The steady-state response of multidegree-of-freedom systems with a spatially localized nonlinearity

This thesis is concerned with the dynamic response of a General multidegree-of-freedom linear system with a one dimensional nonlinear constraint attached between two points. The nonlinear constraint is assumed to consist of rate-independent conservative and hysteretic nonlinearities and may contain a viscous dissipation element. The dynamic equations for general spatial and temporal load distributions are derived for both continuous and discrete systems. The method of equivalent linearization is used to develop equations which govern the approximate steady-state response to generally distributed loads with harmonic time dependence.

The qualitative response behavior of a class of undamped chainlike structures with a nonlinear terminal constraint is investigated. It is shown that the hardening or softening behavior of every resonance curve is similar and is determined by the properties of the constraint. Also examined are the number and location of resonance curves, the boundedness of the forced response, the loci of response extrema, and other characteristics of the response. Particular consideration is given to the dependence of the response characteristics on the properties of the linear system, the nonlinear constraint, and the load distribution.

Numerical examples of the approximate steady-state response of three structural systems are presented. These examples illustrate the application of the formulation and qualitative theory. It is shown that disconnected response curves and response curves which cross are obtained for base excitation of a uniform shear beam with a cubic spring foundation. Disconnected response curves are also obtained for the steady-state response to a concentrated load of a chainlike structure with a hardening hysteretic constraint. The accuracy of the approximate response curves is investigated.

The Feasibility of Enhancing Red Sea Urchin, Strongylocentrotus iranciscanus, Stocks in California: An Analysis of the Options

The California fishery for red sea urchins, Strongylocentrotus franciscanus, has undergone explosive growth in recent years and is approaching full exploitation. Thus, there is considerable interest in enhancing stocks to maintain a high rate of landings. Fishable stocks of red sea urchins in different areas appear to be limited at three stages in their life history: By the availability of larvae, by the survival of newly settled to mid-sized animals, and by the food available to support growth and reproduction of larger animals. Here I review other efforts, notably the extensive Japanese work, to enhance fishable stocks of benthic marine invertebrates, and consider the potential options for red sea urchins at different points of limitation. These include collecting or culturing seed for outplanting, physical habitat improvement measures, improving the food supply, and conservation measures to protect existing stocks until alternate methods are proven and in place. The options are compared in terms of biological feasibility, capital and labor requirements, and potential implications for change in the structure of the fishing industry.

The eight hours day for wage earning women: United States Supreme Court upholds the California law : List of eight hours laws

National Consumers' League.

Index of all reports issued by Bureaus of Labor Statistics in the United States, prior to March 1, 1902

prepared under the direction of Carroll D. Wright ; for the use of the United States Department of Labor.

Odometer tampering violations analysis: manual for administration of state odometer enforcement programs. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

State administration of bilingual education-- sí o no? : A report /

"Written by Ramona L. Godoy."

California State employment : a report /

"July 1980."

Jobs in the private sector : use of labor market information : a user's guide with detailed appendices /

"October 1980."

Industrial directory of New York State.

Description based on: 1940.

Directory of public employee organizations in New York State.

Mode of access: Internet.

Handbook for estimation of labor supply by use of a community survey.

Title from cover.

The labor market ... reviewed by the Bureau of Statistics & Information.

Mode of access: Internet.

Report of the Bureau of Children's Aid, State Dept. of Finance

Mode of access: Internet.

Annual report of the State Board of Conciliation and Arbitration ...

Later years also issued as part of the Annual report of the Department of Labor and Industries (P.D. 104).

Annual report of the State Board of Arbitration.

Reports also called 2nd-7th.