Hysteresis Characteristic Model of Suspension for Vehicle Dynamics Simulation

2013 ◽  
Vol 706-708 ◽  
pp. 1385-1388
Author(s):  
Hsin Guan ◽  
Rong He ◽  
Rui Guo

Suspension model can be divided into vertical hysteresis characteristic model and suspension guide-mechanism model according to its function. The relationship of the force and displacement is described in the existing vertical characteristic model, which does not consider the impact of the frequency. In the existing guide-mechanism model, the centerline of suspension K&C experimental data is used as the basis of the spindle position and attitude correction, without considering the hysteresis area. The problems above will affect simulation accuracy of vehicle dynamic. In this paper, hysteresis characteristic model of suspension is built. The vertical hysteresis model consists of spring, Maxwell element and Dehl friction unit. While in guide-mechanism model, if the hysteresis region is not obvious, considering the asymmetry, upper and lower borderlines are used to instead the centerline, and if the hysteresis characteristic is obvious, the Fancher formula is used to describe hysteresis range. Results showed out that the model has a high accuracy and is able to accurately describe hysteresis characteristics of suspension by comparison with the suspension system K&C experimental results.

2013 ◽  
Vol 706-708 ◽  
pp. 1520-1523
Author(s):  
Hsin Guan ◽  
Rong He ◽  
Rui Guo

In the existing wheel model, rim and rigid ring are connected with six direction spring and damper, which represent the elasticity of wheel carcass. In this paper, based on the ASCL original wheel model, the six direction hysteresis characteristic model of wheel carcass is built. In the vertical direction, Berg model which is widely used to describe the hysteresis characteristics of the rubber bushing is built to describe the hysteresis of wheel carcass, whose dynamic parameters are more consistent with the actual situation. In the other direction, the Fancher formula is used to describe the relationship of the force and displacement. Results showed out that the model has a high accuracy and is able to accurately describe hysteresis characteristics of wheel carcass by comparison with the suspension system K&C experimental results.


2013 ◽  
Vol 572 ◽  
pp. 476-479
Author(s):  
Sheng Long Li ◽  
Liang Gao ◽  
He Zhang

Friction plate, the key part of the planetary transmission, is often damaged by the impact of the geer mesh. And the reason of the impact damage is not known yet. The backlash of the friction plate is crucial to the impact damage, thus the relationship of the backlash and impact damage is dissgussed in this study.The mathematic model is built up to calculate the impact force and the ADAMS dynamics simulation software is used to check the result of the mathematic model and get the dynamic characteristics of the impact force and provide the basis for the optimizing of backlash. Keywords: friction plate;impact of geer mesh;geer backlash;mathematic model


2020 ◽  
Vol 29 (4) ◽  
pp. 2097-2108
Author(s):  
Robyn L. Croft ◽  
Courtney T. Byrd

Purpose The purpose of this study was to identify levels of self-compassion in adults who do and do not stutter and to determine whether self-compassion predicts the impact of stuttering on quality of life in adults who stutter. Method Participants included 140 adults who do and do not stutter matched for age and gender. All participants completed the Self-Compassion Scale. Adults who stutter also completed the Overall Assessment of the Speaker's Experience of Stuttering. Data were analyzed for self-compassion differences between and within adults who do and do not stutter and to predict self-compassion on quality of life in adults who stutter. Results Adults who do and do not stutter exhibited no significant differences in total self-compassion, regardless of participant gender. A simple linear regression of the total self-compassion score and total Overall Assessment of the Speaker's Experience of Stuttering score showed a significant, negative linear relationship of self-compassion predicting the impact of stuttering on quality of life. Conclusions Data suggest that higher levels of self-kindness, mindfulness, and social connectedness (i.e., self-compassion) are related to reduced negative reactions to stuttering, an increased participation in daily communication situations, and an improved overall quality of life. Future research should replicate current findings and identify moderators of the self-compassion–quality of life relationship.


