Technical Terms for EV203H Vibration Testing System

EV203H vibration testing system is the shaker system for WEW-AG-002 agree chamber, It is based on the principle that the current-carrying conductor moves under the force of the magnetic field. The main features for : double magnetic circuit field magnetic structure, new technology voice coil, voice coil support system using cantilever bracket and air spring support. The high-efficiency class D power amplifier is provided with system protection by the built-in fast processor. The cooling mode is forced air cooling.

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Quick Installation Guide for EV203H Vibration Testing System

Acceleration : The time ratio of speed change.

Speed : Speed is the time ratio of displacement change.

Displacement : Displacement is the change of the position of the table or object from the balanced position to the unbalanced position.

Note : The above three physical quantities are divided into amplitude (amplitude), average value, and root mean square value (effective value) according to different purposes. Sinusoidal vibration mostly uses amplitude, but displacement uses double amplitude (PP), and The root mean square value is mostly used for random vibration.

Exciting Force : The output of the vibration system.

Vibration : Vibration is a reciprocating motion, or the reciprocating movement of a particle about a specific reference point. The measurement of vibration is often expressed in terms of acceleration.

Sinusoidal Vibration : Sinusoidal vibration is a vibration described by a sine time function.

Random Vibration : Random vibration whose instantaneous value cannot be predetermined at any given moment in the future. Random vibration includes many frequencies at the same time. In random vibration, the amplitude of acceleration is any time or time zone different.

Shock : A transient excitation of the system. There are different types of shock pulses used today. It includes classic shock, collision, shock response spectrum, and seismic shock.

Resonance : Any small change in the excitation frequency will cause the system to respond to falling vibrations, called resonance. The shape of the response curve is measured according to the “Q value” of resonance.

Fixture : The device used to clamp the test piece on the vibration table, including a simple converter metal plate to a special-shaped support. Fixtures that do not meet the design requirements will limit the performance of the vibration test system.

Q Value : Q value measures the sharpness of resonance of a vibration system (including mechanical and electrical). In a mechanical system, this value is equal to the resonance frequency divided by the resonance bandwidth.

Active System : The main part is called the moving coil (including the table, skeleton and driving coil). The term “active system” is used by the system operator to include supporting accessories on the moving coil. The moving coil provides a mounting plane for the fixture and test piece.

Frequency Response Characteristics : The characteristics of the system’s response in a certain frequency range, it will stably transmit vibration. What is transmitted may be a force, displacement, velocity, or acceleration. The minimum natural frequency of a good fixture must be higher than the frequency required for the test.

Drive Coil : The AC coil wound around the bottom of the component is driven by a power amplifier. The material used for winding the coil is copper or aluminum.

Tabletop Suspension System : the components that elastically support and guide the tabletop.

Moving Coil Connection : A wire that transmits current to the drive coil, one of which is used to ground the moving coil.

Cooling Fan : It has a high negative pressure and a large flow rate, and it is a device that extracts the heat in the vibration table body. Upper excitation coil: The DC coil installed on the top of the magnetic circuit of the vibration table forms a strong magnetic flux in the air gap. This magnetic flux is used to generate the excitation force of the vibration table.

Lower Excitation Coil : The DC coil installed at the lower part of the magnetic circuit of the vibration table forms a strong magnetic flux in the air gap. This magnetic flux is used to generate the excitation force of the vibration table.

Degaussing Coil : Generates a magnetic field. In order to eliminate the leakage of the excitation coil, the DC coil reduces the stray magnetic flux on the moving coil table (optional items for the vibration table).

Air Gap : The area where the drive coil is located, where there is a high magnetic flux density. The air gap is usually only 10mm wide or smaller, depending on the vibration force of the shaker.

Magnetic Flux Path : The path of the magnetic field in the shaker. It must be noted that not all magnetic flux will pass through the gap between iron and air. Some magnetic flux, called scattered magnetism, runs in the air outside the shaker. The demagnetization coil is used to reduce the magnetic emission on the moving coil table.

