scholarly journals Haptic Virtual Prototyping of Buttons

2013 ◽  
Vol 4 (1) ◽  
pp. 86-96
Author(s):  
Pranav Shrestha
Keyword(s):  
Low Cost ◽  
Virtual Prototyping ◽  
Design Tool ◽  
Haptic Device ◽  
Haptic Interaction ◽  
Push Button ◽  
Commercial Success ◽  
Physical Product ◽  
Tactile Response ◽  
Haptic Simulation

The design of any physical product involves prototyping. Building physical prototypes of the products can be expensive and time consuming. An alternate to physical prototyping is haptic virtual prototyping, which simulates the product using a computer and a haptic device. A haptic device is one that produces the forces similar to that of the product, giving the user a realistic feel of the product. Since the feel of a product plays a significant role in its commercial success, the importance of haptic virtual prototyping as a design tool is increasing. This paper discusses the haptic simulation of a push button on a low cost and commercially available haptic device called Novint Falcon.  Two different models were created – the first one was a simple push button, and the second was an on/off click button. The parameters of the two models were selected such that they have the most accurate tactile response or feel of the product. The two models successfully simulated the feel of the buttons, and it was found that haptic virtual prototyping of buttons is achievable using a low cost haptic interaction system.

Design and Optimization of Multi-Stage Centrifugal Compressors With Uncertainty Quantification of Off Design Performance

2017 ◽  
Author(s):  
A. Romei ◽  
R. Maffulli ◽  
C. Garcia Sanchez ◽  
S. Lavagnoli
Keyword(s):  
Uncertainty Quantification ◽  
Oil And Gas ◽  
Low Cost ◽  
Design Procedure ◽  
Design Tool ◽  
Test Case ◽  
Centrifugal Compressors ◽  
Design Performance ◽  
Leading Role ◽  
Multi Stage

The use of multi-stage centrifugal compressors carries out a leading role in oil and gas process applications. Green operation and market competitiveness require the use of low-cost reliable compression units with high efficiencies and wide operating range. A methodology is presented for the design optimization of multi-stage centrifugal compressors with prediction of the compressor map and estimation of the uncertainty limits. A one-dimensional (1D) design tool has been developed that automatically generates a multi-stage radial compressor satisfying the target machine requirements based on a few input parameters. The compressor performance map is then assessed using the method proposed by Casey-Robinson [1], and the approach developed by Al-Busaidi-Pilidis [2]. The off-design performance method relies on empirical correlations calibrated on the performance maps of many single-stage centrifugal compressors. An uncertainty quantification study on the predicted performance maps was conducted using Monte Carlo method (MCM) and generalized Polynomial Chaos Expansion (gPCE). Finally, the design procedure has been coupled to an in-house optimizer based on evolutionary algorithms. The complete design procedure has been applied to a multi-stage industrial compressor test case. A multi-objective optimization of a multi-stage industrial compressor has been performed targeting maximum compressor efficiency and flow range. The results of the optimization show the existence of optimum compressor architectures and how the Pareto fronts evolve depending on the number of stages and shafts.

Experimental Identification and Analysis of the Dynamics of a PHANToM Premium 1.5A Haptic Device

2008 ◽  
Vol 17 (4) ◽  
pp. 327-343 ◽  
Author(s):  
Babak Taati ◽  
Amir M. Tahmasebi ◽  
Keyvan Hashtrudi-Zaad
Keyword(s):  
Inverse Dynamics ◽  
Viscous Friction ◽  
Force Sensor ◽  
Friction Model ◽  
Haptic Device ◽  
Gravity Compensation ◽  
Force Estimation ◽  
Experimental Identification ◽  
Hand Force ◽  
Haptic Simulation

The dynamics of a PHANToM Premium 1.5A haptic device from SensAble Technologies, Inc. is experimentally identified and analyzed for different installations of the device and its accessories, such as the typical upright, upside down, with gimbal and counterbalance weight, and with force sensor.1 An earlier formulation of the robot dynamic model is augmented with a friction model, linearly parameterized, and experimentally identified using least squares. The identified dynamics are experimentally evaluated with an inverse dynamics controller and verified by comparing user hand force estimates with the measured values. The contribution of different dynamic terms such as inertial, Coriolis and centrifugal, gravitational, and Coulomb and viscous friction are demonstrated and discussed. The identified model can be used for a variety of haptic applications, such as hand force estimation, accurate active gravity compensation and counterbalance weight determination for various installation conditions, and model-based control for haptic simulation and teleoperation.

