Questions tagged [vibration]

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4
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1answer
112 views

Why do vibration sensors use a negative voltage?

I've started looking at some industrial vibration monitoring sensors for a project and it seems like there's a number of brands that use negative outputs voltages. Many are eddy current sensors with ...
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0answers
30 views

Placing piezo disk in vibration sensor

I am designing a vibration sensor in enclosure to be placed on vertical surfaces, like windows, doors, etc. My first try was with ready made sw420 module, but looks like it is to sensitive for my ...
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0answers
26 views

What style of semi-permanent power connector for vibrating environment?

With the only constraint being that the connection is "easily" removable (e.g. not soldered, but common tools are fine), what style of power connectors work best for vibrating environments? ...
0
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1answer
334 views

using a vibration / noise sensor as edge finder in a CNC machine

I have a desktop CNC machine which has just the basic functionalities like controlling the speeds and position with a somewhat reasonable accuracy / precision. I also have an edge finder which I can ...
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0answers
93 views

PCB hanging upside down in its enclosure

Would this be a problem in a moderately high vibrations / shocks environment (passenger car interior) ? The screws are 1.8 mm thread diameter, 5 mm long, the PCB being some 90 x 60 mm with nothing ...
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1answer
77 views

Detecting a feather touch [closed]

New to the forum here, but I have a need to detect a feather touch. Is there any sensor that is recommended? This will be in a vibrating environment, so audio is probably out of the question. Is a ...
1
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2answers
124 views

Creating a vibration device based on bass in audio [closed]

First, I'll admit that I haven't done any real electrical engineering in years so I'm quite rusty. But here's a fun project to contemplate: I'm building a device that "rumbles" with the bass in the ...
1
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2answers
279 views

How to build a multi LED blink circuit triggered by vibration sensor?

I'm wondering how to build a module just like the ones that are in kids shoes that light up. I've taken a few of these out and would like to make my own circuit but I'm not sure if it is possible. I'...
0
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2answers
61 views

How do we measure capacitance by change in vibration

A capacitively based MEMS affinity glucose sensor. link to the IEEE paper, from where I've got this doubt. The gold electrodes are separated with some distance and the permalloy is vibrating with ...
0
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1answer
32 views

Vibe Table: Increase Peak Force Output?

I'm driving a small, benchtop vibe table (shaker) with two Crown DSI-1000 PA's, and also cleaning my signal with a DBX 231s EQ. Currently running the system at 6.8 GRMS, but I'm looking to increase my ...
2
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1answer
118 views

Quartz Clock Accuracy

Do the vibrations of aircraft engines (or any engine, for that matter) dilute the accuracy of a quartz clock? I haven't done any kind of research or hypothesis testing, though I believe that the ...
2
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2answers
102 views

Is it possible to generate different PWM Signals for same duty cycles(e.g. 50%)?

Let us expect we have a duty cycle of 50%. Is it possible to reach that duty cycle with different PWM Signals (waveform)? With different I mean variants in the number and lengths of the "active time". ...
0
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1answer
47 views

What are the implications on vibration measurement from decreasing Pulse-Width Modulation (PWM) frequency of a 9V electric motor?

What is the effect of a PWM (or other duty-cycle variation method) frequency change on the vibration of an electrical motor (9V, DC)? I plan to measure the (surface-) vibration with acceleration ...
0
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2answers
63 views

What are the methods to measure distribution transformer vibration in 0.5g range?

It may seem obvious to use widely available analog devices MEME accelerometer for measurement in range of 0.5g. I did thorough study on this and found out that MEMS sensors either doesn't work or ...
0
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2answers
581 views

SW-420 vibration sensor module getting stuck

I am experimenting with SW-420 vibration sensor modules I just got from China. The digital out pin is supposed to output HIGH when sensor detects vibration, and LOW, when at rest. There's an onboard ...
0
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2answers
90 views

A sensor which can measure the vibration of a material

I am planning on making a musical instrument where I require the conversion of vibration of a material to voltage. The idea is to make a percussion instrument where I hit a plate made of a certain ...
0
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1answer
183 views

Hardware Schematic For Connecting Vibration Sensor to MSP430

I have a MiniSense 100 Vibration Sensor with me, which I am trying to interface with my MSP430 Launchpad to track the vibrations of refrigerator compressor. However, I am not sure if connecting it ...
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0answers
71 views

Loud sound and crystal clock,how big problem it is?

