Study on Measurement of Six-DOF Force/Torque for Loading Experiment on Heavy Load Equipment

2014 ◽  
Vol 543-547 ◽  
pp. 1115-1118 ◽  
Author(s):  
Yun Lu ◽  
Wei Jia Li ◽  
Wen Zhuo Tian ◽  
Kai Zhou
Keyword(s):  
Fatigue Test ◽  
High Sensitivity ◽  
Force Sensor ◽  
Test System ◽  
Large Engine ◽  
Heavy Load ◽  
Good Ability ◽  
Calibration Experiment ◽  
Generalized Force ◽  
Six Dof

According to the requirements of fatigue test of aircraft cabin, large engine and mining machinery for heavy-duty six dimensional generalized force sensors, a new method of using piezoelectric quartz as force-sensitive element on the basis of the theory of heavy force division and equivalent capacity compression is proposed in this study. Furthermore, in order to minimize the force-coupling for the six-dimension force sensor, the optimization objective function is devised and the calculation method for decoupling is also proposed, on the basis of which, the generalized force sensor with high sensitivity, high stiffness, high linearity but light in its weight is designed. At last, the static calibration experiment is carried out the result shows that the sensor has a good ability of heavy force division and capacity for equivalent compression it can be well used in large tonnage six component force loading device and fatigue test system.

Study on a Six-Axis Sensor for Measuring the Loading Force of Large-Scale Equipment in Fatigue Test

2014 ◽  
Author(s):  
Yun Lu ◽  
Weijia Li ◽  
Kai Zhou ◽  
Xiao Wang ◽  
Yaozhong Wu
Keyword(s):  
Fatigue Test ◽  
Mechanical Model ◽  
Large Scale ◽  
Force Sensor ◽  
Large Structure ◽  
Heavy Load ◽  
Static Calibration ◽  
Calibration Experiment ◽  
Basic Performance ◽  
New Type

Aiming at solving the problem of measuring six-axis heavy load and improving measuring accuracy in fatigue test of large structure, this study presents a new type of six-axis force sensor based on the heavy load division principle. The sensor is made with piezoelectric quartz which is used as force sensitive element. This study proposes a type of four point support structure and the spatial mechanical model is deducted for the sensor. Finally, the static calibration experiment is carried out in this study. Experimental results show that the six-axis force of heavy load equipment can be measured with this type of sensor. The basic performance of the sensor shows that it can meet the engineering requirements well.

scholarly journals A Flexible Load Control Strategy for Distribution Network to Reduce the Line Losses and to Eliminate the Transmission Congestion

2017 ◽  
Vol 2017 ◽  
pp. 1-16 ◽  
Author(s):  
Beibei Wang ◽  
Xiaoqing Hu ◽  
Peifeng Shen ◽  
Wenlu Ji ◽  
Yang Cao ◽  
...  
Keyword(s):  
Power Distribution ◽  
Distribution Systems ◽  
Renewable Energy Sources ◽  
Distribution Network ◽  
Test System ◽  
Operating Conditions ◽  
Load Control ◽  
Transmission Congestion ◽  
Heavy Load ◽  
Flexible Load

There are many uncertain factors in the modern distribution network, including the access of renewable energy sources and the heavy load level. The existence of these factors has brought challenges to the stability of the power distribution network, as well as increasing the risk of exceeding transmission capacity of distribution lines. The appearance of flexible load control technology provides a new idea to solve the above problems. Air conditioners (ACs) account for a great proportion of all loads. In this paper, the model of dispatching AC loads in the regional power grid is constructed, and the direct load control (DLC) method is adopted to reduce the load of ACs. An improved tabu search technique is proposed to solve the problem of network dispatch in distribution systems in order to reduce the resistive line losses and to eliminate the transmission congestion in lines under normal operating conditions. The optimal node solution is obtained to find the best location and reduction capacity of ACs for load control. To demonstrate the validity and effectiveness of the proposed method, a test system is studied. The numerical results are also given in this article, which reveal that the proposed method is promising.

scholarly journals Clinical Value of Multiplexed Bead-Based Immunoassays for Detection of Autoantibodies to Nuclear Antigens

2007 ◽  
Vol 14 (5) ◽  
pp. 505-509 ◽  
Author(s):  
Erik Avaniss-Aghajani ◽  
Sophia Berzon ◽  
Arlen Sarkissian
Keyword(s):  
Lupus Erythematosus ◽  
Fluorescent Antibody ◽  
False Positive Rate ◽  
High Sensitivity ◽  
Test System ◽  
Lower Percentage ◽  
Clinical Value ◽  
Specificity And Sensitivity ◽  
Relative Specificity ◽  
Positive Results

