Worm and Worm Wheel Kinematics Simulation of a Rail Transport Based on ADAMS

2014 ◽  
Vol 945-949 ◽  
pp. 818-821
Author(s):  
Zi Yi Tang ◽  
Xue Jun Wang
Keyword(s):  
Angular Acceleration ◽  
Rail Transport ◽  
Element Analysis ◽  
Compact Structure ◽  
Mechanism Optimization ◽  
Kinematics Simulation ◽  
Design Cycle ◽  
Solid Edge ◽  
The Cost

Worm and worm gear is widely used in modern mechanical industry, it has a lot of advantages including large transmission ratio, compact structure, strong bearing capacity, stable transmission and self-locking performance etc. However, the kinematics characteristic is very important for the performance of equipment. So this article to the worm as the research object, which of the lifting mechanism in rail transport. First, making 3D modeling by Solid Edge V20, Then put the 3D model into the ADAMS, and start the kinematics simulation about transmission mechanism. This paper mainly simulates the angular velocity and angular acceleration of worm when its working, then comparing the change law of the motion curves, and analysis of the results. It can shorten design cycle, improve the design accuracy, reduce the cost of product development, and also create the conditions for the follow-up mechanism optimization and finite element analysis.

Optimization Design for the Diaphragm Spring of Automobile Clutch

2014 ◽  
Vol 889-890 ◽  
pp. 268-271
Author(s):  
Cui Xia Guo ◽  
Hong Zhi Zhang
Keyword(s):  
Optimization Design ◽  
Elastic Characteristic ◽  
Basic Structure ◽  
Design Parameters ◽  
Element Analysis ◽  
Design Cycle ◽  
Overall Performance ◽  
Design Requirements ◽  
The Cost ◽  
The Mathematical Model

The diaphragm spring is the key element in modern automobile clutch. Its elastic characteristic affects the overall performance of the clutch. Taking a car as an example, According to the design requirements and characteristics, it was to establish the mathematical model of optimum design of automobile clutch diaphragm spring. It was to optimize the design parameters of the basic structure of the diaphragm spring by using the MATLAB optimization toolbox. It did finite element analysis for the 3D modeling using ANSYS software. The results show that: it can be obtained more reasonably of the diaphragm spring elastic curve by the optimal design, shorten the design cycle, reduce the cost of.

Design of Seeding Machine Based on the SolidEdge

2014 ◽  
Vol 933 ◽  
pp. 633-636
Author(s):  
Xu Jiang ◽  
Tao Wu
Keyword(s):  
3D Modeling ◽  
3D Model ◽  
Work Efficiency ◽  
Design Quality ◽  
Design Efficiency ◽  
The People ◽  
Design Cycle ◽  
Design Requirements ◽  
Solid Edge ◽  
The Cost

A device to control the amount of seeding is designed, which replaces the people in the entire reseeding process of double digging, planting, covering soil. So the work efficiency is improved. According to the design requirements of the seeding device, Solid Edge V18 software is used to build 3D model. On the software platform, the parts are designed and assembled. The correctness of the design scheme and feasibility is confirmed. Linkage has two functions such as blocking soil and protecting the seed. Using the software for 3D modeling greatly shortens the design cycle, improves design efficiency and design quality, and reduces the cost.

Parameter Design and Analysis on Axial Hybrid Magnetic Bearing Using in Magnetic Suspension Flywheel

2014 ◽  
Vol 529 ◽  
pp. 125-129
Author(s):  
Run Zhang Zeng ◽  
Huang Qiu Zhu
Keyword(s):  
Bearing Capacity ◽  
High Efficiency ◽  
Position Control ◽  
Magnetic Bearing ◽  
Magnetic Suspension ◽  
Parameter Design ◽  
Element Analysis ◽  
Compact Structure ◽  
Mathematical Expressions ◽  
The Cost

Magnetic suspension flywheel system is the actuator of spacecraft in high accurate position control, which requires the employed magnetic bearing possessing advantages of compact structure, small volume, light weight, low power loss, high efficiency and so on. A novel axial hybrid magnetic bearing in magnetic suspension flywheel is proposed, and the bias magnetic flux is provided with a permanent magnet ring. The cost and total volume of this structure can be reduced, which is especially suitable for magnetic suspension flywheel system. The structure and working principle of the axial magnetic bearing are explained, the mathematical expressions of the maximum bearing capacity are obtained, the detailed process of parameter design is presented, and the flux and maximum bearing capacity of the hybrid magnetic bearing are analyzed by using finite element analysis software. The analysis results validate the correctness of parameter design on the axial hybrid magnetic bearing.