2010 ◽  
Vol 20 (1) ◽  
pp. 3-8
Author(s):  
Dee Adams Nikjeh

Abstract Administrators and supervisors face daily challenges over issues such as program funding, service fees, correct coding procedures, and the ever-changing healthcare regulations. Receiving equitable reimbursement for speech-language pathology and audiology services necessitates an understanding of federal coding and reimbursement systems. This tutorial provides information pertaining to two major healthcare coding systems and explains the relationship of these systems to clinical documentation, the Medicare Physician Fee Schedule and equitable reimbursement. An explanation of coding edits and coding modifiers is provided for use in those occasional atypical situations when the standard use of procedural coding may not be appropriate. Also included in this tutorial is a brief discussion of the impact that the Medicare Improvements for Patients and Providers Act of 2008 (HR 6331 Medicare Improvements for Patients and Providers Act [MIPPA], 2008) has had on the valuation of speech-language pathology procedure codes.


2008 ◽  
Vol 16 (3) ◽  
pp. 112-115 ◽  
Author(s):  
Stephan Bongard ◽  
Volker Hodapp ◽  
Sonja Rohrmann

Abstract. Our unit investigates the relationship of emotional processes (experience, expression, and coping), their physiological correlates and possible health outcomes. We study domain specific anger expression behavior and associated cardio-vascular loads and found e.g. that particularly an open anger expression at work is associated with greater blood pressure. Furthermore, we demonstrated that women may be predisposed for the development of certain mental disorders because of their higher disgust sensitivity. We also pointed out that the suppression of negative emotions leads to increased physiological stress responses which results in a higher risk for cardiovascular diseases. We could show that relaxation as well as music activity like singing in a choir causes increases in the local immune parameter immunoglobuline A. Finally, we are investigating connections between migrants’ strategy of acculturation and health and found e.g. elevated cardiovascular stress responses in migrants when they where highly adapted to the German culture.


Author(s):  
Richard A. Best

This article discusses the dilemma of the defense intelligence. It discusses the interweaving yet complicated relationship of the Department of Defense (DOD) and the Office of Director of National Intelligence (ODNI). Immersed in a divided and a “stovepiped” culture, the member agencies of the intelligence community lacked coordination and collaboration. In this article, the nature of the three agencies of the DOD: the National Security Agency (NSA), the National Reconnaissance Office (NRO), and the National Geospatial-Intelligence Agency (NGA) are discussed. The evolution of coordination among the intelligence community agencies and the impact of 9/11 on the cooperation and collaboration between the agencies are also discussed including the era of the Director of National Intelligence (DNI) and the challenges posed by the future space surveillance.


2019 ◽  
Vol 11 (02) ◽  
pp. 1950019 ◽  
Author(s):  
Lin Gan ◽  
He Zhang ◽  
Cheng Zhou ◽  
Lin Liu

Rotating scanning motor is the important component of synchronous scanning laser fuze. High emission overload environment in the conventional ammunition has a serious impact on the reliability of the motor. Based on the theory that the buffer pad can attenuate the impact stress wave, a new motor buffering Isolation Method is proposed. The dynamical model of the new buffering isolation structure is established by ANSYS infinite element analysis software to do the nonlinear impact dynamics simulation of rotating scanning motor. The effectiveness of Buffering Isolation using different materials is comparatively analyzed. Finally, the Macht hammer impact experiment is done, the results show that in the experience of the 70,000[Formula: see text]g impact acceleration, the new buffering Isolation method can reduce the impact load about 15 times, which can effectively alleviate the plastic deformation of rotational scanning motor and improve the reliability of synchronization scanning system. A new method and theoretical basis of anti-high overload research for Laser Fuze is presented.


