Vibration/Bump/Shock Test Systems

Electro-Dynamic Shakers

DESPL manufacturers and supplies a wide range of vibration test systems that are both cost effective and easy to use. These tools empower the maintenance professionals to detect and evaluate machine vibrations easily.

DESPL are capable of offering an array of customerised solutions that can meet customer’s every need and requirement. Using high-tech technologies, they supply vibration test tools that are eco-friendly and produce low noise. The eco-technology enables you to reduce carbon emissions and electricity consumption.

The range of Vibration Test Systems includes the following models:

• DEV 125 (50 TO 100 kgf)
• DEV 140 (200 TO 300 kgf)
• DEV 180 (400 to 600kgf)
• DEV 240 (1,000 to 1,500kgf)
• DEV 300 (2,000 to2,500 kgf)
• DEV 360 (3,000 to 3,500 kgf)
• DEV 440 (4,000 to 6,000 kgf)
• DEV 500 (8,500 to 10,000 kgf)
• DEV 590 (16,000 to 20,000 kgf)

Product Range:

• Equipment
• USB Vibration Controller
• Vibration Test Machine
• Digita Switching Power Amplifier
• Shock Vibration Test Test Systems
• Head Expanders
• Slip Tables
• Vertical Load Supports

Shock Systems

The Free Fall Shock system is designed to produce classical shock wave shapes by dropping a platform supported on rods and bearings. The platform drop height is pre-adjustable for shock pulse repeatability. Peak Acceleration levels are based on the drop height while time duration is a function of the programprovided, elastomer pads for half-sine, lead pellets for saw-tooth and pneumatic cylinders for square and trapezoidal wave pulses.

Each system is supplied with brakes to prevent repeated impacts and incorporates a heavy steel reaction mass mounted on springs with isolators/dampers to isolate the shock from the floor and which will not deteriorate under repeated bumps. The structure is supported on four passive air springs to isolate the bump pulses from the floor as it is designed for very high ‘g’.

The test item shall be mounted to a solid AI/MS carriage with steel inserts on the top surface. The platform is supported and guided by the lifting and driving piston rods.

The PC based hardware and software is used for transfer, storing, retrieval and generating graphs/waveforms. Computer compatible for the control of the bump test system like pneumatics, falling of platform and hydraulic brakes is be provided.

Technical Specifications
Pay Load Capacity	Up to 1000 Kgs
Table Size of the unit under test	As per customer requirements (Maximum: 1500 mm x 1500 mm)
Test Pulses (ms)	Half-sine, 3ms, 9ms, 11ms,15ms, 18ms, 20ms, 30ms, 40ms (Required pads shall be provided)
“g” value	10 ‘g’ to 500 ‘g’ Settable (Tolerance ±10%)
Shock Rate	1-10 shocks per minute (settable)
Shock Test Systems Details	Complete details of system with respect to principle of operation, construction of the bump system including the major sub-systems like mounting provision for the unit under test. All accessories required to perform the tests shall be clearly indicated by the end user.
Control Systems	State of the art controlling and programming/setting of the following parameters shall be provided with digital and graphical indication.   Height, No of shocks with an elapsed counter. Digital and graphical indication of the waveform, “g” values and pulse width.

System Features:

• PC Based Control
• Table Extender
• Custom Hole Pattern
• Mounting Test Fixtures
• Monitoring Instruments

Bump Systems

The Bump system is used to test the integrity and rigidity of objects under the simulation of various road/field transport conditions.

The Bump system incorporates a rigid steel structure to sustain the force of up to 1000 kg for a half sine.

The mounting platform lifts vertically up to the desired impact acceleration through a cam arrangement and drops freely onto the rubber pads which gives the desired pulse shape.

The desired acceleration depends on the free fall height of the platform which is factory set. The duration of the half sine pulse shape depends on the hardness and thickness of the rubber pads.

The mounting platform has a grid pattern of 100 mm x 100 mm threaded M10/M12 holes to mount the device under test.

An AC motor along with a speed reducer gearbox are used to achieve the desired bump rate of 1 to 3 bumps per second. The three-phase motor also incorporates safety protection in the form of Over Load, Under Voltage and Over Current protection.

The PC based hardware and software is used for transfer, storing, retrieval and generating graphs/waveforms. 