ABSTRACT The advent of multiplexed bead assays in recent years has introduced a new dimension of testing for complex diseases such as lupus, which can involve multiple autoantibodies. The ability to rapidly identify multiple autoantibodies, with high sensitivity and specificity in an automated fashion, is highly attractive. The aim of this study was to assess the performance and clinical value of multiplexed bead-based (AtheNA Multi-Lyte ANA-II test system) immunoassays both by comparing the results with those achieved by indirect fluorescent-antibody assay (IFA) or conventional enzyme immunoassays (EIAs) and by independent identification of autoantibodies in well-characterized samples. To achieve this goal, 984 samples were tested for seven analytes (SS/A, SS/B, Sm, RNP, Scl-70, double-stranded DNA [dsDNA], and centromere B) in both traditional and bead-based assays. The average concordance for the different analytes was 91%, ranging from 81% (dsDNA) to 97% (centromere B). The average relative specificity and sensitivity for the analytes were also high, 92% and 81%, respectively. An examination of 93 “normal controls” demonstrated a 7% false-positive rate, which was comparable to IFA. Percentages of different autoantibodies found in patients with a variety of disease conditions (34 with calcinosis, Raynaud's phenomenon, esophageal dysmotility, sclerodactyly, and telangiectasia; 41 with mixed connective tissue disease; 24 with scleroderma; and 35 with Sjogren's syndrome) were well within the range expected from each group. A scrutiny of results from AtheNA and EIA and Farr results for 185 systemic lupus erythematosus samples revealed comparable results by both methods, with the exception of SS/A and dsDNA, where AtheNA had a higher percentage of SS/A-positive results compared to EIA (51% versus 29%) and a lower percentage of dsDNA-positive results (18% versus 28% at a cutoff of 5 IU/ml).

Research on PVDF Micro-Force Sensor

2014 ◽  
Vol 599-601 ◽  
pp. 1135-1138
Author(s):  
Chao Zhe Ma ◽  
Jin Song Du ◽  
Yi Yang Liu
Keyword(s):  
Power Dissipation ◽  
Polyvinylidene Fluoride ◽  
High Sensitivity ◽  
Force Sensor ◽  
Calibration Method ◽  
Pvdf Film ◽  
Force Sensors ◽  
Low Power Dissipation ◽  
Micro Force Sensor ◽  
Processing Circuit

At present, sub-micro-Newton (sub-μN) micro-force in micro-assembly and micro-manipulation is not able to be measured reliably. The piezoelectric micro-force sensors offer a lot of advantages for MEMS applications such as low power dissipation, high sensitivity, and easily integrated with piezoelectric micro-actuators. In spite of many advantages above, the research efforts are relatively limited compared to piezoresistive micro-force sensors. In this paper, Sensitive component is polyvinylidene fluoride (PVDF) and the research object is micro-force sensor based on PVDF film. Moreover, the model of micro-force and sensor’s output voltage is built up, signal processing circuit is designed, and a novel calibration method of micro-force sensor is designed to reliably measure force in the range of sub-μN. The experimental results show the PVDF sensor is designed in this paper with sub-μN resolution.

scholarly journals Collision-Free Path-Planning for Six-DOF Serial Harvesting Robot Based on Energy Optimal and Artificial Potential Field

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Lufeng Luo ◽  
Hanjin Wen ◽  
Qinghua Lu ◽  
Haojie Huang ◽  
Weilin Chen ◽  
...  
Keyword(s):  
Path Planning ◽  
Potential Field ◽  
Test System ◽  
Planning Method ◽  
Artificial Potential Field ◽  
Optimal Method ◽  
Planning Algorithm ◽  
Six Dof ◽  
Searching Method ◽  
Harvesting Robot

Collision-free autonomous path planning under a dynamic and uncertainty vineyard environment is the most important issue which needs to be resolved firstly in the process of improving robotic harvesting manipulator intelligence. We present and apply energy optimal and artificial potential field to develop a path planning method for six degree of freedom (DOF) serial harvesting robot under dynamic uncertain environment. Firstly, the kinematical model of Six-DOF serial manipulator was constructed by using the Denavit-Hartenberg (D-H) method. The model of obstacles was defined by axis-aligned bounding box, and then the configuration space of harvesting robot was described by combining the obstacles and arm space of robot. Secondly, the harvesting sequence in path planning was computed by energy optimal method, and the anticollision path points were automatically generated based on the artificial potential field and sampling searching method. Finally, to verify and test the proposed path planning algorithm, a virtual test system based on virtual reality was developed. After obtaining the space coordinates of grape picking point and anticollision bounding volume, the path points were drew out by the proposed method. 10 times picking tests for grape anticollision path planning were implemented on the developed simulation system, and the success rate was up to 90%. The results showed that the proposed path planning method can be used to the harvesting robot.

