RMC Engineering

Accelerometers

admin — Sat, 02 Feb 2013 09:57:47 +0000

Piezo-electric accelerometers based on ferro electric ceramics first surfaced in the late 40′s as means of collecting data on the dynamic behaviour of airframes and a variety of military and avionic hardware, supplanting the heavier, less robust velocity transducer. Early devices comprised a piezo-ceramic disc sandwiched between a reaction mass and a cylindrical base (the means of attachment to the test object), and this manner of construction features in several manufacturers products today.

However the art has moved on; disadvantages inherent in this compression disc design, namely high strain sensitivity and cross axis error, preclude their use for many applications and have directly led to several innovations whereby the acceleration/charge conversion is accomplished by means of a shear couple applied to a piezo-ceramic plate or tube.

Specifically, our KONIC design (UK pat 1507251), comprising a truncated hollow piezo-ceramic cone, spigot, and concentric reaction mass, provides virtual isolation of the sensing element from mounting induced strain, with the further benefit of minimal cross axis error deriving from its radial symmetry.

In addition, the KONIC sensing element is mechanically preloaded, temperature constraint imposed by use of adhesives is eliminated. The various configerations outlined above are clarified in fig 1.

KONIC accelerometers are produced in sizes from 1.5gm, weight, 2pC/g sensitivity upwards, maximum 90gm., 300pC/g.

Piezo-ceramic shear plate technology is employed at the periphery of the KONIC range as offering miniaturisation advantages, and sensitivity enhancement by virtue of parallel plate construction.

We have a wide range of industrial accelerometers (vibration sensors).

Mono-Axial Charge Output

Mono-Axial IEPE

Tri-Axial Charge Output

Tri-Axial IEPE

Mono-Axial Industrial

Impact Hammers

admin — Sat, 02 Feb 2013 09:56:43 +0000

The IH range of impact hammers offer a range of 4 hammers ranging from 2000N to 50000N. All with IEPE integrated electronics force transducers for simple connection direct to analysis front ends or to voltage source instrumentation.

The IH series IEPE impact hammer range features a rugged force sensor that is integrated into the hammers striking surface.The force sensor serves to provide a measurement of the amplitude of the energy stimulus that is imparted to a test object. A variety of tips supplied with each hammer permit the energy content of the force impulse to be tailored to suit the requirements of the item under test. Using multi-channel data acquisition and analysis software, the test engineer is able to ascertain a variety of mechanical properties leading to an understanding of an objects structural behaviour. Items analysed can include resonance detection, mode shapes, transfer characteristics, and structural health, such as crack and fatigue detection.

IH series impact hammers can be applied for Structure Health Testing, Resonance Determination, Modal Analysis etc.used in association with DJB’s wide range of accelerometers full response data can be captured during impact testing.

All IH Impact Hammers come in their own case with cabels and tips.

References

admin — Tue, 25 Dec 2012 14:01:13 +0000

Some of our references:

ROTOTEST Energy

admin — Wed, 05 Sep 2012 13:34:59 +0000

Dynamic & Regenerative (4Q Operation)
Full drive cycle capability with inertia simulation
Cutting edge test system for hybrid / electric car development (2WD/4WD)
Installs in less than a day
No infrastructural requirements

The ROTOTEST Energy™ electrical chassis dynamometer is in reality a supreme four- quadrant capable engine dynamometer fitted to each drive wheel hub. The ROTOTEST Energy™ electrical chassis dynamometer revolutionizes the way complete vehicle testing is performed by allowing more to be done in less time and with less resources. By utilizing a state-of-the-art 4Q control system and the ROTOTEST Active Inertia™ technology the vehicle’s inertia (mass) is simulated electrically for true road conditions.

Example of simulation capabilities are standard driving cycles such as ECE/EG, US06, FTP75, etc. Another great advantage of the ROTOTEST chassis dynamometer is its mobility. The complete system can be transported to a new test site with a minimum of set-up time, and thereby maximizing availability and cost-effectiveness. The ROTOTEST Energy™ range is based on the technology of the industry recognized ROTOTEST VPA-RX™ / VPA-R™ range of dynamometers.

Unlike a traditional chassis dynamometer (roller type) the ROTOTEST dynamometer (hub type) is also an advanced true measurement™ instrument. This is accomplished by a front-end mounted torque transducer, a high resolution speed sensor and direct-coupling to the vehicle’s hubs. The patented ROTOTEST dynamometer concept is comparable to a “rolling road”, but is far superior in precision and test possibilities as there is no slip between hubs and dynamometer (normally experienced between wheels and rollers), low system inertia and thanks to the accurate measuring system that is independent of the absorption system.

ROTOTEST VPA-RX

admin — Wed, 05 Sep 2012 13:27:48 +0000

..

Flexible & Productive (1Q Operation)
Complete vehicle testing with engine dynamometer accuracy
Considerably more cost- effective than traditional test systems
Installs in less than an hour
No infrastructural requirements

The ROTOTEST VPA-RX™ chassis dynamometer revolutionizes the way complete vehicle testing is performed by transforming the traditional chassis dynamometer (using rollers) from a simple load absorber into a fully- fledged true measurement instrument. The patented ROTOTEST® dynamometer concept is comparable to a “rolling road”, but is far superior in precision and test possibilities as there is no slip between hubs and dynamometer (normally experienced between wheels and rollers), negligible system inertia and thanks to the accurate measuring system that is independent of the absorption system. Thanks to its portability the complete test system can be easily transported to a new test site and set up in minutes.