2020 ◽  
Vol 20 (2) ◽  
pp. 174-188
Author(s):  
Rómulo Jacobo González-garcía ◽  
Paloma Escamilla-Fajardo ◽  
Samuel López-Carril ◽  
Juan Nuñez-Pomar

El sector del turismo deportivo recibe cada vez una mayor atención por parte de los distintos agentes sociales, teniendo un alto impacto en distintas esferas de la sociedad. El turismo no sólo afecta a las actitudes de los residentes hacia su desarrollo, sino también a su calidad de vida en general. Una vez que una comunidad o población se convierte en un destino turístico, la calidad de vida de los residentes locales se ve afectada por el desarrollo del mismo. Por consiguiente, es relevante conocer cuáles son las percepciones de los residentes respecto al impacto que causa el turismo deportivo. Por ello, el objetivo del presente estudio es analizar las percepciones de los residentes de Gran Canaria hacia los efectos del turismo deportivo, en ámbitos como su impacto, la calidad de vida y el apoyo al sector. Los resultados del estudio indican que, a mayores niveles de percepción positivos de los residentes sobre los impactos sociales, culturales, ambientales y económicos, hay un mayor apoyo hacia el desarrollo del turismo. Por otra parte, también se produce un efecto mediador significativo de la variable calidad de vida de los residentes, entre la relación de impactos percibidos y el apoyo al desarrollo del turismo activo y deportivo en Gran Canaria. Estos resultados posibilitan un mejor entendimiento de la perspectiva que los residentes tienen hacía el sector turístico deportivo, algo que puede ayudar a orientar futuras decisiones sobre la práctica, desarrollo y planificación del turismo deportivo. The sports tourism sector is receiving increasing attention from different social actors, having a high impact on different spheres of society. Tourism not only affects residents' attitudes towards their development, but also their quality of life in general. Once a community or population becomes a tourist destination, the quality of life of local residents is affected by its development. It is therefore important to know what residents' perceptions are of the impact of sports tourism. Therefore, the aim of this study is to analyse the perceptions of the residents of Gran Canaria towards the effects of sports tourism, in areas such as its impact, quality of life and support for the sector. The results of the study indicate that, at higher levels of positive perception by residents of the social, cultural, environmental and economic impacts, there is greater support for the development of tourism. On the other hand, there is also a significant mediating effect of the variable quality of life of the residents, between the relationship of perceived impacts and the support for the development of active and sports tourism in Gran Canaria. These results make it possible to better understand the perspective that residents have towards the sports tourism sector, something that can help guide future decisions on the practice, development and planning of sports tourism. O sector do turismo desportivo está a receber cada vez mais atenção por parte de diferentes actores sociais, tendo um elevado impacto em diferentes esferas da sociedade. O turismo não afecta apenas as atitudes dos residentes em relação ao seu desenvolvimento, mas também a sua qualidade de vida em geral. Uma vez que uma comunidade ou população se torna um destino turístico, a qualidade de vida dos residentes locais é afectada pelo seu desenvolvimento. Por conseguinte, é importante conhecer a percepção que os residentes têm do impacto do turismo desportivo. Portanto, o objectivo deste estudo é analisar as percepções dos residentes da Gran Canária sobre os efeitos do turismo desportivo, em áreas como o seu impacto, qualidade de vida e apoio ao sector. Os resultados do estudo indicam que, em níveis mais elevados de percepção positiva dos residentes sobre os impactos sociais, culturais, ambientais e econômicos, há maior apoio para o desenvolvimento do turismo. Por outro lado, existe também um efeito mediador significativo da variável qualidade de vida dos residentes, entre a relação de impactos percebidos e o apoio ao desenvolvimento do turismo ativo e desportivo na Gran Canária. Estes resultados permitem compreender melhor a perspectiva que os residentes têm em relação ao sector do turismo desportivo, algo que pode ajudar a orientar futuras decisões sobre a prática, desenvolvimento e planeamento do turismo desportivo. Il settore del turismo sportivo sta ricevendo un'attenzione crescente da parte di diversi attori sociali, con un forte impatto sulle diverse sfere della società. Il turismo influenza non solo l'atteggiamento dei residenti nei confronti del loro sviluppo, ma anche la loro qualità di vita in generale. Una volta che una comunità o una popolazione diventa una destinazione turistica, la qualità della vita dei residenti locali è influenzata dal suo sviluppo. È quindi importante sapere quali sono le percezioni dei residenti sull'impatto del turismo sportivo. Pertanto, l'obiettivo di questo studio è quello di analizzare le percezioni degli abitanti di Gran Canaria nei confronti degli effetti del turismo sportivo, in settori quali l'impatto, la qualità della vita e il sostegno al settore. I risultati dello studio indicano che, a livelli più elevati di percezione positiva da parte dei residenti degli impatti sociali, culturali, ambientali ed economici, vi è un maggiore sostegno allo sviluppo del turismo. D'altra parte, c'è anche un significativo effetto mediatore della variabile qualità della vita dei residenti, tra la relazione degli impatti percepiti e il sostegno allo sviluppo del turismo attivo e sportivo a Gran Canaria. Questi risultati permettono di comprendere meglio la prospettiva che i residenti hanno nei confronti del settore del turismo sportivo, cosa che può aiutare a guidare le future decisioni sulla pratica, lo sviluppo e la pianificazione del turismo sportivo.