Countertop Screw Hole : The mounting connection hole of the jig or test piece is a hexagonal nut tapped into the countertop with a thread or a threaded bush inserted into the clamp. The moving coil itself is made of magnesium alloy or aluminum-magnesium alloy. Repeated assembly and disassembly of the test piece by the fastening screw that fixes the test piece directly on the table of the aluminum-magnesium alloy will reduce the life of the moving coil. Therefore, a dedicated mesa screw hole is provided on the mesa.

Table Body : Magnetic steel structure. Basic composition: central magnetic pole, magnetic cylinder body, magnetic cylinder head, magnetic cylinder bottom, etc.

Magnetic Cylinder Body : The steel body part that provides a magnetic circuit for the magnetic field, the upper and lower parts are equipped with excitation coils, and the middle part is welded with an outer short-circuit ring.

Magnetic Cylinder Cover : A steel body part that provides a magnetic circuit for the magnetic field, a guide system is installed on the upper part, a central through-hole is a part where the central magnetic pole passes out, and a bolt that compresses the upper excitation coil is installed.

Magnetic Cylinder Bottom : The steel body part that provides the magnetic circuit for the magnetic field, the central magnetic pole is installed in the middle, the lower part is equipped with a ventilation hood, the central through hole is equipped with a bearing air chamber, and bolts for pressing the lower excitation coil are installed.

Central Magnetic Pole : Forming a magnetic circuit with strong magnetic flux, an inner short-circuit ring is welded in the middle, and a working air gap is formed with the outer short-circuit ring of the magnetic cylinder body. A slot of equal width is opened to provide space for the moving coil to move up and down.

Lower Guide Mechanism : It is the axial structure in the vibration table, which is used to ensure the axial guidance of the vibration table when the moving coil moves up and down, and provide guarantee for the vibration table to achieve good indicators.

Lower Guide Post : The shaft connected to the moving coil provides linear guidance performance and vertical axial rigidity for the moving parts.

Upper Cover Ring : The upper cover of the shaker to protect the safety of the operator and prevent debris from entering the shaker.

Dust-Proof Film : The rubber piece between the moving coil and the upper cover ring, the rubber seal is fixed on the moving coil table to prevent debris from entering the vibration table.

Ventilation Hood : The end cover installed at the bottom of the vibration table is used to prevent foreign debris from entering the vibration table and provide a closed channel for the fan.

Load Support Mechanism : The mechanism used to support the vibrating table moving system, placed under the moving coil, according to the weight of the load, using the height indicator as a reference to increase or decrease the air pressure in the air chamber.

Height Indicator : A measuring wedge used to measure whether the moving coil table is in a balanced position.

Base : A member that supports the vibration table, there are two structures, one is a vertical support structure, and the other is a vertical and horizontal joint support structure.

Trunnion : The axis of rotation of the vibrating table, installed at the center of gravity of the vibrating table, used to rotate the vibrating table. The shaking table can rotate 90º.

Connector : The device that connects the vibrating table to the slide table, sometimes called the drive row.

Water Platform : The shaking table is used to install fixtures and test pieces when performing horizontal vibration. The water platform has different sizes and shapes, and the horizontal slide table is connected to the vibrating table surface through a connecting head.

Granite Slab : Natural granite, the surface is smooth and smooth, it is the contact surface of the horizontal slide, and an oil film is formed on the surface, so that the friction of the horizontal slide during movement is very small.

Torsion Spring : Suspension system support, there are two metals connected by rubber, one end is connected to the vibration table body, and the other end is connected to the movable system.Used as part of the suspension stiffness and support of mobile systems.

Lifting Ring : Installed on both sides of the table body, used to hoist the vibration table and slide table. Guide shaft: the connecting piece of the magnetic cylinder body and the machine base, which plays a guiding role when the vibration isolation mechanism moves the magnetic cylinder body up and down.

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