for identically-repeated stimuli when there is no change in other test conditions. 

Replication: Testing that reproduces a specified desired history.

Resolution: The smallest input change that produces a detectable change in an instrument's output. 

Root cause analysis: Determining what actually caused a failure.

Running Speed: The speed, usually expressed in revolutions per minute (rpm), at which a rotating machine runs. It may also be expressed in Hz by dividing rpm by 60.

Sensitivity: The ratio between electrical signal (output) and mechanical quantity (input).

Solid-state sensor: Sensor with no moving parts.

Tangential: One of the three vibration axes (Radial, Tangential and Axial), the tangential plane is positioned 90 degrees to the Radial plane, running tangent to the drive shaft.  For typical horizontal machines, tangential equals the horizontal axis.  For typical vertical machines tangential equals the second horizontal axis perpendicular to the mounting of the accelerometer.

Unbalance: Unequal mass distribution on a rotor. The mass centerline does not coincide with the rotation or geometric centerline. Also known as imbalance.

Velocity: Velocity is the rate of change in position, measured in distance per unit of time. When measuring vibration signals, velocity also represents the rate of change in displacement and is expressed in inches (in) or millimeters (mm) per second.

Vibration: Mechanical motion around an equilibrium reference point.

 

*For more information on the Fluke 810 Vibration Tester, visit http://www.fluke.com/machinehealth

About the Author

 

Steve Glad is a writer with Structured Information (http://www.strucinfo.com/) in

Arlington, MA. He frequently writes about industrial technology topics.

 

 

 

 

 

 

 

 

 

Arlington, MA). He frequently writes about industrial technology topics.

does the size of the harmonic balancer matter?

i was told that i have a 350 because the balancer is about an inch thick and the 305 is about 7/8in. i was just told that my 1 inch thick balancer is on a 305 because the numbers on the block start with c7a170813...help!

You can NOT decode an engine by the damper size. If you want to know for sure what engine you have, you must look up the sufix code (on pass side, in front of head, on pad close to intake), and the casting # (driver's side rear, on flange where trans bolts up to).. Then go to www.mortec.com and look up the #'s

Now on your "balancer". The right name for it is a harmonic damper. On internal balanced engine such as the chevy small block 262, 267, 265, 283, 302, 305, 307, 327, 350... The damper don't balance a single thing.. All it does is damping the harmonics (harmonics is waves.. Think of hitting a tuning fork and it breaking glass a few feet away.)

On the SBC 400, and the old way of making a 383 stroker. They use an external balance. The damper and flexplate/flywheel is balanced with the crank.

Ok now after the lession, I'll answer your question.. No the size does not matter. There's been a long debate in the high performance world about dampers.. What's better.. Small to save weight or large to dampen more harmonics. Myself I go for the weight savings and never had a prob.

On most of the SBC engines I build I use a small 6.00" or 6.75" dia. x .5" or .75" thick

Now the one thing to keep in mind though is the timing marks.. GM changed the marks from 12:00 postion to 1:00. So check to make sure your damper and timing tab is a match, so your timings marks won't be off. It's a pain tryying to set timing on an engine with a mis matched damper and timing tab..

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