Friction behaviour is an important characteristic of dynamic seals. Surface texturing effective method to control the friction level without need change materials or lubricants. However, it difficult put manual prediction optimal reducing textures as a function operating conditions into practice. Therefore, in this paper, we use machine learning techniques for texture parameters optimisation. The application pneumatic piston seals serves illustrative example demonstrate and results. analyses...

The aim of the study was to examine noise exposure for operating theater staff during total knee arthroplasty (TKA) with three different robot systems. There is already evidence that TKA performed manually exceeds recommended guidelines occupational noise. Therefore, if surgical exposed it several years, development noise-inducing hearing loss (NIHL) significantly increased. To investigate robot-assisted TKA, measured average and peak sound pressure MAKO (Stryker, Kalamazoo, Michigan, United...

Abstract The ability to interact safely with the environment is known as one of major advantages soft robots (SRs). Due their low material stiffness, these continuously deformable offer inherent flexibility. These make them suitable for application that involve human-robot collaboration in industrial settings well medical such minimally invasive surgery. To date only few research groups have analyzed contact and frictional behavior robots. In fact, often oversimplified or neglected....

Abstract REFERENCE: S. Ripka, H. Lind, M. Wangenheim, J. Wallaschek, K. Wiese, and B. Wies “Investigation of Friction Mechanisms Siped Tire Tread Blocks on Snowy Icy Surfaces,” Science Technology , TSTCA, Vol. 40, No. 1, January–March 2012, pp. 1–24. ABSTRACT: Due to general safety reasons an increasing individual demand more traffic safety, winter tires have become important. This evolution results in a rising requirement the customers concerning tire performance one hand, effort industry...

This paper presents a numerical simulation of an aircraft tire in contact with rough surface using variable friction coefficient dependent on temperature and pressure. A sliding facility was used order to evaluate this dependence the coefficient. The diffusion throughout cross-section measured by means thermocouples. Both frictional heating were compared two- three- dimensional simulations. An adequate prediction could be obtained. In future simulations, wear should taken into account have...

Surface texturing is an effective method to reduce friction without the need change materials. In this study, surface textures were transferred rubber samples in form of dimples, using a novel laser (LST)—based during moulding (TDM) production process, developed within European Project MouldTex. The used experimentally determine texture-induced variations, although, due complexity manufacturing, only limited amount was available. tribological measurements hence combined with artificial...

ABSTRACT For modeling an aircraft tire using the brush model method, friction coefficient μ between rubber and asphalt should not only be described in terms of applied pressure sliding velocity/slip ratio, but also by local temperature inside contact area. Its influence cannot neglected, since it leads to significant material property changes. Therefore, investigations on different test rigs are analyzed thermal recordings infrared camera. First measurements done a high speed linear tester...

Tread wear appears as a consequence of friction, which mainly depends on surface characteristics, contact pressure, slip velocity, temperature and dissipative material properties the tread itself. The subsequent description introduces model function frictional energy rate. A post-processing well an adaptive re-meshing algorithm are implemented into finite element code in order to predict loss terms mass. geometry block models is generated by image processing tools using photographs rubber...

Abstract Within the contact zone between tire and road all normal tangential forces have to be transmitted. The tread block is only component which in direct pavement therefore of special interest. rolling process a can seen as chronology single events surface, whereas situation detail usually unknown. surface texture comprises large range wavelengths leads small area real complex conditions. Under braking acceleration procedures sliding friction occurs within footprint especially at...

ABSTRACT A detailed understanding of effects occurring in the contact patch between tire tread and snow surface is needed to maximize grip winter conditions. The main focus this study quantifying milling individual block elements during sliding. Tests are carried out using high-speed linear friction tester (HiLiTe), located at Institute Dynamics Vibration Research Leibniz University Hannover, Germany. Test tracks prepared artificially produced snow. To solely investigate exclude material...

ABSTRACT Not only in the automotive sector, but also field of aircraft tires, topic abrasion is great importance. The tire manufacturers provide criteria for permissible degree wear. If these limits are exceeded, must be replaced or retreaded. By this time, should withstand as many takeoff and landing cycles possible. Abrasion models help to predict wear behavior preflight modeling. At Institute Dynamics Vibration Research, quasi-steady tests performed using tread block samples from an tire....

Technical applications with unilateral contact are often modeled as multiple coupled discrete mass points. The transition between states is described by transforming the formulation into a linear complementary problem (LCP). In case of compliant materials such rubber, LCP can be simplified so that no algorithm needed to solve equation system. Thus, computational effort reduced considerably. this paper windscreen wiper lip simple mechanical system consists masses which springs and dampers....

Abstract Winter tires earn more and attention due to the increasing awareness of safety aspects also in emerging markets like Russia China. Besides rubber compound siped geometry tread blocks is essential. The mechanical behaviour sliding lamellas modeled with beam theory Euler–Bernoulli. In this contribution block model will be experimentally verified first simulation results presented. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Abstract In many fields of technical and non–technical applications occur friction induced vibrations. If undesired, which applies to most these oscillations, different methods exist for their avoidance or at least reduction. A recently investigated method, the systematic treatment contacting surfaces by techniques is shown in this work with example a pneumatic seal. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

ABSTRACT The aircraft tire is the link between and runway transmits forces moments within contact area. During ground maneuvers, exposed to a wide range of operating conditions. tires support weight aircraft, they ensure safe rolling during taxiing, transfer required takeoff landing. Temperature development these maneuvers great importance because temperature can affect both material stiffness friction behavior as well wear characteristics. Heat generated inside due energy dissipation caused...

Soft material robotic systems offer inherent safety and flexibility due to their low stiffness. Therefore, soft robots are prone operate in unknown environments fulfill tasks that involve even exploit contact with the environment. Moving application of robots, incorporating validated models modeling frameworks can be crucial for simulation in, e.g. design optimization, motion planning or control. Cosserat rod have proven themselves not only accurate but also computationally efficient slender...

ABSTRACT To develop applicable friction and wear models on tire scale, reliable test data are required. Consequently, tests block level requested because the distribution of contact pressure as well slip velocity is nearly homogeneous at surface sliding rubber block. However, mechanism energy intensity levels blocks rolling wheels or tires differ significantly. linking both frictional abrasion required; thus, a model for material introduced to consider deformation sliding. The input...

The focus of this work is the friction reciprocating seals. In most cases counter face sealing contacts metallic. machining process these parts results in an upper boundary surface roughness wavelength range micro meter. Usually a lubricant used to reduce and wear thus increase lifetime. Different mechanisms contribute systems: Viscous resulting from shear lubricant, hysteresis caused by internal damping when rubber material excited while sliding on rough counterpart. Adhesion considered as...

In the tire-road contact friction depends on several influencing variables (e.g. surface texture, real area, sliding velocity, normal pressure, temperature, tread block geometry, compound and existence of a lubrication film). A multi-scale model for prediction area frictional behaviour rubber rigid rough surfaces at different length scales is presented. Within this publication approach checked regarding convergence. By means parameters like texture will be investigated.

The mechanical properties of rubber materials are strongly dependent on temperature. This also affects the friction elements like tires or sealings. Therefore, temperature distribution in a contact is investigated more closely this publication. At first steady-state sliding examined experimentally and theoretically. These considerations extended by transient processes step velocity normal load non-uniform surface pressure distribution. rolling wheel for variation load, angular slippage. performed