scholarly journals Simulation of UAV Systems

10.14311/754 ◽  
2005 ◽  
Vol 45 (4) ◽  
Author(s):  
P. Kaňovský ◽  
L. Smrcek ◽  
C. Goodchild
Keyword(s):  
Dynamical System ◽  
Unmanned Aerial Vehicle ◽  
Low Cost ◽  
Design Tool ◽  
Inertial System ◽  
Principal Function ◽  
Low Weight ◽  
High Bandwidth ◽  
Aerial Vehicle ◽  
Selection Of

The study described in this paper deals with the issue of a design tool for the autopilot of an Unmanned Aerial Vehicle (UAV) and the selection of the airdata and inertial system sensors. This project was processed in cooperation with VTUL a PVO o.z. [1]. The feature that distinguishes the autopilot requirements of a UAV (Figs. 1, 7, 8) from the flight systems of conventional manned aircraft is the paradox of controlling a high bandwidth dynamical system using sensors that are in harmony with the low cost low weight objectives that UAV designs are often expected to achieve. The principal function of the autopilot is flight stability, which establishes the UAV as a stable airborne platform that can operate at a precisely defined height. The main sensor for providing this height information is a barometric altimeter. The solution to the UAV autopilot design was realised with simulations using the facilities of Matlab® and in particular Simulink®[2]. 

scholarly journals AN AMPUTATION SIMULATOR WITH BONE SAWING HAPTIC INTERACTION

2006 ◽  
Vol 18 (05) ◽  
pp. 229-236 ◽  
Author(s):  
MING-SHIUM HSIEH ◽  
MING-DAR TSAI ◽  
YI-DER YEH
Keyword(s):  
Real Time ◽  
Surgical Procedures ◽  
Feed Rate ◽  
Haptic Device ◽  
Surgical Simulator ◽  
Haptic Interaction ◽  
Sawing Force ◽  
Bone Changes ◽  
Amputation Surgery ◽  
Ct Slices

This paper describes a haptic device equipped surgical simulator that provides visual and haptic responses for amputation surgery. This simulator, based on our reported volume (constituted from CT slices) manipulation algorithms, can compute and demonstrate bone changes for the procedures in various orthopedic surgeries. The system is equipped with a haptic device. The position and attitude the haptic device are transformed into the volume to simulate and render the oscillating virtual saw together with the virtual bones. The system then judges if every saw tooth immersing in (cutting) any bone. The load for removing the bone chip on a cutting tooth is calculated according to the feed rate, oscillating speed, saw geometry and bone type. The loads on all the saw teeth are then summed into the three positional forces that the haptic device generates and thus the user feels. The system provides real-time visual and haptic refresh speeds for the sawing procedures. A simulation example of amputation surgery demonstrates the sawing haptic and visual feelings of the sawing procedure are consistent and the simulated sawing force resembles the real force. Therefore, this prototype simulator demonstrates the effectiveness as a surgical simulator to rehearsal the surgical procedures, confirm surgical plains and train interns and students.

Maximum Virtual Stiffness Distribution Analysis and Measurement for Haptic Device

2009 ◽  
Author(s):  
Xiaowei Dai ◽  
Yuru Zhang ◽  
Dangxiao Wang
Keyword(s):  
Virtual Environment ◽  
Joint Space ◽  
Performance Measure ◽  
Haptic Device ◽  
Distribution Analysis ◽  
Haptic Interaction ◽  
Position And Orientation ◽  
Virtual Stiffness ◽  
Eigenvalue And Eigenvector ◽  
Stiffness Distribution

Maximum virtual stiffness is a critical performance measure for haptic devices. Stable haptic interaction is necessary for realistic feeling of virtual environment. The virtual environment is determined by the application and device. To ensure the stable haptic interaction, the virtual environment must be suitable for the device. Therefore, the virtual stiffness should not be greater than the minimum value of maximum virtual stiffness that a haptic device can stably render in the workspace. This paper proposes a method, utilizing the eigenvalue and eigenvector of stiffness matrix in joint space, to analyze and measure the maximum virtual stiffness distribution in the work space of a haptic device. Therefore, for a given haptic device, the maximum virtual stiffness at each position and orientation can be forecasted by this method. A new sufficient condition for haptic stability is also presented in the view of driven motor in this paper. A series experiments validate the effectiveness of this method.

