Movable Panels Research Articles

Design and Manufacturing of Scissor Lift with Movable Panels for Material Handling

A scissor lift or mechanism is a device used to extend or position a platform by mechanical means. The term “scissor” comes from the mechanic which has folding supports in crisscross “X” pattern. The extension or displacement motion is achieved by the application of force to one or more supports, resulting in an elongation of the cross pattern. The force applied to extend the scissors mechanism may by hydraulic, pneumatic or mechanical (via a lead screw or rack and pinion system). The need for the use of lift is very paramount and it runs across labs, workshops, factories to lift load, machine etc. expanded and less-efficient, the engineers may run into one or more problems when in various use. The name scissors lift originated from the ability of the device to open (expand) and close (contract) just like a scissors. Considering the need for this kind of mechanism, estimating as well the cost of expanding energy more that result gotten as well the maintenance etc. it is better to adopt this design concept to the production of the machine. The maximum lift of table is 1380mm and minimum lift of table 800mm. It is has mechanism which is completely mechanical which has lead screw and motor unit for to opening and closing of lift .Key Words: Hydraulic, Pneumatic, Mechanical, Lead screw, Rack and pinion.

Numerical modelling of braided ceramic fiber seals by using element differential method

• A multi-physical coupled model is proposed for the braided ceramic fiber seals. • The coupled fields contain the process of heat conduction, seepage and deformation. • Element differential method (EDM) is used to solve the multi-physical problems. • The material-dependent parameters in model are obtained by an inverse procedure. • Compared to FEM, EDM is more easy and efficient dealing with the coupled model. A new kind of dynamic seal with braided ceramic fibers has been designed to seal the movable panels in the scramjet engines, which are used for the propulsion of hypersonic vehicle. The braided ceramic fiber structure can provide buffer forces when the seals are subjected to the external dynamical preloads. However, it also makes the seals difficult to analyze. Up to now, the analysis of the seals still uses 1D models so that one cannot implement the coupled analysis of seals and their surrounding structures and flows. In this paper, a novel 2D and 3D mechanics-thermal-seepage coupled model is proposed to describe these seals, which provides a possibility for the aforementioned coupled analysis. Meanwhile, a strong-form numerical method, element differential method (EDM) is employed to discretize the governing equations of the coupled model due to its efficiency and robustness. Three examples are given. The first one is to invert the material-dependent parameters of three kinds of seal strips from the experimental data by Levenberg-Marquardt (LM) algorithm. Other two implement the analyses of 3D square and circular cross-section seals, respectively, which verify that EDM is more efficient than FEM in seal analysis when using the same mesh sizes.

The influence of structural parameters of acoustic panels textile fronts on their sound absorption properties

There are two main groups of acoustic dedicated products: movable panels and fixed elements (wall coverings, furniture, etc.). The typically textiles intended for this kind construction are flat fabrics and fabrics with relief. Within the framework of the work carried out, flat and relief fabrics were made, as well as jacquard wall fabrics varied in terms of raw materials and their structure. The physical parameters such thickness, surface mass, porosity and air permeability as well as acoustic properties (sound absorption coefficient) were tested. The results showed, that the values of the sound absorption coefficient depend on fabrics structure in the full frequency range. The fabrics texture also significantly shapes the acoustic properties.

Studies on unsteady mode transition of a turbine based combined cycle (TBCC) inlet with multiple movable panels

Using the overset grid method, this paper numerically studies the unsteady mode transition from the turbojet mode to the ramjet mode of a 2D TBCC inlet with multiple movable panels, for the first time. The flow field during mode transition is highly unsteady so that the steady simulation is not appropriate. Under the baseline mode transition strategy, the instability of shock waves near the throat causes the oscillation of inlet exit performance parameters. In addition, mode transitions under different turbojet back pressure are investigated, and the oscillation occurs in most cases. In order to suppress the oscillation and increase the total pressure recovery, the Unsteady Panel to Panel Optimization Method (UPPOM) is proposed to optimize the final rotation angles of movable panels. In UPPOM, the movable panels operate in a designed motion pattern, where the mode transition process is divided into two steps, namely geometry adaption and flowpath switching. After geometry adaption, the oscillation is successfully removed, and the total pressure recovery at the turbojet flowpath exit is increased by 4.24%. In the second step of optimization, a new optimization index of Weighted Total Pressure Recovery (WTPR) is employed to increase the overall performance of TBCC inlet. In the sense of the WTPR, the performance of the optimization result is increased by 5.92%.

A ‘skin’ of movable solar panels helps buildings keep their cool

A ‘skin’ of movable solar panels helps buildings keep their cool

Auditorio 400 at the ‘Museo Reina Sofia’ in Madrid: Use of variable systems for acoustic improvements

This article will describe the different acoustic problems identified in Auditorio 400 and possible solutions to these acoustic deficiencies using variable acoustic systems such as movable panels with different absorption coefficients and reflectors suspended from the ceiling. Due to the various types of events that take place in this hall, the Auditorio 400 must have proper acoustics for speech as well as music presentations and concerts, and this implies different configurations of sound sources. The auditorium has an innovative style and the solution presented in this article maintains this architectonic and aesthetic style while still improving the acoustics of the venue.