The 3D Finite Element Analysis of Magnetic Controlled Reactor

2014 ◽  
Vol 945-949 ◽  
pp. 185-189
Author(s):  
Hui Xu ◽  
Zhong Dong Yin ◽  
Bin Wang
Keyword(s):  
Temperature Rise ◽  
Power Loss ◽  
Reactive Power ◽  
Element Analysis ◽  
3 Dimensional ◽  
Accurate Quantitative Analysis ◽  
Design Cycle ◽  
Dimensional Simulation ◽  
Controllable Reactor ◽  
The Cost

Magnetic controllable reactor (MCR) has many advantages in reactive power compensation in high voltage system, but the power loss and temperature rise problems limit its working capacity and impact its advantages. To improve its performance, a more accurate quantitative analysis about the condition of power loss and temperature rise in MCR is needed. This article uses ANSYS software to build a 3-dimensional simulation model about a dry-type MCR. The model analyses its magnetic field distribution, power loss and temperature rise. The silulation results is proved by experiment. This research provides an effective method and a theoretical basis to design the new structure of MCR and considerably reduces the design cycle and the cost.

scholarly journals More for less: predicting and maximizing genomic variant discovery via Bayesian nonparametrics

Biometrika ◽  
2021 ◽  
Author(s):  
Lorenzo Masoero ◽  
Federico Camerlenghi ◽  
Stefano Favaro ◽  
Tamara Broderick
Keyword(s):  
Optimal Allocation ◽  
Bayesian Nonparametrics ◽  
Allocation Of Resources ◽  
Experimental Conditions ◽  
Follow Up Study ◽  
Variant Discovery ◽  
Fixed Budget ◽  
The Cost ◽  
Genomic Variant

Abstract While the cost of sequencing genomes has decreased dramatically in recent years, this expense often remains non-trivial. Under a fixed budget, scientists face a natural trade-off between quantity and quality: spending resources to sequence a greater number of genomes or spending resources to sequence genomes with increased accuracy. Our goal is to find the optimal allocation of resources between quantity and quality. Optimizing resource allocation promises to reveal as many new variations in the genome as possible. In this paper, we introduce a Bayesian nonparametric methodology to predict the number of new variants in a follow-up study based on a pilot study. When experimental conditions are kept constant between the pilot and follow-up, we find that our prediction is competitive with the best existing methods. Unlike current methods, though, our new method allows practitioners to change experimental conditions between the pilot and the follow-up. We demonstrate how this distinction allows our method to be used for more realistic predictions and for optimal allocation of a fixed budget between quality and quantity.

447 Cost-Effectiveness of a 3-Year Tele-OSA Intervention

SLEEP ◽  
2021 ◽  
Vol 44 (Supplement_2) ◽  
pp. A177-A177
Author(s):  
Jaejin An ◽  
Dennis Hwang ◽  
Jiaxiao Shi ◽  
Amy Sawyer ◽  
Aiyu Chen ◽  
...  
Keyword(s):  
Cost Effectiveness ◽  
Willingness To Pay ◽  
Incremental Cost ◽  
Economic Benefits ◽  
Small Sample ◽  
Apnea Hypopnea Index ◽  
Obstructive Sleep ◽  
Group 2 ◽  
The Cost

