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George I.n. Rozvany - One of the best experts on this subject based on the ideXlab platform.

  • extended exact solutions for least weight truss layouts part i cantilever with a horizontal axis of symmetry
    International Journal of Mechanical Sciences, 1994
    Co-Authors: T Lewinski, M Zhou, George I.n. Rozvany
    Abstract:

    Abstract The paper deals with new applications of Michell's theory for determining the layout of least-weight trusses under a single load condition and the same Permissible Stress for all bars. Considering cantilever trusses with a horizontal axis of symmetry, the optimal layout was derived in a closed analytical form by A. S. L. Chan and H. S. Y. Chan for a limited length: height ratio. Solutions beyond the above ratio are investigated in this paper. The results will be extended to non-symmetric cantilever trusses in Part II of this study. In both parts, a novel method is used for deriving adjoint displacements. The results are also confirmed by comparisons with discretized solutions for trusses and perforated plates.

  • Extended exact solutions for least-weight truss layouts—Part I: Cantilever with a horizontal axis of symmetry
    International Journal of Mechanical Sciences, 1994
    Co-Authors: T Lewinski, M Zhou, George I.n. Rozvany
    Abstract:

    Abstract The paper deals with new applications of Michell's theory for determining the layout of least-weight trusses under a single load condition and the same Permissible Stress for all bars. Considering cantilever trusses with a horizontal axis of symmetry, the optimal layout was derived in a closed analytical form by A. S. L. Chan and H. S. Y. Chan for a limited length: height ratio. Solutions beyond the above ratio are investigated in this paper. The results will be extended to non-symmetric cantilever trusses in Part II of this study. In both parts, a novel method is used for deriving adjoint displacements. The results are also confirmed by comparisons with discretized solutions for trusses and perforated plates.

  • Optimal Layout of Trusses: Simple Solutions
    Shape and Layout Optimization of Structural Systems and Optimality Criteria Methods, 1992
    Co-Authors: George I.n. Rozvany, W. Gollub
    Abstract:

    As was mentioned in Chapter 2, this class of optimal layouts was pioneered around the turn of the century by an Australian scientist, A.G.M. Michell (1904). The specific cost function ψ for the considered structures is ψ = k|N|, where k = 1/σ p is a given constant, σ p is the Permissible Stress and N is the member force. The corresponding optimality criteria were given in (1) and (2) in Chapter 2. They imply that least-weight trusses in the plane must consist of the following types of optimal regions for points with non-vanishing members: (220) where N 1 and N 2 are the principal forces whilst and are the principal strains.

T Lewinski - One of the best experts on this subject based on the ideXlab platform.

  • extended exact solutions for least weight truss layouts part i cantilever with a horizontal axis of symmetry
    International Journal of Mechanical Sciences, 1994
    Co-Authors: T Lewinski, M Zhou, George I.n. Rozvany
    Abstract:

    Abstract The paper deals with new applications of Michell's theory for determining the layout of least-weight trusses under a single load condition and the same Permissible Stress for all bars. Considering cantilever trusses with a horizontal axis of symmetry, the optimal layout was derived in a closed analytical form by A. S. L. Chan and H. S. Y. Chan for a limited length: height ratio. Solutions beyond the above ratio are investigated in this paper. The results will be extended to non-symmetric cantilever trusses in Part II of this study. In both parts, a novel method is used for deriving adjoint displacements. The results are also confirmed by comparisons with discretized solutions for trusses and perforated plates.

  • Extended exact solutions for least-weight truss layouts—Part I: Cantilever with a horizontal axis of symmetry
    International Journal of Mechanical Sciences, 1994
    Co-Authors: T Lewinski, M Zhou, George I.n. Rozvany
    Abstract:

    Abstract The paper deals with new applications of Michell's theory for determining the layout of least-weight trusses under a single load condition and the same Permissible Stress for all bars. Considering cantilever trusses with a horizontal axis of symmetry, the optimal layout was derived in a closed analytical form by A. S. L. Chan and H. S. Y. Chan for a limited length: height ratio. Solutions beyond the above ratio are investigated in this paper. The results will be extended to non-symmetric cantilever trusses in Part II of this study. In both parts, a novel method is used for deriving adjoint displacements. The results are also confirmed by comparisons with discretized solutions for trusses and perforated plates.

M Zhou - One of the best experts on this subject based on the ideXlab platform.

