scholarly journals Lessons Learned on the Application of Vibration Absorbers for Enhanced Cannon Stabilization

2001 ◽  
Vol 8 (3-4) ◽  
pp. 131-139 ◽  
Author(s):  
Eric Kathe
Keyword(s):  
Performance Evaluation ◽  
Structural Modification ◽  
Digital Signal ◽  
Field Testing ◽  
Lessons Learned ◽  
External Control ◽  
Control Law ◽  
Vibration Absorbers ◽  
Ideal Behavior ◽  
And Performance

This paper will summarize the successful application of muzzle-end vibration absorbers to reduce cannon vibration. This technology constitutes a weapons stabilization approach that focuses on passive mechanical structural modification of the cannon, rather than relying upon an external control law to actively cancel vibrations. Challenges encountered during field testing, non-ideal behavior, and performance evaluation using digital signal processing will be highlighted.

Analysis of Performance Evaluation Index for bridge group networking monitoring and collaborative supervision

2021 ◽  
Author(s):  
Liye Zhang ◽  
Yong He ◽  
Shoushan Cheng ◽  
Guoliang Wang ◽  
Hongwei Ren ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Evaluation Method ◽  
Field Testing ◽  
Technical Condition ◽  
Evaluation Index ◽  
Technical Problems ◽  
Condition Evaluation ◽  
Bridge Group ◽  
Performance Evaluation Index ◽  
And Performance

<p>With the number of bridges increases, the bridge health monitoring (BHM) technique is developing from single bridge monitoring to collaborative supervision of bridge group. Therefore, there are many technical problems need to be solved especially the performance evaluation index for bridge group network. This paper analyses the performance evaluation index of the bridges and bridge group network, establishes the performance evaluation index for bridge group based on rating factor (RF) and technical condition evaluation index. Based on bridge field testing and monitoring data, bridge technical condition evaluation index and performance evaluation method for bridge group are proposed. A case study demonstrates that the research results provide support for bridge group networking monitoring and collaborative supervision.</p>

Usability and Performance Testing of Hand-held Data-entry Devices for Navy Shipboard Damage Control and Fire-fighting Environments

1995 ◽  
Vol 39 (14) ◽  
pp. 967-967
Author(s):  
James W. Broyles ◽  
Michael Christie
Keyword(s):  
Damage Control ◽  
Data Entry ◽  
Performance Testing ◽  
Field Testing ◽  
Training Group ◽  
Lessons Learned ◽  
Fire Fighting ◽  
Cooperative Research ◽  
And Performance ◽  
Treasure Island

Portable, hand-held, data-entry devices were evaluated for intended use by shipboard engineering repair team personnel for improving on-scene casualty reporting of damage control and fire-fighting efforts. Current on-scene reporting methods use pre-formatted damage control messages, hand carried from the scene of the casualty to the repair lockers, and often rely on two-way radios for rapid transmission of critical casualty information. During the initial reporting period, this process is often confusing, time-late, and sometimes ambiguous or error-prone. Five off-the-shelf data entry devices were tested for usability and performance for data input and display of casualty information in a laboratory setting at the Naval Postgraduate School, Monterey, with follow-on field testing done by damage control and fire-fighting personnel assigned to Fleet Training Center, San Diego and Detachment Treasure Island and the Afloat Training Group, Pacific. Demonstration of these devices, lessons learned on usability testing and building of cooperative research networks between users and the training community will be described.