Technical Specifications
Pay Load Capacity	Up to 2,000 Kgs
Table Size	As per customer requirements (Maximum: 1500 mm x 1500 mm)
Bump Rate	Adjustable 1 to 3 bumps / sec
Bump Rate Counter	Digital
Acceleration	Up to 100 ‘g’ (±10%)
Pulse Shape	Half-sine
Pulse Duration	Adjustable 2 to 18 milliseconds (±10%)
Control Panel	Preset mechanism with on off switch
Calibration	Traceabe calibration certificate will be provided
Mains Supply	415V±10% AC, 50 Hz, 3 Phase

System Features:

• PC Based Control
• Monitoring Instruments
• Complies with various international standards

Centrifuge Test Systems

 

Centrifuge Acceleration test systems (also known as a linear acceleration test system) are used to subject a test object to a defined force. A predefined centrifugal force is exerted on a test object when it is placed inside a rotary platform at a certain radial distance.

Centrifugal test systems are used to analyze the mechanical behavior of various components and assemblies,when subjected to linear acceleration. It is widely used in the avionics and military hardware testing, satellite component testing, R&D laboratories, system qualification testing, product and reliability development, stress screening, etc. Centrifuge tests are performed in accordance with the relevant ISO, IEC, JSS 55555, MIL-STD and other international standards.

The centrifuge test system has a robust structure that consists of an outer enclosure from a safety point of view to withstand centrifugal forces acting on the test object. It consists of a rotating platform which can accommodate a wide variety of payloads in various sizes and loads at a required radial distance from the centre to achieve the desired acceleration.

The system is driven by AC/DC drive motors and the speed is varied by the IGBT based PWM type AC/DC drive with instrumentation system having built in digital closed loop control.

Electrical/electronic data transfer connections are available through various terminals for actual working conditions and test environments.

The overall structure is made from heavy gauge mild steel. The lower half of the structure consists of a hollow cabinet containing the DC motor and the vertical rotating shaft. The upper half is an octagon shape where the rectangular platform is coupled to the top end of the vertical shaft.

 

Parameters	Models
	DCFG-50-30	DCFG-100-70	DCFG-100-75	DCFG-200-125	DCFG-20,000-13	DCFG-40,000-10	DCFG-80,000-10
Acceleration range	1-50 ‘g’	1-100 ‘g’	1-100 ‘g’	1-200 ‘g’	500-20,000 ‘g’	500-40,000 ‘g’	500-80,000 ‘g’
Nominal Radius	300 mm	700 mm	750 mm	1250 mm	130 mm	80 to 100 mm	80 to 100 mm
Platform Radius Range	250-350 mm	500-900 mm	550-950 mm	750-1750 mm	–	–	–
Payload Size	100 mm3	400 mm3	400 mm3	1000 mm3	–	–	–
Payload Capacity	50 kg	50 kg	100 kg	250 kg	1 kg	0.5 kg	0.4 kg
Test Direction	x, y, z	x, y, z	x, y, z	x, y, z	x, y, z (6 directions)	x, y, z (6 directions)	x, y, z (6 directions)
Max Speed	550 rpm	350 rpm	350 rpm	400 rpm	1200 rpm	19,000 rpm	27,000 rpm
Speed Resolution	0.5 rpm	0.5 rpm	0.5 rpm	0.5 rpm	5%	5%	5%
Dimensions (approx.)	Dia: 800 mm Height: 800 mm	Dia: 2,000 mm Height: 2,000 mm	Dia: 2,000 mm Height: 2,000 mm	Dia: 3,600 mm Height: 2,000 mm	800 mm x 800 mm x 850 mm
Weight (approx.)	1,500 kg	2,500 kg	3,000 kg	5,000 kg	2,400 kg	1,800 kg	1,800 kg
Online Connections (Through slip rings)	Electrical, Electronic, Data transfer, RF, Pneumatic, Hydraulic connections are available				–	–	–
Utilities Required	415V ±10%, 3 phase, 50 Hz AC				–	–	–
Safety Interlocks	Mains input, over and under voltage, phase fail, door lock, imbalance vibration

 

Vibration controller

 

Vibration controller is suitable for both electro-dynamic and servo-hydaulic shakers, it drives shaker to simulate the realistic vibrations under laboratory environment. It is a full featured controller, making it possible for users to take all kinds of testing to eliminate the destructive effects for products that caused by vibrations.