ROTOTEST VPA-RX™ chassis dynamometer – the multipurpose driveline testsystem for quality assurance, research & development.

Today’s automotive industry is subject to many regulations and requirements. Growing environmental demands and requirements for high performance, maximum energy efficiency, low noise and outstanding quality make extreme demands on test equipment. The ROTOTEST VPA-RX™ chassis dynamometer gives you the resources to evaluate these factors accurately and efficiently.

The ROTOTEST VPA-RX™ chassis dynamometer is in reality a supreme engine dynamometer fitted to each drive wheel, using a front-end mounted torque measuring load cell, a high resolution speed sensor and direct- coupling to the vehicle’s hubs. As a much valued instrument for auto manufacturers’ R&D departments around the world for more than a decade, the ROTOTEST VPA-RX™ chassis dynamometer has now been made available not only to R&D departments but also to aftermarket performance specialists and professional racing teams.

The chassis dynamometer is today used by most of the major car manufacturers and other renowned companies and institutions (e.g. General Motors, Renault, Volkswagen, …) in their development, quality assurance and research

Strain Gage

admin — Mon, 09 Jul 2012 15:50:08 +0000

Strain gages are sensing elements that electrically detect micro mechanical changes referred to as “strain.”

Metal

Mainly metal

Concrete, mortar, etc

Lumber, Plaster, Paper, etc

Various Materials

Composite Materials, Printed boards, Plastics

Metal, Plastics, Lumber and Rubber

Metal Bolts

Adhesives, Leadwire Cables

Other Accessories

Transducers

admin — Mon, 09 Jul 2012 15:45:04 +0000

Loadcells

Load cells convert weight, force, etc. to electrical signals. KYOWA strain-gage load cells are notable for simple structure, easy installation, high response and maintenance-free over long periods of usage.

Pressure Transducers

Pressure transducers convert liquid or gas pressures into electrical signals. They enable highly precise and stable pressure measurement for a long period of time.

Acceleration Transducers

Acceleration transducers convert the acceleration of running vehicle or the vibration of car body or machinery into electrical signals. Each model is compact and lightweight, and ensures superior static and dynamic characteristics.

Torque Transducers

Torque transducers convert torsion (surface shearing stress) corresponding to a torque of the shaft into electrical signals. Because a strain gage is used for the converting element, KYOWA torque transducer offers outstanding precision and stability.

Displacement Transducers

Displacement transducers are designed to measure relative displacement and/or absolute displacement from a steady point of structures by converting detected displacement into electrical signals. We can provide various models measure a wide range of displacement from 2mm up to 5m.

Civil Engineering Transducers

Data Acquisition Systems

admin — Mon, 09 Jul 2012 15:40:15 +0000

Data Loggers / Recorders / Analyzers

Data loggers record signals from strain gages and strain gage-type transducers. Capable of recording all types of phenomena from static to dynamic. In addition, units with an analysis function are also available.

Amplifiers

Amplifiers amplify the micro change volume from strain gages and transducers. Use of elements such as high-performance Ics, high-density circuits and the CST (Capacitance Self-Tracing) method ensure faithful responsiveness and stability.

Instrumentation Amplifiers

Instrumentation amplifiers can be connected with strain-gage transducers and enable to monitor various physical quantities such as weight, force, pressure, displacement, torque, etc. As they provide several output signals for control and determination, KYOWA instrumentation amplifiers are used in various industrial fields.

Automotive Test Equipment

admin — Mon, 09 Jul 2012 15:35:20 +0000

Automotive Performance Test

Combines all kinds of transducers for evaluation of factors such as automobile performance testing, safety checks and on-board comfort with on-board-type data recording devices to measure and analyze physical quantities including acceleration, load, force components, moment and oil pressure.

Component Test

Dummy-mounted transducers comprise all types such as load gages, force component indicators and accelerometers. In addition, types including impact force meters for barriers and seatbelt tensimeters are available. Data is recorded on a dedicated on-board shock-resistant measuring device.

Crash Test

SEMTECH ECOSTAR

admin — Wed, 06 Jun 2012 13:37:02 +0000

The SEMTECH ECOSTAR product suite comprises a range of individual, self-contained modules, each with a specific functionality, which may be operated as stand-alone analytical devices or as part of a fully integrated measurement package. Each module has been designed to maintain its high-grade analytical performance while operating under extreme testing environments with minimal space, weight and energy requirements. This powerful design approach offers optimum flexibility, performance and ease of use in multiple real-world applications and under harsh testing conditions. Whether used in the test-cell or in the field, SEMTECH ECOSTAR represents today’s best available commercial technology.

System Modules

SEMTECH-FEM
Fuel Economy Meter measures CO, CO₂, O₂ and live monitoring of fuel economy using the carbon balance method.
◊ SEMTECH-FEM

SEMTECH-NOx
Measures NO and NO₂ separately and simultaneously.
◊ SEMTECH-NOx

SEMTECH-FID
Measures THC using a flame ionization detector.
◊ SEMTECH-FID

SEMTECH-MPS
Provides micro-proportional sampling, enabling particulate measurements.
◊ SEMTECH-MPS

SEMTECH-PFS
Particulate Filter System with a new approach to the gravimetric method.
◊ SEMTECH-PFS

SEMTECH-CQCM
Carousel Quartz Crystal Microbalance measures particulate mass.
◊ SEMTECH-CQCM

SEMTECH-PDM
Power Distribution Module provides power for up to four SEMTECH ECOSTAR modules.
◊ SEMTECH-PDM