Abstract Introduction Trial-based tele-obstructive sleep apnea (OSA) cost-effectiveness analyses have often been inconclusive due to small sample sizes and short follow-up. In this study, we report the cost-effectiveness of Tele-OSA using a larger sample from a 3-month trial that was augmented with 2.75 additional years of epidemiologic follow-up. Methods The Tele-OSA study was a 3-month randomized trial conducted in Kaiser Permanente Southern California that demonstrated improved adherence in patients receiving automated feedback messaging regarding their positive airway pressure (PAP) use when compared to usual care. At the end of the 3 months, participants in the intervention group pseudo-randomly either stopped or continued receiving messaging. This analysis included those participants who had moderate-severe OSA (Apnea Hypopnea Index >=15) and compared the cost-effectiveness of 3 groups: 1) no messaging, 2) messaging for 3 months only, and 3) messaging for 3 years. Costs were derived by multiplying medical service use from electronic medical records times costs from Federal fee schedules. Effects were average nightly hours of PAP use. We report the incremental cost per incremental hour of PAP use as well as the fraction acceptable. Results We included 256 patients with moderate-severe OSA (Group 1, n=132; Group 2, n=79; Group 3, n=45). Group 2, which received the intervention for 3 months only, had the highest costs and fewest hours of use and was dominated by the other two groups. Average 1-year costs for groups 1 and 3 were $6035 (SE, $477) and $6154 (SE, $575), respectively; average nightly hours of PAP use were 3.07 (SE, 0.23) and 4.09 (SE, 0.42). Compared to no messaging, messaging for 3 years had an incremental cost ($119, p=0.86) per incremental hour of use (1.02, p=0.03) of $117. For a willingness-to-pay (WTP) of $500 per year ($1.37/night), 3-year messaging has a 70% chance of being acceptable. Conclusion Long-term Tele-OSA messaging was more effective than no messaging for PAP use outcomes but also highly likely cost-effective with an acceptable willingness-to-pay threshold. Epidemiologic evidence suggests that this greater use will yield both clinical and additional economic benefits. Support (if any) Tele-OSA study was supported by the AASM Foundation SRA Grant #: 104-SR-13

Concomitant Osteotomy Reduces Risk of Reoperation Following Cartilage Restoration Procedures of the Knee: A Matched Cohort Analysis

Cartilage ◽  
2021 ◽  
pp. 194760352110115
Author(s):  
Jacob G. Calcei ◽  
Kunal Varshneya ◽  
Kyle R. Sochacki ◽  
Marc R. Safran ◽  
Geoffrey D. Abrams ◽  
...  
Keyword(s):  
Cohort Analysis ◽  
Reoperation Rate ◽  
Similar Rate ◽  
Osteochondral Allograft ◽  
Complication Rates ◽  
Cartilage Restoration ◽  
Chondrocyte Implantation ◽  
The Cost ◽  
Reoperation Rates

Objective The objective of this study is to compare the (1) reoperation rates, (2) 30-day complication rates, and (3) cost differences between patients undergoing isolated autologous chondrocyte implantation (ACI) or osteochondral allograft transplantation (OCA) procedures alone versus patients with concomitant osteotomy. Study Design Retrospective cohort study, level III. Design Patients who underwent knee ACI (Current Procedural Terminology [CPT] 27412) or OCA (CPT 27415) with minimum 2-year follow-up were queried from a national insurance database. Resulting cohorts of patients that underwent ACI and OCA were then divided into patients who underwent isolated cartilage restoration procedure and patients who underwent concomitant osteotomy (CPT 27457, 27450, 27418). Reoperation was defined by ipsilateral knee procedure after the index surgery. The 30-day postoperative complication rates were assessed using ICD-9-CM codes. The cost per patient was calculated. Results A total of 1,113 patients (402 ACI, 67 ACI + osteotomy, 552 OCA, 92 OCA + osteotomy) were included (mean follow-up of 39.0 months). Reoperation rate was significantly higher after isolated ACI or OCA compared to ACI or OCA plus concomitant osteotomy (ACI 68.7% vs. ACI + osteotomy 23.9%; OCA 34.8% vs. OCA + osteotomy 16.3%). Overall complication rates were similar between isolated ACI (3.0%) and ACI + osteotomy (4.5%) groups and OCA (2.5%) and OCA + osteotomy (3.3%) groups. Payments were significantly higher in the osteotomy groups at day of surgery and 9 months compared to isolated ACI or OCA, but costs were similar by 2 years postoperatively. Conclusions Concomitant osteotomy at the time of index ACI or OCA procedure significantly reduces the risk of reoperation with a similar rate of complications and similar overall costs compared with isolated ACI or OCA.