The Efficiency of Night Insulation Using Aerogel Filled Polycarbonate Panels During the Heating Season

Heat retention is important in achieving building energy efficiency during the heating season. Minimizing heat loss through a building’s glass envelope during the night is one means of heat retention. Movable insulation is one way to increase the insulation value of the building envelope and reduce heat loss towards the outdoors. This research examines the performance of aerogel filled polycarbonate movable panels in a building located on a Midwestern college campus in the USA. Onsite measurements were taken using air and surface temperature sensors to determine the effectiveness of the system. Computer simulations were run using Therm 7.2 to explore alternative design options. A cost analysis was also performed to evaluate the feasibility of utilizing movable insulation to reduce the heating bills during winter. Results showed that sealed movable insulation reduces heat loss through the glazing by 67.5%. Replacing aerogel with XPS panels reduces this percentage to 64.3%. However, it reduces the cost of the insulation material by 98%.

2718 可動パネルを用いた流路内多重連結機構のアクティブ振動制御(J20-4 流体関連の騒音と振動(4) 流体連成振動の実験解析,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

2718 可動パネルを用いた流路内多重連結機構のアクティブ振動制御(J20-4 流体関連の騒音と振動(4) 流体連成振動の実験解析,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

Bridging the Gap between Human Factors and Environmental Design: A Universal Bathroom Case Study

This user-centered design project highlights the importance of human factors in product development. It introduces two adjustable bathrooms, Movable Fixtures Bathroom and Movable Panels Bathroom, which resulted from this research and design project. Unlike existing bathrooms, which are designed primarily for independent users, these bathrooms consider the needs of the human life cycle and address dependent use and care-providing alongside independent use in the bathroom. These bathrooms reflect the social and inclusive philosophy of universal design and they have the potential to unify diverse population groups so no one user is excluded by their design.

Characteristics of Dual Reflector Antennas With Gaps Between the Panels Forming the Subreflector: MOM and PO Analysis

Beam shaping is primarily performed by shaping the main reflector. An alternative way to shaping the main reflector is to shape the subreflector in a dual reflector system where mechanically movable panels can be deployed. Panels placed on the subreflector can potentially place their own signature on the antenna pattern, a topic which is investigated in this paper. To visualize and categorize generalized panel alignments as a result of panel movements, MoM and PO/PO methods are devised and applied to 2-D geometries based on TM and TE analysis. It should be noted that the panel movements on the subreflector create gaps between the panels which would also increase antenna cross polarization levels which is not addressed here due to 2-D nature of the analysis. Consequently, this study will focus on the antenna pattern characteristics and the required number of panels in conjunction with minimizing grating/sidelobe signature left by the panels displacements with gaps in axial and lateral directions. In addition, antenna gain loss is quantified based on gap sizes between the panels. Current distribution on the reflector antenna is also studied for both TM and TE polarization and several of their key features are examined based on PO/PO and MoM analysis.

Edificio de oficinas, Gran Bretaña

This building, which houses the company's offices and subsidiaries, has three levels, built on a slope, with a garage in the basement for 80 automobiles. The interior is distributed into modular offices, with movable panels which permit a high level of flexibility and adaptation to modifications in space organization and planning. The exterior has the shape of an inverted pyramid trunk in order to neutralize the effect of the noise produced by its proximity to the London airport; this is the most outstanding point of the architectural planning.

Multi-particle RF-system for the IKO synchrocyclotron

An rf system of novel design has been installed in the synchrocyclotron of the IKO in Amsterdam. Protons, deuterons, alpha-particles, 3He ++-ions and possibly heavy ions can be accelerated since a frequency range from 10 to 24 MHz corresponding to e/ m ratio's between 1.1 and 0.4 is covered in three frequency bands. The characteristic impedance of the transmission line is varied with movable panels. Switching over to another frequency range is accomplished by connecting one or two panels to the outer conductor of the transmission line with strips. This procedure requires only ten minutes for switching from proton to deuteron operation of the machine.

Mechanical features of the r.f. system for the Berkeley 88-inch cyclotron

Four features are described: the movable-panel drive system, ceramic ball bearings, r.f. hinges, and dee construction. The r.f. tuning is accomplished by varying the volume between the dee stem and six movable panels. Power to move the panels is supplied by four hydraulic cylinders. The hydraulic drive mechanism and control system are described. A special ceramic ball bearing, with alumina balls and stainless steel races, was developed. It operates in the presence of high vacuum, r.f. field, and radiation—and without organic lubrication. Bearing construction and test results are described. The r.f. current-carrying hinges between the movable panels were designed to optimize the hinge thickness and length so that bending stresses and temperature rise were minimized. Graphs showing the relationships between hinge thickness, length bending stress, and temperature rise are presented, together with hinge configuration. The dee-stem and dee structure is approx 14 ft long and weighs 2800 lb. Support for the entire assembly is provided by cantilevering it from the rear of the resonator tank. Materials and fabrication procedure for the dee panel structure are described.

Field Sound Transmission Loss Tests of Movable Partitions for School Classrooms

Field sound transmission loss tests have been made on a number of movable partitions installed in the Chicago Laboratory School of the University of Chicago on an experimental basis. Installation and tests were supported by the Educational Facilities Laboratories, Inc., New York City, to obtain performance information. Partitions tested included individually movable panels with perimeter seals, accordion folding units, and a new, heavy curtain type incorporating woven lead thread. A 6-in. lightweight aggregate concrete block wall was included for comparison. Results indicate a range of performance from satisfactory to inferior for the purpose. The nine-frequency average of both noise reduction and sound transmission loss do not, however, rank order the units ia agreement with subjective judgment.