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The major difficulty of a time-dependent force-res-ponse measurement during an impact event, by means of high-speed load cells, is the existence of parasitic reson-ances.7 The experimental stand exhibits an eigen dyna-mic response and in consequence, the final measured dynamic response is coupled with the stand-structure one.
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Lee et al. present the mechanism of high-speed impact performance of bioinspired microstructural designs using high-throughput computational simulations. Results show …
In connection with this, the development of a sim-plified theoretical approaches to wide variety of the problems of high-speed interaction of bodies is still urgent. At present, the region of high-speed impact has drawn the attention of researchers. This interest is stimulated by the development of space and military technologies.
At each instant during impact the interface or contact pressure has a resultant force of action or reaction that act in opposite directions on the two colliding bodies and thereby …
Semantic Scholar extracted view of "Numerical investigation of the high-velocity impact performance of body armor panels" by Jun Lin et al.
By means of high-speed cameras, a full-field deformation and strain measurement under high-speed impact is presented based on digital image correlation and binocular stereo …
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Cong et al. [6] considered the coupling effect of the rotor and introduced the alternate rotor load into the impulse train model to propose a new model. Recently, Yi Qin et al. [7] proposed a high-speed rolling bearing model with a localized surface defect, the high-speed effects and DOFs of the movable components were considered.
Abstract. The varying speed impact of wedge bodies on a water surface is studied numerically and theoretically to provide a fast and accurate prediction of the pressure on the wedge surface and the motion of wedge bodies during the free impact, which can be a two-dimensional (2D) model for the strip theory or 2D + t strategy. The …
Apart from wind loads, the transient air pressure wave induced by two high-speed trains passing by each other is significantly adverse to the car body and side windows, which will sweep through car bodies, produce a large impact vibration and harm the operation safety and comfort of the train.
These 'movies' of proteins in action are revealing the hidden biology of cells. A burgeoning technique called time-resolved cryo-EM is granting insights into the tiny motors and devices that ...
We present a simple hydrodynamical model for the high-speed impact of slender bodies into frictional geomaterials such as soils and clays. We model these materials as non-smooth, complex fluids. Our model predicts the evolution of the impactor's speed and the final penetration depth given the initial impact speed, and the material …
This paper focuses on the bogie-carbody nonlinear dynamic interaction of a Shinkansen high-speed rail vehicle. The Euler-Bernoulli beam model is used to simulate vertical elastic vibrations of the carbody. As a novelty, the traction rod that connects the bogie frame and the carbody is considered a nonlinear element. The equivalent …
Abstract. This paper takes a new look at how the aerodynamic interactions of multiple bodies in high-speed flow affect their motion behaviors. The influence of the body …
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Ultra-high performance concrete is characterized by its high strength and high toughness, and ceramsite concrete can absorb energy and function as a buffer. Based on the mechanical properties of both, the two kinds of concrete materials are combined in the spatial structure, and three structural models, namely, gradient structure group …
Therefore, so-called high-speed impact cutting (HSIC) is used to achieve the required cut surface qualities. A new machine concept consisting of linear motors and an impact mass is presented to ...
HITS-X Series. With the increasing demand for safety and reliability, evaluation of the dynamic strength (impact properties) of materials and parts is becoming more and more important. This machine can obtain data, such as the maximum test force, energy, and displacement, up to a maximum velocity of 72 km/h (20 m/s).
The fluid dynamics of liquid droplet impact on surfaces hold significant relevance to various industrial applications. However, high impact velocities introduce compressible effects, leading to material erosion. A gap in understanding and modeling these effects has motivated this study. We simulated droplet impacts on solid surfaces …
This chapter starts with the dynamics of two rigid bodies with one contact/impact point, including the local kinematics which allow one to define the unilateral constraint between the two bodies. Rigid body impact …
This article will shed some light on the various types of movements in the human body. They will be grouped in pairs of 'antagonistic actions' (actions that oppose one another), just like certain muscle groups.
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Learn how to calculate the rotational kinetic energy and the moment of inertia of a rigid body with OpenStax, a free and high-quality textbook provider.
Semantic Scholar extracted view of "Numerical study of impact force and ricochet behavior of high speed water-entry bodies" by Man-Sung Park et al.
Short fibres would lessen the costs to generate the high forces needed, yet long fibres reduce the sarcomere shortening velocity for a given shortening speed and hence reduce the costs associated with performing work. A third constraint is that large muscle volumes increase limb inertia and body mass.
When a multi-body system is subjected to impact, its crashworthiness performance depends not only on the energy absorption characteristic but also on the mass …
Among the various approaches in dynamic structural biology, high-speed atomic force microscopy (HS-AFM) is unique in the ability to film individual molecules in dynamic action, although only topographical information is acquirable. This review provides a guide to the use of HS-AFM for biomolecular imaging and showcases several …
In the musculoskeletal system, the muscular and skeletal systems work together to support and move the body. The bones of the skeletal system serve to protect the body's organs, support the weight of the body, and give the body shape. The muscles of the muscular system attach to these bones, pulling on them to allow for movement of the body.
Semantic Scholar extracted view of "High-Speed Impact Action on Movable Bodies" by Svetlana Polukoško et al.
In this paper action of high-speed impact on the target, which could rotate, is examined. Target is designed for using as conduct-of-fire trainer; its screen is fired by light bullet …
A high-speed interruption protection relay uses the technology of high-speed sampling, digital signal processing, and computer algorithms in order to implement the apparatus which can enable a protection relay total action time to be less than 3 ms.