scholarly journals High rates of relapse in adolescents crack users after inpatient clinic discharge

2016 ◽  
Vol 65 (3) ◽  
pp. 215-222
Author(s):  
Rosemeri Siqueira Pedroso ◽  
Luciano Santos Pinto Guimarães ◽  
Luciana Bohrer Zanetello ◽  
Veralice Maria Gonçalves ◽  
Ronaldo Lopes-Rosa ◽  
...  
Keyword(s):  
Contingency Management ◽  
Cost Benefit ◽  
Structured Interview ◽  
Therapeutic Modality ◽  
Behavioral Strategies ◽  
Crack Use ◽  
Sociodemographic Profile ◽  
The Cost ◽  
Crack Users

ABSTRACT Objective The objective of the present study was to evaluate 88 adolescent crack users referred to hospitalization and to follow them up after discharge to investigate relapse and factors associated with treatment. Methods Cohort (30 and 90 days after discharge) from a psychiatric hospital and a rehab clinic for treatment for chemical dependency in Porto Alegre between 2011 and 2012. Instruments: Semi-structured interview, conducted to evaluate the sociodemographic profile of the sample and describe the pattern of psychoactive substance use; Crack Use Relapse Scale/CURS; Questionnaire Tracking Users to Crack/QTUC; K-SADS-PL. Results In the first follow-up period (30 days after discharge), 65.9% of participants had relapsed. In the second follow-up period (90 days after discharge), 86.4% of participants had relapsed. Conclusion This is one of the first studies that show the extremely high prevalence of early relapse in adolescent crack users after discharge, questioning the cost/benefit of inpatient treatment for this population. Moreover, these results corroborate studies which suggested, young psychostimulants users might need tailored intensive outpatient treatment with contingency management and other behavioral strategies, in order to increase compliance and reduce drug or crime relapse, but this specific therapeutic modality is still scarce and must be developed in Brazil.

Is Acupuncture for Pain Relief in General Practice Cost-Effective?

1999 ◽  
Vol 17 (2) ◽  
pp. 97-100 ◽  
Author(s):  
Steven Lindall
Keyword(s):  
General Practice ◽  
Pain Relief ◽  
Acupuncture Treatment ◽  
Cost Effective ◽  
Total Saving ◽  
Hospital Outpatient ◽  
The Cost ◽  
Lost To Follow Up ◽  
Practice Cost

Sixty-five selected patients with pain, mainly of musculo-skeletal origin, were offered treatment by a qualified medical acupuncturist in his general practice surgery as an alternative to hospital outpatient referral. The patients assessed their own outcomes on a digital scale: there were 46 successful treatments and 14 failures, with 5 being lost to follow up. The cost of acupuncture treatment was compared to that of the referral that would have been made if acupuncture had not been offered. The acupuncture was found to have cost £10,943 against a minimum likely cost for hospital referrals of £26,783. A minimum total saving for all 60 patients of £13,916 was determined, giving an average saving per patient of £232. Additional hidden savings through avoiding further hospital procedures and expenditure on medication were not taken into account. It is concluded that acupuncture in selected patients and when used by an appropriately qualified practitioner appears to be a cost-effective therapy for use in general practice, reducing the need for more expensive hospital referrals.

The Rod Force Law Analysis of 600MW Air Cooling Tower

2014 ◽  
Vol 945-949 ◽  
pp. 1135-1138
Author(s):  
Tao Liang ◽  
Chun Ling Meng ◽  
Yang Li ◽  
Xiu Hua Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Axial Force ◽  
Optimization Design ◽  
Cooling Tower ◽  
Air Cooling ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
The Cost

The finite element analysis of large air cooling tower was carried out using ABAQUS. On the basis of strength above,8 types of the axial force are analyzed and summarized, find valuable rules, and put forward the further optimization design. So that it can satisfy the strength and stability of air cooling tower, the structure is more reasonable, reduce weight, reduce the cost.

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