On the Ability of Humans to Haptically Identify and Discriminate Real and Simulated Objects

2005 ◽  
Vol 14 (3) ◽  
pp. 366-376 ◽  
Author(s):  
Marcia K. O'Malley ◽  
Michael Goldfarb
Keyword(s):  
Human Subjects ◽  
Haptic Device ◽  
Haptic Interface ◽  
Maximum Force ◽  
Size Discrimination ◽  
Force Output ◽  
Simulated Environments ◽  
Real Objects ◽  
Simulation Results ◽  
Haptic Simulation

The ability of human subjects to identify and discriminate between different-sized real objects was compared with their ability to identify and discriminate between different-sized simulated objects generated by a haptic interface. This comparison was additionally performed for cases of limited force and limited stiffness output from the haptic device, which in effect decrease the fidelity of the haptic simulation. Results indicate that performance of size-identification tasks with haptic-interface hardware capable of a minimum of 3 N of maximum force output can approach performance in real environments, but falls short when virtual surface stiffness is limited. For size-discrimination tasks, performance in simulated environments was consistently lower than performance in a comparable real environment. Interestingly, significant variations in the fidelity of the haptic simulation do not appear to significantly alter the ability of a subject to identify or discriminate between the types of simulated objects described herein.

scholarly journals Helping farmers and regulators manage and assure the cumulative flood safety of agricultural dams: a cost-effective regionalised review/design tool from Australia

2015 ◽  
Vol 47 (5) ◽  
pp. 996-1013 ◽  
Author(s):  
John D. Pisaniello
Keyword(s):  
Climate Change ◽  
Best Practice ◽  
Low Cost ◽  
Cost Effective ◽  
Design Tool ◽  
Community Safety ◽  
Dam Failure ◽  
Future Research ◽  
Dam Safety ◽  
Safety Assurance

In Australia and other countries, small private dams in agricultural catchments pose both disastrous individual and cumulative dam failure flood threats to downstream communities; threats that can be exacerbated by increased rainfall intensities caused by climate change. This paper addresses the need for a low cost, scientifically acceptable mechanism and policy guidance to help dam owners and governments better understand and manage these risks and assure community safety. To this end an innovative, cost-effective farm dam flood safety review/design tool is developed and tested in Australia, including hydrology-diverse Tasmania, to complement best practice dam safety assurance policy. The tool's development involved generating complex catchment data to represent hydrologically homogenous regions using best practice water engineering methods, to derive simple regionalised dam flood capability prediction relationships of acceptable accuracy. Results demonstrate the tool's successful development and potential transferability to different hydrological regions; how the relationships can be refined by future research and potentially made to account for climate change; and how the tool can be applied within a best practice dam safety assurance policy which includes additional farmer-friendly elements. The findings are potentially transferable to any region to assure communities that cumulative safety threats posed by rural catchment dams are minimised.

Experimental and Numerical Development of a Dynamic Clearance Seal for Steam Turbine Application

2016 ◽  
Author(s):  
Andrew Messenger ◽  
Richard Williams ◽  
Grant Ingram ◽  
Simon Hogg ◽  
Stacie Tibos ◽  
...  
Keyword(s):  
Steam Turbine ◽  
Low Cost ◽  
Design Tool ◽  
The Body ◽  
Test Facility ◽  
Experimental Program ◽  
Steam Turbines ◽  
Experimental Proof ◽  
Static Test ◽  
Seal Design

