It stores important information about the device. The signal conditioner reads the information about the sensor and automatically sets up the proper gain, scaling, engineering units, and other sensor settings. Engineers who use a lot of sensors find TEDS technology to be a huge time-saver when setting up a large-scale test. TEDS automation can also prevent human error. The sensors can be mounted in different ways.
The bandwidth of the sensor is especially sensitive to the way it is mounted. The method of mounting an accelerometer to the measuring point is one of the most critical factors in obtaining accurate results from practical vibration measurements. Sloppy mounting results in a reduction in the mounted resonant frequency, which can severely limit the useful frequency range of the accelerometer.
A quick and dirty solution is also to hold down the sensor with a hand on a rod. This is useful for some places which are hard to reach, but the bandwidth will be cut to 1 - 2 kHz.
The accelerometer should be mounted in a way that the desired measuring direction coincides with its main sensitivity axis. Some of the key vibration measurement applications of accelerometers are mentioned in the preceding sections. Here is a brief summary, plus some additional information. Below are just some of the typical vibration analysis applications that accelerometers are used for.
Order analysis is a tool to determine the operating condition of the rotating machines such as resonances, stable operation points, determining a cause of vibrations.
DewesoftX order analysis display. Order analysis solution page. Order analysis brochure. Order analysis: The ultimate guide.
Mechanical shock pulses are often analyzed in terms of their shock response spectrum SRS. SRS assumes that the shock pulse is applied as a base input to an array of independent single-degree-of-freedom SDOF systems. SDOF system assumes that each system has its own natural frequency. DewesoftX SRS screen. Shock Response Spectrum Solution Page. This allows the engineer to perform a deep evaluation of the structural properties of a large number of channels in real-time.
Sine processing testing with Dewesoft. Octave analysis is an indispensable tool for sound measurement as well as predictive maintenance and monitoring due to its logarithmic frequency axis.
In this case, microphones are used to capture sound. It is mentioned here because octave analysis is often done in conjunction with tests also involving accelerometers, such as shock and vibration testing, and more. Octave band analysis inside Dewesoft X data acquisition software. Octave analysis solution page. Octave analysis software manual. FFT spectrum analysis is an essential tool for engineers working in the shock and vibration domain.
Looking deeper into the response of an object under test to frequency and amplitude stimuli is critical to system design and improvement.
Systems used for FFT and frequency analysis needs advanced cursor functions, high freely selectable line resolution, flexible averaging, and advanced functions for in-depth frequency analysis. The Dewesoft system provides all of this and more:. FFT analyzer solution page. Dewesoft FFT analyzer brochure. FFT analyzer software manual.
Torsional vibrations can be a source of failure on rotating shafts. This is why rotational and torsional vibration analysis is so critical. DewesoftX rotational and torsional vibration screen. The Dewesoft rotational and torsional vibration analysis module combined with the order tracking analysis module is a perfect tool for troubleshooting shafts, crankshafts, gears in automotive, industrial or power-generation applications. Torsional and Rotational Vibration Analysis Page.
The human body and whole-body vibration measure the effect of vibration on the human body. The extracted parameters allow the simple assessment of the injuries risk for workers, exposed to constant vibration. Imagine the vibrations being induced into the human operator of jackhammers and similar tools. It is critical to test these tools for the health and safety of human operators. Balanced rotors are essential for the smooth operation of rotating machinery.
Unbalance will create high vibrations, reducing machine life and causing material defects. Dewesoft rotor balancing solution. Dewesoft's single- and dual-plane balancing solution works in both the static and dynamic modes. It is designed to help engineers eliminate unbalance on-site, reducing downtime, and saving money. Rotor balancing solution page. Modal testing and modal analysis are s indispensable tools for determining the natural frequencies and mode shapes of structures.
Modal analysis application with Dewesoft systems. DewesoftX modal analysis screen. Engineers can Import standard geometry files, or draw their own, for real-time visualization and animation of the structure under test. Modal testing and modal analysis solution page. Modal testing and modal analysis brochure. Modal testing and analysis: The ultimate guide. Accelerometers can be used to measure real-world vibrations, of course.
But what if we want to test how an object reacts to various frequencies and amplitudes? Should we wait for years until every possibility has been seen from real-world experiences?
Shakers are powerful tools for the shock and vibration testing world. Millions of accelerometers are affixed to objects under test and the shaker itself to model these results. Dewesoft offers a variety of shakers: permanent magnet, modal, and inertial. See the previous section for details. While a shaker is designed to excite a single frequency, impact hammers aka modal hammers are intended to excite a broad range of frequencies in an object under test.
In a typical scenario, a structure is fitted with accelerometers at key locations. Then the operator strikes the structure at one or more locations with the impact hammer. The impact hammer has an accelerometer built into it which provides a known value to the measuring system, so we know exactly for the force that was applied.