Superb Performance and Reliability

It features superior performance in both R&D and production environments. It is designed based on distributed processing structure with multi-DSPs technology, low noise hardware design, 32-bit float point digital filtering, 24-bit ADC/DAC resolution, and advanced adaptive control algorithms. Its real PC-independent structure ensures that all commands bring immediate control response without degrading the performance of the testing system. DSP controlled digital synthesis and filtering provides fast loop times for quick test load equalization and enhanced safety.

Powerful Versatility and compatibility

This controller supplies powerful compatibility to electro-dynamic shakers. And it offers a comprehensive and flexible suite of control software packages with compliance of different operating system. You can customize your own test application without expensive hardware upgrades, change of your computer and operating system. This also serves engineers flexible multi-users supervision and management.

Maximized Convenience

Its powerful automation wizard makes repetitive and boring tasks simple, allowing you to run complex tests with a single keystroke. Its setup wizard and user-friendly graphical interface simplify setup for coordinated environmental testing and reduce test time. Also “One-click” automatic report generation eliminates the tedium of creating test documentations.

USB2.0 Connectivity

Adopted USB2.0 connectivity with superior speed and convenience. When you connect controller to your computer, it will be identified as a true USB2.0 device. You will enjoy this connectivity by easy plug and play, high speed and easy to use.

Enhanced test Safety

Safety checks and interlocks ensure the safety of the personnel, test article, and shaker, such as automatic detection of input overload, open loop and loss of signal, etc. Moreover, you can use a built-in hardware “ABORT” button to stop the test in case of emergency.

 

Specification

• Up to 64 synchronized input channels
• 24-bit ADC/DAC resolution
• 32-bit floating-point DSP computation
• Charge, Voltage, ICP, TEDS (Optional)
• 100dB control dynamic range
• Up to 3200 lines resolution in random(6400 lines optional)

AC Power – 88-264V, 47-53Hz Auto sensing.
Operating Temperature – 0 to 50°C.
Humidity – 20 to 90% RH.

PC Connection

Operating System – Win 2000/NT/XP/Vista/Win 7.
Connectivity – USB 2.0/3.0.

Horizontal Slip Table

Principle

The slip table works on the principle of an oil film maintained between the granite surface and the slip plate supported by low/high pressure oil bearings to eliminate overturning moments. An oil film is automatically created through a closed loop system, when the oil pump coupled with the motor is started.

These are ideally suited and designed for testing of medium and heavy loads and voluminous specimens/objects in x, y & z directions. The bearings are designed to restrain pitch, roll and yaw moments. Ambient and combined environment (vibration + thermal) testing are also supported.

Combo Base

Slip tables can be used in a standalone position with the optional seismic base or integrated on a common base with a vibration shaker. The electro-dynamic shaker can be rotated to the vertical position for one axis and then rotated to the horizontal position where it is connected to a horizontal slip plate through a drive bar/coupling for the other two test axis.

Construction

The discharge of hydraulic oil is supplied by a hydraulic pump for supplying oil to the bearings and for the formation of oil fil on the granite block. A pressure gauge is provided for reference.

The slip table platform is made from Mg and has replaceable stainless-steel nut inserts. The Slip Table structure is finished in a gloss and metallic coating of polyurethane paint with various contours.

Head Expanders

Application

To extend the capabilities of the Electro-dynamic shakers we offer a wide range of vertical attachments called “Head Expanders” which are required for mounting and testing large test sampleswhich cannot be directly mounted onto the shaker head in the vertical axis (Z axis).

We have the full capability to design and manufacture head expanders and fixtures to meet your application and requirement needs.

Features

All head expanders are designed using FEA to determine the natural frequency and optimize the performance of the shaker. High quality construction guarantees the reliability of the vibration test system.

The head expander consists of a magnesium cast table surface which is directly bolted onto the shaker head. We offer a wide range of sizes in both round and figural shapes with customized hole patterns and available for any size armature.

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Mechanical Shaker Table

The Mechanical Shaker Table is a low-cost system designed to perform various vibration tests.

Its constructed from a rigid steel structure to sustain the forces exerted on a load up to 100 kg for between 0.5‘g’to 20’g’ and with a Sine waveshape with a variable frequency range from 1 to 60 Hz. The mounting platform lifts vertically up to the desired impact acceleration through a cam arrangement which also gives it the desired acceleration. The motor is driven by an AC drive which has built in protection and controls.

The moving platform is a grid pattern of 100 mm x 100 mm with threaded M10 stainless-steel nut inserts.

The Mechanical Shaker Table is supplied with a vibration meter for measuring vibration parameters like acceleration, velocity and displacement.