Smart civil structures
Book file PDF easily for everyone and every device.
You can download and read online Smart civil structures file PDF Book only if you are registered here.
And also you can download or read online all Book PDF file that related with Smart civil structures book.
Happy reading Smart civil structures Bookeveryone.
Download file Free Book PDF Smart civil structures at Complete PDF Library.
This Book have some digital formats such us :paperbook, ebook, kindle, epub, fb2 and another formats.
Here is The CompletePDF Book Library.
It's free to register here to get Book file PDF Smart civil structures Pocket Guide.
Pramod Kumar Gupta. Gurjar Website. Prasad Hari.
Ashraf Iqbal. Kamal Jain. Absar Ahmad Kazmi. Pramod Kumar. Praveen Kumar On lien. Samadhiya Narendra Kumar. Priti Maheshwari. Anumita Mishra. Satyendra Mittal. Vipul Prakash. Ransinchung R. Rajat Rastogi Website.
Smart Civil Structures: You-Lin Xu: Telegraph bookshop
Sonalisa Ray. Interests : Structural Engineering, Fracture Mechanics, , Fracture and Fatigue analysis in Concrete Structures, Size effect studies Concrete, Crack modelling, , Concrete fracture Modelling at various scales, Residual life assessment of concrete structures,. Jagdish Prasad Sahoo. Interests : Foundation Engineering, Bearing capacity of footings, Ultimate resistance of anchors;, Stability of soil structures, Slopes, Under ground excavations, Tunnelling;, Earth retaining structures, Retaining walls, Sheet piles, Reinforced earth walls. Sudipta Sarkar. Vishwas A Sawant.
Pramod Kumar Sharma. Interests : Groundwater hydrology and hydraulics; Experimental studies on flow and solute transport, Flow and Contaminant Transport through Porous media and Fractured-Porous Rock; Mathematical modeling. Umesh Kumar Sharma.
- American Sons: The Untold Story of the Falcon and the Snowman.
- Smart Civil Structures - You-Lin Xu, Jia He - Google книги!
- The Compleat Day Trader Volume II 1998?
- Smart Civil Structures - You-Lin Xu, Jia He - Google книги?
- APESS 12222 - 12th Asia-Pacific-Euro Summer School on Smart Structures Technology;
Bhupinder Singh. Gargi Singh. Mahendra Singh. Akanksha Tyagi. Vinay Kumar Tyagi Website. Bhanu Prakash Vellanki.
- BE THE FIRST TO KNOW!
- Smart Civil Structures by You Lin Xu and Jia He (, Hardcover) for sale online | eBay!
- Software Specification Methods: An Overview Using a Case Study (Formal Approaches to Computing and Information Technology (FACIT)).
Interests : Environmental Engineering, Advanced oxidation processes for the treatment of industrial wastes, Emerging contaminants, Fate and management, Disinfection by products, Attenuation by biofiltration. Gupta Website. Mehrotra, Indu Ms. The processor is further connected to receive a signal indicating that the wire is vibrating. Another aspect of the present patent application is a gauge for measuring a property of a structure, comprising a wire, a coil, a switch, a processor, and a power supply.
Extending service life civil structures
The switch is connected to the power supply and to the coil to provide current to the coil when the switch is closed. A control terminal of the switch is connected to the processor. Timing of closing and opening the switch is controlled by a signal from the processor to provide a train of pulses to the coil having a pulse frequency. The coil emits a train of magnetic pulses at the pulse frequency for stimulating the wire to vibrate.
Another aspect of the present patent application is a method of making a measurement. The method includes providing a wire, a coil, a processor, and a power supply. A train of pulses is provided to the coil, wherein the train of pulses is derived from the power supply under control of the processor. A signal derived from vibration of the wire is received between pulses of the train of pulses.
The method includes providing a housing, the housing including a wire, a coil, and a processor. The wire is mounted in the housing to vibrate at a natural frequency and the coil is magnetically coupled to the wire. An excitation signal derived from the processor is provided to the coil. A signal derived from vibration of the wire is received.
The method includes providing a wire, a coil, a processor, a switch, and a power supply.
The switch includes a control terminal connected to the processor. A first signal from the processor to the control terminal is provided to repeatedly close and to open the switch to provide a train of current pulses from the power supply to the coil. The first signal has a first pulse frequency. The train of current pulses has the first pulse frequency and the coil emits a train of magnetic pulses at the first pulse frequency for stimulating the wire to vibrate. The foregoing will be apparent from the following detailed description as illustrated in the accompanying drawings, in which:.
The present application provides a system for plucking a vibrating wire sensor and then for sensing the natural frequency of vibration of the wire that uses much less power than any previous system. The miniaturized system significantly reduces the power needed for plucking the vibrating wire.
An algorithm is presented herein that provides digital signals from a microcontroller turning on a switch provides short current pulses in the coil. The microcontroller iteratively adjusts characteristics of the current pulses until stimulation that is close to the natural vibration frequency of the wire is provided and the wire vibrates. For exciting the wire into motion, a current pulse of relatively small amplitude is repeatedly switched into the coil from a power supply and switched off.
In one embodiment, each time the current is switched off a detection circuit is activated to detect vibration in the wire. Switching and detection timing are both controlled by a microcontroller. The excitation current pulses create a weak magnetic field that draws the wire toward the coil a very small distance. If the rate these current pulses are applied is equal to the natural resonant frequency of the wire, or a harmonic multiple or subharmonic of the resonant frequency of the wire, mechanical vibration of the wire will quickly grow, becoming large enough in amplitude to be detected by current induced in the coil during times when the excitation current is off.
In one embodiment the detection step occurs in between every excitation pulse. The timing of the excitation and detection cycles is tuned by the microcontroller to excite the wire into detectable level of vibration using much less power consumption than previous techniques. The power required to excite the wire into vibration is many orders of magnitude lower when the pulses are applied close to the natural resonant frequency of the wire, or a frequency that is harmonically related to the natural resonant frequency of the wire.
The present applicants have been able to provide excitation pulses using an amount of power so low that they would only be successful at exciting the wire to vibration when applied at the natural resonant frequency of the wire. And they have provided a digital way to close in on this frequency and to narrow the range of steps needed to close in when embarking on subsequent measurements after the resonant frequency has once been found, further lowering the power consumption. The present applicants found power consumption during sleep mode was only 90 uW. They provided that the read to sleep ratio was programmable.
Smart Civil Structures
In one mode of operation they took readings every second, and the device drew 9 mW average power, which is about an order of magnitude improvement over previous systems. In another mode of operation they took readings every 15 minutes, and the average power for reading and sleeping portions combined over the 15 minute period was uW, which is about three orders of magnitude improvement over previous systems. A calculation of battery life in each mode is provided herein below and demonstrates that extremely long battery life can be achieved.