  • extended exact solutions for least weight truss layouts part i cantilever with a horizontal axis of symmetry
    International Journal of Mechanical Sciences, 1994
    Co-Authors: T Lewinski, M Zhou, George I.n. Rozvany
    Abstract:

    Abstract The paper deals with new applications of Michell's theory for determining the layout of least-weight trusses under a single load condition and the same Permissible Stress for all bars. Considering cantilever trusses with a horizontal axis of symmetry, the optimal layout was derived in a closed analytical form by A. S. L. Chan and H. S. Y. Chan for a limited length: height ratio. Solutions beyond the above ratio are investigated in this paper. The results will be extended to non-symmetric cantilever trusses in Part II of this study. In both parts, a novel method is used for deriving adjoint displacements. The results are also confirmed by comparisons with discretized solutions for trusses and perforated plates.

  • Extended exact solutions for least-weight truss layouts—Part I: Cantilever with a horizontal axis of symmetry
    International Journal of Mechanical Sciences, 1994
    Co-Authors: T Lewinski, M Zhou, George I.n. Rozvany
    Abstract:

    Abstract The paper deals with new applications of Michell's theory for determining the layout of least-weight trusses under a single load condition and the same Permissible Stress for all bars. Considering cantilever trusses with a horizontal axis of symmetry, the optimal layout was derived in a closed analytical form by A. S. L. Chan and H. S. Y. Chan for a limited length: height ratio. Solutions beyond the above ratio are investigated in this paper. The results will be extended to non-symmetric cantilever trusses in Part II of this study. In both parts, a novel method is used for deriving adjoint displacements. The results are also confirmed by comparisons with discretized solutions for trusses and perforated plates.

Y. Zhang - One of the best experts on this subject based on the ideXlab platform.

  • mechanical properties of pultruded gfrp wf channel and angle profiles for limit state Permissible Stress design
    Composites Part B-engineering, 2018
    Co-Authors: G J Turvey, Y. Zhang
    Abstract:

    Abstract Coupon test data from five pultruded GFRP profiles is used to generate longitudinal/transverse, tensile/compressive ultimate Stresses, elastic moduli, minor/major Poisson's ratios and ultimate strains (some of which are not in the pultruders' design manuals). Characteristic ultimate Stresses/elastic moduli are compared to design manual minimum values. The former depend on profile size/shape, whereas the latter are shape-/size-independent. Limit state design Stresses are shown to be larger than Permissible Stress design Stresses. However, most of the limit state longitudinal design elastic moduli are smaller and all of the transverse design elastic moduli are larger than the Permissible Stress values.

  • Mechanical properties of pultruded GFRP WF, channel and angle profiles for limit state/Permissible Stress design
    Composites Part B: Engineering, 2018
    Co-Authors: Geoffrey Turvey, Y. Zhang
    Abstract:

    Abstract Coupon test data from five pultruded GFRP profiles is used to generate longitudinal/transverse, tensile/compressive ultimate Stresses, elastic moduli, minor/major Poisson's ratios and ultimate strains (some of which are not in the pultruders' design manuals). Characteristic ultimate Stresses/elastic moduli are compared to design manual minimum values. The former depend on profile size/shape, whereas the latter are shape-/size-independent. Limit state design Stresses are shown to be larger than Permissible Stress design Stresses. However, most of the limit state longitudinal design elastic moduli are smaller and all of the transverse design elastic moduli are larger than the Permissible Stress values.

Jing Li - One of the best experts on this subject based on the ideXlab platform.

  • thermodynamic and economic investigation of a screw expander based direct steam generation solar cascade rankine cycle system using water as thermal storage fluid
    Applied Energy, 2017
    Co-Authors: Jing Li, Pengcheng Li, Yuehong Su, Jie Ji
    Abstract:

    Solar electricity generation system (SEGS) which employs cascade steam-organic Rankine cycle (SORC) and steam screw expander (SE) is promising due to the high efficiency at moderate heat source temperature. This paper puts a special emphasis on heat storage and thermo-economic evaluation. Preferable operating temperature of the system is first clarified on the basis of SE characteristics. The temperature-dependent Permissible Stress of steam accumulator is modelled and the capital cost is investigated. Comparison between the direct steam generation (DSG) SEGS and an indirect one using thermal oil is made at a power capacity of 1MW and storage of 6.5h. The results indicate the DSG system has both thermodynamic and economic superiorities. The hot side temperature (TH) of SORC generally does not exceed 250°C to achieve an optimum solar thermal power efficiency. Given radiation of 750W/m2, the maximum efficiency (ηT,m) is 14.3% with a corresponding TH around 240°C. The material cost of pressure vessels is 2.55 million RMB. For the indirect system, the optimal TH is about 230°C and ηT,m approximates to 13.2% and the estimated oil cost is 7.92 million RMB. It is recommended to adopt steam accumulators in the SE-driven SEGS.