Optimal damping layout in a shell structure using topology optimization

Vibration and damping analysis of thick sandwich cylindrical shells with a viscoelastic core under arbitrary boundary conditions

Study on vibration damping of composite sandwich cylindrical shell with pyramidal truss-like cores

Linear and nonlinear vibration analysis of sandwich cylindrical shell with constrained viscoelastic core layer

Vibration and damping analysis of cylindrical shell treated with viscoelastic damping materials under elastic boundary conditions via a unified Rayleigh-Ritz method

Vibration damping of cylindrical shells using strain-energy-based distribution of an add-on viscoelastic treatment

A fuel rail assembly for supplying pressurized fuel to at least one fuel injector of an engine includes a hollow fuel rail extending along a fuel rail axis. The fuel rail includes an inlet for introducing the pressurized fuel into the fuel rail and at least one outlet for dispensing the pressurized fuel from the fuel rail. The fuel rail assembly also includes a bracket for attaching the fuel rail assembly to the engine. The bracket includes a fuel rail portion defining a first passage extending therethrough in the same direction as the fuel rail axis for receiving the fuel rail therewithin. The bracket also includes a mounting portion adjacent to the fuel rail portion and defining a second passage extending therethrough in the same direction as the fuel rail axis. The mounting portion is configured to receive a fastener for securing the fuel rail assembly to the engine.

Fuel rail assembly with bracket and isolator for mounting

In hybrid electric vehicles (HEVs) and full electric vehicles (EVs), efficient electrical power management with proper supply of power at the required voltage levels is essential. A DC (Direct Current)-DC converter is one of the key electrical units in a HEV/EV. The DC-DC converter dealt in the present work is intended to create the DC voltages necessary to power the accessories. The electronic circuit in this DC-DC converter consists of high power devices like Metal-Oxide Semiconductor Field-Effect Transistors (MOSFETs), inductors, transformers, etc. mounted on a printed circuit board (PCB). The DC-DC converter interacts with a high voltage battery pack and supplies a low voltage power to the accessory battery. Due to this power handling operation, the devices in the convertor experience high temperatures. The temperature rise of the devices beyond the permissible limits could be detrimental to an efficient and safe operation of the converter. This paper deals with a robust and optimal thermal design of an air-cooled DC-DC Converter in order that the temperature (primary design parameter) of each of the devices is at a minimum and below the corresponding permissible limit of the device. Additionally, a design feasibility study is conducted for optimum material utilization and packaging space. The Robust Engineering (RE) experiments are conducted using Computer Aided Engineering (CAE)-virtual simulation based on a non-linear finite volume method. The paper also provides an understanding of the relative magnitude of the influence of various design features upon the temperature of each of the devices. The study helps to realize the benefits of using a RE design approach in conjunction with a reliable CAE

Robust Thermal Design of a DC-DC Converter in an Electric Vehicle

A fuel rail assembly includes a fuel rail having a main conduit with a main fuel passage and a distribution conduit extending away from the main conduit and having a distribution passage extending therethrough which is in fluid communication with the main fuel passage, the distribution conduit having a distribution conduit primary threaded section, a distribution conduit secondary threaded section, and a distribution conduit sealing surface located axially between the distribution conduit primary threaded section and the distribution conduit secondary threaded section. A primary sealing nut threadably engages the distribution conduit secondary threaded section and a secondary sealing nut threadably engages the distribution conduit secondary threaded section. A sealing ring is located within a counterbore of the primary sealing nut or the secondary sealing nut such that the sealing ring circumferentially and sealingly surrounds the distribution conduit sealing surface and a sealing engages a sealing surface of the counterbore.

Fuel rail assembly providing connection to a fuel injector

A fuel system includes a fuel injector having an inlet conduit which extends along an inlet conduit axis and has an inlet conduit shoulder which is travers to the inlet conduit axis. A fuel distribution conduit supplies fuel to the fuel injector, extends along a fuel distribution conduit axis, and has external threads which threadably engage internal threads of a connection nut. A retention member is a segment of an annulus and includes a central passage extending axially therethrough and external threads which threadably engage the internal threads of the connection nut. The retention member is terminated in a direction circumferentially about the fuel distribution conduit axis by first and second end surfaces which together form a retention member slot therebetween sized to permit the inlet conduit to pass therethrough in a direction perpendicular to the fuel distribution conduit axis.

Masti Ravish S

Papers

Vibration damping of cylindrical shells using strain-energy-based distribution of an add-on viscoelastic treatment

Fuel rail assembly with bracket and isolator for mounting

Robust Thermal Design of a DC-DC Converter in an Electric Vehicle

Fuel rail assembly providing connection to a fuel injector

Fuel system having a connection between a fuel injector and a fuel distribution conduit