This paper presents a series of experiments on the Aerostatic Seal, a dynamic clearance seal for steam turbine application first described at the 2015 ASME Turbo Expo (Paper Number GT2015-43471). This dynamic clearance seal moves with rotor excursions and so has the potential to deliver a smaller clearance than traditional seals. The concept is an extension of the retractable seal design which is widely used in existing steam turbines. The experimental program was carried out in a low cost static test facility using an aerostatic seal design. The seal exhibited a dynamic clearance response and will therefore respond to rotor excursions. 3D CFD was also used to aid the understanding of flow features not captured by the analytical design tool. Adjustments to both the design process and to future seal designs are proposed in the body of the paper. This paper therefore describes an experimental proof of concept for the aerostatic seal and paves the way for future development in rotating facilities.

scholarly journals Low-cost and portable automatic sheet cutter

2020 ◽  
Vol 10 (5) ◽  
pp. 5139
Author(s):  
Mohd Syafiq Mispan ◽  
Ahmad Hafizzudin Mustafa ◽  
Hafez Sarkawi ◽  
Aiman Zakwan Jidin
Keyword(s):  
Product Quality ◽  
Polyvinyl Chloride ◽  
Low Cost ◽  
Stepper Motor ◽  
Process Automation ◽  
Push Button ◽  
Medium Enterprise ◽  
Measuring Tape ◽  
Increase Productivity

Process automation is crucial to increase productivity, more efficient use of materials, better product quality, improved safety, etc. In small-medium enterprise (SME) businesses related to household retailing, one of the process automation needed is the measurement and cutting of the mat or sheet, made of rubber or polyvinyl chloride (PVC) materials. Most of the household retailers that selling the sheet, the process of measuring and cutting according to the customer’s requirements are manually performed using a measuring tape and scissors. These manual processes can cause inaccuracy in length, inefficient use of material, low productivity and reduce product quality. This paper presents a low cost and portable automatic sheet cutter using the Arduino development board, which is used to control the process of measuring and cutting the materials. The system uses a push-button where the user can set the required length and quantity of the sheet. Once the required information is set, the stepper motor rolls the sheet until the required length is satisfied. Subsequently, another stepper motor moves the cutter horizontally and cut the sheet. With the automatic sheet cutter, the material is cut with acceptable precision. The design of the automatic sheet cutter is low cost and portable which significantly suitable to be used by SME household retailers.

scholarly journals Development and Evaluation of a Portable Spectrophotometer

2019 ◽  
Vol 17 ◽  
pp. 113
Author(s):  
J. P. Cândico ◽  
A. P.P. Macedo ◽  
Eduardo Galembeck
Keyword(s):  
Undergraduate Students ◽  
Field Experiments ◽  
High Reliability ◽  
Low Cost ◽  
Field Studies ◽  
Push Button ◽  
Cuvette Holder ◽  
The One ◽  
Compact Design ◽  
Sd Card

INTRODUCTION: Colorimetric methods, such as proteins and glucose quantification, and enzymatic assays are widely performed in biochemical laboratories employing spectrophotometer equipment. Even being present in most of the labs that serve undergraduate students, low cost and portable spectrophotometers can be a valuable tool in high schools and for field studies. OBJECTIVES: We have assembled and evaluated a portable spectrophotometer, inspired in some open projects freely available on the Internet. MATERIALS AND METHODS: The system was built using an RGB LED as a light source and a light detector (TSL2561). These components were placed into the ends of a cuvette holder, which was designed in FREECAD software and fabricated in a 3D printer. The data collection system was developed using an Arduino UNO microcontroller, an LCD to show the absorbance, a micro SD card to store the results, and a push button to select the LED emitted light wavelength. All components were powered by battery bank of 2000mAh. The software was written in C++, and we used Arduino IDE 1.8.6. For the equipment evaluation, we ran protein (Bradford) and glucose (Somogyi-Nelson) essays comparing the results obtained from the developed equipment with the one used in our didactic lab (Biospectro SP-22). DISCUSSION AND RESULTS: The results obtained comparing both pieces of equipment shows a correlation coefficient of 0.99 for the both methods (Bradford and Somogyi-Nelson) in test-retest. The commercial equipment demonstrated the coefficient of variation higher than 10%, while developed spectrophotometer showed values lower than 5%. The power bank was able to supply energy to the equipment up to 12 hours. CONCLUSION: These results demonstrated high reliability for the data collected from the developed spectrophotometer. Besides the low cost, compact design and high battery autonomy. The developed equipment has presented as a valuable alternative for field experiments and in-class practices of biochemistry.

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