A Dewesoft system with a connected modal hammer for excitation and accelerometers to measure the response. Impact hammers normally have interchangeable tips that can be attached to the impact head itself. Tips are made with different hardness levels, so we can strike the structure with various harnesses, from very soft and spongy to extremely hard and unforgiving. These impulses will excite the response of the structure in different ways, providing new insight into the structure.
You can learn more about Dewesoft modal testing with an impact hammer in this short video presentation:. This is not to include every single maker in the world, because there are hundreds of them. But there are several major suppliers of accelerometers that engineers are well familiar with:.
SIRUS data acquisition systems offer high-end measurement modules for basically any type of accelerometer connection. There are several different modules available that are individually described below. This allows our DAQ modules to achieve an astonishing dB of dynamic range in the time and frequency domains. The inputs can also be used as plain voltage inputs software selectable , so you could also use charge sensors if you have separate charge amplifiers, as well as piezoresistive or capacitive sensors if you have external signal conditioning for them.
It can be powered straight from the USB connection, for example, a laptop. It is pre-configured with four high dynamic analog inputs, each of which features dual sigma-delta ADCs with kHz per channel sampling rate and up to dB dynamic range. Connecting to your computer via a locking USB connector, it features eight universal analog inputs.
Dewesoft offers a variety of popular accelerometers that are perfectly suited to Dewesoft hardware and software. These accelerometers are equipped with a TEDS smart sensor interface that allows Dewesoft X DAQ software to automatically detect the sensor and set the correct scaling, eliminating human error and making the system set up fast and easy. All Dewesoft vibration sensors are fully compatible with the Dewesoft vibration shaker line. Model I1AIG-1 is a miniature accelerometer intended for the measurement of higher vibration up to g.
Typical Dewesoft Accelerometer. Case isolated sensors can also be used with non-isolated amplifiers without worrying about ground loops. I3TIG-1 is a standard triaxial sensor with a 50 g range. I1TIG-1 is a single axis accelerometer that can measure up to g. Typical Dewesoft industrial accelerometer. Complementary to vibration sensors, the IHN-1 modal hammer with up to N range is a perfect fit for modal analysis applications using Dewesoft software.
Our modal hammer is equipped with a TEDS smart sensor interface. Dewesoft X software automatically detects the sensor and sets correct scaling. Measuring Shock and Vibration with Accelerometer Sensors Jan Written by Grant Maloy Smith , the data acquisition expert In this article we will discuss how we can measure shock and vibration with accelerometer sensors, with enough detail so that you will: See which accelerometers are available today Learn the basic types of accelerometers available and how they are used Understand how accelerometers can be interfaced with your DAQ system Are you ready to get started?
Jump to a section Introduction What is Vibration? What Is an Accelerometer? Share this article:. Related Articles. Read more ». Well-suited to velocity and displacement applications because their DC outputs avoid integration and double integration errors better than AC output sensors. Fixed sensitivity regardless of cable length and cable quality A higher output signal means less noise Longer cables are no problem Requires a less expensive IEPE signal conditioner in the measurement system Excellent dynamic response Low-impedance output can be transmitted over long cables Withstands better harsh conditions like dirt and humidity Intrinsic self-test function.
Can measure both AC and DC acceleration Can be made very small and inexpensively with somewhat limited accuracy. Lack of high bandwidth of piezoelectric charge and IEPE sensors. Lack of high operating shock and temperature range of charge sensors in particular.
Well-suited to velocity and displacement applications because their DC outputs avoid integration and double integration errors better than AC output sensors It can measure down to 0 Hz It can measure a static angle Differential output. Not well suited for dynamic applications Limited temperature operating range due to internal electronics Upper bandwidth limited to low kHz range. Limited temperature operating range due to internal electronics Upper bandwidth limited to low kHz range Amplitude range limited to g.
This service is more advanced with JavaScript available. Advertisement Hide. Authors Authors and affiliations Sarita Kumari. Conference paper First Online: 23 April This is a preview of subscription content, log in to check access. Chen J, Hu X, Xu L Research of distributed curvature modal sensors with optical fiber on vibration measurement for thin structures.
In: The 3rd intetnational conference on innovative computing information and control, Google Scholar. Zhou H, Qiu Y A simple mathematical model of a vehicle with seat and occupant for studying the effect of vehicle dynamic parameters on ride comfort. Wada A, Tanaka S, Takahashi N Multipoint vibration sensing using fiber bragg gratings and current-modulated laser diodes.
J Lightwave Technol 34 19 Google Scholar. Maruthi GS, Hegde V Mathematical analysis of unbalanced magnetic pull and detection of mixed air gap eccentricity in induction motor by vibration analysis using MEMS accelerometer.
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