The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a new electronic system using an ATmega328P microcontroller, two ultrasonic sensors and two vibrating motors as a new helping solution for blind people navigation. The block diagram, specific requirements and implementations are described in the paper. Specific design problems and experimental adjustments are mentioned. Future optimizations and developing trends are also considered.
The paper deals with the problem of designing diagnostic systems for technical objects such as power plant, machining etc. The new approach for this problem that is based on the methodology that are used in the design of machines and some aspects of requirement engineering that derived from the software area is considered in the article. In general case the requirements may be used to formalized notation...
We present a network of wireless ultra-low-power sensors with the main purpose of detecting the derailment of a freight car and alerting the engineer in the cab of the leading locomotive. Due to the lack of a power supply in freight cars, we plan to rely on energy scavenging from vibrations. This implies that the energy requirements of the system must be minimized, choosing ultra-low-power hardware...
An electronic experimental system is built in order to generate and record mechanical vibrations in controlled conditions, loads and faults. Mechanical faults are considered and introduced by bearings fixed on rotating shaft. A universal electric motor spins the shaft at known and imposed angular speed, acceleration sensors are used to measure the vibration, and the useful signals are introduced in...
Effective maintenance program provides incipient fault detection of rotating machines which reduces interim, unscheduled and excessive maintenance actions. By applying suitable online condition monitoring accompanied with signal processing techniques, machines irregularity can be detected at early stage. Therefore, this paper presents an online unbalanced rotor fault detection of an induction motor...
Industrialized countries have huge investments in civil infrastructure there is need for the proper structural audits for this Infrastructures. Structural health monitoring approach has come into action which is performed using Smart Sensors, Piezoelectric sensors and accelerometers are used for the environmental and some parameters of Structures, which results into detection of damages in structures...
The paper presents an event driven approach for building interactive environments with sensory effects (such as RGB color light, wind and vibration) described through MPEGV standard. The most important differences of this work from previous ones are: (1) it divides the design process into well defined stages, showing the behavior of the system under a new perspective and their interactions, (2) it...
A common technique of mechanical vibration measurement requires an operator to use vibrometer by attaching the accelerometer directly to a machine. The technique, however, poses a unsafe operation and involves significant man-power. This paper proposes a non-contact vibration measurement for machines condition monitoring by using acoustic emission information. It essentially uses the emitted signal...
Real-time diagnostic and monitoring on railway vehicles for goods transportation is considered. The results of a preliminary experimental activity aimed to model mechanical vibrations and wind speed for autonomous monitoring and diagnostic wireless sensor network fed by means of energy harvesters are reported and commented.
In this paper the external stray flux around a motor has been investigated as a possible new diagnostic instrument to detect generalized roughness. This very common bearing fault has been slightly considered in the literature so far. Stray flux was measured by two probes, one commercially available and one realized in laboratory; the diagnostic content of both signals has been compared also with the...
This paper presents a novel road/terrain classification system based on the analysis of volunteered geographic information gathered by bikers. By ubiquitous collection of multi-sensor bike data, consisting of visual images, accelerometer information and GPS coordinates of the bikers' smartphone, the proposed system is able to distinguish between 6 different road/terrain types. In order to perform...
A new holistic technique for the combined electrical and mechanical condition monitoring (CM) of high voltage (HV) rotating machines has been developed. It is mainly aimed at the oil and gas sector where machine failure can potentially have catastrophic consequences as well as a huge financial cost. The technique combines partial discharge (PD) monitoring, motor current signature analysis (MCSA),...
This paper provides an overview of building structure modeling and control under bidirectional seismic waves. It focuses on different types of bidirectional control devices, control strategies, and bidirectional sensors used in structural control systems. This paper also highlights the various issues like system identification techniques, the time-delay in the system, estimation of velocity and position...
Studying on online monitoring and fault diagnosis system for monitoring vibration, noise, temperature, torque, stress parameters of the driving axle's key parts has a very important practical significance. The system is composed of hardware and software, which are designed into several modules, including slow-speed data acquiring and saving module, fault diagnosis module, high-speed data acquiring...
This paper deals with electromechanical response of piezoelectric nanofibrous materials based on PVdF-TrFe co-polymer obtained by means of electrospinning. This technique, providing electrical poling and mechanical stretching during material processing, should increase the beta crystalline phase and thus piezoelectric effect. Two fiber patterns were analyzed, i.e. aligned and random. Experimental...
Multi Positive Feedback (MPF) control is proposed in this paper for simultaneous resonant vibration displacement and velocity suppression in flexible distributed parameter structures. Two separate sets of control patches are used in the MPF control design, as one set is fed by vibration displacement and the other by vibration velocity. The aggregate applied control output using this approach is non-zero,...
To solve generator problem of the sensor nodes for floating bridge monitoring system, design a kind of self-sustaining circular sheet piezoelectric generator. Its most important feature is the use of a self-sustaining circular sheet piezoelectric structure, it converts the mechanical energy into vibration excitation source, so as to extend the load's continuous effect and correspondingly extend the...
This paper is focused on the hardware and software implementation of DSP algorithms for footstep detection using seismic signal. The main contribution of this research consists in a hardware design and in a software application that process the signals received from the seismic sensor of type SM-24 using PC sound card. The signal samples received from the sensor are stored in a .wav file. The main...
Condition Based Maintenance (CBM) of military helicopters are tracked by Condition Indicators (CI) calculated from Health Usage and Monitoring Systems (HUMS) vibration sensors. Even though many CIs have been proposed and implemented, they remain highly variable and difficult to interpret, leading maintainers to become desensitized to their output. Here we show that a sequential Monte Carlo algorithm...
Early detection of faults in the bearings of electric motors is vital to reduce maintenance costs of industrial motors. Vibration signal analysis is a well-known and widely used diagnostic approach for bearing fault identification, and usually leads to good results in terms of effectiveness and detection capability. However, small defects, at an early stage of development, can be hard to find and...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.