A Stochastic Regulator for Integrated Communication and Control Systems: Part I—Formulation of Control Law

1991 ◽  
Vol 113 (4) ◽  
pp. 604-611 ◽  
Author(s):  
Luen-Woei Liou ◽  
Asok Ray
Keyword(s):  
Performance Evaluation ◽  
Control Systems ◽  
Dynamic Performance ◽  
State Feedback Control ◽  
Control Law ◽  
Spatially Distributed ◽  
Integrated Communication ◽  
Finite Time Horizon ◽  
And Performance ◽  
And Control

Integrated Communication and Control Systems (ICCS), recently introduced and analyzed in a series of papers [1–7], are applicable to complex dynamical processes like advanced aircraft, spacecraft, automotive, and manufacturing processes. Time-division-multiplexed computer networks are employed in ICCS for exchange of information between spatially distributed plant components as well as for coordination of the diverse control and decision-making functions. Unfortunately, an ICCS network introduces randomly varying, distributed delays within the feedback loops in addition to the digital sampling and data processing delays. These network-induced delays degrade the system dynamic performance, and are a source of potential instability. This two-part paper presents the synthesis and performance evaluation of a stochastic optimal control law for ICCS. In this paper, which is the first of two parts, a state feedback control law for ICCS has been formulated by using the dynamic programming and optimality principle on a finite-time horizon. The control law is derived on the basis of a stochastic model of the plant which is augmented in state space to take into account the effects of randomly varying delays in the feedback loop. The second part [8] presents numerical analysis of the control law and its performance evaluation by simulation of the flight dynamic model of an advanced aircraft.

scholarly journals Walking Strategies and Performance Evaluation for Human-Exoskeleton Systems under Admittance Control

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4346 ◽  
Author(s):  
Chiawei Liang ◽  
Tesheng Hsiao
Keyword(s):  
Performance Evaluation ◽  
Energy Consumption ◽  
Reaction Force ◽  
Sufficient Conditions ◽  
Estimation Algorithm ◽  
Walking Distance ◽  
Control Law ◽  
Admittance Control ◽  
Communication Module ◽  
And Performance

Lower-limb exoskeletons as walking assistive devices have been intensively investigated in recent decades. In these studies, intention detection and performance evaluation are important topics. In our previous studies, we proposed a disturbance observer (DOB)-based torque estimation algorithm and an admittance control law to shape the admittance of the human-exoskeleton system (HES) and comply with the user’s walking intention. These algorithms have been experimentally verified under the condition of no ground reaction force (GRF) in our previous studies. In this paper, we devised and integrated with the exoskeleton control system a sensing and communication module on each foot to measure and compensate for GRF. Rigorous theoretical analysis was performed and the sufficient conditions for the robust stability of the closed-loop system were derived. Then, we conducted level ground assistive walking repeatedly with different test subjects and exhaustive combinations of admittance parameters. In addition, we proposed two tractable and physically insightful performance indices called normalized energy consumption index (NECI) and walking distance in a fixed period of time to quantitatively evaluate the performance for different admittance parameters. We also compared the energy consumption for users walking with and without the exoskeleton. The results show that the proposed admittance control law reduces the energy consumption of the user during level ground walking.

scholarly journals Development and performance evaluation of manually operated Potato planter

2018 ◽  
Vol 33 (00) ◽  
Author(s):  
Falguni Rathore ◽  
Shalini Chaturvedi
Keyword(s):  
Performance Evaluation ◽  
Field Capacity ◽  
Field Testing ◽  
Effective Field ◽  
Furrow Opener ◽  
Potato Planter ◽  
Field Efficiency ◽  
And Performance ◽  
The Cost ◽  
Seed Metering Device

Development and performance evaluation of manually operated potato planter. The manually operated potato planter consists frame, ground wheel, transmission for seed metering device, seed box, metering mechanism, seed tube, furrow opener and handle. The speed of planter was 1.8 km/h and 2.5 km/h respectively. The moisture content of soil was 17.2%. in the field testing, It was observed that the effective field capacity was 0.0191 ha/h at the speed of 1.8 km/h . and the field efficiency was maximum i.e. 81.3 % at the speed of 1.8 km/h and minimum was 61.5% at the speed of 2.5km/h. The cost of planting by the planter was Rs. 1680 / - per hectare.

Sign in / Sign up

Export Citation Format

Share Document