The thrust measurement system research for combined nozzle in small space

2018 ◽  
Vol 41 (4) ◽  
pp. 1149-1159
Author(s):  
Yonghua Lu ◽  
Jing Li ◽  
Xiang Zhang ◽  
Yang Li
Keyword(s):  
Measurement System ◽  
Force Sensor ◽  
Test Method ◽  
Small Space ◽  
System A ◽  
Calibration Experiment ◽  
Different Types ◽  
Thrust Measurement ◽  
Nozzle Thrust ◽  
Thrust Forces

For measuring the thrust of combined nozzles in satellite thruster with a small space, the test method that the nozzle directly sprays on the load baffle is employed in this paper. The key problem is how to design the positions of 10 load baffles and how to construct the measurement system. A set of complete and automatic nozzle thrust measurement system is designed and built, and the influence of the load baffle applied on the flow field of nozzles is analyzed using the software FLUENT. Furthermore, the load surface locations of the sensors for the different types of nozzles are analyzed. We draw the conclusion that the load baffle position should range from 4–8 mm for the I-type nozzle and range in 6–12 mm for II-type and III-type nozzle. The correction coefficients of the thrust forces for all channels of the measurement system are determined in the calibration experiment. The uncertainty of measurement system is estimated and the error source of the measurement system is traced. We found that the systematic uncertainty is mainly contributed by the A-type uncertainty which is related with the nozzle dimension and its inner structure. The B-type uncertainty of system is contributed by the force sensor.

scholarly journals ThE uSE of AbErrAnT METhylATEd gEnES SEPT9 And VIM for clInIcAl dIAgnoSIS of colorEcTAl cAncEr

2016 ◽  
Vol 7 (4) ◽  
pp. 15-20
Author(s):  
O I Brovkina ◽  
M G Gordiev ◽  
D S Khodyrev ◽  
A G Nikitin ◽  
A V Averyanov
Keyword(s):  
Colorectal Cancer ◽  
High Sensitivity ◽  
Test System ◽  
Aberrant Methylation ◽  
Adjacent Tissue ◽  
Epigenetic Events ◽  
Combined Use ◽  
Ras Family ◽  
Definition Of ◽  
Tumor Dna

Definition of epigenetic disorders is important for early diagnosis of colorectal cancer. To obtain a model of diagnostic test system with high sensitivity and specificity, we determined the frequency of methylation in SEPT9 and VIM genes. Epigenetic events also were compared with mutations in the RAS family genes. It was confirmed the presence of aberrant methylation in SEPT9 and VIM genes in tumor cells. DNA of tumor samples was significantly more methylated than samples with DNA from adjacent tissue (P = 8,67E-19 for SEPT9 gene and P=8,68E-19 for VIM gene). In the group of patients carried mutations in KRAS or NRAS genes tumor DNA significantly more methylated in gene SEPT9 (P = 0.0018), in contrast to the tumor DNA from patients not carried mutations. We have demonstrated that the combined use of methylation markers can improve the sensitivity of the test systems used in the diagnostics of colon cancer.

scholarly journals Bendductor—Transformer Steel Magnetomechanical Force Sensor

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8250
Author(s):  
Przemysław Grenda ◽  
Monika Kutyła ◽  
Michał Nowicki ◽  
Tomasz Charubin
Keyword(s):  
Electrical Steel ◽  
High Sensitivity ◽  
Deformation Mode ◽  
Force Sensor ◽  
Stress Sensitivity ◽  
Linear Characteristic ◽  
Bending Load ◽  
Load Mode ◽  
Magnetoelastic Sensors ◽  
Selection Of

In this paper, the design and investigation of an innovative force sensor, based on the Villari effect, is presented. The sensor was built from electrical steel, in a pressductor pattern, but working in bending load mode. The results of the experimental research allowed for the evaluation of transducer’s performance, mitigation of measurement hysteresis, and optimization of its functional parameters. Several issues have been examined, among them the selection of supply and measured signals, the measured values’ impact on measurement hysteresis, harmonic analysis, and the selection of proper current waveforms and frequencies. The proposed sensor is robust, made from inexpensive materials, and has high sensitivity, as compared to other magnetoelastic sensors. It has much higher stress sensitivity than other magnetoelastic sensors due to deformation mode. Based on the tests, its measuring range can be defined as 0.5–5 N with a near-linear characteristic, SNR of 46 dB, and 0.11 N uncertainty.

Sign in / Sign up

Export Citation Format

Share Document