Nanomaterials ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 64 ◽  
Author(s):  
Qin Wang ◽  
Hui Xie ◽  
Zhiming Hu ◽  
Chao Liu

In this study, molecular dynamics simulations were carried out to study the coupling effect of electric field strength and surface wettability on the condensation process of water vapor. Our results show that an electric field can rotate water molecules upward and restrict condensation. Formed clusters are stretched to become columns above the threshold strength of the field, causing the condensation rate to drop quickly. The enhancement of surface attraction force boosts the rearrangement of water molecules adjacent to the surface and exaggerates the threshold value for shape transformation. In addition, the contact area between clusters and the surface increases with increasing amounts of surface attraction force, which raises the condensation efficiency. Thus, the condensation rate of water vapor on a surface under an electric field is determined by competition between intermolecular forces from the electric field and the surface.


2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Ka Chun Chong ◽  
Hong Fung ◽  
Carrie Ho Kwan Yam ◽  
Patsy Yuen Kwan Chau ◽  
Tsz Yu Chow ◽  
...  

Abstract Background The elderly healthcare voucher (EHCV) scheme is expected to lead to an increase in the number of elderly people selecting private primary healthcare services and reduce reliance on the public sector in Hong Kong. However, studies thus far have reported that this scheme has not received satisfactory responses. In this study, we examined changes in the ratio of visits between public and private doctors in primary care (to measure reliance on the public sector) for different strategic scenarios in the EHCV scheme. Methods Based on comments from an expert panel, a system dynamics model was formulated to simulate the impact of various enhanced strategies in the scheme: increasing voucher amounts, lowering the age eligibility, and designating vouchers for chronic conditions follow-up. Data and statistics for the model calibration were collected from various sources. Results The simulation results show that the current EHCV scheme is unable to reduce the utilization of public healthcare services, as well as the ratio of visits between public and private primary care among the local aging population. When comparing three different tested scenarios, even if the increase in the annual voucher amount could be maintained at the current pace or the age eligibility can be lowered to include those aged 60 years, the impact on shifts from public-to-private utilization were insignificant. The public-to-private ratio could only be marginally reduced from 0.74 to 0.64 in the first several years. Nevertheless, introducing a chronic disease-oriented voucher could result in a significant drop of 0.50 in the public-to-private ratio during the early implementation phase. However, the effect could not be maintained for an extended period. Conclusions Our findings will assist officials in improving the design of the EHCV scheme, within the wider context of promoting primary care among the elderly. We suggest that an additional chronic disease-oriented voucher can serve as an alternative strategy. The scheme must be redesigned to address more specific objectives or provide a separate voucher that promotes under-utilized healthcare services (e.g., preventive care), instead of services designed for unspecified reasons, which may lead to concerns regarding exploitation.


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