I want to use piezo crystal clock in place where loud sounds exist,I worry that it might decrease the performance of the clock,create spurious tones for example. The db level at the clock will be ...
1
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1answer
577 views

Vibration frequency measurement with a piezo sensor

I have a linear resonant actuator like this one: https://www.gearbest.com/other-accessories/pp_670798.html I need to control its frequency of vibration and for that I intend to use a potentiometer ...
0
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1answer
271 views

Vibration sensor switch for Car

I am building a small GPS tracker for my car using a Raspberry PI Zero plus some additional components. I would like to keep it off unless the car is turned on or it's moved forcefully. To do that I ...
0
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2answers
65 views

Best method for using a PA to drive a vibration table?

Being relatively new to the world of sound and vibration signal manipulation, I am attempting to drive a small vibe table in an open loop configuration. For preliminary trials (AKA learning how to use ...
1
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2answers
108 views

How to further dampen vibration cascading on piezo-elements?

I'm trying to build an electric xylophone. I want it to be pressure/velocity sensitive so I decided to use piezo-elements to pick up 'hits'. Below is a close-up picture of my setup. So every bar you ...
0
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3answers
3k views

Rotate stepper motor in low RPM and minimum vibration

I want to control a stepper motor about 3RPM and at very low vibration. I have a ROLLON SRL-M542H stepper controller.If I change it to high step per revolution it works smoothly without more ...
0
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1answer
35 views

Vibration coupling through clothes as function of frequency

Serious question. Trying to figure out if there is any research/guidelines on selecting the frequency of a vibrator for a portable electronic device. This is safety related wearble device for first ...
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0answers
46 views

Rewiring of a vibration sensor

Can I pass the signal of a (iepe) vibration sensor over a shielded twisted pair instead of the recommended coax cable? The signal also needs to travel over 30-meter cable.
0
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2answers
717 views

sampling rate and frequency response of a vibration sensor

I am trying to measure the vibrations of a lathe machine using a piezoelectric accelerometer sensor. I want to know if the sampling rate can be set at a value greater than the flat response frequency ...
3
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6answers
420 views

Seismic sensors?

I notice that there seem to be relatively few seismic intrusion detection systems available as pre-packaged products, so I am wondering about the feasibility of hacking one up. Is it as simple as ...
0
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2answers
117 views

vibration sensing circuit doing so great

I have attempted this diagram from here: with one modification - instead of the 4093 circuit ( comparator+inverter+hysteresis gates) I have used a HC14 (inverter+hysteresis gates). Can this be why i ...
3
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1answer
140 views

Determining speed of turbocharger via sound?

There are inductive sensors which can be retrofitted to turbochargers to measure their speed, like this: Examples can be seen here. Installation requires some careful and precise drilling and ...
0
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0answers
156 views

Piezo element lifespan in vibration environment

Can anybody guess or does anyone know what lifespan can be expected of this piezoelectric sensor - https://www.sparkfun.com/products/10293 - with a weight glued to it and used inside a passenger ...
1
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1answer
93 views

Footprint design for vibration resistance

I have a product that will be subjected to reliability testing (random vibration and thermal shock) and I need to design a footprint for an SMT power inductor that will give the best mechanical ...
1
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1answer
168 views

Running an induction motor with flickering DC

Is it possible to run(or at least cause some vibrating movement in) an induction motor by powering it with direct current and turning the power on and off? I am aware that if not switched on and off, ...
0
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1answer
181 views

vibration dampening comparison [closed]

I am trying to mitigate between costs, ease of mounting, of enclosure matching and costs for a smallish PCB (< 100 g / 4 oz and about 35 x 50 mm / 1.5 x 2 in) used inside a passenger car. And so ...
1
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1answer
86 views

Field tests for veryfying stator core laminations loose in 3-phase, 3000 HP motor

We have a 4000 V, 3-phase, 366 A, 3575 rpm, 3000 HP induction motor that is making a modulated buzzing noise. The vibration in the horizontal planes of both bearing housings has increase from 0.1 IPS-...
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3answers
2k views

Removing noise from accelerometer data

I am new to signal analysis and I need to remove noise from an accelerometer recording. 2 accelerometers are mounted a machine and recorded vibrations at 500 Hz. The aim is use vibrations to ...
4
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3answers
2k views

How to detect very hard impacts with piezo?

Normally I'm a software guy, but I've recently decided to try my hand at some electronics projects. What I want to do is make my own impact sensor for target shooting. What I'm picturing is a piece of ...
1
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1answer
505 views

Controlling Frequency of a Vibration Motor with Battery Voltage Output

I am looking to operate a Vibration motor at a sustained frequency (40Hz) Please see data sheet as below with an example of a motor. I understand that the best way to do this is to control the output ...
2
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3answers
183 views

Circuit for overdrive on vibrotactile motors

I have a school project where I have to create a haptic feedback wearable with vibrotactile motors. I have gotten the prototype ready which includes motors connected directly to the Raspberry Pi GPIO ...
0
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1answer
98 views

How to use VBT-1 vibration sensor? Why the measurement unit is in mm/s?

I need to use this vibration sensor for my project. I'm confused because of the measurement units. Out value of the sensor is in current 0-20mA, which corresponds to 0-25 mm/sec. Why is it being ...
1
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1answer
508 views

ISO standards test for vibration resistance of electrical equipment

I would like to test some electrical contacts for oxidation wear resistance in indoor environments and in cars including off road vehicles with a lot of vibration. Are there some ISO standard tests ...
0
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2answers
2k views

How to generate 5- 20 Hz mechanical vibrations?

My project deals with simulating a fixed frequency tremor and process it. The required tremor range is 5-20Hz. I have been trying to generate this vibration motion with a vibration motor, but all i ...
-1
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1answer
2k views

Frequency control of vibrator motor

I wish to generate a controllable frequency vibration on a device. The vibration frequency then has to be measured and filtered. For this purpose, I am using a vibrator motor as shown. Now, i wish ...
0
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3answers
630 views

How To Detect a Gunshot

Hey everyone I am working on a project that is a lot harder than what I thought. It is a project for school. How can I detect a gunshot indoors without using an array of microphones? I had something ...
-1
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1answer
1k views

Is there a programmable remote vibration motor? [closed]

I am a developer and loves to develop all kind of things for me to simplify my life. Now I'm looking for the possibility to wear a tiny device that receives signals from an app of mine to vibrate when ...
0
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1answer
641 views

Triangulation Vibration Sensor Impact Detection Position

I am working on a project to detect the position of an impact using three vibration sensors each one of them linked to a micro-controller(in my case STM32F4) . Using ADC and UART ,I can plot with a ...
0
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1answer
268 views

Why is my LED less bright when activated through a vibration switch? How can I avoid this?

total noob here. I'm trying to figure out why an LED in a small circuit isn't getting to full brightness, and how to fix that. It's a simple, pre-bought circuit, seen here http://postimg.org/image/...
0
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1answer
444 views

Vibrating bracelet controlled from cell phone [closed]

I was inspired by this project: How do I build a bracelet that vibrates once every n minutes? but I want to take it a step further. The main idea is creating a vibrating bracelet that is controlled ...
0
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1answer
74 views

Order analysis, need help

Hi fellow electronics enthusiasts. I'm currently working on vibration detection machine used to detect unbalance from a rotating shaft, rotating from 300-2500 Hz. I have both the tacho signal ( 1 PPR )...
0
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1answer
5k views

Arduino piezo vibration measurement circuit

I'm looking for a very simple measurement circuit to measure vibrations with a piezo elment and an arduino device. I want to read positive and negative values. I have this sensor: http://www....
1
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1answer
863 views

Piezo vibration sensor board negative values

I have this piezo vibration sensor module from Grove: http://www.seeedstudio.com/wiki/Grove_-_Piezo_Vibration_Sensor Using this sensor and an arduino device I want to measure two things: amplitude (...